/* -*- mode: c; c-basic-offset: 8; -*- * vim: noexpandtab sw=8 ts=8 sts=0: * * inode.c * * vfs' aops, fops, dops and iops * * Copyright (C) 2002, 2004 Oracle. All rights reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public * License along with this program; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 021110-1307, USA. */ #include <linux/fs.h> #include <linux/types.h> #include <linux/slab.h> #include <linux/highmem.h> #include <linux/pagemap.h> #include <asm/byteorder.h> #define MLOG_MASK_PREFIX ML_INODE #include <cluster/masklog.h> #include "ocfs2.h" #include "alloc.h" #include "dlmglue.h" #include "extent_map.h" #include "file.h" #include "heartbeat.h" #include "inode.h" #include "journal.h" #include "namei.h" #include "suballoc.h" #include "super.h" #include "symlink.h" #include "sysfile.h" #include "uptodate.h" #include "vote.h" #include "buffer_head_io.h" struct ocfs2_find_inode_args { u64 fi_blkno; unsigned long fi_ino; unsigned int fi_flags; }; static int ocfs2_read_locked_inode(struct inode *inode, struct ocfs2_find_inode_args *args); static int ocfs2_init_locked_inode(struct inode *inode, void *opaque); static int ocfs2_find_actor(struct inode *inode, void *opaque); static int ocfs2_truncate_for_delete(struct ocfs2_super *osb, struct inode *inode, struct buffer_head *fe_bh); void ocfs2_set_inode_flags(struct inode *inode) { unsigned int flags = OCFS2_I(inode)->ip_attr; inode->i_flags &= ~(S_IMMUTABLE | S_SYNC | S_APPEND | S_NOATIME | S_DIRSYNC); if (flags & OCFS2_IMMUTABLE_FL) inode->i_flags |= S_IMMUTABLE; if (flags & OCFS2_SYNC_FL) inode->i_flags |= S_SYNC; if (flags & OCFS2_APPEND_FL) inode->i_flags |= S_APPEND; if (flags & OCFS2_NOATIME_FL) inode->i_flags |= S_NOATIME; if (flags & OCFS2_DIRSYNC_FL) inode->i_flags |= S_DIRSYNC; } /* Propagate flags from i_flags to OCFS2_I(inode)->ip_attr */ void ocfs2_get_inode_flags(struct ocfs2_inode_info *oi) { unsigned int flags = oi->vfs_inode.i_flags; oi->ip_attr &= ~(OCFS2_SYNC_FL|OCFS2_APPEND_FL| OCFS2_IMMUTABLE_FL|OCFS2_NOATIME_FL|OCFS2_DIRSYNC_FL); if (flags & S_SYNC) oi->ip_attr |= OCFS2_SYNC_FL; if (flags & S_APPEND) oi->ip_attr |= OCFS2_APPEND_FL; if (flags & S_IMMUTABLE) oi->ip_attr |= OCFS2_IMMUTABLE_FL; if (flags & S_NOATIME) oi->ip_attr |= OCFS2_NOATIME_FL; if (flags & S_DIRSYNC) oi->ip_attr |= OCFS2_DIRSYNC_FL; } struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 blkno, int flags) { struct inode *inode = NULL; struct super_block *sb = osb->sb; struct ocfs2_find_inode_args args; mlog_entry("(blkno = %llu)\n", (unsigned long long)blkno); /* Ok. By now we've either got the offsets passed to us by the * caller, or we just pulled them off the bh. Lets do some * sanity checks to make sure they're OK. */ if (blkno == 0) { inode = ERR_PTR(-EINVAL); mlog_errno(PTR_ERR(inode)); goto bail; } args.fi_blkno = blkno; args.fi_flags = flags; args.fi_ino = ino_from_blkno(sb, blkno); inode = iget5_locked(sb, args.fi_ino, ocfs2_find_actor, ocfs2_init_locked_inode, &args); /* inode was *not* in the inode cache. 2.6.x requires * us to do our own read_inode call and unlock it * afterwards. */ if (inode && inode->i_state & I_NEW) { mlog(0, "Inode was not in inode cache, reading it.\n"); ocfs2_read_locked_inode(inode, &args); unlock_new_inode(inode); } if (inode == NULL) { inode = ERR_PTR(-ENOMEM); mlog_errno(PTR_ERR(inode)); goto bail; } if (is_bad_inode(inode)) { iput(inode); inode = ERR_PTR(-ESTALE); goto bail; } bail: if (!IS_ERR(inode)) { mlog(0, "returning inode with number %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); mlog_exit_ptr(inode); } return inode; } /* * here's how inodes get read from disk: * iget5_locked -> find_actor -> OCFS2_FIND_ACTOR * found? : return the in-memory inode * not found? : get_new_inode -> OCFS2_INIT_LOCKED_INODE */ static int ocfs2_find_actor(struct inode *inode, void *opaque) { struct ocfs2_find_inode_args *args = NULL; struct ocfs2_inode_info *oi = OCFS2_I(inode); int ret = 0; mlog_entry("(0x%p, %lu, 0x%p)\n", inode, inode->i_ino, opaque); args = opaque; mlog_bug_on_msg(!inode, "No inode in find actor!\n"); if (oi->ip_blkno != args->fi_blkno) goto bail; ret = 1; bail: mlog_exit(ret); return ret; } /* * initialize the new inode, but don't do anything that would cause * us to sleep. * return 0 on success, 1 on failure */ static int ocfs2_init_locked_inode(struct inode *inode, void *opaque) { struct ocfs2_find_inode_args *args = opaque; mlog_entry("inode = %p, opaque = %p\n", inode, opaque); inode->i_ino = args->fi_ino; OCFS2_I(inode)->ip_blkno = args->fi_blkno; mlog_exit(0); return 0; } int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe, int create_ino) { struct super_block *sb; struct ocfs2_super *osb; int status = -EINVAL; mlog_entry("(0x%p, size:%llu)\n", inode, (unsigned long long)le64_to_cpu(fe->i_size)); sb = inode->i_sb; osb = OCFS2_SB(sb); /* this means that read_inode cannot create a superblock inode * today. change if needed. */ if (!OCFS2_IS_VALID_DINODE(fe) || !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL))) { mlog(0, "Invalid dinode: i_ino=%lu, i_blkno=%llu, " "signature = %.*s, flags = 0x%x\n", inode->i_ino, (unsigned long long)le64_to_cpu(fe->i_blkno), 7, fe->i_signature, le32_to_cpu(fe->i_flags)); goto bail; } if (le32_to_cpu(fe->i_fs_generation) != osb->fs_generation) { mlog(ML_ERROR, "file entry generation does not match " "superblock! osb->fs_generation=%x, " "fe->i_fs_generation=%x\n", osb->fs_generation, le32_to_cpu(fe->i_fs_generation)); goto bail; } OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters); OCFS2_I(inode)->ip_attr = le32_to_cpu(fe->i_attr); OCFS2_I(inode)->ip_dyn_features = le16_to_cpu(fe->i_dyn_features); inode->i_version = 1; inode->i_generation = le32_to_cpu(fe->i_generation); inode->i_rdev = huge_decode_dev(le64_to_cpu(fe->id1.dev1.i_rdev)); inode->i_mode = le16_to_cpu(fe->i_mode); inode->i_uid = le32_to_cpu(fe->i_uid); inode->i_gid = le32_to_cpu(fe->i_gid); /* Fast symlinks will have i_size but no allocated clusters. */ if (S_ISLNK(inode->i_mode) && !fe->i_clusters) inode->i_blocks = 0; else inode->i_blocks = ocfs2_inode_sector_count(inode); inode->i_mapping->a_ops = &ocfs2_aops; inode->i_atime.tv_sec = le64_to_cpu(fe->i_atime); inode->i_atime.tv_nsec = le32_to_cpu(fe->i_atime_nsec); inode->i_mtime.tv_sec = le64_to_cpu(fe->i_mtime); inode->i_mtime.tv_nsec = le32_to_cpu(fe->i_mtime_nsec); inode->i_ctime.tv_sec = le64_to_cpu(fe->i_ctime); inode->i_ctime.tv_nsec = le32_to_cpu(fe->i_ctime_nsec); if (OCFS2_I(inode)->ip_blkno != le64_to_cpu(fe->i_blkno)) mlog(ML_ERROR, "ip_blkno %llu != i_blkno %llu!\n", (unsigned long long)OCFS2_I(inode)->ip_blkno, (unsigned long long)le64_to_cpu(fe->i_blkno)); inode->i_nlink = le16_to_cpu(fe->i_links_count); if (fe->i_flags & cpu_to_le32(OCFS2_SYSTEM_FL)) OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SYSTEM_FILE; if (fe->i_flags & cpu_to_le32(OCFS2_LOCAL_ALLOC_FL)) { OCFS2_I(inode)->ip_flags |= OCFS2_INODE_BITMAP; mlog(0, "local alloc inode: i_ino=%lu\n", inode->i_ino); } else if (fe->i_flags & cpu_to_le32(OCFS2_BITMAP_FL)) { OCFS2_I(inode)->ip_flags |= OCFS2_INODE_BITMAP; } else if (fe->i_flags & cpu_to_le32(OCFS2_SUPER_BLOCK_FL)) { mlog(0, "superblock inode: i_ino=%lu\n", inode->i_ino); /* we can't actually hit this as read_inode can't * handle superblocks today ;-) */ BUG(); } switch (inode->i_mode & S_IFMT) { case S_IFREG: inode->i_fop = &ocfs2_fops; inode->i_op = &ocfs2_file_iops; i_size_write(inode, le64_to_cpu(fe->i_size)); break; case S_IFDIR: inode->i_op = &ocfs2_dir_iops; inode->i_fop = &ocfs2_dops; i_size_write(inode, le64_to_cpu(fe->i_size)); break; case S_IFLNK: if (ocfs2_inode_is_fast_symlink(inode)) inode->i_op = &ocfs2_fast_symlink_inode_operations; else inode->i_op = &ocfs2_symlink_inode_operations; i_size_write(inode, le64_to_cpu(fe->i_size)); break; default: inode->i_op = &ocfs2_special_file_iops; init_special_inode(inode, inode->i_mode, inode->i_rdev); break; } if (create_ino) { inode->i_ino = ino_from_blkno(inode->i_sb, le64_to_cpu(fe->i_blkno)); /* * If we ever want to create system files from kernel, * the generation argument to * ocfs2_inode_lock_res_init() will have to change. */ BUG_ON(le32_to_cpu(fe->i_flags) & OCFS2_SYSTEM_FL); ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_meta_lockres, OCFS2_LOCK_TYPE_META, 0, inode); ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_open_lockres, OCFS2_LOCK_TYPE_OPEN, 0, inode); } ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_rw_lockres, OCFS2_LOCK_TYPE_RW, inode->i_generation, inode); ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_data_lockres, OCFS2_LOCK_TYPE_DATA, inode->i_generation, inode); ocfs2_set_inode_flags(inode); status = 0; bail: mlog_exit(status); return status; } static int ocfs2_read_locked_inode(struct inode *inode, struct ocfs2_find_inode_args *args) { struct super_block *sb; struct ocfs2_super *osb; struct ocfs2_dinode *fe; struct buffer_head *bh = NULL; int status, can_lock; u32 generation = 0; mlog_entry("(0x%p, 0x%p)\n", inode, args); status = -EINVAL; if (inode == NULL || inode->i_sb == NULL) { mlog(ML_ERROR, "bad inode\n"); return status; } sb = inode->i_sb; osb = OCFS2_SB(sb); if (!args) { mlog(ML_ERROR, "bad inode args\n"); make_bad_inode(inode); return status; } /* * To improve performance of cold-cache inode stats, we take * the cluster lock here if possible. * * Generally, OCFS2 never trusts the contents of an inode * unless it's holding a cluster lock, so taking it here isn't * a correctness issue as much as it is a performance * improvement. * * There are three times when taking the lock is not a good idea: * * 1) During startup, before we have initialized the DLM. * * 2) If we are reading certain system files which never get * cluster locks (local alloc, truncate log). * * 3) If the process doing the iget() is responsible for * orphan dir recovery. We're holding the orphan dir lock and * can get into a deadlock with another process on another * node in ->delete_inode(). * * #1 and #2 can be simply solved by never taking the lock * here for system files (which are the only type we read * during mount). It's a heavier approach, but our main * concern is user-accesible files anyway. * * #3 works itself out because we'll eventually take the * cluster lock before trusting anything anyway. */ can_lock = !(args->fi_flags & OCFS2_FI_FLAG_SYSFILE) && !(args->fi_flags & OCFS2_FI_FLAG_ORPHAN_RECOVERY) && !ocfs2_mount_local(osb); /* * To maintain backwards compatibility with older versions of * ocfs2-tools, we still store the generation value for system * files. The only ones that actually matter to userspace are * the journals, but it's easier and inexpensive to just flag * all system files similarly. */ if (args->fi_flags & OCFS2_FI_FLAG_SYSFILE) generation = osb->fs_generation; ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_meta_lockres, OCFS2_LOCK_TYPE_META, generation, inode); ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_open_lockres, OCFS2_LOCK_TYPE_OPEN, 0, inode); if (can_lock) { status = ocfs2_open_lock(inode); if (status) { make_bad_inode(inode); mlog_errno(status); return status; } status = ocfs2_meta_lock(inode, NULL, 0); if (status) { make_bad_inode(inode); mlog_errno(status); return status; } } if (args->fi_flags & OCFS2_FI_FLAG_ORPHAN_RECOVERY) { status = ocfs2_try_open_lock(inode, 0); if (status) { make_bad_inode(inode); return status; } } status = ocfs2_read_block(osb, args->fi_blkno, &bh, 0, can_lock ? inode : NULL); if (status < 0) { mlog_errno(status); goto bail; } status = -EINVAL; fe = (struct ocfs2_dinode *) bh->b_data; if (!OCFS2_IS_VALID_DINODE(fe)) { mlog(ML_ERROR, "Invalid dinode #%llu: signature = %.*s\n", (unsigned long long)le64_to_cpu(fe->i_blkno), 7, fe->i_signature); goto bail; } /* * This is a code bug. Right now the caller needs to * understand whether it is asking for a system file inode or * not so the proper lock names can be built. */ mlog_bug_on_msg(!!(fe->i_flags & cpu_to_le32(OCFS2_SYSTEM_FL)) != !!(args->fi_flags & OCFS2_FI_FLAG_SYSFILE), "Inode %llu: system file state is ambigous\n", (unsigned long long)args->fi_blkno); if (S_ISCHR(le16_to_cpu(fe->i_mode)) || S_ISBLK(le16_to_cpu(fe->i_mode))) inode->i_rdev = huge_decode_dev(le64_to_cpu(fe->id1.dev1.i_rdev)); if (ocfs2_populate_inode(inode, fe, 0) < 0) goto bail; BUG_ON(args->fi_blkno != le64_to_cpu(fe->i_blkno)); status = 0; bail: if (can_lock) ocfs2_meta_unlock(inode, 0); if (status < 0) make_bad_inode(inode); if (args && bh) brelse(bh); mlog_exit(status); return status; } void ocfs2_sync_blockdev(struct super_block *sb) { sync_blockdev(sb->s_bdev); } static int ocfs2_truncate_for_delete(struct ocfs2_super *osb, struct inode *inode, struct buffer_head *fe_bh) { int status = 0; struct ocfs2_truncate_context *tc = NULL; struct ocfs2_dinode *fe; handle_t *handle = NULL; mlog_entry_void(); fe = (struct ocfs2_dinode *) fe_bh->b_data; /* * This check will also skip truncate of inodes with inline * data and fast symlinks. */ if (fe->i_clusters) { handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); if (IS_ERR(handle)) { status = PTR_ERR(handle); mlog_errno(status); goto out; } status = ocfs2_journal_access(handle, inode, fe_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (status < 0) { mlog_errno(status); goto out; } i_size_write(inode, 0); status = ocfs2_mark_inode_dirty(handle, inode, fe_bh); if (status < 0) { mlog_errno(status); goto out; } ocfs2_commit_trans(osb, handle); handle = NULL; status = ocfs2_prepare_truncate(osb, inode, fe_bh, &tc); if (status < 0) { mlog_errno(status); goto out; } status = ocfs2_commit_truncate(osb, inode, fe_bh, tc); if (status < 0) { mlog_errno(status); goto out; } } out: if (handle) ocfs2_commit_trans(osb, handle); mlog_exit(status); return status; } static int ocfs2_remove_inode(struct inode *inode, struct buffer_head *di_bh, struct inode *orphan_dir_inode, struct buffer_head *orphan_dir_bh) { int status; struct inode *inode_alloc_inode = NULL; struct buffer_head *inode_alloc_bh = NULL; handle_t *handle; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data; inode_alloc_inode = ocfs2_get_system_file_inode(osb, INODE_ALLOC_SYSTEM_INODE, le16_to_cpu(di->i_suballoc_slot)); if (!inode_alloc_inode) { status = -EEXIST; mlog_errno(status); goto bail; } mutex_lock(&inode_alloc_inode->i_mutex); status = ocfs2_meta_lock(inode_alloc_inode, &inode_alloc_bh, 1); if (status < 0) { mutex_unlock(&inode_alloc_inode->i_mutex); mlog_errno(status); goto bail; } handle = ocfs2_start_trans(osb, OCFS2_DELETE_INODE_CREDITS); if (IS_ERR(handle)) { status = PTR_ERR(handle); mlog_errno(status); goto bail_unlock; } status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode, orphan_dir_bh); if (status < 0) { mlog_errno(status); goto bail_commit; } /* set the inodes dtime */ status = ocfs2_journal_access(handle, inode, di_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (status < 0) { mlog_errno(status); goto bail_commit; } di->i_dtime = cpu_to_le64(CURRENT_TIME.tv_sec); le32_and_cpu(&di->i_flags, ~(OCFS2_VALID_FL | OCFS2_ORPHANED_FL)); status = ocfs2_journal_dirty(handle, di_bh); if (status < 0) { mlog_errno(status); goto bail_commit; } ocfs2_remove_from_cache(inode, di_bh); status = ocfs2_free_dinode(handle, inode_alloc_inode, inode_alloc_bh, di); if (status < 0) mlog_errno(status); bail_commit: ocfs2_commit_trans(osb, handle); bail_unlock: ocfs2_meta_unlock(inode_alloc_inode, 1); mutex_unlock(&inode_alloc_inode->i_mutex); brelse(inode_alloc_bh); bail: iput(inode_alloc_inode); return status; } /* * Serialize with orphan dir recovery. If the process doing * recovery on this orphan dir does an iget() with the dir * i_mutex held, we'll deadlock here. Instead we detect this * and exit early - recovery will wipe this inode for us. */ static int ocfs2_check_orphan_recovery_state(struct ocfs2_super *osb, int slot) { int ret = 0; spin_lock(&osb->osb_lock); if (ocfs2_node_map_test_bit(osb, &osb->osb_recovering_orphan_dirs, slot)) { mlog(0, "Recovery is happening on orphan dir %d, will skip " "this inode\n", slot); ret = -EDEADLK; goto out; } /* This signals to the orphan recovery process that it should * wait for us to handle the wipe. */ osb->osb_orphan_wipes[slot]++; out: spin_unlock(&osb->osb_lock); return ret; } static void ocfs2_signal_wipe_completion(struct ocfs2_super *osb, int slot) { spin_lock(&osb->osb_lock); osb->osb_orphan_wipes[slot]--; spin_unlock(&osb->osb_lock); wake_up(&osb->osb_wipe_event); } static int ocfs2_wipe_inode(struct inode *inode, struct buffer_head *di_bh) { int status, orphaned_slot; struct inode *orphan_dir_inode = NULL; struct buffer_head *orphan_dir_bh = NULL; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct ocfs2_dinode *di; di = (struct ocfs2_dinode *) di_bh->b_data; orphaned_slot = le16_to_cpu(di->i_orphaned_slot); status = ocfs2_check_orphan_recovery_state(osb, orphaned_slot); if (status) return status; orphan_dir_inode = ocfs2_get_system_file_inode(osb, ORPHAN_DIR_SYSTEM_INODE, orphaned_slot); if (!orphan_dir_inode) { status = -EEXIST; mlog_errno(status); goto bail; } /* Lock the orphan dir. The lock will be held for the entire * delete_inode operation. We do this now to avoid races with * recovery completion on other nodes. */ mutex_lock(&orphan_dir_inode->i_mutex); status = ocfs2_meta_lock(orphan_dir_inode, &orphan_dir_bh, 1); if (status < 0) { mutex_unlock(&orphan_dir_inode->i_mutex); mlog_errno(status); goto bail; } /* we do this while holding the orphan dir lock because we * don't want recovery being run from another node to vote for * an inode delete on us -- this will result in two nodes * truncating the same file! */ status = ocfs2_truncate_for_delete(osb, inode, di_bh); if (status < 0) { mlog_errno(status); goto bail_unlock_dir; } status = ocfs2_remove_inode(inode, di_bh, orphan_dir_inode, orphan_dir_bh); if (status < 0) mlog_errno(status); bail_unlock_dir: ocfs2_meta_unlock(orphan_dir_inode, 1); mutex_unlock(&orphan_dir_inode->i_mutex); brelse(orphan_dir_bh); bail: iput(orphan_dir_inode); ocfs2_signal_wipe_completion(osb, orphaned_slot); return status; } /* There is a series of simple checks that should be done before a * vote is even considered. Encapsulate those in this function. */ static int ocfs2_inode_is_valid_to_delete(struct inode *inode) { int ret = 0; struct ocfs2_inode_info *oi = OCFS2_I(inode); struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); /* We shouldn't be getting here for the root directory * inode.. */ if (inode == osb->root_inode) { mlog(ML_ERROR, "Skipping delete of root inode.\n"); goto bail; } /* If we're coming from process_vote we can't go into our own * voting [hello, deadlock city!], so unforuntately we just * have to skip deleting this guy. That's OK though because * the node who's doing the actual deleting should handle it * anyway. */ if (current == osb->vote_task) { mlog(0, "Skipping delete of %lu because we're currently " "in process_vote\n", inode->i_ino); goto bail; } spin_lock(&oi->ip_lock); /* OCFS2 *never* deletes system files. This should technically * never get here as system file inodes should always have a * positive link count. */ if (oi->ip_flags & OCFS2_INODE_SYSTEM_FILE) { mlog(ML_ERROR, "Skipping delete of system file %llu\n", (unsigned long long)oi->ip_blkno); goto bail_unlock; } /* If we have voted "yes" on the wipe of this inode for * another node, it will be marked here so we can safely skip * it. Recovery will cleanup any inodes we might inadvertantly * skip here. */ if (oi->ip_flags & OCFS2_INODE_SKIP_DELETE) { mlog(0, "Skipping delete of %lu because another node " "has done this for us.\n", inode->i_ino); goto bail_unlock; } ret = 1; bail_unlock: spin_unlock(&oi->ip_lock); bail: return ret; } /* Query the cluster to determine whether we should wipe an inode from * disk or not. * * Requires the inode to have the cluster lock. */ static int ocfs2_query_inode_wipe(struct inode *inode, struct buffer_head *di_bh, int *wipe) { int status = 0; struct ocfs2_inode_info *oi = OCFS2_I(inode); struct ocfs2_dinode *di; *wipe = 0; /* While we were waiting for the cluster lock in * ocfs2_delete_inode, another node might have asked to delete * the inode. Recheck our flags to catch this. */ if (!ocfs2_inode_is_valid_to_delete(inode)) { mlog(0, "Skipping delete of %llu because flags changed\n", (unsigned long long)oi->ip_blkno); goto bail; } /* Now that we have an up to date inode, we can double check * the link count. */ if (inode->i_nlink) { mlog(0, "Skipping delete of %llu because nlink = %u\n", (unsigned long long)oi->ip_blkno, inode->i_nlink); goto bail; } /* Do some basic inode verification... */ di = (struct ocfs2_dinode *) di_bh->b_data; if (!(di->i_flags & cpu_to_le32(OCFS2_ORPHANED_FL))) { /* for lack of a better error? */ status = -EEXIST; mlog(ML_ERROR, "Inode %llu (on-disk %llu) not orphaned! " "Disk flags 0x%x, inode flags 0x%x\n", (unsigned long long)oi->ip_blkno, (unsigned long long)le64_to_cpu(di->i_blkno), le32_to_cpu(di->i_flags), oi->ip_flags); goto bail; } /* has someone already deleted us?! baaad... */ if (di->i_dtime) { status = -EEXIST; mlog_errno(status); goto bail; } /* * This is how ocfs2 determines whether an inode is still live * within the cluster. Every node takes a shared read lock on * the inode open lock in ocfs2_read_locked_inode(). When we * get to ->delete_inode(), each node tries to convert it's * lock to an exclusive. Trylocks are serialized by the inode * meta data lock. If the upconvert suceeds, we know the inode * is no longer live and can be deleted. * * Though we call this with the meta data lock held, the * trylock keeps us from ABBA deadlock. */ status = ocfs2_try_open_lock(inode, 1); if (status == -EAGAIN) { status = 0; mlog(0, "Skipping delete of %llu because it is in use on" "other nodes\n", (unsigned long long)oi->ip_blkno); goto bail; } if (status < 0) { mlog_errno(status); goto bail; } *wipe = 1; mlog(0, "Inode %llu is ok to wipe from orphan dir %u\n", (unsigned long long)oi->ip_blkno, le16_to_cpu(di->i_orphaned_slot)); bail: return status; } /* Support function for ocfs2_delete_inode. Will help us keep the * inode data in a consistent state for clear_inode. Always truncates * pages, optionally sync's them first. */ static void ocfs2_cleanup_delete_inode(struct inode *inode, int sync_data) { mlog(0, "Cleanup inode %llu, sync = %d\n", (unsigned long long)OCFS2_I(inode)->ip_blkno, sync_data); if (sync_data) write_inode_now(inode, 1); truncate_inode_pages(&inode->i_data, 0); } void ocfs2_delete_inode(struct inode *inode) { int wipe, status; sigset_t blocked, oldset; struct buffer_head *di_bh = NULL; mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino); if (is_bad_inode(inode)) { mlog(0, "Skipping delete of bad inode\n"); goto bail; } if (!ocfs2_inode_is_valid_to_delete(inode)) { /* It's probably not necessary to truncate_inode_pages * here but we do it for safety anyway (it will most * likely be a no-op anyway) */ ocfs2_cleanup_delete_inode(inode, 0); goto bail; } /* We want to block signals in delete_inode as the lock and * messaging paths may return us -ERESTARTSYS. Which would * cause us to exit early, resulting in inodes being orphaned * forever. */ sigfillset(&blocked); status = sigprocmask(SIG_BLOCK, &blocked, &oldset); if (status < 0) { mlog_errno(status); ocfs2_cleanup_delete_inode(inode, 1); goto bail; } /* Lock down the inode. This gives us an up to date view of * it's metadata (for verification), and allows us to * serialize delete_inode votes. * * Even though we might be doing a truncate, we don't take the * allocation lock here as it won't be needed - nobody will * have the file open. */ status = ocfs2_meta_lock(inode, &di_bh, 1); if (status < 0) { if (status != -ENOENT) mlog_errno(status); ocfs2_cleanup_delete_inode(inode, 0); goto bail_unblock; } /* Query the cluster. This will be the final decision made * before we go ahead and wipe the inode. */ status = ocfs2_query_inode_wipe(inode, di_bh, &wipe); if (!wipe || status < 0) { /* Error and inode busy vote both mean we won't be * removing the inode, so they take almost the same * path. */ if (status < 0) mlog_errno(status); /* Someone in the cluster has voted to not wipe this * inode, or it was never completely orphaned. Write * out the pages and exit now. */ ocfs2_cleanup_delete_inode(inode, 1); goto bail_unlock_inode; } ocfs2_cleanup_delete_inode(inode, 0); status = ocfs2_wipe_inode(inode, di_bh); if (status < 0) { if (status != -EDEADLK) mlog_errno(status); goto bail_unlock_inode; } /* * Mark the inode as successfully deleted. * * This is important for ocfs2_clear_inode() as it will check * this flag and skip any checkpointing work * * ocfs2_stuff_meta_lvb() also uses this flag to invalidate * the LVB for other nodes. */ OCFS2_I(inode)->ip_flags |= OCFS2_INODE_DELETED; bail_unlock_inode: ocfs2_meta_unlock(inode, 1); brelse(di_bh); bail_unblock: status = sigprocmask(SIG_SETMASK, &oldset, NULL); if (status < 0) mlog_errno(status); bail: clear_inode(inode); mlog_exit_void(); } void ocfs2_clear_inode(struct inode *inode) { int status; struct ocfs2_inode_info *oi = OCFS2_I(inode); mlog_entry_void(); if (!inode) goto bail; mlog(0, "Clearing inode: %llu, nlink = %u\n", (unsigned long long)OCFS2_I(inode)->ip_blkno, inode->i_nlink); mlog_bug_on_msg(OCFS2_SB(inode->i_sb) == NULL, "Inode=%lu\n", inode->i_ino); /* For remove delete_inode vote, we hold open lock before, * now it is time to unlock PR and EX open locks. */ ocfs2_open_unlock(inode); /* Do these before all the other work so that we don't bounce * the vote thread while waiting to destroy the locks. */ ocfs2_mark_lockres_freeing(&oi->ip_rw_lockres); ocfs2_mark_lockres_freeing(&oi->ip_meta_lockres); ocfs2_mark_lockres_freeing(&oi->ip_data_lockres); ocfs2_mark_lockres_freeing(&oi->ip_open_lockres); /* We very well may get a clear_inode before all an inodes * metadata has hit disk. Of course, we can't drop any cluster * locks until the journal has finished with it. The only * exception here are successfully wiped inodes - their * metadata can now be considered to be part of the system * inodes from which it came. */ if (!(OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED)) ocfs2_checkpoint_inode(inode); mlog_bug_on_msg(!list_empty(&oi->ip_io_markers), "Clear inode of %llu, inode has io markers\n", (unsigned long long)oi->ip_blkno); ocfs2_extent_map_trunc(inode, 0); status = ocfs2_drop_inode_locks(inode); if (status < 0) mlog_errno(status); ocfs2_lock_res_free(&oi->ip_rw_lockres); ocfs2_lock_res_free(&oi->ip_meta_lockres); ocfs2_lock_res_free(&oi->ip_data_lockres); ocfs2_lock_res_free(&oi->ip_open_lockres); ocfs2_metadata_cache_purge(inode); mlog_bug_on_msg(oi->ip_metadata_cache.ci_num_cached, "Clear inode of %llu, inode has %u cache items\n", (unsigned long long)oi->ip_blkno, oi->ip_metadata_cache.ci_num_cached); mlog_bug_on_msg(!(oi->ip_flags & OCFS2_INODE_CACHE_INLINE), "Clear inode of %llu, inode has a bad flag\n", (unsigned long long)oi->ip_blkno); mlog_bug_on_msg(spin_is_locked(&oi->ip_lock), "Clear inode of %llu, inode is locked\n", (unsigned long long)oi->ip_blkno); mlog_bug_on_msg(!mutex_trylock(&oi->ip_io_mutex), "Clear inode of %llu, io_mutex is locked\n", (unsigned long long)oi->ip_blkno); mutex_unlock(&oi->ip_io_mutex); /* * down_trylock() returns 0, down_write_trylock() returns 1 * kernel 1, world 0 */ mlog_bug_on_msg(!down_write_trylock(&oi->ip_alloc_sem), "Clear inode of %llu, alloc_sem is locked\n", (unsigned long long)oi->ip_blkno); up_write(&oi->ip_alloc_sem); mlog_bug_on_msg(oi->ip_open_count, "Clear inode of %llu has open count %d\n", (unsigned long long)oi->ip_blkno, oi->ip_open_count); /* Clear all other flags. */ oi->ip_flags = OCFS2_INODE_CACHE_INLINE; oi->ip_created_trans = 0; oi->ip_last_trans = 0; oi->ip_dir_start_lookup = 0; oi->ip_blkno = 0ULL; bail: mlog_exit_void(); } /* Called under inode_lock, with no more references on the * struct inode, so it's safe here to check the flags field * and to manipulate i_nlink without any other locks. */ void ocfs2_drop_inode(struct inode *inode) { struct ocfs2_inode_info *oi = OCFS2_I(inode); mlog_entry_void(); mlog(0, "Drop inode %llu, nlink = %u, ip_flags = 0x%x\n", (unsigned long long)oi->ip_blkno, inode->i_nlink, oi->ip_flags); if (oi->ip_flags & OCFS2_INODE_MAYBE_ORPHANED) generic_delete_inode(inode); else generic_drop_inode(inode); mlog_exit_void(); } /* * TODO: this should probably be merged into ocfs2_get_block * * However, you now need to pay attention to the cont_prepare_write() * stuff in ocfs2_get_block (that is, ocfs2_get_block pretty much * expects never to extend). */ struct buffer_head *ocfs2_bread(struct inode *inode, int block, int *err, int reada) { struct buffer_head *bh = NULL; int tmperr; u64 p_blkno; int readflags = OCFS2_BH_CACHED; if (reada) readflags |= OCFS2_BH_READAHEAD; if (((u64)block << inode->i_sb->s_blocksize_bits) >= i_size_read(inode)) { BUG_ON(!reada); return NULL; } down_read(&OCFS2_I(inode)->ip_alloc_sem); tmperr = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL, NULL); up_read(&OCFS2_I(inode)->ip_alloc_sem); if (tmperr < 0) { mlog_errno(tmperr); goto fail; } tmperr = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno, &bh, readflags, inode); if (tmperr < 0) goto fail; tmperr = 0; *err = 0; return bh; fail: if (bh) { brelse(bh); bh = NULL; } *err = -EIO; return NULL; } /* * This is called from our getattr. */ int ocfs2_inode_revalidate(struct dentry *dentry) { struct inode *inode = dentry->d_inode; int status = 0; mlog_entry("(inode = 0x%p, ino = %llu)\n", inode, inode ? (unsigned long long)OCFS2_I(inode)->ip_blkno : 0ULL); if (!inode) { mlog(0, "eep, no inode!\n"); status = -ENOENT; goto bail; } spin_lock(&OCFS2_I(inode)->ip_lock); if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) { spin_unlock(&OCFS2_I(inode)->ip_lock); mlog(0, "inode deleted!\n"); status = -ENOENT; goto bail; } spin_unlock(&OCFS2_I(inode)->ip_lock); /* Let ocfs2_meta_lock do the work of updating our struct * inode for us. */ status = ocfs2_meta_lock(inode, NULL, 0); if (status < 0) { if (status != -ENOENT) mlog_errno(status); goto bail; } ocfs2_meta_unlock(inode, 0); bail: mlog_exit(status); return status; } /* * Updates a disk inode from a * struct inode. * Only takes ip_lock. */ int ocfs2_mark_inode_dirty(handle_t *handle, struct inode *inode, struct buffer_head *bh) { int status; struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data; mlog_entry("(inode %llu)\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); status = ocfs2_journal_access(handle, inode, bh, OCFS2_JOURNAL_ACCESS_WRITE); if (status < 0) { mlog_errno(status); goto leave; } spin_lock(&OCFS2_I(inode)->ip_lock); fe->i_clusters = cpu_to_le32(OCFS2_I(inode)->ip_clusters); ocfs2_get_inode_flags(OCFS2_I(inode)); fe->i_attr = cpu_to_le32(OCFS2_I(inode)->ip_attr); fe->i_dyn_features = cpu_to_le16(OCFS2_I(inode)->ip_dyn_features); spin_unlock(&OCFS2_I(inode)->ip_lock); fe->i_size = cpu_to_le64(i_size_read(inode)); fe->i_links_count = cpu_to_le16(inode->i_nlink); fe->i_uid = cpu_to_le32(inode->i_uid); fe->i_gid = cpu_to_le32(inode->i_gid); fe->i_mode = cpu_to_le16(inode->i_mode); fe->i_atime = cpu_to_le64(inode->i_atime.tv_sec); fe->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec); fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); fe->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec); fe->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); status = ocfs2_journal_dirty(handle, bh); if (status < 0) mlog_errno(status); status = 0; leave: mlog_exit(status); return status; } /* * * Updates a struct inode from a disk inode. * does no i/o, only takes ip_lock. */ void ocfs2_refresh_inode(struct inode *inode, struct ocfs2_dinode *fe) { spin_lock(&OCFS2_I(inode)->ip_lock); OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters); OCFS2_I(inode)->ip_attr = le32_to_cpu(fe->i_attr); OCFS2_I(inode)->ip_dyn_features = le16_to_cpu(fe->i_dyn_features); ocfs2_set_inode_flags(inode); i_size_write(inode, le64_to_cpu(fe->i_size)); inode->i_nlink = le16_to_cpu(fe->i_links_count); inode->i_uid = le32_to_cpu(fe->i_uid); inode->i_gid = le32_to_cpu(fe->i_gid); inode->i_mode = le16_to_cpu(fe->i_mode); if (S_ISLNK(inode->i_mode) && le32_to_cpu(fe->i_clusters) == 0) inode->i_blocks = 0; else inode->i_blocks = ocfs2_inode_sector_count(inode); inode->i_atime.tv_sec = le64_to_cpu(fe->i_atime); inode->i_atime.tv_nsec = le32_to_cpu(fe->i_atime_nsec); inode->i_mtime.tv_sec = le64_to_cpu(fe->i_mtime); inode->i_mtime.tv_nsec = le32_to_cpu(fe->i_mtime_nsec); inode->i_ctime.tv_sec = le64_to_cpu(fe->i_ctime); inode->i_ctime.tv_nsec = le32_to_cpu(fe->i_ctime_nsec); spin_unlock(&OCFS2_I(inode)->ip_lock); }