From 6184fc0b8dd76c6aedc7a26e93254993e14e52de Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Wed, 24 Jun 2015 18:07:02 +0200 Subject: quota: Propagate error from ->acquire_dquot() 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 --- fs/quota/dquot.c | 88 ++++++++++++++++++++++++++++++++++++++++---------------- 1 file changed, 63 insertions(+), 25 deletions(-) (limited to 'fs/quota') diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c index 20d1f74561cf..fed66e2c9fe8 100644 --- a/fs/quota/dquot.c +++ b/fs/quota/dquot.c @@ -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 @@ we_slept: * 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); -- cgit v1.2.3-59-g8ed1b