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inode.c
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inode.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/* -*- 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.
*/
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/quotaops.h>
#include <linux/iversion.h>
#include <asm/byteorder.h>
#include <cluster/masklog.h>
#include "ocfs2.h"
#include "alloc.h"
#include "dir.h"
#include "blockcheck.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 "xattr.h"
#include "refcounttree.h"
#include "ocfs2_trace.h"
#include "filecheck.h"
#include "buffer_head_io.h"
struct ocfs2_find_inode_args
{
u64 fi_blkno;
unsigned long fi_ino;
unsigned int fi_flags;
unsigned int fi_sysfile_type;
};
static struct lock_class_key ocfs2_sysfile_lock_key[NUM_SYSTEM_INODES];
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);
static int ocfs2_filecheck_read_inode_block_full(struct inode *inode,
struct buffer_head **bh,
int flags, int type);
static int ocfs2_filecheck_validate_inode_block(struct super_block *sb,
struct buffer_head *bh);
static int ocfs2_filecheck_repair_inode_block(struct super_block *sb,
struct buffer_head *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_ilookup(struct super_block *sb, u64 blkno)
{
struct ocfs2_find_inode_args args;
args.fi_blkno = blkno;
args.fi_flags = 0;
args.fi_ino = ino_from_blkno(sb, blkno);
args.fi_sysfile_type = 0;
return ilookup5(sb, blkno, ocfs2_find_actor, &args);
}
struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 blkno, unsigned flags,
int sysfile_type)
{
int rc = -ESTALE;
struct inode *inode = NULL;
struct super_block *sb = osb->sb;
struct ocfs2_find_inode_args args;
journal_t *journal = OCFS2_SB(sb)->journal->j_journal;
trace_ocfs2_iget_begin((unsigned long long)blkno, flags,
sysfile_type);
/* 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);
args.fi_sysfile_type = sysfile_type;
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 == NULL) {
inode = ERR_PTR(-ENOMEM);
mlog_errno(PTR_ERR(inode));
goto bail;
}
trace_ocfs2_iget5_locked(inode->i_state);
if (inode->i_state & I_NEW) {
rc = ocfs2_read_locked_inode(inode, &args);
unlock_new_inode(inode);
}
if (is_bad_inode(inode)) {
iput(inode);
inode = ERR_PTR(rc);
goto bail;
}
/*
* Set transaction id's of transactions that have to be committed
* to finish f[data]sync. We set them to currently running transaction
* as we cannot be sure that the inode or some of its metadata isn't
* part of the transaction - the inode could have been reclaimed and
* now it is reread from disk.
*/
if (journal) {
transaction_t *transaction;
tid_t tid;
struct ocfs2_inode_info *oi = OCFS2_I(inode);
read_lock(&journal->j_state_lock);
if (journal->j_running_transaction)
transaction = journal->j_running_transaction;
else
transaction = journal->j_committing_transaction;
if (transaction)
tid = transaction->t_tid;
else
tid = journal->j_commit_sequence;
read_unlock(&journal->j_state_lock);
oi->i_sync_tid = tid;
oi->i_datasync_tid = tid;
}
bail:
if (!IS_ERR(inode)) {
trace_ocfs2_iget_end(inode,
(unsigned long long)OCFS2_I(inode)->ip_blkno);
}
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;
args = opaque;
mlog_bug_on_msg(!inode, "No inode in find actor!\n");
trace_ocfs2_find_actor(inode, inode->i_ino, opaque, args->fi_blkno);
if (oi->ip_blkno != args->fi_blkno)
goto bail;
ret = 1;
bail:
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;
static struct lock_class_key ocfs2_quota_ip_alloc_sem_key,
ocfs2_file_ip_alloc_sem_key;
inode->i_ino = args->fi_ino;
OCFS2_I(inode)->ip_blkno = args->fi_blkno;
if (args->fi_sysfile_type != 0)
lockdep_set_class(&inode->i_rwsem,
&ocfs2_sysfile_lock_key[args->fi_sysfile_type]);
if (args->fi_sysfile_type == USER_QUOTA_SYSTEM_INODE ||
args->fi_sysfile_type == GROUP_QUOTA_SYSTEM_INODE ||
args->fi_sysfile_type == LOCAL_USER_QUOTA_SYSTEM_INODE ||
args->fi_sysfile_type == LOCAL_GROUP_QUOTA_SYSTEM_INODE)
lockdep_set_class(&OCFS2_I(inode)->ip_alloc_sem,
&ocfs2_quota_ip_alloc_sem_key);
else
lockdep_set_class(&OCFS2_I(inode)->ip_alloc_sem,
&ocfs2_file_ip_alloc_sem_key);
return 0;
}
void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
int create_ino)
{
struct super_block *sb;
struct ocfs2_super *osb;
int use_plocks = 1;
sb = inode->i_sb;
osb = OCFS2_SB(sb);
if ((osb->s_mount_opt & OCFS2_MOUNT_LOCALFLOCKS) ||
ocfs2_mount_local(osb) || !ocfs2_stack_supports_plocks())
use_plocks = 0;
/*
* These have all been checked by ocfs2_read_inode_block() or set
* by ocfs2_mknod_locked(), so a failure is a code bug.
*/
BUG_ON(!OCFS2_IS_VALID_DINODE(fe)); /* This means that read_inode
cannot create a superblock
inode today. change if
that is needed. */
BUG_ON(!(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)));
BUG_ON(le32_to_cpu(fe->i_fs_generation) != osb->fs_generation);
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_set_iversion(inode, 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);
i_uid_write(inode, le32_to_cpu(fe->i_uid));
i_gid_write(inode, 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;
inode->i_mapping->a_ops = &ocfs2_fast_symlink_aops;
} 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));
set_nlink(inode, ocfs2_read_links_count(fe));
trace_ocfs2_populate_inode(OCFS2_I(inode)->ip_blkno,
le32_to_cpu(fe->i_flags));
if (fe->i_flags & cpu_to_le32(OCFS2_SYSTEM_FL)) {
OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SYSTEM_FILE;
inode->i_flags |= S_NOQUOTA;
}
if (fe->i_flags & cpu_to_le32(OCFS2_LOCAL_ALLOC_FL)) {
OCFS2_I(inode)->ip_flags |= OCFS2_INODE_BITMAP;
} 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_QUOTA_FL)) {
inode->i_flags |= S_NOQUOTA;
} else if (fe->i_flags & cpu_to_le32(OCFS2_SUPER_BLOCK_FL)) {
/* we can't actually hit this as read_inode can't
* handle superblocks today ;-) */
BUG();
}
switch (inode->i_mode & S_IFMT) {
case S_IFREG:
if (use_plocks)
inode->i_fop = &ocfs2_fops;
else
inode->i_fop = &ocfs2_fops_no_plocks;
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;
if (use_plocks)
inode->i_fop = &ocfs2_dops;
else
inode->i_fop = &ocfs2_dops_no_plocks;
i_size_write(inode, le64_to_cpu(fe->i_size));
OCFS2_I(inode)->ip_dir_lock_gen = 1;
break;
case S_IFLNK:
inode->i_op = &ocfs2_symlink_inode_operations;
inode_nohighmem(inode);
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_inode_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_set_inode_flags(inode);
OCFS2_I(inode)->ip_last_used_slot = 0;
OCFS2_I(inode)->ip_last_used_group = 0;
if (S_ISDIR(inode->i_mode))
ocfs2_resv_set_type(&OCFS2_I(inode)->ip_la_data_resv,
OCFS2_RESV_FLAG_DIR);
}
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, lock_level = 0;
u32 generation = 0;
status = -EINVAL;
sb = inode->i_sb;
osb = OCFS2_SB(sb);
/*
* 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-accessible 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);
trace_ocfs2_read_locked_inode(
(unsigned long long)OCFS2_I(inode)->ip_blkno, can_lock);
/*
* 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_inode_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_inode_lock(inode, NULL, lock_level);
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;
}
}
if (can_lock) {
if (args->fi_flags & OCFS2_FI_FLAG_FILECHECK_CHK)
status = ocfs2_filecheck_read_inode_block_full(inode,
&bh, OCFS2_BH_IGNORE_CACHE, 0);
else if (args->fi_flags & OCFS2_FI_FLAG_FILECHECK_FIX)
status = ocfs2_filecheck_read_inode_block_full(inode,
&bh, OCFS2_BH_IGNORE_CACHE, 1);
else
status = ocfs2_read_inode_block_full(inode,
&bh, OCFS2_BH_IGNORE_CACHE);
} else {
status = ocfs2_read_blocks_sync(osb, args->fi_blkno, 1, &bh);
/*
* If buffer is in jbd, then its checksum may not have been
* computed as yet.
*/
if (!status && !buffer_jbd(bh)) {
if (args->fi_flags & OCFS2_FI_FLAG_FILECHECK_CHK)
status = ocfs2_filecheck_validate_inode_block(
osb->sb, bh);
else if (args->fi_flags & OCFS2_FI_FLAG_FILECHECK_FIX)
status = ocfs2_filecheck_repair_inode_block(
osb->sb, bh);
else
status = ocfs2_validate_inode_block(
osb->sb, bh);
}
}
if (status < 0) {
mlog_errno(status);
goto bail;
}
status = -EINVAL;
fe = (struct ocfs2_dinode *) bh->b_data;
/*
* 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 ambiguous\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));
ocfs2_populate_inode(inode, fe, 0);
BUG_ON(args->fi_blkno != le64_to_cpu(fe->i_blkno));
if (buffer_dirty(bh) && !buffer_jbd(bh)) {
if (can_lock) {
ocfs2_inode_unlock(inode, lock_level);
lock_level = 1;
ocfs2_inode_lock(inode, NULL, lock_level);
}
status = ocfs2_write_block(osb, bh, INODE_CACHE(inode));
if (status < 0) {
mlog_errno(status);
goto bail;
}
}
status = 0;
bail:
if (can_lock)
ocfs2_inode_unlock(inode, lock_level);
if (status < 0)
make_bad_inode(inode);
brelse(bh);
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_dinode *fe;
handle_t *handle = NULL;
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) {
if (ocfs2_should_order_data(inode))
ocfs2_begin_ordered_truncate(inode, 0);
handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;
mlog_errno(status);
goto out;
}
status = ocfs2_journal_access_di(handle, INODE_CACHE(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_commit_truncate(osb, inode, fe_bh);
if (status < 0)
mlog_errno(status);
}
out:
if (handle)
ocfs2_commit_trans(osb, handle);
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 = -ENOENT;
mlog_errno(status);
goto bail;
}
inode_lock(inode_alloc_inode);
status = ocfs2_inode_lock(inode_alloc_inode, &inode_alloc_bh, 1);
if (status < 0) {
inode_unlock(inode_alloc_inode);
mlog_errno(status);
goto bail;
}
handle = ocfs2_start_trans(osb, OCFS2_DELETE_INODE_CREDITS +
ocfs2_quota_trans_credits(inode->i_sb));
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
mlog_errno(status);
goto bail_unlock;
}
if (!(OCFS2_I(inode)->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)) {
status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
orphan_dir_bh, false);
if (status < 0) {
mlog_errno(status);
goto bail_commit;
}
}
/* set the inodes dtime */
status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto bail_commit;
}
di->i_dtime = cpu_to_le64(ktime_get_real_seconds());
di->i_flags &= cpu_to_le32(~(OCFS2_VALID_FL | OCFS2_ORPHANED_FL));
ocfs2_journal_dirty(handle, di_bh);
ocfs2_remove_from_cache(INODE_CACHE(inode), di_bh);
dquot_free_inode(inode);
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_inode_unlock(inode_alloc_inode, 1);
inode_unlock(inode_alloc_inode);
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)) {
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);
trace_ocfs2_check_orphan_recovery_state(slot, ret);
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 = -1;
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 = (struct ocfs2_dinode *) di_bh->b_data;
if (!(OCFS2_I(inode)->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)) {
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 = -ENOENT;
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. */
inode_lock(orphan_dir_inode);
status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
if (status < 0) {
inode_unlock(orphan_dir_inode);
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 try an
* inode delete underneath 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;
}
/* Remove any dir index tree */
if (S_ISDIR(inode->i_mode)) {
status = ocfs2_dx_dir_truncate(inode, di_bh);
if (status) {
mlog_errno(status);
goto bail_unlock_dir;
}
}
/*Free extended attribute resources associated with this inode.*/
status = ocfs2_xattr_remove(inode, di_bh);
if (status < 0) {
mlog_errno(status);
goto bail_unlock_dir;
}
status = ocfs2_remove_refcount_tree(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:
if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)
return status;
ocfs2_inode_unlock(orphan_dir_inode, 1);
inode_unlock(orphan_dir_inode);
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
* trylock 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);
trace_ocfs2_inode_is_valid_to_delete(current, osb->dc_task,
(unsigned long long)oi->ip_blkno,
oi->ip_flags);
/* 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 downconvert_thread we can't go into our own
* voting [hello, deadlock city!] so we cannot delete the inode. But
* since we dropped last inode ref when downconverting dentry lock,
* we cannot have the file open and thus the node doing unlink will
* take care of deleting the inode.
*/
if (current == osb->dc_task)
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;
}
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, reason = 0;
struct ocfs2_inode_info *oi = OCFS2_I(inode);
struct ocfs2_dinode *di;
*wipe = 0;
trace_ocfs2_query_inode_wipe_begin((unsigned long long)oi->ip_blkno,
inode->i_nlink);
/* 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)) {
reason = 1;
goto bail;
}
/* Now that we have an up to date inode, we can double check
* the link count. */
if (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)) &&
!(oi->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)) {
/*
* Inodes in the orphan dir must have ORPHANED_FL. The only
* inodes that come back out of the orphan dir are reflink
* targets. A reflink target may be moved out of the orphan
* dir between the time we scan the directory and the time we
* process it. This would lead to HAS_REFCOUNT_FL being set but
* ORPHANED_FL not.
*/
if (di->i_dyn_features & cpu_to_le16(OCFS2_HAS_REFCOUNT_FL)) {
reason = 2;
goto bail;
}
/* 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 succeeds, 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;
reason = 3;
goto bail;
}
if (status < 0) {
mlog_errno(status);
goto bail;
}
*wipe = 1;
trace_ocfs2_query_inode_wipe_succ(le16_to_cpu(di->i_orphaned_slot));
bail:
trace_ocfs2_query_inode_wipe_end(status, reason);
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)
{
trace_ocfs2_cleanup_delete_inode(
(unsigned long long)OCFS2_I(inode)->ip_blkno, sync_data);
if (sync_data)
filemap_write_and_wait(inode->i_mapping);
truncate_inode_pages_final(&inode->i_data);
}
static void ocfs2_delete_inode(struct inode *inode)
{
int wipe, status;
sigset_t oldset;
struct buffer_head *di_bh = NULL;
struct ocfs2_dinode *di = NULL;