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ocfs2: Fix NULL pointer deref when writing local dquot 

commit_dqblk() can write quota info to global file. That is actually a bad
thing to do because if we are just modifying local quota file, we are not
prepared (do not hold proper locks, do not have transaction credits) to do
a modification of the global quota file. So do not use commit_dqblk() and
instead call our writing function directly.

Acked-by: Joel Becker <Joel.Becker@oracle.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2010-05-13 18:05:15 +02:00
parent 832d09cf14
commit 741e128933
3 changed files with 12 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
fs/ocfs2/quota.h
View File

@ -109,6 +109,7 @@ int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
struct buffer_head **bh);
int ocfs2_create_local_dquot(struct dquot *dquot);
int ocfs2_local_release_dquot(handle_t *handle, struct dquot *dquot);
int ocfs2_local_write_dquot(struct dquot *dquot);
extern const struct dquot_operations ocfs2_quota_operations;
extern struct quota_format_type ocfs2_quota_format;

20
fs/ocfs2/quota_global.c
View File

@ -612,14 +612,13 @@ static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
}
mutex_lock(&sb_dqopt(sb)->dqio_mutex);
status = ocfs2_sync_dquot(dquot);
mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
if (status < 0)
mlog_errno(status);
/* We have to write local structure as well... */
dquot_mark_dquot_dirty(dquot);
status = dquot_commit(dquot);
status = ocfs2_local_write_dquot(dquot);
if (status < 0)
mlog_errno(status);
mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
ocfs2_commit_trans(osb, handle);
out_ilock:
ocfs2_unlock_global_qf(oinfo, 1);
@ -658,7 +657,9 @@ static int ocfs2_write_dquot(struct dquot *dquot)
mlog_errno(status);
goto out;
}
status = dquot_commit(dquot);
mutex_lock(&sb_dqopt(dquot->dq_sb)->dqio_mutex);
status = ocfs2_local_write_dquot(dquot);
mutex_unlock(&sb_dqopt(dquot->dq_sb)->dqio_mutex);
ocfs2_commit_trans(osb, handle);
out:
mlog_exit(status);
@ -831,7 +832,6 @@ static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
struct ocfs2_super *osb = OCFS2_SB(sb);
mlog_entry("id=%u, type=%d", dquot->dq_id, type);
dquot_mark_dquot_dirty(dquot);
/* In case user set some limits, sync dquot immediately to global
* quota file so that information propagates quicker */
@ -856,14 +856,14 @@ static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
}
mutex_lock(&sb_dqopt(sb)->dqio_mutex);
status = ocfs2_sync_dquot(dquot);
mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
if (status < 0) {
mlog_errno(status);
goto out_trans;
goto out_dlock;
}
/* Now write updated local dquot structure */
status = dquot_commit(dquot);
out_trans:
status = ocfs2_local_write_dquot(dquot);
out_dlock:
mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
ocfs2_commit_trans(osb, handle);
out_ilock:
ocfs2_unlock_global_qf(oinfo, 1);
@ -915,7 +915,7 @@ static void ocfs2_destroy_dquot(struct dquot *dquot)
}
const struct dquot_operations ocfs2_quota_operations = {
.write_dquot = ocfs2_write_dquot,
/* We never make dquot dirty so .write_dquot is never called */
.acquire_dquot = ocfs2_acquire_dquot,
.release_dquot = ocfs2_release_dquot,
.mark_dirty = ocfs2_mark_dquot_dirty,

3
fs/ocfs2/quota_local.c
View File

@ -892,7 +892,7 @@ static void olq_set_dquot(struct buffer_head *bh, void *private)
}
/* Write dquot to local quota file */
static int ocfs2_local_write_dquot(struct dquot *dquot)
int ocfs2_local_write_dquot(struct dquot *dquot)
{
struct super_block *sb = dquot->dq_sb;
struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
@ -1309,7 +1309,6 @@ static const struct quota_format_ops ocfs2_format_ops = {
.read_file_info = ocfs2_local_read_info,
.write_file_info = ocfs2_global_write_info,
.free_file_info = ocfs2_local_free_info,
.commit_dqblk = ocfs2_local_write_dquot,
};
struct quota_format_type ocfs2_quota_format = {