9p: Convert to separately allocated bdi
Allocate struct backing_dev_info separately instead of embedding it
inside session. This unifies handling of bdi among users.
CC: Eric Van Hensbergen <ericvh@gmail.com>
CC: Ron Minnich <rminnich@sandia.gov>
CC: Latchesar Ionkov <lucho@ionkov.net>
CC: v9fs-developer@lists.sourceforge.net
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index de3ed86..a0965fb 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -72,10 +72,12 @@ static int v9fs_set_super(struct super_block *s, void *data)
*
*/
-static void
+static int
v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
int flags, void *data)
{
+ int ret;
+
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
sb->s_blocksize = 1 << sb->s_blocksize_bits;
@@ -85,7 +87,11 @@ v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
sb->s_xattr = v9fs_xattr_handlers;
} else
sb->s_op = &v9fs_super_ops;
- sb->s_bdi = &v9ses->bdi;
+
+ ret = super_setup_bdi(sb);
+ if (ret)
+ return ret;
+
if (v9ses->cache)
sb->s_bdi->ra_pages = (VM_MAX_READAHEAD * 1024)/PAGE_SIZE;
@@ -99,6 +105,7 @@ v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
#endif
save_mount_options(sb, data);
+ return 0;
}
/**
@@ -138,7 +145,9 @@ static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags,
retval = PTR_ERR(sb);
goto clunk_fid;
}
- v9fs_fill_super(sb, v9ses, flags, data);
+ retval = v9fs_fill_super(sb, v9ses, flags, data);
+ if (retval)
+ goto release_sb;
if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
sb->s_d_op = &v9fs_cached_dentry_operations;