dquot: move dquot initialization responsibility into the filesystem

Currently various places in the VFS call vfs_dq_init directly.  This means
we tie the quota code into the VFS.  Get rid of that and make the
filesystem responsible for the initialization.   For most metadata operations
this is a straight forward move into the methods, but for truncate and
open it's a bit more complicated.

For truncate we currently only call vfs_dq_init for the sys_truncate case
because open already takes care of it for ftruncate and open(O_TRUNC) - the
new code causes an additional vfs_dq_init for those which is harmless.

For open the initialization is moved from do_filp_open into the open method,
which means it happens slightly earlier now, and only for regular files.
The latter is fine because we don't need to initialize it for operations
on special files, and we already do it as part of the namespace operations
for directories.

Add a dquot_file_open helper that filesystems that support generic quotas
can use to fill in ->open.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/quotaops.h b/include/linux/quotaops.h
index a5ebd1abccd8..93ac788345e2 100644
--- a/include/linux/quotaops.h
+++ b/include/linux/quotaops.h
@@ -48,6 +48,8 @@ int dquot_release(struct dquot *dquot);
 int dquot_commit_info(struct super_block *sb, int type);
 int dquot_mark_dquot_dirty(struct dquot *dquot);
 
+int dquot_file_open(struct inode *inode, struct file *file);
+
 int vfs_quota_on(struct super_block *sb, int type, int format_id,
         char *path, int remount);
 int vfs_quota_enable(struct inode *inode, int type, int format_id,
@@ -342,4 +344,6 @@ static inline void dquot_release_reservation_block(struct inode *inode,
         __dquot_free_space(inode, nr << inode->i_blkbits, 1);
 }
 
+#define dquot_file_open         generic_file_open
+
 #endif /* _LINUX_QUOTAOPS_ */