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-rw-r--r--fs/btrfs/ctree.h4
-rw-r--r--fs/btrfs/extent-tree.c25
-rw-r--r--fs/btrfs/inode.c212
3 files changed, 50 insertions, 191 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index fd62aa856d1..a07b8c0a260 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1495,7 +1495,6 @@ struct btrfs_fs_info {
int do_barriers;
int closing;
int log_root_recovering;
- int enospc_unlink;
u64 total_pinned;
@@ -3183,6 +3182,9 @@ int btrfs_block_rsv_refill(struct btrfs_root *root,
int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
struct btrfs_block_rsv *dst_rsv,
u64 num_bytes);
+int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
+ struct btrfs_block_rsv *dest, u64 num_bytes,
+ int min_factor);
void btrfs_block_rsv_release(struct btrfs_root *root,
struct btrfs_block_rsv *block_rsv,
u64 num_bytes);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 4ec8305fe07..e14f8bd4b31 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4297,6 +4297,31 @@ static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv,
spin_unlock(&block_rsv->lock);
}
+int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
+ struct btrfs_block_rsv *dest, u64 num_bytes,
+ int min_factor)
+{
+ struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
+ u64 min_bytes;
+
+ if (global_rsv->space_info != dest->space_info)
+ return -ENOSPC;
+
+ spin_lock(&global_rsv->lock);
+ min_bytes = div_factor(global_rsv->size, min_factor);
+ if (global_rsv->reserved < min_bytes + num_bytes) {
+ spin_unlock(&global_rsv->lock);
+ return -ENOSPC;
+ }
+ global_rsv->reserved -= num_bytes;
+ if (global_rsv->reserved < global_rsv->size)
+ global_rsv->full = 0;
+ spin_unlock(&global_rsv->lock);
+
+ block_rsv_add_bytes(dest, num_bytes, 1);
+ return 0;
+}
+
static void block_rsv_release_bytes(struct btrfs_fs_info *fs_info,
struct btrfs_block_rsv *block_rsv,
struct btrfs_block_rsv *dest, u64 num_bytes)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 51520755f4d..c0e95b1554a 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3679,53 +3679,20 @@ int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
}
return ret;
}
-
-
-/* helper to check if there is any shared block in the path */
-static int check_path_shared(struct btrfs_root *root,
- struct btrfs_path *path)
-{
- struct extent_buffer *eb;
- int level;
- u64 refs = 1;
-
- for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
- int ret;
-
- if (!path->nodes[level])
- break;
- eb = path->nodes[level];
- if (!btrfs_block_can_be_shared(root, eb))
- continue;
- ret = btrfs_lookup_extent_info(NULL, root, eb->start, level, 1,
- &refs, NULL);
- if (refs > 1)
- return 1;
- }
- return 0;
-}
/*
* helper to start transaction for unlink and rmdir.
*
- * unlink and rmdir are special in btrfs, they do not always free space.
- * so in enospc case, we should make sure they will free space before
- * allowing them to use the global metadata reservation.
+ * unlink and rmdir are special in btrfs, they do not always free space, so
+ * if we cannot make our reservations the normal way try and see if there is
+ * plenty of slack room in the global reserve to migrate, otherwise we cannot
+ * allow the unlink to occur.
*/
-static struct btrfs_trans_handle *__unlink_start_trans(struct inode *dir,
- struct dentry *dentry)
+static struct btrfs_trans_handle *__unlink_start_trans(struct inode *dir)
{
struct btrfs_trans_handle *trans;
struct btrfs_root *root = BTRFS_I(dir)->root;
- struct btrfs_path *path;
- struct btrfs_dir_item *di;
- struct inode *inode = dentry->d_inode;
- u64 index;
- int check_link = 1;
- int err = -ENOSPC;
int ret;
- u64 ino = btrfs_ino(inode);
- u64 dir_ino = btrfs_ino(dir);
/*
* 1 for the possible orphan item
@@ -3738,158 +3705,23 @@ static struct btrfs_trans_handle *__unlink_start_trans(struct inode *dir,
if (!IS_ERR(trans) || PTR_ERR(trans) != -ENOSPC)
return trans;
- if (ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)
- return ERR_PTR(-ENOSPC);
-
- /* check if there is someone else holds reference */
- if (S_ISDIR(inode->i_mode) && atomic_read(&inode->i_count) > 1)
- return ERR_PTR(-ENOSPC);
-
- if (atomic_read(&inode->i_count) > 2)
- return ERR_PTR(-ENOSPC);
-
- if (xchg(&root->fs_info->enospc_unlink, 1))
- return ERR_PTR(-ENOSPC);
-
- path = btrfs_alloc_path();
- if (!path) {
- root->fs_info->enospc_unlink = 0;
- return ERR_PTR(-ENOMEM);
- }
+ if (PTR_ERR(trans) == -ENOSPC) {
+ u64 num_bytes = btrfs_calc_trans_metadata_size(root, 5);
- /* 1 for the orphan item */
- trans = btrfs_start_transaction(root, 1);
- if (IS_ERR(trans)) {
- btrfs_free_path(path);
- root->fs_info->enospc_unlink = 0;
- return trans;
- }
-
- path->skip_locking = 1;
- path->search_commit_root = 1;
-
- ret = btrfs_lookup_inode(trans, root, path,
- &BTRFS_I(dir)->location, 0);
- if (ret < 0) {
- err = ret;
- goto out;
- }
- if (ret == 0) {
- if (check_path_shared(root, path))
- goto out;
- } else {
- check_link = 0;
- }
- btrfs_release_path(path);
-
- ret = btrfs_lookup_inode(trans, root, path,
- &BTRFS_I(inode)->location, 0);
- if (ret < 0) {
- err = ret;
- goto out;
- }
- if (ret == 0) {
- if (check_path_shared(root, path))
- goto out;
- } else {
- check_link = 0;
- }
- btrfs_release_path(path);
-
- if (ret == 0 && S_ISREG(inode->i_mode)) {
- ret = btrfs_lookup_file_extent(trans, root, path,
- ino, (u64)-1, 0);
- if (ret < 0) {
- err = ret;
- goto out;
+ trans = btrfs_start_transaction(root, 0);
+ if (IS_ERR(trans))
+ return trans;
+ ret = btrfs_cond_migrate_bytes(root->fs_info,
+ &root->fs_info->trans_block_rsv,
+ num_bytes, 5);
+ if (ret) {
+ btrfs_end_transaction(trans, root);
+ return ERR_PTR(ret);
}
- BUG_ON(ret == 0); /* Corruption */
- if (check_path_shared(root, path))
- goto out;
- btrfs_release_path(path);
- }
-
- if (!check_link) {
- err = 0;
- goto out;
- }
-
- di = btrfs_lookup_dir_item(trans, root, path, dir_ino,
- dentry->d_name.name, dentry->d_name.len, 0);
- if (IS_ERR(di)) {
- err = PTR_ERR(di);
- goto out;
- }
- if (di) {
- if (check_path_shared(root, path))
- goto out;
- } else {
- err = 0;
- goto out;
- }
- btrfs_release_path(path);
-
- ret = btrfs_get_inode_ref_index(trans, root, path, dentry->d_name.name,
- dentry->d_name.len, ino, dir_ino, 0,
- &index);
- if (ret) {
- err = ret;
- goto out;
- }
-
- if (check_path_shared(root, path))
- goto out;
-
- btrfs_release_path(path);
-
- /*
- * This is a commit root search, if we can lookup inode item and other
- * relative items in the commit root, it means the transaction of
- * dir/file creation has been committed, and the dir index item that we
- * delay to insert has also been inserted into the commit root. So
- * we needn't worry about the delayed insertion of the dir index item
- * here.
- */
- di = btrfs_lookup_dir_index_item(trans, root, path, dir_ino, index,
- dentry->d_name.name, dentry->d_name.len, 0);
- if (IS_ERR(di)) {
- err = PTR_ERR(di);
- goto out;
- }
- BUG_ON(ret == -ENOENT);
- if (check_path_shared(root, path))
- goto out;
-
- err = 0;
-out:
- btrfs_free_path(path);
- /* Migrate the orphan reservation over */
- if (!err)
- err = btrfs_block_rsv_migrate(trans->block_rsv,
- &root->fs_info->global_block_rsv,
- trans->bytes_reserved);
-
- if (err) {
- btrfs_end_transaction(trans, root);
- root->fs_info->enospc_unlink = 0;
- return ERR_PTR(err);
- }
-
- trans->block_rsv = &root->fs_info->global_block_rsv;
- return trans;
-}
-
-static void __unlink_end_trans(struct btrfs_trans_handle *trans,
- struct btrfs_root *root)
-{
- if (trans->block_rsv->type == BTRFS_BLOCK_RSV_GLOBAL) {
- btrfs_block_rsv_release(root, trans->block_rsv,
- trans->bytes_reserved);
trans->block_rsv = &root->fs_info->trans_block_rsv;
- BUG_ON(!root->fs_info->enospc_unlink);
- root->fs_info->enospc_unlink = 0;
+ trans->bytes_reserved = num_bytes;
}
- btrfs_end_transaction(trans, root);
+ return trans;
}
static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
@@ -3899,7 +3731,7 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
struct inode *inode = dentry->d_inode;
int ret;
- trans = __unlink_start_trans(dir, dentry);
+ trans = __unlink_start_trans(dir);
if (IS_ERR(trans))
return PTR_ERR(trans);
@@ -3917,7 +3749,7 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
}
out:
- __unlink_end_trans(trans, root);
+ btrfs_end_transaction(trans, root);
btrfs_btree_balance_dirty(root);
return ret;
}
@@ -4014,7 +3846,7 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
if (btrfs_ino(inode) == BTRFS_FIRST_FREE_OBJECTID)
return -EPERM;
- trans = __unlink_start_trans(dir, dentry);
+ trans = __unlink_start_trans(dir);
if (IS_ERR(trans))
return PTR_ERR(trans);
@@ -4036,7 +3868,7 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
if (!err)
btrfs_i_size_write(inode, 0);
out:
- __unlink_end_trans(trans, root);
+ btrfs_end_transaction(trans, root);
btrfs_btree_balance_dirty(root);
return err;
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-30 13:15:43 +0000