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ocfs2: Validate metadata only when it's read from disk. 

Add an optional validation hook to ocfs2_read_blocks().  Now the
validation function is only called when a block was actually read off of
disk.  It is not called when the buffer was in cache.

We add a buffer state bit BH_NeedsValidate to flag these buffers.  It
must always be one higher than the last JBD2 buffer state bit.

The dinode, dirblock, extent_block, and xattr_block validators are
lifted to this scheme directly.  The group_descriptor validator needs to
be split into two pieces.  The first part only needs the gd buffer and
is passed to ocfs2_read_block().  The second part requires the dinode as
well, and is called every time.  It's only 3 compares, so it's tiny.
This also allows us to clean up the non-fatal gd check used by resize.c.
It now has no magic argument.

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 14:49:19 -08:00 committed by Mark Fasheh
parent 4ae1d69bed
commit 970e4936d7
10 changed files with 149 additions and 97 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
fs/ocfs2/alloc.c
View File

@ -684,6 +684,9 @@ static int ocfs2_validate_extent_block(struct super_block *sb,
struct ocfs2_extent_block *eb =
(struct ocfs2_extent_block *)bh->b_data;
mlog(0, "Validating extent block %llu\n",
(unsigned long long)bh->b_blocknr);
if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) {
ocfs2_error(sb,
"Extent block #%llu has bad signature %.*s",
@ -719,21 +722,13 @@ int ocfs2_read_extent_block(struct inode *inode, u64 eb_blkno,
int rc;
struct buffer_head *tmp = *bh;
rc = ocfs2_read_block(inode, eb_blkno, &tmp);
if (rc)
goto out;
rc = ocfs2_validate_extent_block(inode->i_sb, tmp);
if (rc) {
brelse(tmp);
goto out;
}
rc = ocfs2_read_block(inode, eb_blkno, &tmp,
ocfs2_validate_extent_block);
/* If ocfs2_read_block() got us a new bh, pass it up. */
if (!*bh)
if (!rc && !*bh)
*bh = tmp;
out:
return rc;
}

33
fs/ocfs2/buffer_head_io.c
View File

@ -39,6 +39,19 @@
#include "buffer_head_io.h"
/*
* Bits on bh->b_state used by ocfs2.
*
* These MUST be after the JBD2 bits. Currently BH_Unshadow is the last
* JBD2 bit.
*/
enum ocfs2_state_bits {
BH_NeedsValidate = BH_Unshadow + 1,
};
/* Expand the magic b_state functions */
BUFFER_FNS(NeedsValidate, needs_validate);
int ocfs2_write_block(struct ocfs2_super *osb, struct buffer_head *bh,
struct inode *inode)
{
@ -166,7 +179,9 @@ bail:
}
int ocfs2_read_blocks(struct inode *inode, u64 block, int nr,
struct buffer_head *bhs[], int flags)
struct buffer_head *bhs[], int flags,
int (*validate)(struct super_block *sb,
struct buffer_head *bh))
{
int status = 0;
int i, ignore_cache = 0;
@ -298,6 +313,8 @@ int ocfs2_read_blocks(struct inode *inode, u64 block, int nr,
clear_buffer_uptodate(bh);
get_bh(bh); /* for end_buffer_read_sync() */
if (validate)
set_buffer_needs_validate(bh);
bh->b_end_io = end_buffer_read_sync;
submit_bh(READ, bh);
continue;
@ -328,6 +345,20 @@ int ocfs2_read_blocks(struct inode *inode, u64 block, int nr,
bhs[i] = NULL;
continue;
}
if (buffer_needs_validate(bh)) {
/* We never set NeedsValidate if the
* buffer was held by the journal, so
* that better not have changed */
BUG_ON(buffer_jbd(bh));
clear_buffer_needs_validate(bh);
status = validate(inode->i_sb, bh);
if (status) {
put_bh(bh);
bhs[i] = NULL;
continue;
}
}
}
/* Always set the buffer in the cache, even if it was

27
fs/ocfs2/buffer_head_io.h
View File

@ -31,21 +31,24 @@
void ocfs2_end_buffer_io_sync(struct buffer_head *bh,
int uptodate);
static inline int ocfs2_read_block(struct inode *inode,
u64 off,
struct buffer_head **bh);
int ocfs2_write_block(struct ocfs2_super *osb,
struct buffer_head *bh,
struct inode *inode);
int ocfs2_read_blocks(struct inode *inode,
u64 block,
int nr,
struct buffer_head *bhs[],
int flags);
int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
unsigned int nr, struct buffer_head *bhs[]);
/*
* If not NULL, validate() will be called on a buffer that is freshly
* read from disk. It will not be called if the buffer was in cache.
* Note that if validate() is being used for this buffer, it needs to
* be set even for a READAHEAD call, as it marks the buffer for later
* validation.
*/
int ocfs2_read_blocks(struct inode *inode, u64 block, int nr,
struct buffer_head *bhs[], int flags,
int (*validate)(struct super_block *sb,
struct buffer_head *bh));
int ocfs2_write_super_or_backup(struct ocfs2_super *osb,
struct buffer_head *bh);
@ -53,7 +56,9 @@ int ocfs2_write_super_or_backup(struct ocfs2_super *osb,
#define OCFS2_BH_READAHEAD 8
static inline int ocfs2_read_block(struct inode *inode, u64 off,
struct buffer_head **bh)
struct buffer_head **bh,
int (*validate)(struct super_block *sb,
struct buffer_head *bh))
{
int status = 0;
@ -63,7 +68,7 @@ static inline int ocfs2_read_block(struct inode *inode, u64 off,
goto bail;
}
status = ocfs2_read_blocks(inode, off, 1, bh, 0);
status = ocfs2_read_blocks(inode, off, 1, bh, 0, validate);
bail:
return status;

13
fs/ocfs2/dir.c
View File

@ -214,6 +214,8 @@ static int ocfs2_validate_dir_block(struct super_block *sb,
* Nothing yet. We don't validate dirents here, that's handled
* in-place when the code walks them.
*/
mlog(0, "Validating dirblock %llu\n",
(unsigned long long)bh->b_blocknr);
return 0;
}
@ -255,20 +257,13 @@ static int ocfs2_read_dir_block(struct inode *inode, u64 v_block,
goto out;
}
rc = ocfs2_read_blocks(inode, p_blkno, 1, &tmp, flags);
rc = ocfs2_read_blocks(inode, p_blkno, 1, &tmp, flags,
ocfs2_validate_dir_block);
if (rc) {
mlog_errno(rc);
goto out;
}
if (!(flags & OCFS2_BH_READAHEAD)) {
rc = ocfs2_validate_dir_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;

18
fs/ocfs2/inode.c
View File

@ -1255,6 +1255,9 @@ int ocfs2_validate_inode_block(struct super_block *sb,
int rc = -EINVAL;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
mlog(0, "Validating dinode %llu\n",
(unsigned long long)bh->b_blocknr);
BUG_ON(!buffer_uptodate(bh));
if (!OCFS2_IS_VALID_DINODE(di)) {
@ -1300,23 +1303,12 @@ int ocfs2_read_inode_block_full(struct inode *inode, struct buffer_head **bh,
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;
}
}
flags, ocfs2_validate_inode_block);
/* If ocfs2_read_blocks() got us a new bh, pass it up. */
if (!*bh)
if (!rc && !*bh)
*bh = tmp;
out:
return rc;
}

2
fs/ocfs2/resize.c
View File

@ -394,7 +394,7 @@ static int ocfs2_check_new_group(struct inode *inode,
(struct ocfs2_group_desc *)group_bh->b_data;
u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc);
ret = ocfs2_validate_group_descriptor(inode->i_sb, di, group_bh, 1);
ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh);
if (ret)
goto out;

4
fs/ocfs2/slot_map.c
View File

@ -151,7 +151,7 @@ int ocfs2_refresh_slot_info(struct ocfs2_super *osb)
* this is not true, the read of -1 (UINT64_MAX) will fail.
*/
ret = ocfs2_read_blocks(si->si_inode, -1, si->si_blocks, si->si_bh,
OCFS2_BH_IGNORE_CACHE);
OCFS2_BH_IGNORE_CACHE, NULL);
if (ret == 0) {
spin_lock(&osb->osb_lock);
ocfs2_update_slot_info(si);
@ -405,7 +405,7 @@ static int ocfs2_map_slot_buffers(struct ocfs2_super *osb,
bh = NULL; /* Acquire a fresh bh */
status = ocfs2_read_blocks(si->si_inode, blkno, 1, &bh,
OCFS2_BH_IGNORE_CACHE);
OCFS2_BH_IGNORE_CACHE, NULL);
if (status < 0) {
mlog_errno(status);
goto bail;

91
fs/ocfs2/suballoc.c
View File

@ -145,14 +145,6 @@ static u32 ocfs2_bits_per_group(struct ocfs2_chain_list *cl)
return (u32)le16_to_cpu(cl->cl_cpg) * (u32)le16_to_cpu(cl->cl_bpc);
}
int ocfs2_validate_group_descriptor(struct super_block *sb,
struct ocfs2_dinode *di,
struct buffer_head *bh,
int clean_error)
{
unsigned int max_bits;
struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
#define do_error(fmt, ...) \
do{ \
if (clean_error) \
@ -161,6 +153,12 @@ int ocfs2_validate_group_descriptor(struct super_block *sb,
ocfs2_error(sb, fmt, ##__VA_ARGS__); \
} while (0)
static int ocfs2_validate_gd_self(struct super_block *sb,
struct buffer_head *bh,
int clean_error)
{
struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
if (!OCFS2_IS_VALID_GROUP_DESC(gd)) {
do_error("Group descriptor #%llu has bad signature %.*s",
(unsigned long long)bh->b_blocknr, 7,
@ -184,6 +182,35 @@ int ocfs2_validate_group_descriptor(struct super_block *sb,
return -EINVAL;
}
if (le16_to_cpu(gd->bg_free_bits_count) > le16_to_cpu(gd->bg_bits)) {
do_error("Group descriptor #%llu has bit count %u but "
"claims that %u are free",
(unsigned long long)bh->b_blocknr,
le16_to_cpu(gd->bg_bits),
le16_to_cpu(gd->bg_free_bits_count));
return -EINVAL;
}
if (le16_to_cpu(gd->bg_bits) > (8 * le16_to_cpu(gd->bg_size))) {
do_error("Group descriptor #%llu has bit count %u but "
"max bitmap bits of %u",
(unsigned long long)bh->b_blocknr,
le16_to_cpu(gd->bg_bits),
8 * le16_to_cpu(gd->bg_size));
return -EINVAL;
}
return 0;
}
static int ocfs2_validate_gd_parent(struct super_block *sb,
struct ocfs2_dinode *di,
struct buffer_head *bh,
int clean_error)
{
unsigned int max_bits;
struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
if (di->i_blkno != gd->bg_parent_dinode) {
do_error("Group descriptor #%llu has bad parent "
"pointer (%llu, expected %llu)",
@ -209,26 +236,35 @@ int ocfs2_validate_group_descriptor(struct super_block *sb,
return -EINVAL;
}
if (le16_to_cpu(gd->bg_free_bits_count) > le16_to_cpu(gd->bg_bits)) {
do_error("Group descriptor #%llu has bit count %u but "
"claims that %u are free",
(unsigned long long)bh->b_blocknr,
le16_to_cpu(gd->bg_bits),
le16_to_cpu(gd->bg_free_bits_count));
return -EINVAL;
}
return 0;
}
if (le16_to_cpu(gd->bg_bits) > (8 * le16_to_cpu(gd->bg_size))) {
do_error("Group descriptor #%llu has bit count %u but "
"max bitmap bits of %u",
(unsigned long long)bh->b_blocknr,
le16_to_cpu(gd->bg_bits),
8 * le16_to_cpu(gd->bg_size));
return -EINVAL;
}
#undef do_error
return 0;
/*
* This version only prints errors. It does not fail the filesystem, and
* exists only for resize.
*/
int ocfs2_check_group_descriptor(struct super_block *sb,
struct ocfs2_dinode *di,
struct buffer_head *bh)
{
int rc;
rc = ocfs2_validate_gd_self(sb, bh, 1);
if (!rc)
rc = ocfs2_validate_gd_parent(sb, di, bh, 1);
return rc;
}
static int ocfs2_validate_group_descriptor(struct super_block *sb,
struct buffer_head *bh)
{
mlog(0, "Validating group descriptor %llu\n",
(unsigned long long)bh->b_blocknr);
return ocfs2_validate_gd_self(sb, bh, 0);
}
int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di,
@ -237,11 +273,12 @@ int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di,
int rc;
struct buffer_head *tmp = *bh;
rc = ocfs2_read_block(inode, gd_blkno, &tmp);
rc = ocfs2_read_block(inode, gd_blkno, &tmp,
ocfs2_validate_group_descriptor);
if (rc)
goto out;
rc = ocfs2_validate_group_descriptor(inode->i_sb, di, tmp, 0);
rc = ocfs2_validate_gd_parent(inode->i_sb, di, tmp, 0);
if (rc) {
brelse(tmp);
goto out;

15
fs/ocfs2/suballoc.h
View File

@ -165,16 +165,15 @@ void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac);
u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster);
/*
* By default, ocfs2_validate_group_descriptor() calls ocfs2_error() when it
* By default, ocfs2_read_group_descriptor() calls ocfs2_error() when it
* finds a problem. A caller that wants to check a group descriptor
* without going readonly passes a nonzero clean_error. This is only
* resize, really. Everyone else should be using
* ocfs2_read_group_descriptor().
* without going readonly should read the block with ocfs2_read_block[s]()
* and then checking it with this function. This is only resize, really.
* Everyone else should be using ocfs2_read_group_descriptor().
*/
int ocfs2_validate_group_descriptor(struct super_block *sb,
struct ocfs2_dinode *di,
struct buffer_head *bh,
int clean_error);
int ocfs2_check_group_descriptor(struct super_block *sb,
struct ocfs2_dinode *di,
struct buffer_head *bh);
/*
* Read a group descriptor block into *bh. If *bh is NULL, a bh will be
* allocated. This is a cached read. The descriptor will be validated with

26
fs/ocfs2/xattr.c
View File

@ -266,7 +266,8 @@ static int ocfs2_read_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
int rc;
rc = ocfs2_read_blocks(bucket->bu_inode, xb_blkno,
bucket->bu_blocks, bucket->bu_bhs, 0);
bucket->bu_blocks, bucket->bu_bhs, 0,
NULL);
if (rc)
ocfs2_xattr_bucket_relse(bucket);
return rc;
@ -359,12 +360,8 @@ static int ocfs2_read_xattr_block(struct inode *inode, u64 xb_blkno,
int rc;
struct buffer_head *tmp = *bh;
rc = ocfs2_read_block(inode, xb_blkno, &tmp);
if (!rc) {
rc = ocfs2_validate_xattr_block(inode->i_sb, tmp);
if (rc)
brelse(tmp);
}
rc = ocfs2_read_block(inode, xb_blkno, &tmp,
ocfs2_validate_xattr_block);
/* If ocfs2_read_block() got us a new bh, pass it up. */
if (!rc && !*bh)
@ -925,7 +922,7 @@ static int ocfs2_xattr_get_value_outside(struct inode *inode,
blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
/* Copy ocfs2_xattr_value */
for (i = 0; i < num_clusters * bpc; i++, blkno++) {
ret = ocfs2_read_block(inode, blkno, &bh);
ret = ocfs2_read_block(inode, blkno, &bh, NULL);
if (ret) {
mlog_errno(ret);
goto out;
@ -1174,7 +1171,7 @@ static int __ocfs2_xattr_set_value_outside(struct inode *inode,
blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
for (i = 0; i < num_clusters * bpc; i++, blkno++) {
ret = ocfs2_read_block(inode, blkno, &bh);
ret = ocfs2_read_block(inode, blkno, &bh, NULL);
if (ret) {
mlog_errno(ret);
goto out;
@ -2206,7 +2203,7 @@ static int ocfs2_calc_xattr_set_need(struct inode *inode,
base = xis->base;
credits += OCFS2_INODE_UPDATE_CREDITS;
} else {
int i, block_off;
int i, block_off = 0;
xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
xe = xbs->here;
name_offset = le16_to_cpu(xe->xe_name_offset);
@ -2840,6 +2837,7 @@ static int ocfs2_find_xe_in_bucket(struct inode *inode,
break;
}
xe_name = bucket_block(bucket, block_off) + new_offset;
if (!memcmp(name, xe_name, name_len)) {
*xe_index = i;
@ -3598,7 +3596,7 @@ static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
goto out;
}
ret = ocfs2_read_block(inode, prev_blkno, &old_bh);
ret = ocfs2_read_block(inode, prev_blkno, &old_bh, NULL);
if (ret < 0) {
mlog_errno(ret);
brelse(new_bh);
@ -3990,7 +3988,7 @@ static int ocfs2_cp_xattr_cluster(struct inode *inode,
ocfs2_journal_dirty(handle, first_bh);
/* update the new bucket header. */
ret = ocfs2_read_block(inode, to_blk_start, &bh);
ret = ocfs2_read_block(inode, to_blk_start, &bh, NULL);
if (ret < 0) {
mlog_errno(ret);
goto out;
@ -4337,7 +4335,7 @@ static int ocfs2_add_new_xattr_bucket(struct inode *inode,
goto out;
}
ret = ocfs2_read_block(inode, p_blkno, &first_bh);
ret = ocfs2_read_block(inode, p_blkno, &first_bh, NULL);
if (ret) {
mlog_errno(ret);
goto out;
@ -4635,7 +4633,7 @@ static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
value_blk += header_bh->b_blocknr;
ret = ocfs2_read_block(inode, value_blk, &value_bh);
ret = ocfs2_read_block(inode, value_blk, &value_bh, NULL);
if (ret) {
mlog_errno(ret);
goto out;