From: Jan Kara <jack@xxxxxxx>
[ Upstream commit c7d3d28360fdb3ed3a5aa0bab19315e0fdc994a1 ]
Factor out setting up of quota inode and eventual error cleanup from
vfs_load_quota_inode(). This will simplify situation for filesystems
that don't have any quota inodes.
Signed-off-by: Jan Kara <jack@xxxxxxx>
Stable-dep-of: d32387748476 ("ext4: fix bug_on in __es_tree_search caused by bad quota inode")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/quota/dquot.c | 108 ++++++++++++++++++++++++---------------
include/linux/quotaops.h | 2 +
2 files changed, 69 insertions(+), 41 deletions(-)
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index dc5f8654b277..84f61ab05890 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -2306,28 +2306,60 @@ EXPORT_SYMBOL(dquot_quota_off);
* Turn quotas on on a device
*/
-/*
- * Helper function to turn quotas on when we already have the inode of
- * quota file and no quota information is loaded.
- */
-static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
+static int vfs_setup_quota_inode(struct inode *inode, int type)
+{
+ struct super_block *sb = inode->i_sb;
+ struct quota_info *dqopt = sb_dqopt(sb);
+
+ if (!S_ISREG(inode->i_mode))
+ return -EACCES;
+ if (IS_RDONLY(inode))
+ return -EROFS;
+ if (sb_has_quota_loaded(sb, type))
+ return -EBUSY;
+
+ dqopt->files[type] = igrab(inode);
+ if (!dqopt->files[type])
+ return -EIO;
+ if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
+ /* We don't want quota and atime on quota files (deadlocks
+ * possible) Also nobody should write to the file - we use
+ * special IO operations which ignore the immutable bit. */
+ inode_lock(inode);
+ inode->i_flags |= S_NOQUOTA;
+ inode_unlock(inode);
+ /*
+ * When S_NOQUOTA is set, remove dquot references as no more
+ * references can be added
+ */
+ __dquot_drop(inode);
+ }
+ return 0;
+}
+
+static void vfs_cleanup_quota_inode(struct super_block *sb, int type)
+{
+ struct quota_info *dqopt = sb_dqopt(sb);
+ struct inode *inode = dqopt->files[type];
+
+ if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
+ inode_lock(inode);
+ inode->i_flags &= ~S_NOQUOTA;
+ inode_unlock(inode);
+ }
+ dqopt->files[type] = NULL;
+ iput(inode);
+}
+
+int dquot_load_quota_sb(struct super_block *sb, int type, int format_id,
unsigned int flags)
{
struct quota_format_type *fmt = find_quota_format(format_id);
- struct super_block *sb = inode->i_sb;
struct quota_info *dqopt = sb_dqopt(sb);
int error;
if (!fmt)
return -ESRCH;
- if (!S_ISREG(inode->i_mode)) {
- error = -EACCES;
- goto out_fmt;
- }
- if (IS_RDONLY(inode)) {
- error = -EROFS;
- goto out_fmt;
- }
if (!sb->s_op->quota_write || !sb->s_op->quota_read ||
(type == PRJQUOTA && sb->dq_op->get_projid == NULL)) {
error = -EINVAL;
@@ -2359,27 +2391,9 @@ static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
invalidate_bdev(sb->s_bdev);
}
- if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
- /* We don't want quota and atime on quota files (deadlocks
- * possible) Also nobody should write to the file - we use
- * special IO operations which ignore the immutable bit. */
- inode_lock(inode);
- inode->i_flags |= S_NOQUOTA;
- inode_unlock(inode);
- /*
- * When S_NOQUOTA is set, remove dquot references as no more
- * references can be added
- */
- __dquot_drop(inode);
- }
-
- error = -EIO;
- dqopt->files[type] = igrab(inode);
- if (!dqopt->files[type])
- goto out_file_flags;
error = -EINVAL;
if (!fmt->qf_ops->check_quota_file(sb, type))
- goto out_file_init;
+ goto out_fmt;
dqopt->ops[type] = fmt->qf_ops;
dqopt->info[type].dqi_format = fmt;
@@ -2387,7 +2401,7 @@ static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
error = dqopt->ops[type]->read_file_info(sb, type);
if (error < 0)
- goto out_file_init;
+ goto out_fmt;
if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) {
spin_lock(&dq_data_lock);
dqopt->info[type].dqi_flags |= DQF_SYS_FILE;
@@ -2402,18 +2416,30 @@ static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
dquot_disable(sb, type, flags);
return error;
-out_file_init:
- dqopt->files[type] = NULL;
- iput(inode);
-out_file_flags:
- inode_lock(inode);
- inode->i_flags &= ~S_NOQUOTA;
- inode_unlock(inode);
out_fmt:
put_quota_format(fmt);
return error;
}
+EXPORT_SYMBOL(dquot_load_quota_sb);
+
+/*
+ * Helper function to turn quotas on when we already have the inode of
+ * quota file and no quota information is loaded.
+ */
+static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
+ unsigned int flags)
+{
+ int err;
+
+ err = vfs_setup_quota_inode(inode, type);
+ if (err < 0)
+ return err;
+ err = dquot_load_quota_sb(inode->i_sb, type, format_id, flags);
+ if (err < 0)
+ vfs_cleanup_quota_inode(inode->i_sb, type);
+ return err;
+}
/* Reenable quotas on remount RW */
int dquot_resume(struct super_block *sb, int type)
diff --git a/include/linux/quotaops.h b/include/linux/quotaops.h
index 91e0b7624053..ec10897f7f60 100644
--- a/include/linux/quotaops.h
+++ b/include/linux/quotaops.h
@@ -99,6 +99,8 @@ int dquot_file_open(struct inode *inode, struct file *file);
int dquot_enable(struct inode *inode, int type, int format_id,
unsigned int flags);
+int dquot_load_quota_sb(struct super_block *sb, int type, int format_id,
+ unsigned int flags);
int dquot_quota_on(struct super_block *sb, int type, int format_id,
const struct path *path);
int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
--
2.35.1
