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ocfs2: Wrap inode block reads in a dedicated function.

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The ocfs2 code currently reads inodes off disk with a simple
ocfs2_read_block() call.  Each place that does this has a different set
of sanity checks it performs.  Some check only the signature.  A couple
validate the block number (the block read vs di->i_blkno).  A couple
others check for VALID_FL.  Only one place validates i_fs_generation.  A
couple check nothing.  Even when an error is found, they don't all do
the same thing.

We wrap inode reading into ocfs2_read_inode_block().  This will validate
all the above fields, going readonly if they are invalid (they never
should be).  ocfs2_read_inode_block_full() is provided for the places
that want to pass read_block flags.  Every caller is passing a struct
inode with a valid ip_blkno, so we don't need a separate blkno argument
either.

We will remove the validation checks from the rest of the code in a
later commit, as they are no longer necessary.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
This commit is contained in:
Joel Becker 2008-11-13 14:49:11 -08:00 committed by Mark Fasheh
parent a68979b857
commit b657c95c11
12 changed files with 136 additions and 97 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
fs/ocfs2/alloc.c
View file

@ -5658,7 +5658,7 @@ static int ocfs2_get_truncate_log_info(struct ocfs2_super *osb,
goto bail;
}
status = ocfs2_read_block(inode, OCFS2_I(inode)->ip_blkno, &bh);
status = ocfs2_read_inode_block(inode, &bh);
if (status < 0) {
iput(inode);
mlog_errno(status);

11
fs/ocfs2/aops.c
View file

@ -68,20 +68,13 @@ static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock,
goto bail;
}
status = ocfs2_read_block(inode, OCFS2_I(inode)->ip_blkno, &bh);
status = ocfs2_read_inode_block(inode, &bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
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;
}
if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb,
le32_to_cpu(fe->i_clusters))) {
mlog(ML_ERROR, "block offset is outside the allocated size: "
@ -262,7 +255,7 @@ static int ocfs2_readpage_inline(struct inode *inode, struct page *page)
BUG_ON(!PageLocked(page));
BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
ret = ocfs2_read_block(inode, OCFS2_I(inode)->ip_blkno, &di_bh);
ret = ocfs2_read_inode_block(inode, &di_bh);
if (ret) {
mlog_errno(ret);
goto out;

6
fs/ocfs2/dir.c
View file

@ -231,7 +231,7 @@ static struct buffer_head *ocfs2_find_entry_id(const char *name,
struct ocfs2_dinode *di;
struct ocfs2_inline_data *data;
ret = ocfs2_read_block(dir, OCFS2_I(dir)->ip_blkno, &di_bh);
ret = ocfs2_read_inode_block(dir, &di_bh);
if (ret) {
mlog_errno(ret);
goto out;
@ -458,7 +458,7 @@ static inline int ocfs2_delete_entry_id(handle_t *handle,
struct ocfs2_dinode *di;
struct ocfs2_inline_data *data;
ret = ocfs2_read_block(dir, OCFS2_I(dir)->ip_blkno, &di_bh);
ret = ocfs2_read_inode_block(dir, &di_bh);
if (ret) {
mlog_errno(ret);
goto out;
@ -636,7 +636,7 @@ static int ocfs2_dir_foreach_blk_id(struct inode *inode,
struct ocfs2_inline_data *data;
struct ocfs2_dir_entry *de;
ret = ocfs2_read_block(inode, OCFS2_I(inode)->ip_blkno, &di_bh);
ret = ocfs2_read_inode_block(inode, &di_bh);
if (ret) {
mlog(ML_ERROR, "Unable to read inode block for dir %llu\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno);

12
fs/ocfs2/dlmglue.c
View file

@ -2024,7 +2024,7 @@ static int ocfs2_inode_lock_update(struct inode *inode,
} else {
/* Boo, we have to go to disk. */
/* read bh, cast, ocfs2_refresh_inode */
status = ocfs2_read_block(inode, oi->ip_blkno, bh);
status = ocfs2_read_inode_block(inode, bh);
if (status < 0) {
mlog_errno(status);
goto bail_refresh;
@ -2032,18 +2032,14 @@ static int ocfs2_inode_lock_update(struct inode *inode,
fe = (struct ocfs2_dinode *) (*bh)->b_data;
/* This is a good chance to make sure we're not
* locking an invalid object.
* locking an invalid object. ocfs2_read_inode_block()
* already checked that the inode block is sane.
*
* We bug on a stale inode here because we checked
* above whether it was wiped from disk. The wiping
* node provides a guarantee that we receive that
* message and can mark the inode before dropping any
* locks associated with it. */
if (!OCFS2_IS_VALID_DINODE(fe)) {
OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
status = -EIO;
goto bail_refresh;
}
mlog_bug_on_msg(inode->i_generation !=
le32_to_cpu(fe->i_generation),
"Invalid dinode %llu disk generation: %u "
@ -2085,7 +2081,7 @@ static int ocfs2_assign_bh(struct inode *inode,
return 0;
}
status = ocfs2_read_block(inode, OCFS2_I(inode)->ip_blkno, ret_bh);
status = ocfs2_read_inode_block(inode, ret_bh);
if (status < 0)
mlog_errno(status);

2
fs/ocfs2/extent_map.c
View file

@ -630,7 +630,7 @@ int ocfs2_get_clusters(struct inode *inode, u32 v_cluster,
if (ret == 0)
goto out;
ret = ocfs2_read_block(inode, OCFS2_I(inode)->ip_blkno, &di_bh);
ret = ocfs2_read_inode_block(inode, &di_bh);
if (ret) {
mlog_errno(ret);
goto out;

21
fs/ocfs2/file.c
View file

@ -402,12 +402,9 @@ static int ocfs2_truncate_file(struct inode *inode,
(unsigned long long)OCFS2_I(inode)->ip_blkno,
(unsigned long long)new_i_size);
/* We trust di_bh because it comes from ocfs2_inode_lock(), which
* already validated it */
fe = (struct ocfs2_dinode *) di_bh->b_data;
if (!OCFS2_IS_VALID_DINODE(fe)) {
OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
status = -EIO;
goto bail;
}
mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
"Inode %llu, inode i_size = %lld != di "
@ -546,18 +543,12 @@ static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
*/
BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
status = ocfs2_read_block(inode, OCFS2_I(inode)->ip_blkno, &bh);
status = ocfs2_read_inode_block(inode, &bh);
if (status < 0) {
mlog_errno(status);
goto leave;
}
fe = (struct ocfs2_dinode *) bh->b_data;
if (!OCFS2_IS_VALID_DINODE(fe)) {
OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
status = -EIO;
goto leave;
}
restart_all:
BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
@ -1135,9 +1126,8 @@ static int ocfs2_write_remove_suid(struct inode *inode)
{
int ret;
struct buffer_head *bh = NULL;
struct ocfs2_inode_info *oi = OCFS2_I(inode);
ret = ocfs2_read_block(inode, oi->ip_blkno, &bh);
ret = ocfs2_read_inode_block(inode, &bh);
if (ret < 0) {
mlog_errno(ret);
goto out;
@ -1163,8 +1153,7 @@ static int ocfs2_allocate_unwritten_extents(struct inode *inode,
struct buffer_head *di_bh = NULL;
if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
ret = ocfs2_read_block(inode, OCFS2_I(inode)->ip_blkno,
&di_bh);
ret = ocfs2_read_inode_block(inode, &di_bh);
if (ret) {
mlog_errno(ret);
goto out;

136
fs/ocfs2/inode.c
View file

@ -214,12 +214,11 @@ static int ocfs2_init_locked_inode(struct inode *inode, void *opaque)
return 0;
}
int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
int create_ino)
void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
int create_ino)
{
struct super_block *sb;
struct ocfs2_super *osb;
int status = -EINVAL;
int use_plocks = 1;
mlog_entry("(0x%p, size:%llu)\n", inode,
@ -232,25 +231,17 @@ int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
ocfs2_mount_local(osb) || !ocfs2_stack_supports_plocks())
use_plocks = 0;
/* 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;
}
/*
* 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);
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);
@ -354,10 +345,7 @@ int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
ocfs2_set_inode_flags(inode);
status = 0;
bail:
mlog_exit(status);
return status;
mlog_exit_void();
}
static int ocfs2_read_locked_inode(struct inode *inode,
@ -460,11 +448,14 @@ static int ocfs2_read_locked_inode(struct inode *inode,
}
}
if (can_lock)
status = ocfs2_read_blocks(inode, args->fi_blkno, 1, &bh,
OCFS2_BH_IGNORE_CACHE);
else
if (can_lock) {
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 (!status)
status = ocfs2_validate_inode_block(osb->sb, bh);
}
if (status < 0) {
mlog_errno(status);
goto bail;
@ -472,12 +463,6 @@ static int ocfs2_read_locked_inode(struct inode *inode,
status = -EINVAL;
fe = (struct ocfs2_dinode *) bh->b_data;
if (!OCFS2_IS_VALID_DINODE(fe)) {
mlog(0, "Invalid dinode #%llu: signature = %.*s\n",
(unsigned long long)args->fi_blkno, 7,
fe->i_signature);
goto bail;
}
/*
* This is a code bug. Right now the caller needs to
@ -491,10 +476,9 @@ static int ocfs2_read_locked_inode(struct inode *inode,
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));
inode->i_rdev = huge_decode_dev(le64_to_cpu(fe->id1.dev1.i_rdev));
if (ocfs2_populate_inode(inode, fe, 0) < 0)
goto bail;
ocfs2_populate_inode(inode, fe, 0);
BUG_ON(args->fi_blkno != le64_to_cpu(fe->i_blkno));
@ -1264,3 +1248,79 @@ void ocfs2_refresh_inode(struct inode *inode,
spin_unlock(&OCFS2_I(inode)->ip_lock);
}
int ocfs2_validate_inode_block(struct super_block *sb,
struct buffer_head *bh)
{
int rc = -EINVAL;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
BUG_ON(!buffer_uptodate(bh));
if (!OCFS2_IS_VALID_DINODE(di)) {
ocfs2_error(sb, "Invalid dinode #%llu: signature = %.*s\n",
(unsigned long long)bh->b_blocknr, 7,
di->i_signature);
goto bail;
}
if (le64_to_cpu(di->i_blkno) != bh->b_blocknr) {
ocfs2_error(sb, "Invalid dinode #%llu: i_blkno is %llu\n",
(unsigned long long)bh->b_blocknr,
(unsigned long long)le64_to_cpu(di->i_blkno));
goto bail;
}
if (!(di->i_flags & cpu_to_le32(OCFS2_VALID_FL))) {
ocfs2_error(sb,
"Invalid dinode #%llu: OCFS2_VALID_FL not set\n",
(unsigned long long)bh->b_blocknr);
goto bail;
}
if (le32_to_cpu(di->i_fs_generation) !=
OCFS2_SB(sb)->fs_generation) {
ocfs2_error(sb,
"Invalid dinode #%llu: fs_generation is %u\n",
(unsigned long long)bh->b_blocknr,
le32_to_cpu(di->i_fs_generation));
goto bail;
}
rc = 0;
bail:
return rc;
}
int ocfs2_read_inode_block_full(struct inode *inode, struct buffer_head **bh,
int flags)
{
int rc;
struct buffer_head *tmp = *bh;
rc = ocfs2_read_blocks(inode, OCFS2_I(inode)->ip_blkno, 1, &tmp,
flags);
if (rc)
goto out;
if (!(flags & OCFS2_BH_READAHEAD)) {
rc = ocfs2_validate_inode_block(inode->i_sb, tmp);
if (rc) {
brelse(tmp);
goto out;
}
}
/* If ocfs2_read_blocks() got us a new bh, pass it up. */
if (!*bh)
*bh = tmp;
out:
return rc;
}
int ocfs2_read_inode_block(struct inode *inode, struct buffer_head **bh)
{
return ocfs2_read_inode_block_full(inode, bh, 0);
}

16
fs/ocfs2/inode.h
View file

@ -128,8 +128,8 @@ struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 feoff, unsigned flags,
int sysfile_type);
int ocfs2_inode_init_private(struct inode *inode);
int ocfs2_inode_revalidate(struct dentry *dentry);
int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
int create_ino);
void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
int create_ino);
void ocfs2_read_inode(struct inode *inode);
void ocfs2_read_inode2(struct inode *inode, void *opaque);
ssize_t ocfs2_rw_direct(int rw, struct file *filp, char *buf,
@ -153,4 +153,16 @@ static inline blkcnt_t ocfs2_inode_sector_count(struct inode *inode)
return (blkcnt_t)(OCFS2_I(inode)->ip_clusters << c_to_s_bits);
}
/* Validate that a bh contains a valid inode */
int ocfs2_validate_inode_block(struct super_block *sb,
struct buffer_head *bh);
/*
* Read an inode block into *bh. If *bh is NULL, a bh will be allocated.
* This is a cached read. The inode will be validated with
* ocfs2_validate_inode_block().
*/
int ocfs2_read_inode_block(struct inode *inode, struct buffer_head **bh);
/* The same, but can be passed OCFS2_BH_* flags */
int ocfs2_read_inode_block_full(struct inode *inode, struct buffer_head **bh,
int flags);
#endif /* OCFS2_INODE_H */

3
fs/ocfs2/journal.c
View file

@ -1135,8 +1135,7 @@ static int ocfs2_read_journal_inode(struct ocfs2_super *osb,
}
SET_INODE_JOURNAL(inode);
status = ocfs2_read_blocks(inode, OCFS2_I(inode)->ip_blkno, 1, bh,
OCFS2_BH_IGNORE_CACHE);
status = ocfs2_read_inode_block_full(inode, bh, OCFS2_BH_IGNORE_CACHE);
if (status < 0) {
mlog_errno(status);
goto bail;

8
fs/ocfs2/localalloc.c
View file

@ -248,8 +248,8 @@ int ocfs2_load_local_alloc(struct ocfs2_super *osb)
goto bail;
}
status = ocfs2_read_blocks(inode, OCFS2_I(inode)->ip_blkno, 1,
&alloc_bh, OCFS2_BH_IGNORE_CACHE);
status = ocfs2_read_inode_block_full(inode, &alloc_bh,
OCFS2_BH_IGNORE_CACHE);
if (status < 0) {
mlog_errno(status);
goto bail;
@ -459,8 +459,8 @@ int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
mutex_lock(&inode->i_mutex);
status = ocfs2_read_blocks(inode, OCFS2_I(inode)->ip_blkno, 1,
&alloc_bh, OCFS2_BH_IGNORE_CACHE);
status = ocfs2_read_inode_block_full(inode, &alloc_bh,
OCFS2_BH_IGNORE_CACHE);
if (status < 0) {
mlog_errno(status);
goto bail;

14
fs/ocfs2/namei.c
View file

@ -531,15 +531,7 @@ static int ocfs2_mknod_locked(struct ocfs2_super *osb,
goto leave;
}
if (ocfs2_populate_inode(inode, fe, 1) < 0) {
mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, "
"i_blkno=%llu, i_ino=%lu\n",
(unsigned long long)(*new_fe_bh)->b_blocknr,
(unsigned long long)le64_to_cpu(fe->i_blkno),
inode->i_ino);
BUG();
}
ocfs2_populate_inode(inode, fe, 1);
ocfs2_inode_set_new(osb, inode);
if (!ocfs2_mount_local(osb)) {
status = ocfs2_create_new_inode_locks(inode);
@ -1864,9 +1856,7 @@ static int ocfs2_orphan_add(struct ocfs2_super *osb,
mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
status = ocfs2_read_block(orphan_dir_inode,
OCFS2_I(orphan_dir_inode)->ip_blkno,
&orphan_dir_bh);
status = ocfs2_read_inode_block(orphan_dir_inode, &orphan_dir_bh);
if (status < 0) {
mlog_errno(status);
goto leave;

2
fs/ocfs2/symlink.c
View file

@ -84,7 +84,7 @@ static char *ocfs2_fast_symlink_getlink(struct inode *inode,
mlog_entry_void();
status = ocfs2_read_block(inode, OCFS2_I(inode)->ip_blkno, bh);
status = ocfs2_read_inode_block(inode, bh);
if (status < 0) {
mlog_errno(status);
link = ERR_PTR(status);