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quota: Propagate error from ->acquire_dquot()

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Currently when some error happened in ->acquire_dquot(), dqget() just
returned NULL. That was indistinguishable from a case when e.g. someone
run quotaoff and so was generally silently ignored. However
->acquire_dquot() can fail because of ENOSPC or EIO in which case user
should better know. So propagate error up from ->acquire_dquot properly.

Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2015-06-24 18:07:02 +02:00 committed by Jan Kara
parent d725e66c06
commit 6184fc0b8d
4 changed files with 72 additions and 33 deletions
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8
fs/ocfs2/file.c
View File

@ -1209,8 +1209,8 @@ int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
&& OCFS2_HAS_RO_COMPAT_FEATURE(sb,
OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(attr->ia_uid));
if (!transfer_to[USRQUOTA]) {
status = -ESRCH;
if (IS_ERR(transfer_to[USRQUOTA])) {
status = PTR_ERR(transfer_to[USRQUOTA]);
goto bail_unlock;
}
}
@ -1218,8 +1218,8 @@ int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
&& OCFS2_HAS_RO_COMPAT_FEATURE(sb,
OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(attr->ia_gid));
if (!transfer_to[GRPQUOTA]) {
status = -ESRCH;
if (IS_ERR(transfer_to[GRPQUOTA])) {
status = PTR_ERR(transfer_to[GRPQUOTA]);
goto bail_unlock;
}
}

4
fs/ocfs2/quota_local.c
View File

@ -499,8 +499,8 @@ static int ocfs2_recover_local_quota_file(struct inode *lqinode,
dquot = dqget(sb,
make_kqid(&init_user_ns, type,
le64_to_cpu(dqblk->dqb_id)));
if (!dquot) {
status = -EIO;
if (IS_ERR(dquot)) {
status = PTR_ERR(dquot);
mlog(ML_ERROR, "Failed to get quota structure "
"for id %u, type %d. Cannot finish quota "
"file recovery.\n",

88
fs/quota/dquot.c
View File

@ -247,7 +247,7 @@ struct dqstats dqstats;
EXPORT_SYMBOL(dqstats);
static qsize_t inode_get_rsv_space(struct inode *inode);
static void __dquot_initialize(struct inode *inode, int type);
static int __dquot_initialize(struct inode *inode, int type);
static inline unsigned int
hashfn(const struct super_block *sb, struct kqid qid)
@ -832,16 +832,17 @@ static struct dquot *get_empty_dquot(struct super_block *sb, int type)
struct dquot *dqget(struct super_block *sb, struct kqid qid)
{
unsigned int hashent = hashfn(sb, qid);
struct dquot *dquot = NULL, *empty = NULL;
struct dquot *dquot, *empty = NULL;
if (!sb_has_quota_active(sb, qid.type))
return NULL;
return ERR_PTR(-ESRCH);
we_slept:
spin_lock(&dq_list_lock);
spin_lock(&dq_state_lock);
if (!sb_has_quota_active(sb, qid.type)) {
spin_unlock(&dq_state_lock);
spin_unlock(&dq_list_lock);
dquot = ERR_PTR(-ESRCH);
goto out;
}
spin_unlock(&dq_state_lock);
@ -876,11 +877,15 @@ struct dquot *dqget(struct super_block *sb, struct kqid qid)
* already finished or it will be canceled due to dq_count > 1 test */
wait_on_dquot(dquot);
/* Read the dquot / allocate space in quota file */
if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) &&
sb->dq_op->acquire_dquot(dquot) < 0) {
dqput(dquot);
dquot = NULL;
goto out;
if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
int err;
err = sb->dq_op->acquire_dquot(dquot);
if (err < 0) {
dqput(dquot);
dquot = ERR_PTR(err);
goto out;
}
}
#ifdef CONFIG_QUOTA_DEBUG
BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */
@ -1390,15 +1395,16 @@ static int dquot_active(const struct inode *inode)
* It is better to call this function outside of any transaction as it
* might need a lot of space in journal for dquot structure allocation.
*/
static void __dquot_initialize(struct inode *inode, int type)
static int __dquot_initialize(struct inode *inode, int type)
{
int cnt, init_needed = 0;
struct dquot **dquots, *got[MAXQUOTAS];
struct super_block *sb = inode->i_sb;
qsize_t rsv;
int ret = 0;
if (!dquot_active(inode))
return;
return 0;
dquots = i_dquot(inode);
@ -1407,6 +1413,7 @@ static void __dquot_initialize(struct inode *inode, int type)
struct kqid qid;
kprojid_t projid;
int rc;
struct dquot *dquot;
got[cnt] = NULL;
if (type != -1 && cnt != type)
@ -1438,16 +1445,25 @@ static void __dquot_initialize(struct inode *inode, int type)
qid = make_kqid_projid(projid);
break;
}
got[cnt] = dqget(sb, qid);
dquot = dqget(sb, qid);
if (IS_ERR(dquot)) {
/* We raced with somebody turning quotas off... */
if (PTR_ERR(dquot) != -ESRCH) {
ret = PTR_ERR(dquot);
goto out_put;
}
dquot = NULL;
}
got[cnt] = dquot;
}
/* All required i_dquot has been initialized */
if (!init_needed)
return;
return 0;
spin_lock(&dq_data_lock);
if (IS_NOQUOTA(inode))
goto out_err;
goto out_lock;
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
if (type != -1 && cnt != type)
continue;
@ -1469,15 +1485,18 @@ static void __dquot_initialize(struct inode *inode, int type)
dquot_resv_space(dquots[cnt], rsv);
}
}
out_err:
out_lock:
spin_unlock(&dq_data_lock);
out_put:
/* Drop unused references */
dqput_all(got);
return ret;
}
void dquot_initialize(struct inode *inode)
int dquot_initialize(struct inode *inode)
{
__dquot_initialize(inode, -1);
return __dquot_initialize(inode, -1);
}
EXPORT_SYMBOL(dquot_initialize);
@ -1961,18 +1980,37 @@ EXPORT_SYMBOL(__dquot_transfer);
int dquot_transfer(struct inode *inode, struct iattr *iattr)
{
struct dquot *transfer_to[MAXQUOTAS] = {};
struct dquot *dquot;
struct super_block *sb = inode->i_sb;
int ret;
if (!dquot_active(inode))
return 0;
if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid))
transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(iattr->ia_uid));
if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))
transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(iattr->ia_gid));
if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){
dquot = dqget(sb, make_kqid_uid(iattr->ia_uid));
if (IS_ERR(dquot)) {
if (PTR_ERR(dquot) != -ESRCH) {
ret = PTR_ERR(dquot);
goto out_put;
}
dquot = NULL;
}
transfer_to[USRQUOTA] = dquot;
}
if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){
dquot = dqget(sb, make_kqid_gid(iattr->ia_gid));
if (IS_ERR(dquot)) {
if (PTR_ERR(dquot) != -ESRCH) {
ret = PTR_ERR(dquot);
goto out_put;
}
dquot = NULL;
}
transfer_to[GRPQUOTA] = dquot;
}
ret = __dquot_transfer(inode, transfer_to);
out_put:
dqput_all(transfer_to);
return ret;
}
@ -2518,8 +2556,8 @@ int dquot_get_dqblk(struct super_block *sb, struct kqid qid,
struct dquot *dquot;
dquot = dqget(sb, qid);
if (!dquot)
return -ESRCH;
if (IS_ERR(dquot))
return PTR_ERR(dquot);
do_get_dqblk(dquot, di);
dqput(dquot);
@ -2631,8 +2669,8 @@ int dquot_set_dqblk(struct super_block *sb, struct kqid qid,
int rc;
dquot = dqget(sb, qid);
if (!dquot) {
rc = -ESRCH;
if (IS_ERR(dquot)) {
rc = PTR_ERR(dquot);
goto out;
}
rc = do_set_dqblk(dquot, di);

5
include/linux/quotaops.h
View File

@ -43,7 +43,7 @@ void inode_claim_rsv_space(struct inode *inode, qsize_t number);
void inode_sub_rsv_space(struct inode *inode, qsize_t number);
void inode_reclaim_rsv_space(struct inode *inode, qsize_t number);
void dquot_initialize(struct inode *inode);
int dquot_initialize(struct inode *inode);
void dquot_drop(struct inode *inode);
struct dquot *dqget(struct super_block *sb, struct kqid qid);
static inline struct dquot *dqgrab(struct dquot *dquot)
@ -200,8 +200,9 @@ static inline int sb_has_quota_active(struct super_block *sb, int type)
return 0;
}
static inline void dquot_initialize(struct inode *inode)
static inline int dquot_initialize(struct inode *inode)
{
return 0;
}
static inline void dquot_drop(struct inode *inode)