[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry
Give the statfs superblock operation a dentry pointer rather than a superblock
pointer.
This complements the get_sb() patch. That reduced the significance of
sb->s_root, allowing NFS to place a fake root there. However, NFS does
require a dentry to use as a target for the statfs operation. This permits
the root in the vfsmount to be used instead.
linux/mount.h has been added where necessary to make allyesconfig build
successfully.
Interest has also been expressed for use with the FUSE and XFS filesystems.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Nathan Scott <nathans@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 788b8b5..cdf7339 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -100,7 +100,7 @@
static void ocfs2_free_mem_caches(void);
static void ocfs2_delete_osb(struct ocfs2_super *osb);
-static int ocfs2_statfs(struct super_block *sb, struct kstatfs *buf);
+static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
static int ocfs2_sync_fs(struct super_block *sb, int wait);
@@ -857,7 +857,7 @@
mlog_exit_void();
}
-static int ocfs2_statfs(struct super_block *sb, struct kstatfs *buf)
+static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct ocfs2_super *osb;
u32 numbits, freebits;
@@ -866,9 +866,9 @@
struct buffer_head *bh = NULL;
struct inode *inode = NULL;
- mlog_entry("(%p, %p)\n", sb, buf);
+ mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
- osb = OCFS2_SB(sb);
+ osb = OCFS2_SB(dentry->d_sb);
inode = ocfs2_get_system_file_inode(osb,
GLOBAL_BITMAP_SYSTEM_INODE,
@@ -891,7 +891,7 @@
freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
buf->f_type = OCFS2_SUPER_MAGIC;
- buf->f_bsize = sb->s_blocksize;
+ buf->f_bsize = dentry->d_sb->s_blocksize;
buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
buf->f_blocks = ((sector_t) numbits) *
(osb->s_clustersize >> osb->sb->s_blocksize_bits);