diff options
Diffstat (limited to 'fs/btrfs/ioctl.c')
| -rw-r--r-- | fs/btrfs/ioctl.c | 4317 |
1 files changed, 3703 insertions, 614 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 463d91b4dd3..47aceb494d1 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -40,15 +40,54 @@ #include <linux/xattr.h> #include <linux/vmalloc.h> #include <linux/slab.h> -#include "compat.h" +#include <linux/blkdev.h> +#include <linux/uuid.h> +#include <linux/btrfs.h> +#include <linux/uaccess.h> #include "ctree.h" #include "disk-io.h" #include "transaction.h" #include "btrfs_inode.h" -#include "ioctl.h" #include "print-tree.h" #include "volumes.h" #include "locking.h" +#include "inode-map.h" +#include "backref.h" +#include "rcu-string.h" +#include "send.h" +#include "dev-replace.h" +#include "props.h" +#include "sysfs.h" +#include "qgroup.h" + +#ifdef CONFIG_64BIT +/* If we have a 32-bit userspace and 64-bit kernel, then the UAPI + * structures are incorrect, as the timespec structure from userspace + * is 4 bytes too small. We define these alternatives here to teach + * the kernel about the 32-bit struct packing. + */ +struct btrfs_ioctl_timespec_32 { + __u64 sec; + __u32 nsec; +} __attribute__ ((__packed__)); + +struct btrfs_ioctl_received_subvol_args_32 { + char uuid[BTRFS_UUID_SIZE]; /* in */ + __u64 stransid; /* in */ + __u64 rtransid; /* out */ + struct btrfs_ioctl_timespec_32 stime; /* in */ + struct btrfs_ioctl_timespec_32 rtime; /* out */ + __u64 flags; /* in */ + __u64 reserved[16]; /* in */ +} __attribute__ ((__packed__)); + +#define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ + struct btrfs_ioctl_received_subvol_args_32) +#endif + + +static int btrfs_clone(struct inode *src, struct inode *inode, + u64 off, u64 olen, u64 olen_aligned, u64 destoff); /* Mask out flags that are inappropriate for the given type of inode. */ static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) @@ -80,6 +119,13 @@ static unsigned int btrfs_flags_to_ioctl(unsigned int flags) iflags |= FS_NOATIME_FL; if (flags & BTRFS_INODE_DIRSYNC) iflags |= FS_DIRSYNC_FL; + if (flags & BTRFS_INODE_NODATACOW) + iflags |= FS_NOCOW_FL; + + if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) + iflags |= FS_COMPR_FL; + else if (flags & BTRFS_INODE_NOCOMPRESS) + iflags |= FS_NOCOMP_FL; return iflags; } @@ -90,25 +136,28 @@ static unsigned int btrfs_flags_to_ioctl(unsigned int flags) void btrfs_update_iflags(struct inode *inode) { struct btrfs_inode *ip = BTRFS_I(inode); - - inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); + unsigned int new_fl = 0; if (ip->flags & BTRFS_INODE_SYNC) - inode->i_flags |= S_SYNC; + new_fl |= S_SYNC; if (ip->flags & BTRFS_INODE_IMMUTABLE) - inode->i_flags |= S_IMMUTABLE; + new_fl |= S_IMMUTABLE; if (ip->flags & BTRFS_INODE_APPEND) - inode->i_flags |= S_APPEND; + new_fl |= S_APPEND; if (ip->flags & BTRFS_INODE_NOATIME) - inode->i_flags |= S_NOATIME; + new_fl |= S_NOATIME; if (ip->flags & BTRFS_INODE_DIRSYNC) - inode->i_flags |= S_DIRSYNC; + new_fl |= S_DIRSYNC; + + set_mask_bits(&inode->i_flags, + S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC, + new_fl); } /* * Inherit flags from the parent inode. * - * Unlike extN we don't have any flags we don't want to inherit currently. + * Currently only the compression flags and the cow flags are inherited. */ void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) { @@ -119,18 +168,26 @@ void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) flags = BTRFS_I(dir)->flags; - if (S_ISREG(inode->i_mode)) - flags &= ~BTRFS_INODE_DIRSYNC; - else if (!S_ISDIR(inode->i_mode)) - flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME); + if (flags & BTRFS_INODE_NOCOMPRESS) { + BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; + BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; + } else if (flags & BTRFS_INODE_COMPRESS) { + BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; + BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; + } + + if (flags & BTRFS_INODE_NODATACOW) { + BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; + if (S_ISREG(inode->i_mode)) + BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; + } - BTRFS_I(inode)->flags = flags; btrfs_update_iflags(inode); } static int btrfs_ioctl_getflags(struct file *file, void __user *arg) { - struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); + struct btrfs_inode *ip = BTRFS_I(file_inode(file)); unsigned int flags = btrfs_flags_to_ioctl(ip->flags); if (copy_to_user(arg, &flags, sizeof(flags))) @@ -138,28 +195,56 @@ static int btrfs_ioctl_getflags(struct file *file, void __user *arg) return 0; } +static int check_flags(unsigned int flags) +{ + if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ + FS_NOATIME_FL | FS_NODUMP_FL | \ + FS_SYNC_FL | FS_DIRSYNC_FL | \ + FS_NOCOMP_FL | FS_COMPR_FL | + FS_NOCOW_FL)) + return -EOPNOTSUPP; + + if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) + return -EINVAL; + + return 0; +} + static int btrfs_ioctl_setflags(struct file *file, void __user *arg) { - struct inode *inode = file->f_path.dentry->d_inode; + struct inode *inode = file_inode(file); struct btrfs_inode *ip = BTRFS_I(inode); struct btrfs_root *root = ip->root; struct btrfs_trans_handle *trans; unsigned int flags, oldflags; int ret; + u64 ip_oldflags; + unsigned int i_oldflags; + umode_t mode; + + if (!inode_owner_or_capable(inode)) + return -EPERM; + + if (btrfs_root_readonly(root)) + return -EROFS; if (copy_from_user(&flags, arg, sizeof(flags))) return -EFAULT; - if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ - FS_NOATIME_FL | FS_NODUMP_FL | \ - FS_SYNC_FL | FS_DIRSYNC_FL)) - return -EOPNOTSUPP; + ret = check_flags(flags); + if (ret) + return ret; - if (!is_owner_or_cap(inode)) - return -EACCES; + ret = mnt_want_write_file(file); + if (ret) + return ret; mutex_lock(&inode->i_mutex); + ip_oldflags = ip->flags; + i_oldflags = inode->i_flags; + mode = inode->i_mode; + flags = btrfs_mask_flags(inode->i_mode, flags); oldflags = btrfs_flags_to_ioctl(ip->flags); if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { @@ -169,10 +254,6 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg) } } - ret = mnt_want_write(file->f_path.mnt); - if (ret) - goto out_unlock; - if (flags & FS_SYNC_FL) ip->flags |= BTRFS_INODE_SYNC; else @@ -197,62 +278,204 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg) ip->flags |= BTRFS_INODE_DIRSYNC; else ip->flags &= ~BTRFS_INODE_DIRSYNC; + if (flags & FS_NOCOW_FL) { + if (S_ISREG(mode)) { + /* + * It's safe to turn csums off here, no extents exist. + * Otherwise we want the flag to reflect the real COW + * status of the file and will not set it. + */ + if (inode->i_size == 0) + ip->flags |= BTRFS_INODE_NODATACOW + | BTRFS_INODE_NODATASUM; + } else { + ip->flags |= BTRFS_INODE_NODATACOW; + } + } else { + /* + * Revert back under same assuptions as above + */ + if (S_ISREG(mode)) { + if (inode->i_size == 0) + ip->flags &= ~(BTRFS_INODE_NODATACOW + | BTRFS_INODE_NODATASUM); + } else { + ip->flags &= ~BTRFS_INODE_NODATACOW; + } + } + /* + * The COMPRESS flag can only be changed by users, while the NOCOMPRESS + * flag may be changed automatically if compression code won't make + * things smaller. + */ + if (flags & FS_NOCOMP_FL) { + ip->flags &= ~BTRFS_INODE_COMPRESS; + ip->flags |= BTRFS_INODE_NOCOMPRESS; + + ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); + if (ret && ret != -ENODATA) + goto out_drop; + } else if (flags & FS_COMPR_FL) { + const char *comp; + + ip->flags |= BTRFS_INODE_COMPRESS; + ip->flags &= ~BTRFS_INODE_NOCOMPRESS; + + if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO) + comp = "lzo"; + else + comp = "zlib"; + ret = btrfs_set_prop(inode, "btrfs.compression", + comp, strlen(comp), 0); + if (ret) + goto out_drop; - trans = btrfs_join_transaction(root, 1); - BUG_ON(!trans); + } else { + ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); + } - ret = btrfs_update_inode(trans, root, inode); - BUG_ON(ret); + trans = btrfs_start_transaction(root, 1); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + goto out_drop; + } btrfs_update_iflags(inode); + inode_inc_iversion(inode); inode->i_ctime = CURRENT_TIME; + ret = btrfs_update_inode(trans, root, inode); + btrfs_end_transaction(trans, root); + out_drop: + if (ret) { + ip->flags = ip_oldflags; + inode->i_flags = i_oldflags; + } - mnt_drop_write(file->f_path.mnt); out_unlock: mutex_unlock(&inode->i_mutex); - return 0; + mnt_drop_write_file(file); + return ret; } static int btrfs_ioctl_getversion(struct file *file, int __user *arg) { - struct inode *inode = file->f_path.dentry->d_inode; + struct inode *inode = file_inode(file); return put_user(inode->i_generation, arg); } -static noinline int create_subvol(struct btrfs_root *root, +static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) +{ + struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); + struct btrfs_device *device; + struct request_queue *q; + struct fstrim_range range; + u64 minlen = ULLONG_MAX; + u64 num_devices = 0; + u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); + int ret; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + rcu_read_lock(); + list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, + dev_list) { + if (!device->bdev) + continue; + q = bdev_get_queue(device->bdev); + if (blk_queue_discard(q)) { + num_devices++; + minlen = min((u64)q->limits.discard_granularity, + minlen); + } + } + rcu_read_unlock(); + + if (!num_devices) + return -EOPNOTSUPP; + if (copy_from_user(&range, arg, sizeof(range))) + return -EFAULT; + if (range.start > total_bytes || + range.len < fs_info->sb->s_blocksize) + return -EINVAL; + + range.len = min(range.len, total_bytes - range.start); + range.minlen = max(range.minlen, minlen); + ret = btrfs_trim_fs(fs_info->tree_root, &range); + if (ret < 0) + return ret; + + if (copy_to_user(arg, &range, sizeof(range))) + return -EFAULT; + + return 0; +} + +int btrfs_is_empty_uuid(u8 *uuid) +{ + int i; + + for (i = 0; i < BTRFS_UUID_SIZE; i++) { + if (uuid[i]) + return 0; + } + return 1; +} + +static noinline int create_subvol(struct inode *dir, struct dentry *dentry, char *name, int namelen, - u64 *async_transid) + u64 *async_transid, + struct btrfs_qgroup_inherit *inherit) { struct btrfs_trans_handle *trans; struct btrfs_key key; struct btrfs_root_item root_item; struct btrfs_inode_item *inode_item; struct extent_buffer *leaf; + struct btrfs_root *root = BTRFS_I(dir)->root; struct btrfs_root *new_root; - struct inode *dir = dentry->d_parent->d_inode; + struct btrfs_block_rsv block_rsv; + struct timespec cur_time = CURRENT_TIME; + struct inode *inode; int ret; int err; u64 objectid; u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; u64 index = 0; + u64 qgroup_reserved; + uuid_le new_uuid; - ret = btrfs_find_free_objectid(NULL, root->fs_info->tree_root, - 0, &objectid); + ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); if (ret) return ret; + + btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); /* - * 1 - inode item - * 2 - refs - * 1 - root item - * 2 - dir items + * The same as the snapshot creation, please see the comment + * of create_snapshot(). */ - trans = btrfs_start_transaction(root, 6); - if (IS_ERR(trans)) - return PTR_ERR(trans); + ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, + 8, &qgroup_reserved, false); + if (ret) + return ret; + + trans = btrfs_start_transaction(root, 0); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + btrfs_subvolume_release_metadata(root, &block_rsv, + qgroup_reserved); + return ret; + } + trans->block_rsv = &block_rsv; + trans->bytes_reserved = block_rsv.size; + + ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); + if (ret) + goto fail; leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, objectid, NULL, 0, 0, 0); @@ -267,21 +490,25 @@ static noinline int create_subvol(struct btrfs_root *root, btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); btrfs_set_header_owner(leaf, objectid); - write_extent_buffer(leaf, root->fs_info->fsid, - (unsigned long)btrfs_header_fsid(leaf), + write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE); write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, - (unsigned long)btrfs_header_chunk_tree_uuid(leaf), + btrfs_header_chunk_tree_uuid(leaf), BTRFS_UUID_SIZE); btrfs_mark_buffer_dirty(leaf); + memset(&root_item, 0, sizeof(root_item)); + inode_item = &root_item.inode; - memset(inode_item, 0, sizeof(*inode_item)); - inode_item->generation = cpu_to_le64(1); - inode_item->size = cpu_to_le64(3); - inode_item->nlink = cpu_to_le32(1); - inode_item->nbytes = cpu_to_le64(root->leafsize); - inode_item->mode = cpu_to_le32(S_IFDIR | 0755); + btrfs_set_stack_inode_generation(inode_item, 1); + btrfs_set_stack_inode_size(inode_item, 3); + btrfs_set_stack_inode_nlink(inode_item, 1); + btrfs_set_stack_inode_nbytes(inode_item, root->leafsize); + btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); + + btrfs_set_root_flags(&root_item, 0); + btrfs_set_root_limit(&root_item, 0); + btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); btrfs_set_root_bytenr(&root_item, leaf->start); btrfs_set_root_generation(&root_item, trans->transid); @@ -290,8 +517,15 @@ static noinline int create_subvol(struct btrfs_root *root, btrfs_set_root_used(&root_item, leaf->len); btrfs_set_root_last_snapshot(&root_item, 0); - memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); - root_item.drop_level = 0; + btrfs_set_root_generation_v2(&root_item, + btrfs_root_generation(&root_item)); + uuid_le_gen(&new_uuid); + memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); + btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec); + btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec); + root_item.ctime = root_item.otime; + btrfs_set_root_ctransid(&root_item, trans->transid); + btrfs_set_root_otransid(&root_item, trans->transid); btrfs_tree_unlock(leaf); free_extent_buffer(leaf); @@ -309,23 +543,37 @@ static noinline int create_subvol(struct btrfs_root *root, key.offset = (u64)-1; new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); - BUG_ON(IS_ERR(new_root)); + if (IS_ERR(new_root)) { + btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); + ret = PTR_ERR(new_root); + goto fail; + } btrfs_record_root_in_trans(trans, new_root); - ret = btrfs_create_subvol_root(trans, new_root, new_dirid, - BTRFS_I(dir)->block_group); + ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); + if (ret) { + /* We potentially lose an unused inode item here */ + btrfs_abort_transaction(trans, root, ret); + goto fail; + } + /* * insert the directory item */ ret = btrfs_set_inode_index(dir, &index); - BUG_ON(ret); + if (ret) { + btrfs_abort_transaction(trans, root, ret); + goto fail; + } ret = btrfs_insert_dir_item(trans, root, - name, namelen, dir->i_ino, &key, + name, namelen, dir, &key, BTRFS_FT_DIR, index); - if (ret) + if (ret) { + btrfs_abort_transaction(trans, root, ret); goto fail; + } btrfs_i_size_write(dir, dir->i_size + namelen * 2); ret = btrfs_update_inode(trans, root, dir); @@ -333,79 +581,185 @@ static noinline int create_subvol(struct btrfs_root *root, ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, objectid, root->root_key.objectid, - dir->i_ino, index, name, namelen); - + btrfs_ino(dir), index, name, namelen); BUG_ON(ret); - d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); + ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, + root_item.uuid, BTRFS_UUID_KEY_SUBVOL, + objectid); + if (ret) + btrfs_abort_transaction(trans, root, ret); + fail: + trans->block_rsv = NULL; + trans->bytes_reserved = 0; + btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); + if (async_transid) { *async_transid = trans->transid; err = btrfs_commit_transaction_async(trans, root, 1); + if (err) + err = btrfs_commit_transaction(trans, root); } else { err = btrfs_commit_transaction(trans, root); } if (err && !ret) ret = err; + + if (!ret) { + inode = btrfs_lookup_dentry(dir, dentry); + if (IS_ERR(inode)) + return PTR_ERR(inode); + d_instantiate(dentry, inode); + } return ret; } -static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, - char *name, int namelen, u64 *async_transid) +static void btrfs_wait_nocow_write(struct btrfs_root *root) +{ + s64 writers; + DEFINE_WAIT(wait); + + do { + prepare_to_wait(&root->subv_writers->wait, &wait, + TASK_UNINTERRUPTIBLE); + + writers = percpu_counter_sum(&root->subv_writers->counter); + if (writers) + schedule(); + + finish_wait(&root->subv_writers->wait, &wait); + } while (writers); +} + +static int create_snapshot(struct btrfs_root *root, struct inode *dir, + struct dentry *dentry, char *name, int namelen, + u64 *async_transid, bool readonly, + struct btrfs_qgroup_inherit *inherit) { struct inode *inode; struct btrfs_pending_snapshot *pending_snapshot; struct btrfs_trans_handle *trans; int ret; - if (!root->ref_cows) + if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) return -EINVAL; + atomic_inc(&root->will_be_snapshoted); + smp_mb__after_atomic(); + btrfs_wait_nocow_write(root); + + ret = btrfs_start_delalloc_inodes(root, 0); + if (ret) + goto out; + + btrfs_wait_ordered_extents(root, -1); + pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); - if (!pending_snapshot) - return -ENOMEM; + if (!pending_snapshot) { + ret = -ENOMEM; + goto out; + } + + btrfs_init_block_rsv(&pending_snapshot->block_rsv, + BTRFS_BLOCK_RSV_TEMP); + /* + * 1 - parent dir inode + * 2 - dir entries + * 1 - root item + * 2 - root ref/backref + * 1 - root of snapshot + * 1 - UUID item + */ + ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, + &pending_snapshot->block_rsv, 8, + &pending_snapshot->qgroup_reserved, + false); + if (ret) + goto free; - btrfs_init_block_rsv(&pending_snapshot->block_rsv); pending_snapshot->dentry = dentry; pending_snapshot->root = root; + pending_snapshot->readonly = readonly; + pending_snapshot->dir = dir; + pending_snapshot->inherit = inherit; - trans = btrfs_start_transaction(root->fs_info->extent_root, 5); + trans = btrfs_start_transaction(root, 0); if (IS_ERR(trans)) { ret = PTR_ERR(trans); goto fail; } - ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); - BUG_ON(ret); - + spin_lock(&root->fs_info->trans_lock); list_add(&pending_snapshot->list, &trans->transaction->pending_snapshots); + spin_unlock(&root->fs_info->trans_lock); if (async_transid) { *async_transid = trans->transid; ret = btrfs_commit_transaction_async(trans, root->fs_info->extent_root, 1); + if (ret) + ret = btrfs_commit_transaction(trans, root); } else { ret = btrfs_commit_transaction(trans, root->fs_info->extent_root); } - BUG_ON(ret); + if (ret) + goto fail; ret = pending_snapshot->error; if (ret) goto fail; - btrfs_orphan_cleanup(pending_snapshot->snap); + ret = btrfs_orphan_cleanup(pending_snapshot->snap); + if (ret) + goto fail; + + /* + * If orphan cleanup did remove any orphans, it means the tree was + * modified and therefore the commit root is not the same as the + * current root anymore. This is a problem, because send uses the + * commit root and therefore can see inode items that don't exist + * in the current root anymore, and for example make calls to + * btrfs_iget, which will do tree lookups based on the current root + * and not on the commit root. Those lookups will fail, returning a + * -ESTALE error, and making send fail with that error. So make sure + * a send does not see any orphans we have just removed, and that it + * will see the same inodes regardless of whether a transaction + * commit happened before it started (meaning that the commit root + * will be the same as the current root) or not. + */ + if (readonly && pending_snapshot->snap->node != + pending_snapshot->snap->commit_root) { + trans = btrfs_join_transaction(pending_snapshot->snap); + if (IS_ERR(trans) && PTR_ERR(trans) != -ENOENT) { + ret = PTR_ERR(trans); + goto fail; + } + if (!IS_ERR(trans)) { + ret = btrfs_commit_transaction(trans, + pending_snapshot->snap); + if (ret) + goto fail; + } + } inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); if (IS_ERR(inode)) { ret = PTR_ERR(inode); goto fail; } - BUG_ON(!inode); + d_instantiate(dentry, inode); ret = 0; fail: + btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, + &pending_snapshot->block_rsv, + pending_snapshot->qgroup_reserved); +free: kfree(pending_snapshot); +out: + atomic_dec(&root->will_be_snapshoted); return ret; } @@ -415,13 +769,13 @@ fail: */ static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) { - uid_t fsuid = current_fsuid(); + kuid_t fsuid = current_fsuid(); if (!(dir->i_mode & S_ISVTX)) return 0; - if (inode->i_uid == fsuid) + if (uid_eq(inode->i_uid, fsuid)) return 0; - if (dir->i_uid == fsuid) + if (uid_eq(dir->i_uid, fsuid)) return 0; return !capable(CAP_FOWNER); } @@ -446,7 +800,7 @@ static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) * nfs_async_unlink(). */ -static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) +static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) { int error; @@ -454,7 +808,7 @@ static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) return -ENOENT; BUG_ON(victim->d_parent->d_inode != dir); - audit_inode_child(victim, dir); + audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); error = inode_permission(dir, MAY_WRITE | MAY_EXEC); if (error) @@ -497,13 +851,16 @@ static inline int btrfs_may_create(struct inode *dir, struct dentry *child) static noinline int btrfs_mksubvol(struct path *parent, char *name, int namelen, struct btrfs_root *snap_src, - u64 *async_transid) + u64 *async_transid, bool readonly, + struct btrfs_qgroup_inherit *inherit) { struct inode *dir = parent->dentry->d_inode; struct dentry *dentry; int error; - mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); + error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); + if (error == -EINTR) + return error; dentry = lookup_one_len(name, parent->dentry, namelen); error = PTR_ERR(dentry); @@ -514,13 +871,19 @@ static noinline int btrfs_mksubvol(struct path *parent, if (dentry->d_inode) goto out_dput; - error = mnt_want_write(parent->mnt); + error = btrfs_may_create(dir, dentry); if (error) goto out_dput; - error = btrfs_may_create(dir, dentry); + /* + * even if this name doesn't exist, we may get hash collisions. + * check for them now when we can safely fail + */ + error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, + dir->i_ino, name, + namelen); if (error) - goto out_drop_write; + goto out_dput; down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); @@ -528,18 +891,16 @@ static noinline int btrfs_mksubvol(struct path *parent, goto out_up_read; if (snap_src) { - error = create_snapshot(snap_src, dentry, - name, namelen, async_transid); + error = create_snapshot(snap_src, dir, dentry, name, namelen, + async_transid, readonly, inherit); } else { - error = create_subvol(BTRFS_I(dir)->root, dentry, - name, namelen, async_transid); + error = create_subvol(dir, dentry, name, namelen, + async_transid, inherit); } if (!error) fsnotify_mkdir(dir, dentry); out_up_read: up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); -out_drop_write: - mnt_drop_write(parent->mnt); out_dput: dput(dentry); out_unlock: @@ -547,27 +908,115 @@ out_unlock: return error; } -static int should_defrag_range(struct inode *inode, u64 start, u64 len, - int thresh, u64 *last_len, u64 *skip, - u64 *defrag_end) +/* + * When we're defragging a range, we don't want to kick it off again + * if it is really just waiting for delalloc to send it down. + * If we find a nice big extent or delalloc range for the bytes in the + * file you want to defrag, we return 0 to let you know to skip this + * part of the file + */ +static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) { struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; struct extent_map *em = NULL; struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; - int ret = 1; + u64 end; + read_lock(&em_tree->lock); + em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); + read_unlock(&em_tree->lock); - if (thresh == 0) - thresh = 256 * 1024; + if (em) { + end = extent_map_end(em); + free_extent_map(em); + if (end - offset > thresh) + return 0; + } + /* if we already have a nice delalloc here, just stop */ + thresh /= 2; + end = count_range_bits(io_tree, &offset, offset + thresh, + thresh, EXTENT_DELALLOC, 1); + if (end >= thresh) + return 0; + return 1; +} - /* - * make sure that once we start defragging and extent, we keep on - * defragging it - */ - if (start < *defrag_end) - return 1; +/* + * helper function to walk through a file and find extents + * newer than a specific transid, and smaller than thresh. + * + * This is used by the defragging code to find new and small + * extents + */ +static int find_new_extents(struct btrfs_root *root, + struct inode *inode, u64 newer_than, + u64 *off, int thresh) +{ + struct btrfs_path *path; + struct btrfs_key min_key; + struct extent_buffer *leaf; + struct btrfs_file_extent_item *extent; + int type; + int ret; + u64 ino = btrfs_ino(inode); - *skip = 0; + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + min_key.objectid = ino; + min_key.type = BTRFS_EXTENT_DATA_KEY; + min_key.offset = *off; + + while (1) { + path->keep_locks = 1; + ret = btrfs_search_forward(root, &min_key, path, newer_than); + if (ret != 0) + goto none; + path->keep_locks = 0; + btrfs_unlock_up_safe(path, 1); +process_slot: + if (min_key.objectid != ino) + goto none; + if (min_key.type != BTRFS_EXTENT_DATA_KEY) + goto none; + + leaf = path->nodes[0]; + extent = btrfs_item_ptr(leaf, path->slots[0], + struct btrfs_file_extent_item); + + type = btrfs_file_extent_type(leaf, extent); + if (type == BTRFS_FILE_EXTENT_REG && + btrfs_file_extent_num_bytes(leaf, extent) < thresh && + check_defrag_in_cache(inode, min_key.offset, thresh)) { + *off = min_key.offset; + btrfs_free_path(path); + return 0; + } + + path->slots[0]++; + if (path->slots[0] < btrfs_header_nritems(leaf)) { + btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); + goto process_slot; + } + + if (min_key.offset == (u64)-1) + goto none; + + min_key.offset++; + btrfs_release_path(path); + } +none: + btrfs_free_path(path); + return -ENOENT; +} + +static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) +{ + struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; + struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; + struct extent_map *em; + u64 len = PAGE_CACHE_SIZE; /* * hopefully we have this extent in the tree already, try without @@ -578,25 +1027,76 @@ static int should_defrag_range(struct inode *inode, u64 start, u64 len, read_unlock(&em_tree->lock); if (!em) { + struct extent_state *cached = NULL; + u64 end = start + len - 1; + /* get the big lock and read metadata off disk */ - lock_extent(io_tree, start, start + len - 1, GFP_NOFS); + lock_extent_bits(io_tree, start, end, 0, &cached); em = btrfs_get_extent(inode, NULL, 0, start, len, 0); - unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); + unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS); if (IS_ERR(em)) - return 0; + return NULL; } + return em; +} + +static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) +{ + struct extent_map *next; + bool ret = true; + + /* this is the last extent */ + if (em->start + em->len >= i_size_read(inode)) + return false; + + next = defrag_lookup_extent(inode, em->start + em->len); + if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE || + (em->block_start + em->block_len == next->block_start)) + ret = false; + + free_extent_map(next); + return ret; +} + +static int should_defrag_range(struct inode *inode, u64 start, int thresh, + u64 *last_len, u64 *skip, u64 *defrag_end, + int compress) +{ + struct extent_map *em; + int ret = 1; + bool next_mergeable = true; + + /* + * make sure that once we start defragging an extent, we keep on + * defragging it + */ + if (start < *defrag_end) + return 1; + + *skip = 0; + + em = defrag_lookup_extent(inode, start); + if (!em) + return 0; + /* this will cover holes, and inline extents */ - if (em->block_start >= EXTENT_MAP_LAST_BYTE) + if (em->block_start >= EXTENT_MAP_LAST_BYTE) { ret = 0; + goto out; + } + + next_mergeable = defrag_check_next_extent(inode, em); /* - * we hit a real extent, if it is big don't bother defragging it again + * we hit a real extent, if it is big or the next extent is not a + * real extent, don't bother defragging it */ - if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) + if (!compress && (*last_len == 0 || *last_len >= thresh) && + (em->len >= thresh || !next_mergeable)) ret = 0; - +out: /* * last_len ends up being a counter of how many bytes we've defragged. * every time we choose not to defrag an extent, we reset *last_len @@ -606,7 +1106,6 @@ static int should_defrag_range(struct inode *inode, u64 start, u64 len, * extent will force at least part of that big extent to be defragged. */ if (ret) { - *last_len += len; *defrag_end = extent_map_end(em); } else { *last_len = 0; @@ -618,75 +1117,83 @@ static int should_defrag_range(struct inode *inode, u64 start, u64 len, return ret; } -static int btrfs_defrag_file(struct file *file, - struct btrfs_ioctl_defrag_range_args *range) +/* + * it doesn't do much good to defrag one or two pages + * at a time. This pulls in a nice chunk of pages + * to COW and defrag. + * + * It also makes sure the delalloc code has enough + * dirty data to avoid making new small extents as part + * of the defrag + * + * It's a good idea to start RA on this range + * before calling this. + */ +static int cluster_pages_for_defrag(struct inode *inode, + struct page **pages, + unsigned long start_index, + unsigned long num_pages) { - struct inode *inode = fdentry(file)->d_inode; - struct btrfs_root *root = BTRFS_I(inode)->root; - struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; - struct btrfs_ordered_extent *ordered; - struct page *page; - unsigned long last_index; - unsigned long ra_pages = root->fs_info->bdi.ra_pages; - unsigned long total_read = 0; + unsigned long file_end; + u64 isize = i_size_read(inode); u64 page_start; u64 page_end; - u64 last_len = 0; - u64 skip = 0; - u64 defrag_end = 0; - unsigned long i; + u64 page_cnt; int ret; + int i; + int i_done; + struct btrfs_ordered_extent *ordered; + struct extent_state *cached_state = NULL; + struct extent_io_tree *tree; + gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); - if (inode->i_size == 0) + file_end = (isize - 1) >> PAGE_CACHE_SHIFT; + if (!isize || start_index > file_end) return 0; - if (range->start + range->len > range->start) { - last_index = min_t(u64, inode->i_size - 1, - range->start + range->len - 1) >> PAGE_CACHE_SHIFT; - } else { - last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; - } + page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); - i = range->start >> PAGE_CACHE_SHIFT; - while (i <= last_index) { - if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, - PAGE_CACHE_SIZE, - range->extent_thresh, - &last_len, &skip, - &defrag_end)) { - unsigned long next; - /* - * the should_defrag function tells us how much to skip - * bump our counter by the suggested amount - */ - next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; - i = max(i + 1, next); - continue; - } - - if (total_read % ra_pages == 0) { - btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, - min(last_index, i + ra_pages - 1)); - } - total_read++; - mutex_lock(&inode->i_mutex); - if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) - BTRFS_I(inode)->force_compress = 1; + ret = btrfs_delalloc_reserve_space(inode, + page_cnt << PAGE_CACHE_SHIFT); + if (ret) + return ret; + i_done = 0; + tree = &BTRFS_I(inode)->io_tree; - ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); - if (ret) - goto err_unlock; + /* step one, lock all the pages */ + for (i = 0; i < page_cnt; i++) { + struct page *page; again: - if (inode->i_size == 0 || - i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) { - ret = 0; - goto err_reservations; - } + page = find_or_create_page(inode->i_mapping, + start_index + i, mask); + if (!page) + break; - page = grab_cache_page(inode->i_mapping, i); - if (!page) { - ret = -ENOMEM; - goto err_reservations; + page_start = page_offset(page); + page_end = page_start + PAGE_CACHE_SIZE - 1; + while (1) { + lock_extent_bits(tree, page_start, page_end, + 0, &cached_state); + ordered = btrfs_lookup_ordered_extent(inode, + page_start); + unlock_extent_cached(tree, page_start, page_end, + &cached_state, GFP_NOFS); + if (!ordered) + break; + + unlock_page(page); + btrfs_start_ordered_extent(inode, ordered, 1); + btrfs_put_ordered_extent(ordered); + lock_page(page); + /* + * we unlocked the page above, so we need check if + * it was released or not. + */ + if (page->mapping != inode->i_mapping) { + unlock_page(page); + page_cache_release(page); + goto again; + } } if (!PageUptodate(page)) { @@ -696,7 +1203,7 @@ again: unlock_page(page); page_cache_release(page); ret = -EIO; - goto err_reservations; + break; } } @@ -706,53 +1213,253 @@ again: goto again; } - wait_on_page_writeback(page); + pages[i] = page; + i_done++; + } + if (!i_done || ret) + goto out; - if (PageDirty(page)) { - btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); - goto loop_unlock; - } + if (!(inode->i_sb->s_flags & MS_ACTIVE)) + goto out; - page_start = (u64)page->index << PAGE_CACHE_SHIFT; - page_end = page_start + PAGE_CACHE_SIZE - 1; - lock_extent(io_tree, page_start, page_end, GFP_NOFS); + /* + * so now we have a nice long stream of locked + * and up to date pages, lets wait on them + */ + for (i = 0; i < i_done; i++) + wait_on_page_writeback(pages[i]); + + page_start = page_offset(pages[0]); + page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; + + lock_extent_bits(&BTRFS_I(inode)->io_tree, + page_start, page_end - 1, 0, &cached_state); + clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, + page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | + EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, + &cached_state, GFP_NOFS); + + if (i_done != page_cnt) { + spin_lock(&BTRFS_I(inode)->lock); + BTRFS_I(inode)->outstanding_extents++; + spin_unlock(&BTRFS_I(inode)->lock); + btrfs_delalloc_release_space(inode, + (page_cnt - i_done) << PAGE_CACHE_SHIFT); + } - ordered = btrfs_lookup_ordered_extent(inode, page_start); - if (ordered) { - unlock_extent(io_tree, page_start, page_end, GFP_NOFS); - unlock_page(page); - page_cache_release(page); - btrfs_start_ordered_extent(inode, ordered, 1); - btrfs_put_ordered_extent(ordered); - goto again; - } - set_page_extent_mapped(page); + set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, + &cached_state, GFP_NOFS); + + unlock_extent_cached(&BTRFS_I(inode)->io_tree, + page_start, page_end - 1, &cached_state, + GFP_NOFS); + + for (i = 0; i < i_done; i++) { + clear_page_dirty_for_io(pages[i]); + ClearPageChecked(pages[i]); + set_page_extent_mapped(pages[i]); + set_page_dirty(pages[i]); + unlock_page(pages[i]); + page_cache_release(pages[i]); + } + return i_done; +out: + for (i = 0; i < i_done; i++) { + unlock_page(pages[i]); + page_cache_release(pages[i]); + } + btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); + return ret; + +} + +int btrfs_defrag_file(struct inode *inode, struct file *file, + struct btrfs_ioctl_defrag_range_args *range, + u64 newer_than, unsigned long max_to_defrag) +{ + struct btrfs_root *root = BTRFS_I(inode)->root; + struct file_ra_state *ra = NULL; + unsigned long last_index; + u64 isize = i_size_read(inode); + u64 last_len = 0; + u64 skip = 0; + u64 defrag_end = 0; + u64 newer_off = range->start; + unsigned long i; + unsigned long ra_index = 0; + int ret; + int defrag_count = 0; + int compress_type = BTRFS_COMPRESS_ZLIB; + int extent_thresh = range->extent_thresh; + unsigned long max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; + unsigned long cluster = max_cluster; + u64 new_align = ~((u64)128 * 1024 - 1); + struct page **pages = NULL; + + if (isize == 0) + return 0; + + if (range->start >= isize) + return -EINVAL; + + if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { + if (range->compress_type > BTRFS_COMPRESS_TYPES) + return -EINVAL; + if (range->compress_type) + compress_type = range->compress_type; + } + + if (extent_thresh == 0) + extent_thresh = 256 * 1024; + + /* + * if we were not given a file, allocate a readahead + * context + */ + if (!file) { + ra = kzalloc(sizeof(*ra), GFP_NOFS); + if (!ra) + return -ENOMEM; + file_ra_state_init(ra, inode->i_mapping); + } else { + ra = &file->f_ra; + } + + pages = kmalloc_array(max_cluster, sizeof(struct page *), + GFP_NOFS); + if (!pages) { + ret = -ENOMEM; + goto out_ra; + } + + /* find the last page to defrag */ + if (range->start + range->len > range->start) { + last_index = min_t(u64, isize - 1, + range->start + range->len - 1) >> PAGE_CACHE_SHIFT; + } else { + last_index = (isize - 1) >> PAGE_CACHE_SHIFT; + } + + if (newer_than) { + ret = find_new_extents(root, inode, newer_than, + &newer_off, 64 * 1024); + if (!ret) { + range->start = newer_off; + /* + * we always align our defrag to help keep + * the extents in the file evenly spaced + */ + i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; + } else + goto out_ra; + } else { + i = range->start >> PAGE_CACHE_SHIFT; + } + if (!max_to_defrag) + max_to_defrag = last_index + 1; + + /* + * make writeback starts from i, so the defrag range can be + * written sequentially. + */ + if (i < inode->i_mapping->writeback_index) + inode->i_mapping->writeback_index = i; + + while (i <= last_index && defrag_count < max_to_defrag && + (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> + PAGE_CACHE_SHIFT)) { /* - * this makes sure page_mkwrite is called on the - * page if it is dirtied again later + * make sure we stop running if someone unmounts + * the FS */ - clear_page_dirty_for_io(page); - clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, - page_end, EXTENT_DIRTY | EXTENT_DELALLOC | - EXTENT_DO_ACCOUNTING, GFP_NOFS); - - btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); - ClearPageChecked(page); - set_page_dirty(page); - unlock_extent(io_tree, page_start, page_end, GFP_NOFS); - -loop_unlock: - unlock_page(page); - page_cache_release(page); + if (!(inode->i_sb->s_flags & MS_ACTIVE)) + break; + + if (btrfs_defrag_cancelled(root->fs_info)) { + printk(KERN_DEBUG "BTRFS: defrag_file cancelled\n"); + ret = -EAGAIN; + break; + } + + if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, + extent_thresh, &last_len, &skip, + &defrag_end, range->flags & + BTRFS_DEFRAG_RANGE_COMPRESS)) { + unsigned long next; + /* + * the should_defrag function tells us how much to skip + * bump our counter by the suggested amount + */ + next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; + i = max(i + 1, next); + continue; + } + + if (!newer_than) { + cluster = (PAGE_CACHE_ALIGN(defrag_end) >> + PAGE_CACHE_SHIFT) - i; + cluster = min(cluster, max_cluster); + } else { + cluster = max_cluster; + } + + if (i + cluster > ra_index) { + ra_index = max(i, ra_index); + btrfs_force_ra(inode->i_mapping, ra, file, ra_index, + cluster); + ra_index += max_cluster; + } + + mutex_lock(&inode->i_mutex); + if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) + BTRFS_I(inode)->force_compress = compress_type; + ret = cluster_pages_for_defrag(inode, pages, i, cluster); + if (ret < 0) { + mutex_unlock(&inode->i_mutex); + goto out_ra; + } + + defrag_count += ret; + balance_dirty_pages_ratelimited(inode->i_mapping); mutex_unlock(&inode->i_mutex); - balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); - i++; + if (newer_than) { + if (newer_off == (u64)-1) + break; + + if (ret > 0) + i += ret; + + newer_off = max(newer_off + 1, + (u64)i << PAGE_CACHE_SHIFT); + + ret = find_new_extents(root, inode, + newer_than, &newer_off, + 64 * 1024); + if (!ret) { + range->start = newer_off; + i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; + } else { + break; + } + } else { + if (ret > 0) { + i += ret; + last_len += ret << PAGE_CACHE_SHIFT; + } else { + i++; + last_len = 0; + } + } } - if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) + if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { filemap_flush(inode->i_mapping); + if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, + &BTRFS_I(inode)->runtime_flags)) + filemap_flush(inode->i_mapping); + } if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { /* the filemap_flush will queue IO into the worker threads, but @@ -767,66 +1474,96 @@ loop_unlock: atomic_read(&root->fs_info->async_delalloc_pages) == 0)); } atomic_dec(&root->fs_info->async_submit_draining); + } - mutex_lock(&inode->i_mutex); - BTRFS_I(inode)->force_compress = 0; - mutex_unlock(&inode->i_mutex); + if (range->compress_type == BTRFS_COMPRESS_LZO) { + btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); } - return 0; + ret = defrag_count; -err_reservations: - btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); -err_unlock: - mutex_unlock(&inode->i_mutex); +out_ra: + if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { + mutex_lock(&inode->i_mutex); + BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; + mutex_unlock(&inode->i_mutex); + } + if (!file) + kfree(ra); + kfree(pages); return ret; } -static noinline int btrfs_ioctl_resize(struct btrfs_root *root, +static noinline int btrfs_ioctl_resize(struct file *file, void __user *arg) { u64 new_size; u64 old_size; u64 devid = 1; + struct btrfs_root *root = BTRFS_I(file_inode(file))->root; struct btrfs_ioctl_vol_args *vol_args; struct btrfs_trans_handle *trans; struct btrfs_device *device = NULL; char *sizestr; + char *retptr; char *devstr = NULL; int ret = 0; int mod = 0; - if (root->fs_info->sb->s_flags & MS_RDONLY) - return -EROFS; - if (!capable(CAP_SYS_ADMIN)) return -EPERM; + ret = mnt_want_write_file(file); + if (ret) + return ret; + + if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, + 1)) { + mnt_drop_write_file(file); + return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; + } + + mutex_lock(&root->fs_info->volume_mutex); vol_args = memdup_user(arg, sizeof(*vol_args)); - if (IS_ERR(vol_args)) - return PTR_ERR(vol_args); + if (IS_ERR(vol_args)) { + ret = PTR_ERR(vol_args); + goto out; + } vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; - mutex_lock(&root->fs_info->volume_mutex); sizestr = vol_args->name; devstr = strchr(sizestr, ':'); if (devstr) { - char *end; sizestr = devstr + 1; *devstr = '\0'; devstr = vol_args->name; - devid = simple_strtoull(devstr, &end, 10); - printk(KERN_INFO "resizing devid %llu\n", - (unsigned long long)devid); + ret = kstrtoull(devstr, 10, &devid); + if (ret) + goto out_free; + if (!devid) { + ret = -EINVAL; + goto out_free; + } + btrfs_info(root->fs_info, "resizing devid %llu", devid); } - device = btrfs_find_device(root, devid, NULL, NULL); + + device = btrfs_find_device(root->fs_info, devid, NULL, NULL); if (!device) { - printk(KERN_INFO "resizer unable to find device %llu\n", - (unsigned long long)devid); - ret = -EINVAL; - goto out_unlock; + btrfs_info(root->fs_info, "resizer unable to find device %llu", + devid); + ret = -ENODEV; + goto out_free; + } + + if (!device->writeable) { + btrfs_info(root->fs_info, + "resizer unable to apply on readonly device %llu", + devid); + ret = -EPERM; + goto out_free; } + if (!strcmp(sizestr, "max")) new_size = device->bdev->bd_inode->i_size; else { @@ -837,159 +1574,341 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root, mod = 1; sizestr++; } - new_size = memparse(sizestr, NULL); - if (new_size == 0) { + new_size = memparse(sizestr, &retptr); + if (*retptr != '\0' || new_size == 0) { ret = -EINVAL; - goto out_unlock; + goto out_free; } } + if (device->is_tgtdev_for_dev_replace) { + ret = -EPERM; + goto out_free; + } + old_size = device->total_bytes; if (mod < 0) { if (new_size > old_size) { ret = -EINVAL; - goto out_unlock; + goto out_free; } new_size = old_size - new_size; } else if (mod > 0) { + if (new_size > ULLONG_MAX - old_size) { + ret = -ERANGE; + goto out_free; + } new_size = old_size + new_size; } if (new_size < 256 * 1024 * 1024) { ret = -EINVAL; - goto out_unlock; + goto out_free; } if (new_size > device->bdev->bd_inode->i_size) { ret = -EFBIG; - goto out_unlock; + goto out_free; } do_div(new_size, root->sectorsize); new_size *= root->sectorsize; - printk(KERN_INFO "new size for %s is %llu\n", - device->name, (unsigned long long)new_size); + printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n", + rcu_str_deref(device->name), new_size); if (new_size > old_size) { trans = btrfs_start_transaction(root, 0); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + goto out_free; + } ret = btrfs_grow_device(trans, device, new_size); btrfs_commit_transaction(trans, root); - } else { + } else if (new_size < old_size) { ret = btrfs_shrink_device(device, new_size); - } + } /* equal, nothing need to do */ -out_unlock: - mutex_unlock(&root->fs_info->volume_mutex); +out_free: kfree(vol_args); +out: + mutex_unlock(&root->fs_info->volume_mutex); + atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); + mnt_drop_write_file(file); return ret; } static noinline int btrfs_ioctl_snap_create_transid(struct file *file, - char *name, - unsigned long fd, - int subvol, - u64 *transid) + char *name, unsigned long fd, int subvol, + u64 *transid, bool readonly, + struct btrfs_qgroup_inherit *inherit) { - struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; - struct file *src_file; int namelen; int ret = 0; - if (root->fs_info->sb->s_flags & MS_RDONLY) - return -EROFS; + ret = mnt_want_write_file(file); + if (ret) + goto out; namelen = strlen(name); if (strchr(name, '/')) { ret = -EINVAL; - goto out; + goto out_drop_write; + } + + if (name[0] == '.' && + (namelen == 1 || (name[1] == '.' && namelen == 2))) { + ret = -EEXIST; + goto out_drop_write; } if (subvol) { ret = btrfs_mksubvol(&file->f_path, name, namelen, - NULL, transid); + NULL, transid, readonly, inherit); } else { + struct fd src = fdget(fd); struct inode *src_inode; - src_file = fget(fd); - if (!src_file) { + if (!src.file) { ret = -EINVAL; - goto out; + goto out_drop_write; } - src_inode = src_file->f_path.dentry->d_inode; - if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { - printk(KERN_INFO "btrfs: Snapshot src from " - "another FS\n"); - ret = -EINVAL; - fput(src_file); - goto out; + src_inode = file_inode(src.file); + if (src_inode->i_sb != file_inode(file)->i_sb) { + btrfs_info(BTRFS_I(src_inode)->root->fs_info, + "Snapshot src from another FS"); + ret = -EXDEV; + } else if (!inode_owner_or_capable(src_inode)) { + /* + * Subvolume creation is not restricted, but snapshots + * are limited to own subvolumes only + */ + ret = -EPERM; + } else { + ret = btrfs_mksubvol(&file->f_path, name, namelen, + BTRFS_I(src_inode)->root, + transid, readonly, inherit); } - ret = btrfs_mksubvol(&file->f_path, name, namelen, - BTRFS_I(src_inode)->root, - transid); - fput(src_file); + fdput(src); } +out_drop_write: + mnt_drop_write_file(file); out: return ret; } static noinline int btrfs_ioctl_snap_create(struct file *file, - void __user *arg, int subvol, - int async) + void __user *arg, int subvol) { - struct btrfs_ioctl_vol_args *vol_args = NULL; - struct btrfs_ioctl_async_vol_args *async_vol_args = NULL; - char *name; - u64 fd; - u64 transid = 0; + struct btrfs_ioctl_vol_args *vol_args; int ret; - if (async) { - async_vol_args = memdup_user(arg, sizeof(*async_vol_args)); - if (IS_ERR(async_vol_args)) - return PTR_ERR(async_vol_args); + vol_args = memdup_user(arg, sizeof(*vol_args)); + if (IS_ERR(vol_args)) + return PTR_ERR(vol_args); + vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; - name = async_vol_args->name; - fd = async_vol_args->fd; - async_vol_args->name[BTRFS_SNAPSHOT_NAME_MAX] = '\0'; - } else { - vol_args = memdup_user(arg, sizeof(*vol_args)); - if (IS_ERR(vol_args)) - return PTR_ERR(vol_args); - name = vol_args->name; - fd = vol_args->fd; - vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; - } + ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, + vol_args->fd, subvol, + NULL, false, NULL); - ret = btrfs_ioctl_snap_create_transid(file, name, fd, - subvol, &transid); + kfree(vol_args); + return ret; +} - if (!ret && async) { - if (copy_to_user(arg + - offsetof(struct btrfs_ioctl_async_vol_args, - transid), &transid, sizeof(transid))) - return -EFAULT; +static noinline int btrfs_ioctl_snap_create_v2(struct file *file, + void __user *arg, int subvol) +{ + struct btrfs_ioctl_vol_args_v2 *vol_args; + int ret; + u64 transid = 0; + u64 *ptr = NULL; + bool readonly = false; + struct btrfs_qgroup_inherit *inherit = NULL; + + vol_args = memdup_user(arg, sizeof(*vol_args)); + if (IS_ERR(vol_args)) + return PTR_ERR(vol_args); + vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; + + if (vol_args->flags & + ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | + BTRFS_SUBVOL_QGROUP_INHERIT)) { + ret = -EOPNOTSUPP; + goto out; + } + + if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) + ptr = &transid; + if (vol_args->flags & BTRFS_SUBVOL_RDONLY) + readonly = true; + if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { + if (vol_args->size > PAGE_CACHE_SIZE) { + ret = -EINVAL; + goto out; + } + inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); + if (IS_ERR(inherit)) { + ret = PTR_ERR(inherit); + goto out; + } } + ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, + vol_args->fd, subvol, ptr, + readonly, inherit); + + if (ret == 0 && ptr && + copy_to_user(arg + + offsetof(struct btrfs_ioctl_vol_args_v2, + transid), ptr, sizeof(*ptr))) + ret = -EFAULT; +out: kfree(vol_args); - kfree(async_vol_args); + kfree(inherit); + return ret; +} + +static noinline int btrfs_ioctl_subvol_getflags(struct file *file, + void __user *arg) +{ + struct inode *inode = file_inode(file); + struct btrfs_root *root = BTRFS_I(inode)->root; + int ret = 0; + u64 flags = 0; + + if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) + return -EINVAL; + + down_read(&root->fs_info->subvol_sem); + if (btrfs_root_readonly(root)) + flags |= BTRFS_SUBVOL_RDONLY; + up_read(&root->fs_info->subvol_sem); + + if (copy_to_user(arg, &flags, sizeof(flags))) + ret = -EFAULT; return ret; } +static noinline int btrfs_ioctl_subvol_setflags(struct file *file, + void __user *arg) +{ + struct inode *inode = file_inode(file); + struct btrfs_root *root = BTRFS_I(inode)->root; + struct btrfs_trans_handle *trans; + u64 root_flags; + u64 flags; + int ret = 0; + + if (!inode_owner_or_capable(inode)) + return -EPERM; + + ret = mnt_want_write_file(file); + if (ret) + goto out; + + if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { + ret = -EINVAL; + goto out_drop_write; + } + + if (copy_from_user(&flags, arg, sizeof(flags))) { + ret = -EFAULT; + goto out_drop_write; + } + + if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { + ret = -EINVAL; + goto out_drop_write; + } + + if (flags & ~BTRFS_SUBVOL_RDONLY) { + ret = -EOPNOTSUPP; + goto out_drop_write; + } + + down_write(&root->fs_info->subvol_sem); + + /* nothing to do */ + if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) + goto out_drop_sem; + + root_flags = btrfs_root_flags(&root->root_item); + if (flags & BTRFS_SUBVOL_RDONLY) { + btrfs_set_root_flags(&root->root_item, + root_flags | BTRFS_ROOT_SUBVOL_RDONLY); + } else { + /* + * Block RO -> RW transition if this subvolume is involved in + * send + */ + spin_lock(&root->root_item_lock); + if (root->send_in_progress == 0) { + btrfs_set_root_flags(&root->root_item, + root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); + spin_unlock(&root->root_item_lock); + } else { + spin_unlock(&root->root_item_lock); + btrfs_warn(root->fs_info, + "Attempt to set subvolume %llu read-write during send", + root->root_key.objectid); + ret = -EPERM; + goto out_drop_sem; + } + } + + trans = btrfs_start_transaction(root, 1); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + goto out_reset; + } + + ret = btrfs_update_root(trans, root->fs_info->tree_root, + &root->root_key, &root->root_item); + + btrfs_commit_transaction(trans, root); +out_reset: + if (ret) + btrfs_set_root_flags(&root->root_item, root_flags); +out_drop_sem: + up_write(&root->fs_info->subvol_sem); +out_drop_write: + mnt_drop_write_file(file); +out: + return ret; +} + /* * helper to check if the subvolume references other subvolumes */ static noinline int may_destroy_subvol(struct btrfs_root *root) { struct btrfs_path *path; + struct btrfs_dir_item *di; struct btrfs_key key; + u64 dir_id; int ret; path = btrfs_alloc_path(); if (!path) return -ENOMEM; + /* Make sure this root isn't set as the default subvol */ + dir_id = btrfs_super_root_dir(root->fs_info->super_copy); + di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, + dir_id, "default", 7, 0); + if (di && !IS_ERR(di)) { + btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); + if (key.objectid == root->root_key.objectid) { + ret = -EPERM; + btrfs_err(root->fs_info, "deleting default subvolume " + "%llu is not allowed", key.objectid); + goto out; + } + btrfs_release_path(path); + } + key.objectid = root->root_key.objectid; key.type = BTRFS_ROOT_REF_KEY; key.offset = (u64)-1; @@ -1041,7 +1960,8 @@ static noinline int copy_to_sk(struct btrfs_root *root, struct btrfs_path *path, struct btrfs_key *key, struct btrfs_ioctl_search_key *sk, - char *buf, + size_t *buf_size, + char __user *ubuf, unsigned long *sk_offset, int *num_found) { @@ -1053,7 +1973,6 @@ static noinline int copy_to_sk(struct btrfs_root *root, int nritems; int i; int slot; - int found = 0; int ret = 0; leaf = path->nodes[0]; @@ -1070,19 +1989,31 @@ static noinline int copy_to_sk(struct btrfs_root *root, item_off = btrfs_item_ptr_offset(leaf, i); item_len = btrfs_item_size_nr(leaf, i); - if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) + btrfs_item_key_to_cpu(leaf, key, i); + if (!key_in_sk(key, sk)) + continue; + + if (sizeof(sh) + item_len > *buf_size) { + if (*num_found) { + ret = 1; + goto out; + } + + /* + * return one empty item back for v1, which does not + * handle -EOVERFLOW + */ + + *buf_size = sizeof(sh) + item_len; item_len = 0; + ret = -EOVERFLOW; + } - if (sizeof(sh) + item_len + *sk_offset > - BTRFS_SEARCH_ARGS_BUFSIZE) { + if (sizeof(sh) + item_len + *sk_offset > *buf_size) { ret = 1; - goto overflow; + goto out; } - btrfs_item_key_to_cpu(leaf, key, i); - if (!key_in_sk(key, sk)) - continue; - sh.objectid = key->objectid; sh.offset = key->offset; sh.type = key->type; @@ -1090,20 +2021,33 @@ static noinline int copy_to_sk(struct btrfs_root *root, sh.transid = found_transid; /* copy search result header */ - memcpy(buf + *sk_offset, &sh, sizeof(sh)); + if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) { + ret = -EFAULT; + goto out; + } + *sk_offset += sizeof(sh); if (item_len) { - char *p = buf + *sk_offset; + char __user *up = ubuf + *sk_offset; /* copy the item */ - read_extent_buffer(leaf, p, - item_off, item_len); + if (read_extent_buffer_to_user(leaf, up, + item_off, item_len)) { + ret = -EFAULT; + goto out; + } + *sk_offset += item_len; } - found++; + (*num_found)++; - if (*num_found >= sk->nr_items) - break; + if (ret) /* -EOVERFLOW from above */ + goto out; + + if (*num_found >= sk->nr_items) { + ret = 1; + goto out; + } } advance_key: ret = 0; @@ -1118,24 +2062,37 @@ advance_key: key->objectid++; } else ret = 1; -overflow: - *num_found += found; +out: + /* + * 0: all items from this leaf copied, continue with next + * 1: * more items can be copied, but unused buffer is too small + * * all items were found + * Either way, it will stops the loop which iterates to the next + * leaf + * -EOVERFLOW: item was to large for buffer + * -EFAULT: could not copy extent buffer back to userspace + */ return ret; } static noinline int search_ioctl(struct inode *inode, - struct btrfs_ioctl_search_args *args) + struct btrfs_ioctl_search_key *sk, + size_t *buf_size, + char __user *ubuf) { struct btrfs_root *root; struct btrfs_key key; - struct btrfs_key max_key; struct btrfs_path *path; - struct btrfs_ioctl_search_key *sk = &args->key; struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; int ret; int num_found = 0; unsigned long sk_offset = 0; + if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { + *buf_size = sizeof(struct btrfs_ioctl_search_header); + return -EOVERFLOW; + } + path = btrfs_alloc_path(); if (!path) return -ENOMEM; @@ -1149,7 +2106,7 @@ static noinline int search_ioctl(struct inode *inode, key.offset = (u64)-1; root = btrfs_read_fs_root_no_name(info, &key); if (IS_ERR(root)) { - printk(KERN_ERR "could not find root %llu\n", + printk(KERN_ERR "BTRFS: could not find root %llu\n", sk->tree_id); btrfs_free_path(path); return -ENOENT; @@ -1160,28 +2117,24 @@ static noinline int search_ioctl(struct inode *inode, key.type = sk->min_type; key.offset = sk->min_offset; - max_key.objectid = sk->max_objectid; - max_key.type = sk->max_type; - max_key.offset = sk->max_offset; - path->keep_locks = 1; - while(1) { - ret = btrfs_search_forward(root, &key, &max_key, path, 0, - sk->min_transid); + while (1) { + ret = btrfs_search_forward(root, &key, path, sk->min_transid); if (ret != 0) { if (ret > 0) ret = 0; goto err; } - ret = copy_to_sk(root, path, &key, sk, args->buf, + ret = copy_to_sk(root, path, &key, sk, buf_size, ubuf, &sk_offset, &num_found); - btrfs_release_path(root, path); - if (ret || num_found >= sk->nr_items) + btrfs_release_path(path); + if (ret) break; } - ret = 0; + if (ret > 0) + ret = 0; err: sk->nr_items = num_found; btrfs_free_path(path); @@ -1191,22 +2144,73 @@ err: static noinline int btrfs_ioctl_tree_search(struct file *file, void __user *argp) { - struct btrfs_ioctl_search_args *args; - struct inode *inode; - int ret; + struct btrfs_ioctl_search_args __user *uargs; + struct btrfs_ioctl_search_key sk; + struct inode *inode; + int ret; + size_t buf_size; if (!capable(CAP_SYS_ADMIN)) return -EPERM; - args = memdup_user(argp, sizeof(*args)); - if (IS_ERR(args)) - return PTR_ERR(args); + uargs = (struct btrfs_ioctl_search_args __user *)argp; - inode = fdentry(file)->d_inode; - ret = search_ioctl(inode, args); - if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) + if (copy_from_user(&sk, &uargs->key, sizeof(sk))) + return -EFAULT; + + buf_size = sizeof(uargs->buf); + + inode = file_inode(file); + ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); + + /* + * In the origin implementation an overflow is handled by returning a + * search header with a len of zero, so reset ret. + */ + if (ret == -EOVERFLOW) + ret = 0; + + if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) ret = -EFAULT; - kfree(args); + return ret; +} + +static noinline int btrfs_ioctl_tree_search_v2(struct file *file, + void __user *argp) +{ + struct btrfs_ioctl_search_args_v2 __user *uarg; + struct btrfs_ioctl_search_args_v2 args; + struct inode *inode; + int ret; + size_t buf_size; + const size_t buf_limit = 16 * 1024 * 1024; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + /* copy search header and buffer size */ + uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; + if (copy_from_user(&args, uarg, sizeof(args))) + return -EFAULT; + + buf_size = args.buf_size; + + if (buf_size < sizeof(struct btrfs_ioctl_search_header)) + return -EOVERFLOW; + + /* limit result size to 16MB */ + if (buf_size > buf_limit) + buf_size = buf_limit; + + inode = file_inode(file); + ret = search_ioctl(inode, &args.key, &buf_size, + (char *)(&uarg->buf[0])); + if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) + ret = -EFAULT; + else if (ret == -EOVERFLOW && + copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) + ret = -EFAULT; + return ret; } @@ -1244,7 +2248,7 @@ static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, key.offset = (u64)-1; root = btrfs_read_fs_root_no_name(info, &key); if (IS_ERR(root)) { - printk(KERN_ERR "could not find root %llu\n", tree_id); + printk(KERN_ERR "BTRFS: could not find root %llu\n", tree_id); ret = -ENOENT; goto out; } @@ -1253,46 +2257,47 @@ static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, key.type = BTRFS_INODE_REF_KEY; key.offset = (u64)-1; - while(1) { + while (1) { ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); if (ret < 0) goto out; + else if (ret > 0) { + ret = btrfs_previous_item(root, path, dirid, + BTRFS_INODE_REF_KEY); + if (ret < 0) + goto out; + else if (ret > 0) { + ret = -ENOENT; + goto out; + } + } l = path->nodes[0]; slot = path->slots[0]; - if (ret > 0 && slot > 0) - slot--; btrfs_item_key_to_cpu(l, &key, slot); - if (ret > 0 && (key.objectid != dirid || - key.type != BTRFS_INODE_REF_KEY)) { - ret = -ENOENT; - goto out; - } - iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); len = btrfs_inode_ref_name_len(l, iref); ptr -= len + 1; total_len += len + 1; - if (ptr < name) + if (ptr < name) { + ret = -ENAMETOOLONG; goto out; + } *(ptr + len) = '/'; - read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); + read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); if (key.offset == BTRFS_FIRST_FREE_OBJECTID) break; - btrfs_release_path(root, path); + btrfs_release_path(path); key.objectid = key.offset; key.offset = (u64)-1; dirid = key.objectid; - } - if (ptr < name) - goto out; - memcpy(name, ptr, total_len); - name[total_len]='\0'; + memmove(name, ptr, total_len); + name[total_len] = '\0'; ret = 0; out: btrfs_free_path(path); @@ -1313,7 +2318,7 @@ static noinline int btrfs_ioctl_ino_lookup(struct file *file, if (IS_ERR(args)) return PTR_ERR(args); - inode = fdentry(file)->d_inode; + inode = file_inode(file); if (args->treeid == 0) args->treeid = BTRFS_I(inode)->root->root_key.objectid; @@ -1332,7 +2337,7 @@ static noinline int btrfs_ioctl_ino_lookup(struct file *file, static noinline int btrfs_ioctl_snap_destroy(struct file *file, void __user *arg) { - struct dentry *parent = fdentry(file); + struct dentry *parent = file->f_path.dentry; struct dentry *dentry; struct inode *dir = parent->d_inode; struct inode *inode; @@ -1340,6 +2345,9 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file, struct btrfs_root *dest = NULL; struct btrfs_ioctl_vol_args *vol_args; struct btrfs_trans_handle *trans; + struct btrfs_block_rsv block_rsv; + u64 root_flags; + u64 qgroup_reserved; int namelen; int ret; int err = 0; @@ -1356,11 +2364,14 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file, goto out; } - err = mnt_want_write(file->f_path.mnt); + err = mnt_want_write_file(file); if (err) goto out; - mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); + + err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); + if (err == -EINTR) + goto out_drop_write; dentry = lookup_one_len(vol_args->name, parent, namelen); if (IS_ERR(dentry)) { err = PTR_ERR(dentry); @@ -1374,7 +2385,7 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file, inode = dentry->d_inode; dest = BTRFS_I(inode)->root; - if (!capable(CAP_SYS_ADMIN)){ + if (!capable(CAP_SYS_ADMIN)) { /* * Regular user. Only allow this with a special mount * option, when the user has write+exec access to the @@ -1406,19 +2417,40 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file, err = inode_permission(inode, MAY_WRITE | MAY_EXEC); if (err) goto out_dput; - - /* check if subvolume may be deleted by a non-root user */ - err = btrfs_may_delete(dir, dentry, 1); - if (err) - goto out_dput; } - if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { + /* check if subvolume may be deleted by a user */ + err = btrfs_may_delete(dir, dentry, 1); + if (err) + goto out_dput; + + if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { err = -EINVAL; goto out_dput; } mutex_lock(&inode->i_mutex); + + /* + * Don't allow to delete a subvolume with send in progress. This is + * inside the i_mutex so the error handling that has to drop the bit + * again is not run concurrently. + */ + spin_lock(&dest->root_item_lock); + root_flags = btrfs_root_flags(&dest->root_item); + if (dest->send_in_progress == 0) { + btrfs_set_root_flags(&dest->root_item, + root_flags | BTRFS_ROOT_SUBVOL_DEAD); + spin_unlock(&dest->root_item_lock); + } else { + spin_unlock(&dest->root_item_lock); + btrfs_warn(root->fs_info, + "Attempt to delete subvolume %llu during send", + dest->root_key.objectid); + err = -EPERM; + goto out_dput; + } + err = d_invalidate(dentry); if (err) goto out_unlock; @@ -1429,18 +2461,33 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file, if (err) goto out_up_write; + btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); + /* + * One for dir inode, two for dir entries, two for root + * ref/backref. + */ + err = btrfs_subvolume_reserve_metadata(root, &block_rsv, + 5, &qgroup_reserved, true); + if (err) + goto out_up_write; + trans = btrfs_start_transaction(root, 0); if (IS_ERR(trans)) { err = PTR_ERR(trans); - goto out_up_write; + goto out_release; } - trans->block_rsv = &root->fs_info->global_block_rsv; + trans->block_rsv = &block_rsv; + trans->bytes_reserved = block_rsv.size; ret = btrfs_unlink_subvol(trans, root, dir, dest->root_key.objectid, dentry->d_name.name, dentry->d_name.len); - BUG_ON(ret); + if (ret) { + err = ret; + btrfs_abort_transaction(trans, root, ret); + goto out_end_trans; + } btrfs_record_root_in_trans(trans, dest); @@ -1449,30 +2496,75 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file, dest->root_item.drop_level = 0; btrfs_set_root_refs(&dest->root_item, 0); - if (!xchg(&dest->orphan_item_inserted, 1)) { + if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) { ret = btrfs_insert_orphan_item(trans, root->fs_info->tree_root, dest->root_key.objectid); - BUG_ON(ret); + if (ret) { + btrfs_abort_transaction(trans, root, ret); + err = ret; + goto out_end_trans; + } + } + + ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, + dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, + dest->root_key.objectid); + if (ret && ret != -ENOENT) { + btrfs_abort_transaction(trans, root, ret); + err = ret; + goto out_end_trans; + } + if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { + ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, + dest->root_item.received_uuid, + BTRFS_UUID_KEY_RECEIVED_SUBVOL, + dest->root_key.objectid); + if (ret && ret != -ENOENT) { + btrfs_abort_transaction(trans, root, ret); + err = ret; + goto out_end_trans; + } } +out_end_trans: + trans->block_rsv = NULL; + trans->bytes_reserved = 0; ret = btrfs_end_transaction(trans, root); - BUG_ON(ret); + if (ret && !err) + err = ret; inode->i_flags |= S_DEAD; +out_release: + btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); out_up_write: up_write(&root->fs_info->subvol_sem); out_unlock: + if (err) { + spin_lock(&dest->root_item_lock); + root_flags = btrfs_root_flags(&dest->root_item); + btrfs_set_root_flags(&dest->root_item, + root_flags & ~BTRFS_ROOT_SUBVOL_DEAD); + spin_unlock(&dest->root_item_lock); + } mutex_unlock(&inode->i_mutex); if (!err) { shrink_dcache_sb(root->fs_info->sb); btrfs_invalidate_inodes(dest); d_delete(dentry); + ASSERT(dest->send_in_progress == 0); + + /* the last ref */ + if (dest->cache_inode) { + iput(dest->cache_inode); + dest->cache_inode = NULL; + } } out_dput: dput(dentry); out_unlock_dir: mutex_unlock(&dir->i_mutex); - mnt_drop_write(file->f_path.mnt); +out_drop_write: + mnt_drop_write_file(file); out: kfree(vol_args); return err; @@ -1480,25 +2572,30 @@ out: static int btrfs_ioctl_defrag(struct file *file, void __user *argp) { - struct inode *inode = fdentry(file)->d_inode; + struct inode *inode = file_inode(file); struct btrfs_root *root = BTRFS_I(inode)->root; struct btrfs_ioctl_defrag_range_args *range; int ret; - ret = mnt_want_write(file->f_path.mnt); + ret = mnt_want_write_file(file); if (ret) return ret; + if (btrfs_root_readonly(root)) { + ret = -EROFS; + goto out; + } + switch (inode->i_mode & S_IFMT) { case S_IFDIR: if (!capable(CAP_SYS_ADMIN)) { ret = -EPERM; goto out; } - ret = btrfs_defrag_root(root, 0); + ret = btrfs_defrag_root(root); if (ret) goto out; - ret = btrfs_defrag_root(root->fs_info->extent_root, 0); + ret = btrfs_defrag_root(root->fs_info->extent_root); break; case S_IFREG: if (!(file->f_mode & FMODE_WRITE)) { @@ -1528,14 +2625,17 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp) /* the rest are all set to zero by kzalloc */ range->len = (u64)-1; } - ret = btrfs_defrag_file(file, range); + ret = btrfs_defrag_file(file_inode(file), file, + range, 0, 0); + if (ret > 0) + ret = 0; kfree(range); break; default: ret = -EINVAL; } out: - mnt_drop_write(file->f_path.mnt); + mnt_drop_write_file(file); return ret; } @@ -1547,169 +2647,628 @@ static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) if (!capable(CAP_SYS_ADMIN)) return -EPERM; + if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, + 1)) { + return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; + } + + mutex_lock(&root->fs_info->volume_mutex); vol_args = memdup_user(arg, sizeof(*vol_args)); - if (IS_ERR(vol_args)) - return PTR_ERR(vol_args); + if (IS_ERR(vol_args)) { + ret = PTR_ERR(vol_args); + goto out; + } vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; ret = btrfs_init_new_device(root, vol_args->name); kfree(vol_args); +out: + mutex_unlock(&root->fs_info->volume_mutex); + atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); return ret; } -static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) +static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) { + struct btrfs_root *root = BTRFS_I(file_inode(file))->root; struct btrfs_ioctl_vol_args *vol_args; int ret; if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (root->fs_info->sb->s_flags & MS_RDONLY) - return -EROFS; + ret = mnt_want_write_file(file); + if (ret) + return ret; vol_args = memdup_user(arg, sizeof(*vol_args)); - if (IS_ERR(vol_args)) - return PTR_ERR(vol_args); + if (IS_ERR(vol_args)) { + ret = PTR_ERR(vol_args); + goto out; + } vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; + + if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, + 1)) { + ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; + goto out; + } + + mutex_lock(&root->fs_info->volume_mutex); ret = btrfs_rm_device(root, vol_args->name); + mutex_unlock(&root->fs_info->volume_mutex); + atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); +out: kfree(vol_args); + mnt_drop_write_file(file); return ret; } -static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, - u64 off, u64 olen, u64 destoff) +static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) +{ + struct btrfs_ioctl_fs_info_args *fi_args; + struct btrfs_device *device; + struct btrfs_device *next; + struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; + int ret = 0; + + fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); + if (!fi_args) + return -ENOMEM; + + mutex_lock(&fs_devices->device_list_mutex); + fi_args->num_devices = fs_devices->num_devices; + memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); + + list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { + if (device->devid > fi_args->max_id) + fi_args->max_id = device->devid; + } + mutex_unlock(&fs_devices->device_list_mutex); + + fi_args->nodesize = root->fs_info->super_copy->nodesize; + fi_args->sectorsize = root->fs_info->super_copy->sectorsize; + fi_args->clone_alignment = root->fs_info->super_copy->sectorsize; + + if (copy_to_user(arg, fi_args, sizeof(*fi_args))) + ret = -EFAULT; + + kfree(fi_args); + return ret; +} + +static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) +{ + struct btrfs_ioctl_dev_info_args *di_args; + struct btrfs_device *dev; + struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; + int ret = 0; + char *s_uuid = NULL; + + di_args = memdup_user(arg, sizeof(*di_args)); + if (IS_ERR(di_args)) + return PTR_ERR(di_args); + + if (!btrfs_is_empty_uuid(di_args->uuid)) + s_uuid = di_args->uuid; + + mutex_lock(&fs_devices->device_list_mutex); + dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); + + if (!dev) { + ret = -ENODEV; + goto out; + } + + di_args->devid = dev->devid; + di_args->bytes_used = dev->bytes_used; + di_args->total_bytes = dev->total_bytes; + memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); + if (dev->name) { + struct rcu_string *name; + + rcu_read_lock(); + name = rcu_dereference(dev->name); + strncpy(di_args->path, name->str, sizeof(di_args->path)); + rcu_read_unlock(); + di_args->path[sizeof(di_args->path) - 1] = 0; + } else { + di_args->path[0] = '\0'; + } + +out: + mutex_unlock(&fs_devices->device_list_mutex); + if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) + ret = -EFAULT; + + kfree(di_args); + return ret; +} + +static struct page *extent_same_get_page(struct inode *inode, u64 off) +{ + struct page *page; + pgoff_t index; + struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; + + index = off >> PAGE_CACHE_SHIFT; + + page = grab_cache_page(inode->i_mapping, index); + if (!page) + return NULL; + + if (!PageUptodate(page)) { + if (extent_read_full_page_nolock(tree, page, btrfs_get_extent, + 0)) + return NULL; + lock_page(page); + if (!PageUptodate(page)) { + unlock_page(page); + page_cache_release(page); + return NULL; + } + } + unlock_page(page); + + return page; +} + +static inline void lock_extent_range(struct inode *inode, u64 off, u64 len) +{ + /* do any pending delalloc/csum calc on src, one way or + another, and lock file content */ + while (1) { + struct btrfs_ordered_extent *ordered; + lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); + ordered = btrfs_lookup_first_ordered_extent(inode, + off + len - 1); + if ((!ordered || + ordered->file_offset + ordered->len <= off || + ordered->file_offset >= off + len) && + !test_range_bit(&BTRFS_I(inode)->io_tree, off, + off + len - 1, EXTENT_DELALLOC, 0, NULL)) { + if (ordered) + btrfs_put_ordered_extent(ordered); + break; + } + unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); + if (ordered) + btrfs_put_ordered_extent(ordered); + btrfs_wait_ordered_range(inode, off, len); + } +} + +static void btrfs_double_unlock(struct inode *inode1, u64 loff1, + struct inode *inode2, u64 loff2, u64 len) +{ + unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); + unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); + + mutex_unlock(&inode1->i_mutex); + mutex_unlock(&inode2->i_mutex); +} + +static void btrfs_double_lock(struct inode *inode1, u64 loff1, + struct inode *inode2, u64 loff2, u64 len) +{ + if (inode1 < inode2) { + swap(inode1, inode2); + swap(loff1, loff2); + } + + mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); + lock_extent_range(inode1, loff1, len); + if (inode1 != inode2) { + mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); + lock_extent_range(inode2, loff2, len); + } +} + +static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, + u64 dst_loff, u64 len) +{ + int ret = 0; + struct page *src_page, *dst_page; + unsigned int cmp_len = PAGE_CACHE_SIZE; + void *addr, *dst_addr; + + while (len) { + if (len < PAGE_CACHE_SIZE) + cmp_len = len; + + src_page = extent_same_get_page(src, loff); + if (!src_page) + return -EINVAL; + dst_page = extent_same_get_page(dst, dst_loff); + if (!dst_page) { + page_cache_release(src_page); + return -EINVAL; + } + addr = kmap_atomic(src_page); + dst_addr = kmap_atomic(dst_page); + + flush_dcache_page(src_page); + flush_dcache_page(dst_page); + + if (memcmp(addr, dst_addr, cmp_len)) + ret = BTRFS_SAME_DATA_DIFFERS; + + kunmap_atomic(addr); + kunmap_atomic(dst_addr); + page_cache_release(src_page); + page_cache_release(dst_page); + + if (ret) + break; + + loff += cmp_len; + dst_loff += cmp_len; + len -= cmp_len; + } + + return ret; +} + +static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len) +{ + u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; + + if (off + len > inode->i_size || off + len < off) + return -EINVAL; + /* Check that we are block aligned - btrfs_clone() requires this */ + if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) + return -EINVAL; + + return 0; +} + +static int btrfs_extent_same(struct inode *src, u64 loff, u64 len, + struct inode *dst, u64 dst_loff) { - struct inode *inode = fdentry(file)->d_inode; - struct btrfs_root *root = BTRFS_I(inode)->root; - struct file *src_file; - struct inode *src; - struct btrfs_trans_handle *trans; - struct btrfs_path *path; - struct extent_buffer *leaf; - char *buf; - struct btrfs_key key; - u32 nritems; - int slot; int ret; - u64 len = olen; - u64 bs = root->fs_info->sb->s_blocksize; - u64 hint_byte; /* - * TODO: - * - split compressed inline extents. annoying: we need to - * decompress into destination's address_space (the file offset - * may change, so source mapping won't do), then recompress (or - * otherwise reinsert) a subrange. - * - allow ranges within the same file to be cloned (provided - * they don't overlap)? + * btrfs_clone() can't handle extents in the same file + * yet. Once that works, we can drop this check and replace it + * with a check for the same inode, but overlapping extents. */ + if (src == dst) + return -EINVAL; - /* the destination must be opened for writing */ - if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) + btrfs_double_lock(src, loff, dst, dst_loff, len); + + ret = extent_same_check_offsets(src, loff, len); + if (ret) + goto out_unlock; + + ret = extent_same_check_offsets(dst, dst_loff, len); + if (ret) + goto out_unlock; + + /* don't make the dst file partly checksummed */ + if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != + (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { + ret = -EINVAL; + goto out_unlock; + } + + ret = btrfs_cmp_data(src, loff, dst, dst_loff, len); + if (ret == 0) + ret = btrfs_clone(src, dst, loff, len, len, dst_loff); + +out_unlock: + btrfs_double_unlock(src, loff, dst, dst_loff, len); + + return ret; +} + +#define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) + +static long btrfs_ioctl_file_extent_same(struct file *file, + struct btrfs_ioctl_same_args __user *argp) +{ + struct btrfs_ioctl_same_args *same; + struct btrfs_ioctl_same_extent_info *info; + struct inode *src = file_inode(file); + u64 off; + u64 len; + int i; + int ret; + unsigned long size; + u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; + bool is_admin = capable(CAP_SYS_ADMIN); + u16 count; + + if (!(file->f_mode & FMODE_READ)) return -EINVAL; - ret = mnt_want_write(file->f_path.mnt); + ret = mnt_want_write_file(file); if (ret) return ret; - src_file = fget(srcfd); - if (!src_file) { - ret = -EBADF; - goto out_drop_write; + if (get_user(count, &argp->dest_count)) { + ret = -EFAULT; + goto out; } - src = src_file->f_dentry->d_inode; + size = offsetof(struct btrfs_ioctl_same_args __user, info[count]); - ret = -EINVAL; - if (src == inode) - goto out_fput; + same = memdup_user(argp, size); - /* the src must be open for reading */ - if (!(src_file->f_mode & FMODE_READ)) - goto out_fput; + if (IS_ERR(same)) { + ret = PTR_ERR(same); + goto out; + } + + off = same->logical_offset; + len = same->length; + + /* + * Limit the total length we will dedupe for each operation. + * This is intended to bound the total time spent in this + * ioctl to something sane. + */ + if (len > BTRFS_MAX_DEDUPE_LEN) + len = BTRFS_MAX_DEDUPE_LEN; + + if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { + /* + * Btrfs does not support blocksize < page_size. As a + * result, btrfs_cmp_data() won't correctly handle + * this situation without an update. + */ + ret = -EINVAL; + goto out; + } ret = -EISDIR; - if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) - goto out_fput; + if (S_ISDIR(src->i_mode)) + goto out; - ret = -EXDEV; - if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) - goto out_fput; + ret = -EACCES; + if (!S_ISREG(src->i_mode)) + goto out; - ret = -ENOMEM; - buf = vmalloc(btrfs_level_size(root, 0)); - if (!buf) - goto out_fput; + /* pre-format output fields to sane values */ + for (i = 0; i < count; i++) { + same->info[i].bytes_deduped = 0ULL; + same->info[i].status = 0; + } - path = btrfs_alloc_path(); - if (!path) { - vfree(buf); - goto out_fput; + for (i = 0, info = same->info; i < count; i++, info++) { + struct inode *dst; + struct fd dst_file = fdget(info->fd); + if (!dst_file.file) { + info->status = -EBADF; + continue; + } + dst = file_inode(dst_file.file); + + if (!(is_admin || (dst_file.file->f_mode & FMODE_WRITE))) { + info->status = -EINVAL; + } else if (file->f_path.mnt != dst_file.file->f_path.mnt) { + info->status = -EXDEV; + } else if (S_ISDIR(dst->i_mode)) { + info->status = -EISDIR; + } else if (!S_ISREG(dst->i_mode)) { + info->status = -EACCES; + } else { + info->status = btrfs_extent_same(src, off, len, dst, + info->logical_offset); + if (info->status == 0) + info->bytes_deduped += len; + } + fdput(dst_file); } - path->reada = 2; - if (inode < src) { - mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); - mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); - } else { - mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); - mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); + ret = copy_to_user(argp, same, size); + if (ret) + ret = -EFAULT; + +out: + mnt_drop_write_file(file); + return ret; +} + +/* Helper to check and see if this root currently has a ref on the given disk + * bytenr. If it does then we need to update the quota for this root. This + * doesn't do anything if quotas aren't enabled. + */ +static int check_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, + u64 disko) +{ + struct seq_list tree_mod_seq_elem = {}; + struct ulist *roots; + struct ulist_iterator uiter; + struct ulist_node *root_node = NULL; + int ret; + + if (!root->fs_info->quota_enabled) + return 1; + + btrfs_get_tree_mod_seq(root->fs_info, &tree_mod_seq_elem); + ret = btrfs_find_all_roots(trans, root->fs_info, disko, + tree_mod_seq_elem.seq, &roots); + if (ret < 0) + goto out; + ret = 0; + ULIST_ITER_INIT(&uiter); + while ((root_node = ulist_next(roots, &uiter))) { + if (root_node->val == root->objectid) { + ret = 1; + break; + } } + ulist_free(roots); +out: + btrfs_put_tree_mod_seq(root->fs_info, &tree_mod_seq_elem); + return ret; +} - /* determine range to clone */ - ret = -EINVAL; - if (off + len > src->i_size || off + len < off) - goto out_unlock; - if (len == 0) - olen = len = src->i_size - off; - /* if we extend to eof, continue to block boundary */ - if (off + len == src->i_size) - len = ((src->i_size + bs-1) & ~(bs-1)) - - off; +static int clone_finish_inode_update(struct btrfs_trans_handle *trans, + struct inode *inode, + u64 endoff, + const u64 destoff, + const u64 olen) +{ + struct btrfs_root *root = BTRFS_I(inode)->root; + int ret; - /* verify the end result is block aligned */ - if ((off & (bs-1)) || - ((off + len) & (bs-1))) - goto out_unlock; + inode_inc_iversion(inode); + inode->i_mtime = inode->i_ctime = CURRENT_TIME; + /* + * We round up to the block size at eof when determining which + * extents to clone above, but shouldn't round up the file size. + */ + if (endoff > destoff + olen) + endoff = destoff + olen; + if (endoff > inode->i_size) + btrfs_i_size_write(inode, endoff); + + ret = btrfs_update_inode(trans, root, inode); + if (ret) { + btrfs_abort_transaction(trans, root, ret); + btrfs_end_transaction(trans, root); + goto out; + } + ret = btrfs_end_transaction(trans, root); +out: + return ret; +} + +static void clone_update_extent_map(struct inode *inode, + const struct btrfs_trans_handle *trans, + const struct btrfs_path *path, + const u64 hole_offset, + const u64 hole_len) +{ + struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; + struct extent_map *em; + int ret; + + em = alloc_extent_map(); + if (!em) { + set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, + &BTRFS_I(inode)->runtime_flags); + return; + } + + if (path) { + struct btrfs_file_extent_item *fi; + + fi = btrfs_item_ptr(path->nodes[0], path->slots[0], + struct btrfs_file_extent_item); + btrfs_extent_item_to_extent_map(inode, path, fi, false, em); + em->generation = -1; + if (btrfs_file_extent_type(path->nodes[0], fi) == + BTRFS_FILE_EXTENT_INLINE) + set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, + &BTRFS_I(inode)->runtime_flags); + } else { + em->start = hole_offset; + em->len = hole_len; + em->ram_bytes = em->len; + em->orig_start = hole_offset; + em->block_start = EXTENT_MAP_HOLE; + em->block_len = 0; + em->orig_block_len = 0; + em->compress_type = BTRFS_COMPRESS_NONE; + em->generation = trans->transid; + } - /* do any pending delalloc/csum calc on src, one way or - another, and lock file content */ while (1) { - struct btrfs_ordered_extent *ordered; - lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); - ordered = btrfs_lookup_first_ordered_extent(src, off+len); - if (!ordered && - !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len, - EXTENT_DELALLOC, 0, NULL)) + write_lock(&em_tree->lock); + ret = add_extent_mapping(em_tree, em, 1); + write_unlock(&em_tree->lock); + if (ret != -EEXIST) { + free_extent_map(em); break; - unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); - if (ordered) - btrfs_put_ordered_extent(ordered); - btrfs_wait_ordered_range(src, off, len); + } + btrfs_drop_extent_cache(inode, em->start, + em->start + em->len - 1, 0); + } + + if (unlikely(ret)) + set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, + &BTRFS_I(inode)->runtime_flags); +} + +/** + * btrfs_clone() - clone a range from inode file to another + * + * @src: Inode to clone from + * @inode: Inode to clone to + * @off: Offset within source to start clone from + * @olen: Original length, passed by user, of range to clone + * @olen_aligned: Block-aligned value of olen, extent_same uses + * identical values here + * @destoff: Offset within @inode to start clone + */ +static int btrfs_clone(struct inode *src, struct inode *inode, + const u64 off, const u64 olen, const u64 olen_aligned, + const u64 destoff) +{ + struct btrfs_root *root = BTRFS_I(inode)->root; + struct btrfs_path *path = NULL; + struct extent_buffer *leaf; + struct btrfs_trans_handle *trans; + char *buf = NULL; + struct btrfs_key key; + u32 nritems; + int slot; + int ret; + int no_quota; + const u64 len = olen_aligned; + u64 last_disko = 0; + u64 last_dest_end = destoff; + + ret = -ENOMEM; + buf = vmalloc(btrfs_level_size(root, 0)); + if (!buf) + return ret; + + path = btrfs_alloc_path(); + if (!path) { + vfree(buf); + return ret; } + path->reada = 2; /* clone data */ - key.objectid = src->i_ino; + key.objectid = btrfs_ino(src); key.type = BTRFS_EXTENT_DATA_KEY; - key.offset = 0; + key.offset = off; while (1) { /* * note the key will change type as we walk through the * tree. */ - ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); + path->leave_spinning = 1; + ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, + 0, 0); if (ret < 0) goto out; + /* + * First search, if no extent item that starts at offset off was + * found but the previous item is an extent item, it's possible + * it might overlap our target range, therefore process it. + */ + if (key.offset == off && ret > 0 && path->slots[0] > 0) { + btrfs_item_key_to_cpu(path->nodes[0], &key, + path->slots[0] - 1); + if (key.type == BTRFS_EXTENT_DATA_KEY) + path->slots[0]--; + } nritems = btrfs_header_nritems(path->nodes[0]); +process_slot: + no_quota = 1; if (path->slots[0] >= nritems) { - ret = btrfs_next_leaf(root, path); + ret = btrfs_next_leaf(BTRFS_I(src)->root, path); if (ret < 0) goto out; if (ret > 0) @@ -1721,7 +3280,7 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, btrfs_item_key_to_cpu(leaf, &key, slot); if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || - key.objectid != src->i_ino) + key.objectid != btrfs_ino(src)) break; if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { @@ -1732,12 +3291,7 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 disko = 0, diskl = 0; u64 datao = 0, datal = 0; u8 comp; - u64 endoff; - - size = btrfs_item_size_nr(leaf, slot); - read_extent_buffer(leaf, buf, - btrfs_item_ptr_offset(leaf, slot), - size); + u64 drop_start; extent = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); @@ -1757,17 +3311,52 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, datal = btrfs_file_extent_ram_bytes(leaf, extent); } - btrfs_release_path(root, path); - if (key.offset + datal <= off || - key.offset >= off+len) - goto next; + /* + * The first search might have left us at an extent + * item that ends before our target range's start, can + * happen if we have holes and NO_HOLES feature enabled. + */ + if (key.offset + datal <= off) { + path->slots[0]++; + goto process_slot; + } else if (key.offset >= off + len) { + break; + } + + size = btrfs_item_size_nr(leaf, slot); + read_extent_buffer(leaf, buf, + btrfs_item_ptr_offset(leaf, slot), + size); + + btrfs_release_path(path); + path->leave_spinning = 0; memcpy(&new_key, &key, sizeof(new_key)); - new_key.objectid = inode->i_ino; - new_key.offset = key.offset + destoff - off; + new_key.objectid = btrfs_ino(inode); + if (off <= key.offset) + new_key.offset = key.offset + destoff - off; + else + new_key.offset = destoff; - trans = btrfs_start_transaction(root, 1); + /* + * Deal with a hole that doesn't have an extent item + * that represents it (NO_HOLES feature enabled). + * This hole is either in the middle of the cloning + * range or at the beginning (fully overlaps it or + * partially overlaps it). + */ + if (new_key.offset != last_dest_end) + drop_start = last_dest_end; + else + drop_start = new_key.offset; + + /* + * 1 - adjusting old extent (we may have to split it) + * 1 - add new extent + * 1 - inode update + */ + trans = btrfs_start_transaction(root, 3); if (IS_ERR(trans)) { ret = PTR_ERR(trans); goto out; @@ -1775,23 +3364,41 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, if (type == BTRFS_FILE_EXTENT_REG || type == BTRFS_FILE_EXTENT_PREALLOC) { + /* + * a | --- range to clone ---| b + * | ------------- extent ------------- | + */ + + /* subtract range b */ + if (key.offset + datal > off + len) + datal = off + len - key.offset; + + /* subtract range a */ if (off > key.offset) { datao += off - key.offset; datal -= off - key.offset; } - if (key.offset + datal > off + len) - datal = off + len - key.offset; - - ret = btrfs_drop_extents(trans, inode, - new_key.offset, + ret = btrfs_drop_extents(trans, root, inode, + drop_start, new_key.offset + datal, - &hint_byte, 1); - BUG_ON(ret); + 1); + if (ret) { + if (ret != -EOPNOTSUPP) + btrfs_abort_transaction(trans, + root, ret); + btrfs_end_transaction(trans, root); + goto out; + } ret = btrfs_insert_empty_item(trans, root, path, &new_key, size); - BUG_ON(ret); + if (ret) { + btrfs_abort_transaction(trans, root, + ret); + btrfs_end_transaction(trans, root); + goto out; + } leaf = path->nodes[0]; slot = path->slots[0]; @@ -1810,25 +3417,58 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, datao); btrfs_set_file_extent_num_bytes(leaf, extent, datal); + + /* + * We need to look up the roots that point at + * this bytenr and see if the new root does. If + * it does not we need to make sure we update + * quotas appropriately. + */ + if (disko && root != BTRFS_I(src)->root && + disko != last_disko) { + no_quota = check_ref(trans, root, + disko); + if (no_quota < 0) { + btrfs_abort_transaction(trans, + root, + ret); + btrfs_end_transaction(trans, + root); + ret = no_quota; + goto out; + } + } + if (disko) { inode_add_bytes(inode, datal); ret = btrfs_inc_extent_ref(trans, root, disko, diskl, 0, root->root_key.objectid, - inode->i_ino, - new_key.offset - datao); - BUG_ON(ret); + btrfs_ino(inode), + new_key.offset - datao, + no_quota); + if (ret) { + btrfs_abort_transaction(trans, + root, + ret); + btrfs_end_transaction(trans, + root); + goto out; + + } } } else if (type == BTRFS_FILE_EXTENT_INLINE) { u64 skip = 0; u64 trim = 0; + u64 aligned_end = 0; + if (off > key.offset) { skip = off - key.offset; new_key.offset += skip; } - if (key.offset + datal > off+len) - trim = key.offset + datal - (off+len); + if (key.offset + datal > off + len) + trim = key.offset + datal - (off + len); if (comp && (skip || trim)) { ret = -EINVAL; @@ -1838,15 +3478,28 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, size -= skip + trim; datal -= skip + trim; - ret = btrfs_drop_extents(trans, inode, - new_key.offset, - new_key.offset + datal, - &hint_byte, 1); - BUG_ON(ret); + aligned_end = ALIGN(new_key.offset + datal, + root->sectorsize); + ret = btrfs_drop_extents(trans, root, inode, + drop_start, + aligned_end, + 1); + if (ret) { + if (ret != -EOPNOTSUPP) + btrfs_abort_transaction(trans, + root, ret); + btrfs_end_transaction(trans, root); + goto out; + } ret = btrfs_insert_empty_item(trans, root, path, &new_key, size); - BUG_ON(ret); + if (ret) { + btrfs_abort_transaction(trans, root, + ret); + btrfs_end_transaction(trans, root); + goto out; + } if (skip) { u32 start = @@ -1863,44 +3516,224 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, inode_add_bytes(inode, datal); } - btrfs_mark_buffer_dirty(leaf); - btrfs_release_path(root, path); + /* If we have an implicit hole (NO_HOLES feature). */ + if (drop_start < new_key.offset) + clone_update_extent_map(inode, trans, + NULL, drop_start, + new_key.offset - drop_start); - inode->i_mtime = inode->i_ctime = CURRENT_TIME; + clone_update_extent_map(inode, trans, path, 0, 0); - /* - * we round up to the block size at eof when - * determining which extents to clone above, - * but shouldn't round up the file size - */ - endoff = new_key.offset + datal; - if (endoff > off+olen) - endoff = off+olen; - if (endoff > inode->i_size) - btrfs_i_size_write(inode, endoff); - - BTRFS_I(inode)->flags = BTRFS_I(src)->flags; - ret = btrfs_update_inode(trans, root, inode); - BUG_ON(ret); - btrfs_end_transaction(trans, root); + btrfs_mark_buffer_dirty(leaf); + btrfs_release_path(path); + + last_dest_end = new_key.offset + datal; + ret = clone_finish_inode_update(trans, inode, + last_dest_end, + destoff, olen); + if (ret) + goto out; + if (new_key.offset + datal >= destoff + len) + break; } -next: - btrfs_release_path(root, path); + btrfs_release_path(path); key.offset++; } ret = 0; + + if (last_dest_end < destoff + len) { + /* + * We have an implicit hole (NO_HOLES feature is enabled) that + * fully or partially overlaps our cloning range at its end. + */ + btrfs_release_path(path); + + /* + * 1 - remove extent(s) + * 1 - inode update + */ + trans = btrfs_start_transaction(root, 2); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + goto out; + } + ret = btrfs_drop_extents(trans, root, inode, + last_dest_end, destoff + len, 1); + if (ret) { + if (ret != -EOPNOTSUPP) + btrfs_abort_transaction(trans, root, ret); + btrfs_end_transaction(trans, root); + goto out; + } + clone_update_extent_map(inode, trans, NULL, last_dest_end, + destoff + len - last_dest_end); + ret = clone_finish_inode_update(trans, inode, destoff + len, + destoff, olen); + } + out: - btrfs_release_path(root, path); - unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); -out_unlock: - mutex_unlock(&src->i_mutex); - mutex_unlock(&inode->i_mutex); - vfree(buf); btrfs_free_path(path); + vfree(buf); + return ret; +} + +static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, + u64 off, u64 olen, u64 destoff) +{ + struct inode *inode = file_inode(file); + struct btrfs_root *root = BTRFS_I(inode)->root; + struct fd src_file; + struct inode *src; + int ret; + u64 len = olen; + u64 bs = root->fs_info->sb->s_blocksize; + int same_inode = 0; + + /* + * TODO: + * - split compressed inline extents. annoying: we need to + * decompress into destination's address_space (the file offset + * may change, so source mapping won't do), then recompress (or + * otherwise reinsert) a subrange. + * + * - split destination inode's inline extents. The inline extents can + * be either compressed or non-compressed. + */ + + /* the destination must be opened for writing */ + if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) + return -EINVAL; + + if (btrfs_root_readonly(root)) + return -EROFS; + + ret = mnt_want_write_file(file); + if (ret) + return ret; + + src_file = fdget(srcfd); + if (!src_file.file) { + ret = -EBADF; + goto out_drop_write; + } + + ret = -EXDEV; + if (src_file.file->f_path.mnt != file->f_path.mnt) + goto out_fput; + + src = file_inode(src_file.file); + + ret = -EINVAL; + if (src == inode) + same_inode = 1; + + /* the src must be open for reading */ + if (!(src_file.file->f_mode & FMODE_READ)) + goto out_fput; + + /* don't make the dst file partly checksummed */ + if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != + (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) + goto out_fput; + + ret = -EISDIR; + if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) + goto out_fput; + + ret = -EXDEV; + if (src->i_sb != inode->i_sb) + goto out_fput; + + if (!same_inode) { + if (inode < src) { + mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); + mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); + } else { + mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); + mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); + } + } else { + mutex_lock(&src->i_mutex); + } + + /* determine range to clone */ + ret = -EINVAL; + if (off + len > src->i_size || off + len < off) + goto out_unlock; + if (len == 0) + olen = len = src->i_size - off; + /* if we extend to eof, continue to block boundary */ + if (off + len == src->i_size) + len = ALIGN(src->i_size, bs) - off; + + /* verify the end result is block aligned */ + if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || + !IS_ALIGNED(destoff, bs)) + goto out_unlock; + + /* verify if ranges are overlapped within the same file */ + if (same_inode) { + if (destoff + len > off && destoff < off + len) + goto out_unlock; + } + + if (destoff > inode->i_size) { + ret = btrfs_cont_expand(inode, inode->i_size, destoff); + if (ret) + goto out_unlock; + } + + /* + * Lock the target range too. Right after we replace the file extent + * items in the fs tree (which now point to the cloned data), we might + * have a worker replace them with extent items relative to a write + * operation that was issued before this clone operation (i.e. confront + * with inode.c:btrfs_finish_ordered_io). + */ + if (same_inode) { + u64 lock_start = min_t(u64, off, destoff); + u64 lock_len = max_t(u64, off, destoff) + len - lock_start; + + lock_extent_range(src, lock_start, lock_len); + } else { + lock_extent_range(src, off, len); + lock_extent_range(inode, destoff, len); + } + + ret = btrfs_clone(src, inode, off, olen, len, destoff); + + if (same_inode) { + u64 lock_start = min_t(u64, off, destoff); + u64 lock_end = max_t(u64, off, destoff) + len - 1; + + unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end); + } else { + unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); + unlock_extent(&BTRFS_I(inode)->io_tree, destoff, + destoff + len - 1); + } + /* + * Truncate page cache pages so that future reads will see the cloned + * data immediately and not the previous data. + */ + truncate_inode_pages_range(&inode->i_data, destoff, + PAGE_CACHE_ALIGN(destoff + len) - 1); +out_unlock: + if (!same_inode) { + if (inode < src) { + mutex_unlock(&src->i_mutex); + mutex_unlock(&inode->i_mutex); + } else { + mutex_unlock(&inode->i_mutex); + mutex_unlock(&src->i_mutex); + } + } else { + mutex_unlock(&src->i_mutex); + } out_fput: - fput(src_file); + fdput(src_file); out_drop_write: - mnt_drop_write(file->f_path.mnt); + mnt_drop_write_file(file); return ret; } @@ -1922,7 +3755,7 @@ static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) */ static long btrfs_ioctl_trans_start(struct file *file) { - struct inode *inode = fdentry(file)->d_inode; + struct inode *inode = file_inode(file); struct btrfs_root *root = BTRFS_I(inode)->root; struct btrfs_trans_handle *trans; int ret; @@ -1935,34 +3768,34 @@ static long btrfs_ioctl_trans_start(struct file *file) if (file->private_data) goto out; - ret = mnt_want_write(file->f_path.mnt); + ret = -EROFS; + if (btrfs_root_readonly(root)) + goto out; + + ret = mnt_want_write_file(file); if (ret) goto out; - mutex_lock(&root->fs_info->trans_mutex); - root->fs_info->open_ioctl_trans++; - mutex_unlock(&root->fs_info->trans_mutex); + atomic_inc(&root->fs_info->open_ioctl_trans); ret = -ENOMEM; - trans = btrfs_start_ioctl_transaction(root, 0); - if (!trans) + trans = btrfs_start_ioctl_transaction(root); + if (IS_ERR(trans)) goto out_drop; file->private_data = trans; return 0; out_drop: - mutex_lock(&root->fs_info->trans_mutex); - root->fs_info->open_ioctl_trans--; - mutex_unlock(&root->fs_info->trans_mutex); - mnt_drop_write(file->f_path.mnt); + atomic_dec(&root->fs_info->open_ioctl_trans); + mnt_drop_write_file(file); out: return ret; } static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) { - struct inode *inode = fdentry(file)->d_inode; + struct inode *inode = file_inode(file); struct btrfs_root *root = BTRFS_I(inode)->root; struct btrfs_root *new_root; struct btrfs_dir_item *di; @@ -1970,51 +3803,59 @@ static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) struct btrfs_path *path; struct btrfs_key location; struct btrfs_disk_key disk_key; - struct btrfs_super_block *disk_super; - u64 features; u64 objectid = 0; u64 dir_id; + int ret; if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (copy_from_user(&objectid, argp, sizeof(objectid))) - return -EFAULT; + ret = mnt_want_write_file(file); + if (ret) + return ret; + + if (copy_from_user(&objectid, argp, sizeof(objectid))) { + ret = -EFAULT; + goto out; + } if (!objectid) - objectid = root->root_key.objectid; + objectid = BTRFS_FS_TREE_OBJECTID; location.objectid = objectid; location.type = BTRFS_ROOT_ITEM_KEY; location.offset = (u64)-1; new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); - if (IS_ERR(new_root)) - return PTR_ERR(new_root); - - if (btrfs_root_refs(&new_root->root_item) == 0) - return -ENOENT; + if (IS_ERR(new_root)) { + ret = PTR_ERR(new_root); + goto out; + } path = btrfs_alloc_path(); - if (!path) - return -ENOMEM; + if (!path) { + ret = -ENOMEM; + goto out; + } path->leave_spinning = 1; trans = btrfs_start_transaction(root, 1); - if (!trans) { + if (IS_ERR(trans)) { btrfs_free_path(path); - return -ENOMEM; + ret = PTR_ERR(trans); + goto out; } - dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); + dir_id = btrfs_super_root_dir(root->fs_info->super_copy); di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, dir_id, "default", 7, 1); if (IS_ERR_OR_NULL(di)) { btrfs_free_path(path); btrfs_end_transaction(trans, root); - printk(KERN_ERR "Umm, you don't have the default dir item, " - "this isn't going to work\n"); - return -ENOENT; + btrfs_err(new_root->fs_info, "Umm, you don't have the default dir" + "item, this isn't going to work"); + ret = -ENOENT; + goto out; } btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); @@ -2022,19 +3863,15 @@ static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) btrfs_mark_buffer_dirty(path->nodes[0]); btrfs_free_path(path); - disk_super = &root->fs_info->super_copy; - features = btrfs_super_incompat_flags(disk_super); - if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { - features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; - btrfs_set_super_incompat_flags(disk_super, features); - } + btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); btrfs_end_transaction(trans, root); - - return 0; +out: + mnt_drop_write_file(file); + return ret; } -static void get_block_group_info(struct list_head *groups_list, - struct btrfs_ioctl_space_info *space) +void btrfs_get_block_group_info(struct list_head *groups_list, + struct btrfs_ioctl_space_info *space) { struct btrfs_block_group_cache *block_group; @@ -2049,13 +3886,13 @@ static void get_block_group_info(struct list_head *groups_list, } } -long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) +static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) { struct btrfs_ioctl_space_args space_args; struct btrfs_ioctl_space_info space; struct btrfs_ioctl_space_info *dest; struct btrfs_ioctl_space_info *dest_orig; - struct btrfs_ioctl_space_info *user_dest; + struct btrfs_ioctl_space_info __user *user_dest; struct btrfs_space_info *info; u64 types[] = {BTRFS_BLOCK_GROUP_DATA, BTRFS_BLOCK_GROUP_SYSTEM, @@ -2064,7 +3901,7 @@ long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) int num_types = 4; int alloc_size; int ret = 0; - int slot_count = 0; + u64 slot_count = 0; int i, c; if (copy_from_user(&space_args, @@ -2097,13 +3934,18 @@ long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) up_read(&info->groups_sem); } + /* + * Global block reserve, exported as a space_info + */ + slot_count++; + /* space_slots == 0 means they are asking for a count */ if (space_args.space_slots == 0) { space_args.total_spaces = slot_count; goto out; } - slot_count = min_t(int, space_args.space_slots, slot_count); + slot_count = min_t(u64, space_args.space_slots, slot_count); alloc_size = sizeof(*dest) * slot_count; @@ -2123,6 +3965,9 @@ long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) for (i = 0; i < num_types; i++) { struct btrfs_space_info *tmp; + if (!slot_count) + break; + info = NULL; rcu_read_lock(); list_for_each_entry_rcu(tmp, &root->fs_info->space_info, @@ -2139,17 +3984,35 @@ long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) down_read(&info->groups_sem); for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { if (!list_empty(&info->block_groups[c])) { - get_block_group_info(&info->block_groups[c], - &space); + btrfs_get_block_group_info( + &info->block_groups[c], &space); memcpy(dest, &space, sizeof(space)); dest++; space_args.total_spaces++; + slot_count--; } + if (!slot_count) + break; } up_read(&info->groups_sem); } - user_dest = (struct btrfs_ioctl_space_info *) + /* + * Add global block reserve + */ + if (slot_count) { + struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv; + + spin_lock(&block_rsv->lock); + space.total_bytes = block_rsv->size; + space.used_bytes = block_rsv->size - block_rsv->reserved; + spin_unlock(&block_rsv->lock); + space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; + memcpy(dest, &space, sizeof(space)); + space_args.total_spaces++; + } + + user_dest = (struct btrfs_ioctl_space_info __user *) (arg + sizeof(struct btrfs_ioctl_space_args)); if (copy_to_user(user_dest, dest_orig, alloc_size)) @@ -2171,7 +4034,7 @@ out: */ long btrfs_ioctl_trans_end(struct file *file) { - struct inode *inode = fdentry(file)->d_inode; + struct inode *inode = file_inode(file); struct btrfs_root *root = BTRFS_I(inode)->root; struct btrfs_trans_handle *trans; @@ -2182,33 +4045,44 @@ long btrfs_ioctl_trans_end(struct file *file) btrfs_end_transaction(trans, root); - mutex_lock(&root->fs_info->trans_mutex); - root->fs_info->open_ioctl_trans--; - mutex_unlock(&root->fs_info->trans_mutex); + atomic_dec(&root->fs_info->open_ioctl_trans); - mnt_drop_write(file->f_path.mnt); + mnt_drop_write_file(file); return 0; } -static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) +static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, + void __user *argp) { - struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; struct btrfs_trans_handle *trans; u64 transid; + int ret; - trans = btrfs_start_transaction(root, 0); - transid = trans->transid; - btrfs_commit_transaction_async(trans, root, 0); + trans = btrfs_attach_transaction_barrier(root); + if (IS_ERR(trans)) { + if (PTR_ERR(trans) != -ENOENT) + return PTR_ERR(trans); + /* No running transaction, don't bother */ + transid = root->fs_info->last_trans_committed; + goto out; + } + transid = trans->transid; + ret = btrfs_commit_transaction_async(trans, root, 0); + if (ret) { + btrfs_end_transaction(trans, root); + return ret; + } +out: if (argp) if (copy_to_user(argp, &transid, sizeof(transid))) return -EFAULT; return 0; } -static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) +static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, + void __user *argp) { - struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; u64 transid; if (argp) { @@ -2220,10 +4094,1151 @@ static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) return btrfs_wait_for_commit(root, transid); } +static long btrfs_ioctl_scrub(struct file *file, void __user *arg) +{ + struct btrfs_root *root = BTRFS_I(file_inode(file))->root; + struct btrfs_ioctl_scrub_args *sa; + int ret; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + sa = memdup_user(arg, sizeof(*sa)); + if (IS_ERR(sa)) + return PTR_ERR(sa); + + if (!(sa->flags & BTRFS_SCRUB_READONLY)) { + ret = mnt_want_write_file(file); + if (ret) + goto out; + } + + ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, + &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, + 0); + + if (copy_to_user(arg, sa, sizeof(*sa))) + ret = -EFAULT; + + if (!(sa->flags & BTRFS_SCRUB_READONLY)) + mnt_drop_write_file(file); +out: + kfree(sa); + return ret; +} + +static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) +{ + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + return btrfs_scrub_cancel(root->fs_info); +} + +static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, + void __user *arg) +{ + struct btrfs_ioctl_scrub_args *sa; + int ret; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + sa = memdup_user(arg, sizeof(*sa)); + if (IS_ERR(sa)) + return PTR_ERR(sa); + + ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); + + if (copy_to_user(arg, sa, sizeof(*sa))) + ret = -EFAULT; + + kfree(sa); + return ret; +} + +static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, + void __user *arg) +{ + struct btrfs_ioctl_get_dev_stats *sa; + int ret; + + sa = memdup_user(arg, sizeof(*sa)); + if (IS_ERR(sa)) + return PTR_ERR(sa); + + if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { + kfree(sa); + return -EPERM; + } + + ret = btrfs_get_dev_stats(root, sa); + + if (copy_to_user(arg, sa, sizeof(*sa))) + ret = -EFAULT; + + kfree(sa); + return ret; +} + +static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) +{ + struct btrfs_ioctl_dev_replace_args *p; + int ret; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + p = memdup_user(arg, sizeof(*p)); + if (IS_ERR(p)) + return PTR_ERR(p); + + switch (p->cmd) { + case BTRFS_IOCTL_DEV_REPLACE_CMD_START: + if (root->fs_info->sb->s_flags & MS_RDONLY) { + ret = -EROFS; + goto out; + } + if (atomic_xchg( + &root->fs_info->mutually_exclusive_operation_running, + 1)) { + ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; + } else { + ret = btrfs_dev_replace_start(root, p); + atomic_set( + &root->fs_info->mutually_exclusive_operation_running, + 0); + } + break; + case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: + btrfs_dev_replace_status(root->fs_info, p); + ret = 0; + break; + case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: + ret = btrfs_dev_replace_cancel(root->fs_info, p); + break; + default: + ret = -EINVAL; + break; + } + + if (copy_to_user(arg, p, sizeof(*p))) + ret = -EFAULT; +out: + kfree(p); + return ret; +} + +static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) +{ + int ret = 0; + int i; + u64 rel_ptr; + int size; + struct btrfs_ioctl_ino_path_args *ipa = NULL; + struct inode_fs_paths *ipath = NULL; + struct btrfs_path *path; + + if (!capable(CAP_DAC_READ_SEARCH)) + return -EPERM; + + path = btrfs_alloc_path(); + if (!path) { + ret = -ENOMEM; + goto out; + } + + ipa = memdup_user(arg, sizeof(*ipa)); + if (IS_ERR(ipa)) { + ret = PTR_ERR(ipa); + ipa = NULL; + goto out; + } + + size = min_t(u32, ipa->size, 4096); + ipath = init_ipath(size, root, path); + if (IS_ERR(ipath)) { + ret = PTR_ERR(ipath); + ipath = NULL; + goto out; + } + + ret = paths_from_inode(ipa->inum, ipath); + if (ret < 0) + goto out; + + for (i = 0; i < ipath->fspath->elem_cnt; ++i) { + rel_ptr = ipath->fspath->val[i] - + (u64)(unsigned long)ipath->fspath->val; + ipath->fspath->val[i] = rel_ptr; + } + + ret = copy_to_user((void *)(unsigned long)ipa->fspath, + (void *)(unsigned long)ipath->fspath, size); + if (ret) { + ret = -EFAULT; + goto out; + } + +out: + btrfs_free_path(path); + free_ipath(ipath); + kfree(ipa); + + return ret; +} + +static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) +{ + struct btrfs_data_container *inodes = ctx; + const size_t c = 3 * sizeof(u64); + + if (inodes->bytes_left >= c) { + inodes->bytes_left -= c; + inodes->val[inodes->elem_cnt] = inum; + inodes->val[inodes->elem_cnt + 1] = offset; + inodes->val[inodes->elem_cnt + 2] = root; + inodes->elem_cnt += 3; + } else { + inodes->bytes_missing += c - inodes->bytes_left; + inodes->bytes_left = 0; + inodes->elem_missed += 3; + } + + return 0; +} + +static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, + void __user *arg) +{ + int ret = 0; + int size; + struct btrfs_ioctl_logical_ino_args *loi; + struct btrfs_data_container *inodes = NULL; + struct btrfs_path *path = NULL; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + loi = memdup_user(arg, sizeof(*loi)); + if (IS_ERR(loi)) { + ret = PTR_ERR(loi); + loi = NULL; + goto out; + } + + path = btrfs_alloc_path(); + if (!path) { + ret = -ENOMEM; + goto out; + } + + size = min_t(u32, loi->size, 64 * 1024); + inodes = init_data_container(size); + if (IS_ERR(inodes)) { + ret = PTR_ERR(inodes); + inodes = NULL; + goto out; + } + + ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, + build_ino_list, inodes); + if (ret == -EINVAL) + ret = -ENOENT; + if (ret < 0) + goto out; + + ret = copy_to_user((void *)(unsigned long)loi->inodes, + (void *)(unsigned long)inodes, size); + if (ret) + ret = -EFAULT; + +out: + btrfs_free_path(path); + vfree(inodes); + kfree(loi); + + return ret; +} + +void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, + struct btrfs_ioctl_balance_args *bargs) +{ + struct btrfs_balance_control *bctl = fs_info->balance_ctl; + + bargs->flags = bctl->flags; + + if (atomic_read(&fs_info->balance_running)) + bargs->state |= BTRFS_BALANCE_STATE_RUNNING; + if (atomic_read(&fs_info->balance_pause_req)) + bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; + if (atomic_read(&fs_info->balance_cancel_req)) + bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; + + memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); + memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); + memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); + + if (lock) { + spin_lock(&fs_info->balance_lock); + memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); + spin_unlock(&fs_info->balance_lock); + } else { + memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); + } +} + +static long btrfs_ioctl_balance(struct file *file, void __user *arg) +{ + struct btrfs_root *root = BTRFS_I(file_inode(file))->root; + struct btrfs_fs_info *fs_info = root->fs_info; + struct btrfs_ioctl_balance_args *bargs; + struct btrfs_balance_control *bctl; + bool need_unlock; /* for mut. excl. ops lock */ + int ret; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + ret = mnt_want_write_file(file); + if (ret) + return ret; + +again: + if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { + mutex_lock(&fs_info->volume_mutex); + mutex_lock(&fs_info->balance_mutex); + need_unlock = true; + goto locked; + } + + /* + * mut. excl. ops lock is locked. Three possibilites: + * (1) some other op is running + * (2) balance is running + * (3) balance is paused -- special case (think resume) + */ + mutex_lock(&fs_info->balance_mutex); + if (fs_info->balance_ctl) { + /* this is either (2) or (3) */ + if (!atomic_read(&fs_info->balance_running)) { + mutex_unlock(&fs_info->balance_mutex); + if (!mutex_trylock(&fs_info->volume_mutex)) + goto again; + mutex_lock(&fs_info->balance_mutex); + + if (fs_info->balance_ctl && + !atomic_read(&fs_info->balance_running)) { + /* this is (3) */ + need_unlock = false; + goto locked; + } + + mutex_unlock(&fs_info->balance_mutex); + mutex_unlock(&fs_info->volume_mutex); + goto again; + } else { + /* this is (2) */ + mutex_unlock(&fs_info->balance_mutex); + ret = -EINPROGRESS; + goto out; + } + } else { + /* this is (1) */ + mutex_unlock(&fs_info->balance_mutex); + ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; + goto out; + } + +locked: + BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); + + if (arg) { + bargs = memdup_user(arg, sizeof(*bargs)); + if (IS_ERR(bargs)) { + ret = PTR_ERR(bargs); + goto out_unlock; + } + + if (bargs->flags & BTRFS_BALANCE_RESUME) { + if (!fs_info->balance_ctl) { + ret = -ENOTCONN; + goto out_bargs; + } + + bctl = fs_info->balance_ctl; + spin_lock(&fs_info->balance_lock); + bctl->flags |= BTRFS_BALANCE_RESUME; + spin_unlock(&fs_info->balance_lock); + + goto do_balance; + } + } else { + bargs = NULL; + } + + if (fs_info->balance_ctl) { + ret = -EINPROGRESS; + goto out_bargs; + } + + bctl = kzalloc(sizeof(*bctl), GFP_NOFS); + if (!bctl) { + ret = -ENOMEM; + goto out_bargs; + } + + bctl->fs_info = fs_info; + if (arg) { + memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); + memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); + memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); + + bctl->flags = bargs->flags; + } else { + /* balance everything - no filters */ + bctl->flags |= BTRFS_BALANCE_TYPE_MASK; + } + +do_balance: + /* + * Ownership of bctl and mutually_exclusive_operation_running + * goes to to btrfs_balance. bctl is freed in __cancel_balance, + * or, if restriper was paused all the way until unmount, in + * free_fs_info. mutually_exclusive_operation_running is + * cleared in __cancel_balance. + */ + need_unlock = false; + + ret = btrfs_balance(bctl, bargs); + + if (arg) { + if (copy_to_user(arg, bargs, sizeof(*bargs))) + ret = -EFAULT; + } + +out_bargs: + kfree(bargs); +out_unlock: + mutex_unlock(&fs_info->balance_mutex); + mutex_unlock(&fs_info->volume_mutex); + if (need_unlock) + atomic_set(&fs_info->mutually_exclusive_operation_running, 0); +out: + mnt_drop_write_file(file); + return ret; +} + +static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) +{ + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + switch (cmd) { + case BTRFS_BALANCE_CTL_PAUSE: + return btrfs_pause_balance(root->fs_info); + case BTRFS_BALANCE_CTL_CANCEL: + return btrfs_cancel_balance(root->fs_info); + } + + return -EINVAL; +} + +static long btrfs_ioctl_balance_progress(struct btrfs_root *root, + void __user *arg) +{ + struct btrfs_fs_info *fs_info = root->fs_info; + struct btrfs_ioctl_balance_args *bargs; + int ret = 0; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + mutex_lock(&fs_info->balance_mutex); + if (!fs_info->balance_ctl) { + ret = -ENOTCONN; + goto out; + } + + bargs = kzalloc(sizeof(*bargs), GFP_NOFS); + if (!bargs) { + ret = -ENOMEM; + goto out; + } + + update_ioctl_balance_args(fs_info, 1, bargs); + + if (copy_to_user(arg, bargs, sizeof(*bargs))) + ret = -EFAULT; + + kfree(bargs); +out: + mutex_unlock(&fs_info->balance_mutex); + return ret; +} + +static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) +{ + struct btrfs_root *root = BTRFS_I(file_inode(file))->root; + struct btrfs_ioctl_quota_ctl_args *sa; + struct btrfs_trans_handle *trans = NULL; + int ret; + int err; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + ret = mnt_want_write_file(file); + if (ret) + return ret; + + sa = memdup_user(arg, sizeof(*sa)); + if (IS_ERR(sa)) { + ret = PTR_ERR(sa); + goto drop_write; + } + + down_write(&root->fs_info->subvol_sem); + trans = btrfs_start_transaction(root->fs_info->tree_root, 2); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + goto out; + } + + switch (sa->cmd) { + case BTRFS_QUOTA_CTL_ENABLE: + ret = btrfs_quota_enable(trans, root->fs_info); + break; + case BTRFS_QUOTA_CTL_DISABLE: + ret = btrfs_quota_disable(trans, root->fs_info); + break; + default: + ret = -EINVAL; + break; + } + + err = btrfs_commit_transaction(trans, root->fs_info->tree_root); + if (err && !ret) + ret = err; +out: + kfree(sa); + up_write(&root->fs_info->subvol_sem); +drop_write: + mnt_drop_write_file(file); + return ret; +} + +static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) +{ + struct btrfs_root *root = BTRFS_I(file_inode(file))->root; + struct btrfs_ioctl_qgroup_assign_args *sa; + struct btrfs_trans_handle *trans; + int ret; + int err; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + ret = mnt_want_write_file(file); + if (ret) + return ret; + + sa = memdup_user(arg, sizeof(*sa)); + if (IS_ERR(sa)) { + ret = PTR_ERR(sa); + goto drop_write; + } + + trans = btrfs_join_transaction(root); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + goto out; + } + + /* FIXME: check if the IDs really exist */ + if (sa->assign) { + ret = btrfs_add_qgroup_relation(trans, root->fs_info, + sa->src, sa->dst); + } else { + ret = btrfs_del_qgroup_relation(trans, root->fs_info, + sa->src, sa->dst); + } + + err = btrfs_end_transaction(trans, root); + if (err && !ret) + ret = err; + +out: + kfree(sa); +drop_write: + mnt_drop_write_file(file); + return ret; +} + +static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) +{ + struct btrfs_root *root = BTRFS_I(file_inode(file))->root; + struct btrfs_ioctl_qgroup_create_args *sa; + struct btrfs_trans_handle *trans; + int ret; + int err; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + ret = mnt_want_write_file(file); + if (ret) + return ret; + + sa = memdup_user(arg, sizeof(*sa)); + if (IS_ERR(sa)) { + ret = PTR_ERR(sa); + goto drop_write; + } + + if (!sa->qgroupid) { + ret = -EINVAL; + goto out; + } + + trans = btrfs_join_transaction(root); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + goto out; + } + + /* FIXME: check if the IDs really exist */ + if (sa->create) { + ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, + NULL); + } else { + ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); + } + + err = btrfs_end_transaction(trans, root); + if (err && !ret) + ret = err; + +out: + kfree(sa); +drop_write: + mnt_drop_write_file(file); + return ret; +} + +static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) +{ + struct btrfs_root *root = BTRFS_I(file_inode(file))->root; + struct btrfs_ioctl_qgroup_limit_args *sa; + struct btrfs_trans_handle *trans; + int ret; + int err; + u64 qgroupid; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + ret = mnt_want_write_file(file); + if (ret) + return ret; + + sa = memdup_user(arg, sizeof(*sa)); + if (IS_ERR(sa)) { + ret = PTR_ERR(sa); + goto drop_write; + } + + trans = btrfs_join_transaction(root); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + goto out; + } + + qgroupid = sa->qgroupid; + if (!qgroupid) { + /* take the current subvol as qgroup */ + qgroupid = root->root_key.objectid; + } + + /* FIXME: check if the IDs really exist */ + ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); + + err = btrfs_end_transaction(trans, root); + if (err && !ret) + ret = err; + +out: + kfree(sa); +drop_write: + mnt_drop_write_file(file); + return ret; +} + +static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) +{ + struct btrfs_root *root = BTRFS_I(file_inode(file))->root; + struct btrfs_ioctl_quota_rescan_args *qsa; + int ret; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + ret = mnt_want_write_file(file); + if (ret) + return ret; + + qsa = memdup_user(arg, sizeof(*qsa)); + if (IS_ERR(qsa)) { + ret = PTR_ERR(qsa); + goto drop_write; + } + + if (qsa->flags) { + ret = -EINVAL; + goto out; + } + + ret = btrfs_qgroup_rescan(root->fs_info); + +out: + kfree(qsa); +drop_write: + mnt_drop_write_file(file); + return ret; +} + +static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) +{ + struct btrfs_root *root = BTRFS_I(file_inode(file))->root; + struct btrfs_ioctl_quota_rescan_args *qsa; + int ret = 0; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + qsa = kzalloc(sizeof(*qsa), GFP_NOFS); + if (!qsa) + return -ENOMEM; + + if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { + qsa->flags = 1; + qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; + } + + if (copy_to_user(arg, qsa, sizeof(*qsa))) + ret = -EFAULT; + + kfree(qsa); + return ret; +} + +static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) +{ + struct btrfs_root *root = BTRFS_I(file_inode(file))->root; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + return btrfs_qgroup_wait_for_completion(root->fs_info); +} + +static long _btrfs_ioctl_set_received_subvol(struct file *file, + struct btrfs_ioctl_received_subvol_args *sa) +{ + struct inode *inode = file_inode(file); + struct btrfs_root *root = BTRFS_I(inode)->root; + struct btrfs_root_item *root_item = &root->root_item; + struct btrfs_trans_handle *trans; + struct timespec ct = CURRENT_TIME; + int ret = 0; + int received_uuid_changed; + + if (!inode_owner_or_capable(inode)) + return -EPERM; + + ret = mnt_want_write_file(file); + if (ret < 0) + return ret; + + down_write(&root->fs_info->subvol_sem); + + if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { + ret = -EINVAL; + goto out; + } + + if (btrfs_root_readonly(root)) { + ret = -EROFS; + goto out; + } + + /* + * 1 - root item + * 2 - uuid items (received uuid + subvol uuid) + */ + trans = btrfs_start_transaction(root, 3); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + trans = NULL; + goto out; + } + + sa->rtransid = trans->transid; + sa->rtime.sec = ct.tv_sec; + sa->rtime.nsec = ct.tv_nsec; + + received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, + BTRFS_UUID_SIZE); + if (received_uuid_changed && + !btrfs_is_empty_uuid(root_item->received_uuid)) + btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, + root_item->received_uuid, + BTRFS_UUID_KEY_RECEIVED_SUBVOL, + root->root_key.objectid); + memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); + btrfs_set_root_stransid(root_item, sa->stransid); + btrfs_set_root_rtransid(root_item, sa->rtransid); + btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); + btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); + btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); + btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); + + ret = btrfs_update_root(trans, root->fs_info->tree_root, + &root->root_key, &root->root_item); + if (ret < 0) { + btrfs_end_transaction(trans, root); + goto out; + } + if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { + ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, + sa->uuid, + BTRFS_UUID_KEY_RECEIVED_SUBVOL, + root->root_key.objectid); + if (ret < 0 && ret != -EEXIST) { + btrfs_abort_transaction(trans, root, ret); + goto out; + } + } + ret = btrfs_commit_transaction(trans, root); + if (ret < 0) { + btrfs_abort_transaction(trans, root, ret); + goto out; + } + +out: + up_write(&root->fs_info->subvol_sem); + mnt_drop_write_file(file); + return ret; +} + +#ifdef CONFIG_64BIT +static long btrfs_ioctl_set_received_subvol_32(struct file *file, + void __user *arg) +{ + struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; + struct btrfs_ioctl_received_subvol_args *args64 = NULL; + int ret = 0; + + args32 = memdup_user(arg, sizeof(*args32)); + if (IS_ERR(args32)) { + ret = PTR_ERR(args32); + args32 = NULL; + goto out; + } + + args64 = kmalloc(sizeof(*args64), GFP_NOFS); + if (!args64) { + ret = -ENOMEM; + goto out; + } + + memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); + args64->stransid = args32->stransid; + args64->rtransid = args32->rtransid; + args64->stime.sec = args32->stime.sec; + args64->stime.nsec = args32->stime.nsec; + args64->rtime.sec = args32->rtime.sec; + args64->rtime.nsec = args32->rtime.nsec; + args64->flags = args32->flags; + + ret = _btrfs_ioctl_set_received_subvol(file, args64); + if (ret) + goto out; + + memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); + args32->stransid = args64->stransid; + args32->rtransid = args64->rtransid; + args32->stime.sec = args64->stime.sec; + args32->stime.nsec = args64->stime.nsec; + args32->rtime.sec = args64->rtime.sec; + args32->rtime.nsec = args64->rtime.nsec; + args32->flags = args64->flags; + + ret = copy_to_user(arg, args32, sizeof(*args32)); + if (ret) + ret = -EFAULT; + +out: + kfree(args32); + kfree(args64); + return ret; +} +#endif + +static long btrfs_ioctl_set_received_subvol(struct file *file, + void __user *arg) +{ + struct btrfs_ioctl_received_subvol_args *sa = NULL; + int ret = 0; + + sa = memdup_user(arg, sizeof(*sa)); + if (IS_ERR(sa)) { + ret = PTR_ERR(sa); + sa = NULL; + goto out; + } + + ret = _btrfs_ioctl_set_received_subvol(file, sa); + + if (ret) + goto out; + + ret = copy_to_user(arg, sa, sizeof(*sa)); + if (ret) + ret = -EFAULT; + +out: + kfree(sa); + return ret; +} + +static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) +{ + struct btrfs_root *root = BTRFS_I(file_inode(file))->root; + size_t len; + int ret; + char label[BTRFS_LABEL_SIZE]; + + spin_lock(&root->fs_info->super_lock); + memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); + spin_unlock(&root->fs_info->super_lock); + + len = strnlen(label, BTRFS_LABEL_SIZE); + + if (len == BTRFS_LABEL_SIZE) { + btrfs_warn(root->fs_info, + "label is too long, return the first %zu bytes", --len); + } + + ret = copy_to_user(arg, label, len); + + return ret ? -EFAULT : 0; +} + +static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) +{ + struct btrfs_root *root = BTRFS_I(file_inode(file))->root; + struct btrfs_super_block *super_block = root->fs_info->super_copy; + struct btrfs_trans_handle *trans; + char label[BTRFS_LABEL_SIZE]; + int ret; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (copy_from_user(label, arg, sizeof(label))) + return -EFAULT; + + if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { + btrfs_err(root->fs_info, "unable to set label with more than %d bytes", + BTRFS_LABEL_SIZE - 1); + return -EINVAL; + } + + ret = mnt_want_write_file(file); + if (ret) + return ret; + + trans = btrfs_start_transaction(root, 0); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + goto out_unlock; + } + + spin_lock(&root->fs_info->super_lock); + strcpy(super_block->label, label); + spin_unlock(&root->fs_info->super_lock); + ret = btrfs_commit_transaction(trans, root); + +out_unlock: + mnt_drop_write_file(file); + return ret; +} + +#define INIT_FEATURE_FLAGS(suffix) \ + { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ + .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ + .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } + +static int btrfs_ioctl_get_supported_features(struct file *file, + void __user *arg) +{ + static struct btrfs_ioctl_feature_flags features[3] = { + INIT_FEATURE_FLAGS(SUPP), + INIT_FEATURE_FLAGS(SAFE_SET), + INIT_FEATURE_FLAGS(SAFE_CLEAR) + }; + + if (copy_to_user(arg, &features, sizeof(features))) + return -EFAULT; + + return 0; +} + +static int btrfs_ioctl_get_features(struct file *file, void __user *arg) +{ + struct btrfs_root *root = BTRFS_I(file_inode(file))->root; + struct btrfs_super_block *super_block = root->fs_info->super_copy; + struct btrfs_ioctl_feature_flags features; + + features.compat_flags = btrfs_super_compat_flags(super_block); + features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); + features.incompat_flags = btrfs_super_incompat_flags(super_block); + + if (copy_to_user(arg, &features, sizeof(features))) + return -EFAULT; + + return 0; +} + +static int check_feature_bits(struct btrfs_root *root, + enum btrfs_feature_set set, + u64 change_mask, u64 flags, u64 supported_flags, + u64 safe_set, u64 safe_clear) +{ + const char *type = btrfs_feature_set_names[set]; + char *names; + u64 disallowed, unsupported; + u64 set_mask = flags & change_mask; + u64 clear_mask = ~flags & change_mask; + + unsupported = set_mask & ~supported_flags; + if (unsupported) { + names = btrfs_printable_features(set, unsupported); + if (names) { + btrfs_warn(root->fs_info, + "this kernel does not support the %s feature bit%s", + names, strchr(names, ',') ? "s" : ""); + kfree(names); + } else + btrfs_warn(root->fs_info, + "this kernel does not support %s bits 0x%llx", + type, unsupported); + return -EOPNOTSUPP; + } + + disallowed = set_mask & ~safe_set; + if (disallowed) { + names = btrfs_printable_features(set, disallowed); + if (names) { + btrfs_warn(root->fs_info, + "can't set the %s feature bit%s while mounted", + names, strchr(names, ',') ? "s" : ""); + kfree(names); + } else + btrfs_warn(root->fs_info, + "can't set %s bits 0x%llx while mounted", + type, disallowed); + return -EPERM; + } + + disallowed = clear_mask & ~safe_clear; + if (disallowed) { + names = btrfs_printable_features(set, disallowed); + if (names) { + btrfs_warn(root->fs_info, + "can't clear the %s feature bit%s while mounted", + names, strchr(names, ',') ? "s" : ""); + kfree(names); + } else + btrfs_warn(root->fs_info, + "can't clear %s bits 0x%llx while mounted", + type, disallowed); + return -EPERM; + } + + return 0; +} + +#define check_feature(root, change_mask, flags, mask_base) \ +check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \ + BTRFS_FEATURE_ ## mask_base ## _SUPP, \ + BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ + BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) + +static int btrfs_ioctl_set_features(struct file *file, void __user *arg) +{ + struct btrfs_root *root = BTRFS_I(file_inode(file))->root; + struct btrfs_super_block *super_block = root->fs_info->super_copy; + struct btrfs_ioctl_feature_flags flags[2]; + struct btrfs_trans_handle *trans; + u64 newflags; + int ret; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (copy_from_user(flags, arg, sizeof(flags))) + return -EFAULT; + + /* Nothing to do */ + if (!flags[0].compat_flags && !flags[0].compat_ro_flags && + !flags[0].incompat_flags) + return 0; + + ret = check_feature(root, flags[0].compat_flags, + flags[1].compat_flags, COMPAT); + if (ret) + return ret; + + ret = check_feature(root, flags[0].compat_ro_flags, + flags[1].compat_ro_flags, COMPAT_RO); + if (ret) + return ret; + + ret = check_feature(root, flags[0].incompat_flags, + flags[1].incompat_flags, INCOMPAT); + if (ret) + return ret; + + trans = btrfs_start_transaction(root, 0); + if (IS_ERR(trans)) + return PTR_ERR(trans); + + spin_lock(&root->fs_info->super_lock); + newflags = btrfs_super_compat_flags(super_block); + newflags |= flags[0].compat_flags & flags[1].compat_flags; + newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); + btrfs_set_super_compat_flags(super_block, newflags); + + newflags = btrfs_super_compat_ro_flags(super_block); + newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; + newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); + btrfs_set_super_compat_ro_flags(super_block, newflags); + + newflags = btrfs_super_incompat_flags(super_block); + newflags |= flags[0].incompat_flags & flags[1].incompat_flags; + newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); + btrfs_set_super_incompat_flags(super_block, newflags); + spin_unlock(&root->fs_info->super_lock); + + return btrfs_commit_transaction(trans, root); +} + long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { - struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; + struct btrfs_root *root = BTRFS_I(file_inode(file))->root; void __user *argp = (void __user *)arg; switch (cmd) { @@ -2233,14 +5248,22 @@ long btrfs_ioctl(struct file *file, unsigned int return btrfs_ioctl_setflags(file, argp); case FS_IOC_GETVERSION: return btrfs_ioctl_getversion(file, argp); + case FITRIM: + return btrfs_ioctl_fitrim(file, argp); case BTRFS_IOC_SNAP_CREATE: - return btrfs_ioctl_snap_create(file, argp, 0, 0); - case BTRFS_IOC_SNAP_CREATE_ASYNC: - return btrfs_ioctl_snap_create(file, argp, 0, 1); + return btrfs_ioctl_snap_create(file, argp, 0); + case BTRFS_IOC_SNAP_CREATE_V2: + return btrfs_ioctl_snap_create_v2(file, argp, 0); case BTRFS_IOC_SUBVOL_CREATE: - return btrfs_ioctl_snap_create(file, argp, 1, 0); + return btrfs_ioctl_snap_create(file, argp, 1); + case BTRFS_IOC_SUBVOL_CREATE_V2: + return btrfs_ioctl_snap_create_v2(file, argp, 1); case BTRFS_IOC_SNAP_DESTROY: return btrfs_ioctl_snap_destroy(file, argp); + case BTRFS_IOC_SUBVOL_GETFLAGS: + return btrfs_ioctl_subvol_getflags(file, argp); + case BTRFS_IOC_SUBVOL_SETFLAGS: + return btrfs_ioctl_subvol_setflags(file, argp); case BTRFS_IOC_DEFAULT_SUBVOL: return btrfs_ioctl_default_subvol(file, argp); case BTRFS_IOC_DEFRAG: @@ -2248,13 +5271,17 @@ long btrfs_ioctl(struct file *file, unsigned int case BTRFS_IOC_DEFRAG_RANGE: return btrfs_ioctl_defrag(file, argp); case BTRFS_IOC_RESIZE: - return btrfs_ioctl_resize(root, argp); + return btrfs_ioctl_resize(file, argp); case BTRFS_IOC_ADD_DEV: return btrfs_ioctl_add_dev(root, argp); case BTRFS_IOC_RM_DEV: - return btrfs_ioctl_rm_dev(root, argp); + return btrfs_ioctl_rm_dev(file, argp); + case BTRFS_IOC_FS_INFO: + return btrfs_ioctl_fs_info(root, argp); + case BTRFS_IOC_DEV_INFO: + return btrfs_ioctl_dev_info(root, argp); case BTRFS_IOC_BALANCE: - return btrfs_balance(root->fs_info->dev_root); + return btrfs_ioctl_balance(file, NULL); case BTRFS_IOC_CLONE: return btrfs_ioctl_clone(file, arg, 0, 0, 0); case BTRFS_IOC_CLONE_RANGE: @@ -2265,17 +5292,79 @@ long btrfs_ioctl(struct file *file, unsigned int return btrfs_ioctl_trans_end(file); case BTRFS_IOC_TREE_SEARCH: return btrfs_ioctl_tree_search(file, argp); + case BTRFS_IOC_TREE_SEARCH_V2: + return btrfs_ioctl_tree_search_v2(file, argp); case BTRFS_IOC_INO_LOOKUP: return btrfs_ioctl_ino_lookup(file, argp); + case BTRFS_IOC_INO_PATHS: + return btrfs_ioctl_ino_to_path(root, argp); + case BTRFS_IOC_LOGICAL_INO: + return btrfs_ioctl_logical_to_ino(root, argp); case BTRFS_IOC_SPACE_INFO: return btrfs_ioctl_space_info(root, argp); - case BTRFS_IOC_SYNC: - btrfs_sync_fs(file->f_dentry->d_sb, 1); - return 0; + case BTRFS_IOC_SYNC: { + int ret; + + ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); + if (ret) + return ret; + ret = btrfs_sync_fs(file->f_dentry->d_sb, 1); + return ret; + } case BTRFS_IOC_START_SYNC: - return btrfs_ioctl_start_sync(file, argp); + return btrfs_ioctl_start_sync(root, argp); case BTRFS_IOC_WAIT_SYNC: - return btrfs_ioctl_wait_sync(file, argp); + return btrfs_ioctl_wait_sync(root, argp); + case BTRFS_IOC_SCRUB: + return btrfs_ioctl_scrub(file, argp); + case BTRFS_IOC_SCRUB_CANCEL: + return btrfs_ioctl_scrub_cancel(root, argp); + case BTRFS_IOC_SCRUB_PROGRESS: + return btrfs_ioctl_scrub_progress(root, argp); + case BTRFS_IOC_BALANCE_V2: + return btrfs_ioctl_balance(file, argp); + case BTRFS_IOC_BALANCE_CTL: + return btrfs_ioctl_balance_ctl(root, arg); + case BTRFS_IOC_BALANCE_PROGRESS: + return btrfs_ioctl_balance_progress(root, argp); + case BTRFS_IOC_SET_RECEIVED_SUBVOL: + return btrfs_ioctl_set_received_subvol(file, argp); +#ifdef CONFIG_64BIT + case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: + return btrfs_ioctl_set_received_subvol_32(file, argp); +#endif + case BTRFS_IOC_SEND: + return btrfs_ioctl_send(file, argp); + case BTRFS_IOC_GET_DEV_STATS: + return btrfs_ioctl_get_dev_stats(root, argp); + case BTRFS_IOC_QUOTA_CTL: + return btrfs_ioctl_quota_ctl(file, argp); + case BTRFS_IOC_QGROUP_ASSIGN: + return btrfs_ioctl_qgroup_assign(file, argp); + case BTRFS_IOC_QGROUP_CREATE: + return btrfs_ioctl_qgroup_create(file, argp); + case BTRFS_IOC_QGROUP_LIMIT: + return btrfs_ioctl_qgroup_limit(file, argp); + case BTRFS_IOC_QUOTA_RESCAN: + return btrfs_ioctl_quota_rescan(file, argp); + case BTRFS_IOC_QUOTA_RESCAN_STATUS: + return btrfs_ioctl_quota_rescan_status(file, argp); + case BTRFS_IOC_QUOTA_RESCAN_WAIT: + return btrfs_ioctl_quota_rescan_wait(file, argp); + case BTRFS_IOC_DEV_REPLACE: + return btrfs_ioctl_dev_replace(root, argp); + case BTRFS_IOC_GET_FSLABEL: + return btrfs_ioctl_get_fslabel(file, argp); + case BTRFS_IOC_SET_FSLABEL: + return btrfs_ioctl_set_fslabel(file, argp); + case BTRFS_IOC_FILE_EXTENT_SAME: + return btrfs_ioctl_file_extent_same(file, argp); + case BTRFS_IOC_GET_SUPPORTED_FEATURES: + return btrfs_ioctl_get_supported_features(file, argp); + case BTRFS_IOC_GET_FEATURES: + return btrfs_ioctl_get_features(file, argp); + case BTRFS_IOC_SET_FEATURES: + return btrfs_ioctl_set_features(file, argp); } return -ENOTTY; |