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Subject[PATCH 31/56] ocfs2: Fix ocfs2_read_quota_block() error handling.
Date
From: Joel Becker <Joel.Becker@oracle.com>

ocfs2_bread() has become ocfs2_read_virt_blocks(), with a prototype to
match ocfs2_read_blocks(). The quota code, converting from
ocfs2_bread(), wraps the call to ocfs2_read_virt_blocks() in
ocfs2_read_quota_block(). Unfortunately, the prototype of
ocfs2_read_quota_block() matches the old prototype of ocfs2_bread().

The problem is that ocfs2_bread() returned the buffer head, and callers
assumed that a NULL pointer was indicative of error. It wasn't. This
is why ocfs2_bread() took an int*err argument as well.

The new prototype of ocfs2_read_virt_blocks() avoids this error handling
confusion. Let's change ocfs2_read_quota_block() to match.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Acked-by: Jan Kara <jack@suse.cz>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
---
fs/ocfs2/dlmglue.c | 6 ++--
fs/ocfs2/quota.h | 4 +-
fs/ocfs2/quota_global.c | 34 ++++++++++++++----------
fs/ocfs2/quota_local.c | 64 +++++++++++++++++++++++++---------------------
4 files changed, 60 insertions(+), 48 deletions(-)
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 058aa86..b1c7591 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -3519,7 +3519,7 @@ static int ocfs2_refresh_qinfo(struct ocfs2_mem_dqinfo *oinfo)
oinfo->dqi_gi.dqi_type);
struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock;
struct ocfs2_qinfo_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
- struct buffer_head *bh;
+ struct buffer_head *bh = NULL;
struct ocfs2_global_disk_dqinfo *gdinfo;
int status = 0;

@@ -3532,8 +3532,8 @@ static int ocfs2_refresh_qinfo(struct ocfs2_mem_dqinfo *oinfo)
oinfo->dqi_gi.dqi_free_entry =
be32_to_cpu(lvb->lvb_free_entry);
} else {
- bh = ocfs2_read_quota_block(oinfo->dqi_gqinode, 0, &status);
- if (!bh) {
+ status = ocfs2_read_quota_block(oinfo->dqi_gqinode, 0, &bh);
+ if (status) {
mlog_errno(status);
goto bail;
}
diff --git a/fs/ocfs2/quota.h b/fs/ocfs2/quota.h
index 84c50a1..abf6941 100644
--- a/fs/ocfs2/quota.h
+++ b/fs/ocfs2/quota.h
@@ -108,8 +108,8 @@ static inline int ocfs2_global_release_dquot(struct dquot *dquot)

int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
-struct buffer_head *ocfs2_read_quota_block(struct inode *inode,
- int block, int *err);
+int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
+ struct buffer_head **bh);

extern struct dquot_operations ocfs2_quota_operations;
extern struct quota_format_type ocfs2_quota_format;
diff --git a/fs/ocfs2/quota_global.c b/fs/ocfs2/quota_global.c
index 7f561e4..1401edf 100644
--- a/fs/ocfs2/quota_global.c
+++ b/fs/ocfs2/quota_global.c
@@ -85,16 +85,21 @@ struct qtree_fmt_operations ocfs2_global_ops = {
.is_id = ocfs2_global_is_id,
};

-struct buffer_head *ocfs2_read_quota_block(struct inode *inode,
- int block, int *err)
+int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
+ struct buffer_head **bh)
{
- struct buffer_head *tmp = NULL;
+ int rc = 0;
+ struct buffer_head *tmp = *bh;

- *err = ocfs2_read_virt_blocks(inode, block, 1, &tmp, 0, NULL);
- if (*err)
- mlog_errno(*err);
+ rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, 0, NULL);
+ if (rc)
+ mlog_errno(rc);
+
+ /* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */
+ if (!rc && !*bh)
+ *bh = tmp;

- return tmp;
+ return rc;
}

static struct buffer_head *ocfs2_get_quota_block(struct inode *inode,
@@ -141,8 +146,9 @@ ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
toread = len;
while (toread > 0) {
tocopy = min((size_t)(sb->s_blocksize - offset), toread);
- bh = ocfs2_read_quota_block(gqinode, blk, &err);
- if (!bh) {
+ bh = NULL;
+ err = ocfs2_read_quota_block(gqinode, blk, &bh);
+ if (err) {
mlog_errno(err);
return err;
}
@@ -167,7 +173,7 @@ ssize_t ocfs2_quota_write(struct super_block *sb, int type,
int offset = off & (sb->s_blocksize - 1);
sector_t blk = off >> sb->s_blocksize_bits;
int err = 0, new = 0;
- struct buffer_head *bh;
+ struct buffer_head *bh = NULL;
handle_t *handle = journal_current_handle();

if (!handle) {
@@ -198,13 +204,13 @@ ssize_t ocfs2_quota_write(struct super_block *sb, int type,
/* Not rewriting whole block? */
if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
!new) {
- bh = ocfs2_read_quota_block(gqinode, blk, &err);
- if (!bh) {
+ err = ocfs2_read_quota_block(gqinode, blk, &bh);
+ if (err) {
mlog_errno(err);
return err;
}
err = ocfs2_journal_access(handle, gqinode, bh,
- OCFS2_JOURNAL_ACCESS_WRITE);
+ OCFS2_JOURNAL_ACCESS_WRITE);
} else {
bh = ocfs2_get_quota_block(gqinode, blk, &err);
if (!bh) {
@@ -212,7 +218,7 @@ ssize_t ocfs2_quota_write(struct super_block *sb, int type,
return err;
}
err = ocfs2_journal_access(handle, gqinode, bh,
- OCFS2_JOURNAL_ACCESS_CREATE);
+ OCFS2_JOURNAL_ACCESS_CREATE);
}
if (err < 0) {
brelse(bh);
diff --git a/fs/ocfs2/quota_local.c b/fs/ocfs2/quota_local.c
index 54e8788..c008dd9 100644
--- a/fs/ocfs2/quota_local.c
+++ b/fs/ocfs2/quota_local.c
@@ -139,15 +139,15 @@ static int ocfs2_local_check_quota_file(struct super_block *sb, int type)
unsigned int gversions[MAXQUOTAS] = OCFS2_GLOBAL_QVERSIONS;
unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
GROUP_QUOTA_SYSTEM_INODE };
- struct buffer_head *bh;
+ struct buffer_head *bh = NULL;
struct inode *linode = sb_dqopt(sb)->files[type];
struct inode *ginode = NULL;
struct ocfs2_disk_dqheader *dqhead;
int status, ret = 0;

/* First check whether we understand local quota file */
- bh = ocfs2_read_quota_block(linode, 0, &status);
- if (!bh) {
+ status = ocfs2_read_quota_block(linode, 0, &bh);
+ if (status) {
mlog_errno(status);
mlog(ML_ERROR, "failed to read quota file header (type=%d)\n",
type);
@@ -178,8 +178,8 @@ static int ocfs2_local_check_quota_file(struct super_block *sb, int type)
goto out_err;
}
/* Since the header is read only, we don't care about locking */
- bh = ocfs2_read_quota_block(ginode, 0, &status);
- if (!bh) {
+ status = ocfs2_read_quota_block(ginode, 0, &bh);
+ if (status) {
mlog_errno(status);
mlog(ML_ERROR, "failed to read global quota file header "
"(type=%d)\n", type);
@@ -235,10 +235,11 @@ static int ocfs2_load_local_quota_bitmaps(struct inode *inode,
return -ENOMEM;
}
newchunk->qc_num = i;
- newchunk->qc_headerbh = ocfs2_read_quota_block(inode,
+ newchunk->qc_headerbh = NULL;
+ status = ocfs2_read_quota_block(inode,
ol_quota_chunk_block(inode->i_sb, i),
- &status);
- if (!newchunk->qc_headerbh) {
+ &newchunk->qc_headerbh);
+ if (status) {
mlog_errno(status);
kmem_cache_free(ocfs2_qf_chunk_cachep, newchunk);
ocfs2_release_local_quota_bitmaps(head);
@@ -320,10 +321,11 @@ static int ocfs2_recovery_load_quota(struct inode *lqinode,
int status = 0;

for (i = 0; i < chunks; i++) {
- hbh = ocfs2_read_quota_block(lqinode,
- ol_quota_chunk_block(sb, i),
- &status);
- if (!hbh) {
+ hbh = NULL;
+ status = ocfs2_read_quota_block(lqinode,
+ ol_quota_chunk_block(sb, i),
+ &hbh);
+ if (status) {
mlog_errno(status);
break;
}
@@ -392,8 +394,9 @@ struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
goto out_put;
}
/* Now read local header */
- bh = ocfs2_read_quota_block(lqinode, 0, &status);
- if (!bh) {
+ bh = NULL;
+ status = ocfs2_read_quota_block(lqinode, 0, &bh);
+ if (status) {
mlog_errno(status);
mlog(ML_ERROR, "failed to read quota file info header "
"(slot=%d type=%d)\n", slot_num, type);
@@ -447,19 +450,21 @@ static int ocfs2_recover_local_quota_file(struct inode *lqinode,

list_for_each_entry_safe(rchunk, next, &(rec->r_list[type]), rc_list) {
chunk = rchunk->rc_chunk;
- hbh = ocfs2_read_quota_block(lqinode,
- ol_quota_chunk_block(sb, chunk),
- &status);
- if (!hbh) {
+ hbh = NULL;
+ status = ocfs2_read_quota_block(lqinode,
+ ol_quota_chunk_block(sb, chunk),
+ &hbh);
+ if (status) {
mlog_errno(status);
break;
}
dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
for_each_bit(bit, rchunk->rc_bitmap, ol_chunk_entries(sb)) {
- qbh = ocfs2_read_quota_block(lqinode,
+ qbh = NULL;
+ status = ocfs2_read_quota_block(lqinode,
ol_dqblk_block(sb, chunk, bit),
- &status);
- if (!qbh) {
+ &qbh);
+ if (status) {
mlog_errno(status);
break;
}
@@ -581,8 +586,9 @@ int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
goto out_put;
}
/* Now read local header */
- bh = ocfs2_read_quota_block(lqinode, 0, &status);
- if (!bh) {
+ bh = NULL;
+ status = ocfs2_read_quota_block(lqinode, 0, &bh);
+ if (status) {
mlog_errno(status);
mlog(ML_ERROR, "failed to read quota file info header "
"(slot=%d type=%d)\n", slot_num, type);
@@ -676,8 +682,8 @@ static int ocfs2_local_read_info(struct super_block *sb, int type)
locked = 1;

/* Now read local header */
- bh = ocfs2_read_quota_block(lqinode, 0, &status);
- if (!bh) {
+ status = ocfs2_read_quota_block(lqinode, 0, &bh);
+ if (status) {
mlog_errno(status);
mlog(ML_ERROR, "failed to read quota file info header "
"(type=%d)\n", type);
@@ -850,13 +856,13 @@ static int ocfs2_local_write_dquot(struct dquot *dquot)
{
struct super_block *sb = dquot->dq_sb;
struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
- struct buffer_head *bh;
+ struct buffer_head *bh = NULL;
int status;

- bh = ocfs2_read_quota_block(sb_dqopt(sb)->files[dquot->dq_type],
+ status = ocfs2_read_quota_block(sb_dqopt(sb)->files[dquot->dq_type],
ol_dqblk_file_block(sb, od->dq_local_off),
- &status);
- if (!bh) {
+ &bh);
+ if (status) {
mlog_errno(status);
goto out;
}
--
1.5.6


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