Commit 52a9ee28 authored by Jan Kara's avatar Jan Kara

ocfs2: Use __dquot_transfer to avoid lock inversion

dquot_transfer() acquires own references to dquots via dqget(). Thus it waits
for dq_lock which creates a lock inversion because dq_lock ranks above
transaction start but transaction is already started in ocfs2_setattr(). Fix
the problem by passing own references directly to __dquot_transfer.
Acked-by: default avatarJoel Becker <Joel.Becker@oracle.com>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent 741e1289
......@@ -933,9 +933,8 @@ int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
struct ocfs2_super *osb = OCFS2_SB(sb);
struct buffer_head *bh = NULL;
handle_t *handle = NULL;
int qtype;
struct dquot *transfer_from[MAXQUOTAS] = { };
struct dquot *transfer_to[MAXQUOTAS] = { };
int qtype;
mlog_entry("(0x%p, '%.*s')\n", dentry,
dentry->d_name.len, dentry->d_name.name);
......@@ -1019,9 +1018,7 @@ int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
transfer_to[USRQUOTA] = dqget(sb, attr->ia_uid,
USRQUOTA);
transfer_from[USRQUOTA] = dqget(sb, inode->i_uid,
USRQUOTA);
if (!transfer_to[USRQUOTA] || !transfer_from[USRQUOTA]) {
if (!transfer_to[USRQUOTA]) {
status = -ESRCH;
goto bail_unlock;
}
......@@ -1031,9 +1028,7 @@ int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
transfer_to[GRPQUOTA] = dqget(sb, attr->ia_gid,
GRPQUOTA);
transfer_from[GRPQUOTA] = dqget(sb, inode->i_gid,
GRPQUOTA);
if (!transfer_to[GRPQUOTA] || !transfer_from[GRPQUOTA]) {
if (!transfer_to[GRPQUOTA]) {
status = -ESRCH;
goto bail_unlock;
}
......@@ -1045,7 +1040,7 @@ int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
mlog_errno(status);
goto bail_unlock;
}
status = dquot_transfer(inode, attr);
status = __dquot_transfer(inode, transfer_to);
if (status < 0)
goto bail_commit;
} else {
......@@ -1085,10 +1080,8 @@ bail:
brelse(bh);
/* Release quota pointers in case we acquired them */
for (qtype = 0; qtype < MAXQUOTAS; qtype++) {
for (qtype = 0; qtype < MAXQUOTAS; qtype++)
dqput(transfer_to[qtype]);
dqput(transfer_from[qtype]);
}
if (!status && attr->ia_valid & ATTR_MODE) {
status = ocfs2_acl_chmod(inode);
......
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