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[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry

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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 <[email protected]>
Acked-by: Al Viro <[email protected]>
Cc: Nathan Scott <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
David Howells 2006-06-23 02:02:58 -07:00 • committed by Linus Torvalds
commit 726c334223
60 changed files with 175 additions and 144 deletions
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3
fs/sysv/inode.c
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@ -85,8 +85,9 @@ static void sysv_put_super(struct super_block *sb)
kfree(sbi);
}
static int sysv_statfs(struct super_block *sb, struct kstatfs *buf)
static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct super_block *sb = dentry->d_sb;
struct sysv_sb_info *sbi = SYSV_SB(sb);
buf->f_type = sb->s_magic;