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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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10
fs/minix/inode.c
View file

@ -19,7 +19,7 @@
static void minix_read_inode(struct inode * inode);
static int minix_write_inode(struct inode * inode, int wait);
static int minix_statfs(struct super_block *sb, struct kstatfs *buf);
static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
static int minix_remount (struct super_block * sb, int * flags, char * data);
static void minix_delete_inode(struct inode *inode)
@ -296,11 +296,11 @@ out_bad_sb:
return -EINVAL;
}
static int minix_statfs(struct super_block *sb, struct kstatfs *buf)
static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct minix_sb_info *sbi = minix_sb(sb);
buf->f_type = sb->s_magic;
buf->f_bsize = sb->s_blocksize;
struct minix_sb_info *sbi = minix_sb(dentry->d_sb);
buf->f_type = dentry->d_sb->s_magic;
buf->f_bsize = dentry->d_sb->s_blocksize;
buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
buf->f_bfree = minix_count_free_blocks(sbi);
buf->f_bavail = buf->f_bfree;