diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-06-10 05:30:17 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-06-10 05:30:17 -0300 |
commit | d635711daa98be86d4c7fd01499c34f566b54ccb (patch) | |
tree | aa5cc3760a27c3d57146498cb82fa549547de06c /fs/quota/dquot.c | |
parent | c91265cd0efb83778f015b4d4b1129bd2cfd075e (diff) |
Linux-libre 4.6.2-gnu
Diffstat (limited to 'fs/quota/dquot.c')
-rw-r--r-- | fs/quota/dquot.c | 64 |
1 files changed, 61 insertions, 3 deletions
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c index 850d17fa0..ff21980d0 100644 --- a/fs/quota/dquot.c +++ b/fs/quota/dquot.c @@ -411,6 +411,8 @@ int dquot_acquire(struct dquot *dquot) ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot); if (ret < 0) goto out_iolock; + /* Make sure flags update is visible after dquot has been filled */ + smp_mb__before_atomic(); set_bit(DQ_READ_B, &dquot->dq_flags); /* Instantiate dquot if needed */ if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) { @@ -427,6 +429,11 @@ int dquot_acquire(struct dquot *dquot) goto out_iolock; } } + /* + * Make sure flags update is visible after on-disk struct has been + * allocated. Paired with smp_rmb() in dqget(). + */ + smp_mb__before_atomic(); set_bit(DQ_ACTIVE_B, &dquot->dq_flags); out_iolock: mutex_unlock(&dqopt->dqio_mutex); @@ -887,6 +894,11 @@ we_slept: goto out; } } + /* + * Make sure following reads see filled structure - paired with + * smp_mb__before_atomic() in dquot_acquire(). + */ + smp_rmb(); #ifdef CONFIG_QUOTA_DEBUG BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */ #endif @@ -2030,6 +2042,30 @@ int dquot_commit_info(struct super_block *sb, int type) } EXPORT_SYMBOL(dquot_commit_info); +int dquot_get_next_id(struct super_block *sb, struct kqid *qid) +{ + struct quota_info *dqopt = sb_dqopt(sb); + int err; + + mutex_lock(&dqopt->dqonoff_mutex); + if (!sb_has_quota_active(sb, qid->type)) { + err = -ESRCH; + goto out; + } + if (!dqopt->ops[qid->type]->get_next_id) { + err = -ENOSYS; + goto out; + } + mutex_lock(&dqopt->dqio_mutex); + err = dqopt->ops[qid->type]->get_next_id(sb, qid); + mutex_unlock(&dqopt->dqio_mutex); +out: + mutex_unlock(&dqopt->dqonoff_mutex); + + return err; +} +EXPORT_SYMBOL(dquot_get_next_id); + /* * Definitions of diskquota operations. */ @@ -2041,6 +2077,7 @@ const struct dquot_operations dquot_operations = { .write_info = dquot_commit_info, .alloc_dquot = dquot_alloc, .destroy_dquot = dquot_destroy, + .get_next_id = dquot_get_next_id, }; EXPORT_SYMBOL(dquot_operations); @@ -2429,9 +2466,7 @@ int dquot_quota_on_mount(struct super_block *sb, char *qf_name, struct dentry *dentry; int error; - inode_lock(d_inode(sb->s_root)); - dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name)); - inode_unlock(d_inode(sb->s_root)); + dentry = lookup_one_len_unlocked(qf_name, sb->s_root, strlen(qf_name)); if (IS_ERR(dentry)) return PTR_ERR(dentry); @@ -2564,6 +2599,27 @@ int dquot_get_dqblk(struct super_block *sb, struct kqid qid, } EXPORT_SYMBOL(dquot_get_dqblk); +int dquot_get_next_dqblk(struct super_block *sb, struct kqid *qid, + struct qc_dqblk *di) +{ + struct dquot *dquot; + int err; + + if (!sb->dq_op->get_next_id) + return -ENOSYS; + err = sb->dq_op->get_next_id(sb, qid); + if (err < 0) + return err; + dquot = dqget(sb, *qid); + if (IS_ERR(dquot)) + return PTR_ERR(dquot); + do_get_dqblk(dquot, di); + dqput(dquot); + + return 0; +} +EXPORT_SYMBOL(dquot_get_next_dqblk); + #define VFS_QC_MASK \ (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \ QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \ @@ -2764,6 +2820,7 @@ const struct quotactl_ops dquot_quotactl_ops = { .get_state = dquot_get_state, .set_info = dquot_set_dqinfo, .get_dqblk = dquot_get_dqblk, + .get_nextdqblk = dquot_get_next_dqblk, .set_dqblk = dquot_set_dqblk }; EXPORT_SYMBOL(dquot_quotactl_ops); @@ -2775,6 +2832,7 @@ const struct quotactl_ops dquot_quotactl_sysfile_ops = { .get_state = dquot_get_state, .set_info = dquot_set_dqinfo, .get_dqblk = dquot_get_dqblk, + .get_nextdqblk = dquot_get_next_dqblk, .set_dqblk = dquot_set_dqblk }; EXPORT_SYMBOL(dquot_quotactl_sysfile_ops); |