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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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8
fs/compat.c
View file

@ -197,7 +197,7 @@ asmlinkage long compat_sys_statfs(const char __user *path, struct compat_statfs
error = user_path_walk(path, &nd);
if (!error) {
struct kstatfs tmp;
error = vfs_statfs(nd.dentry->d_inode->i_sb, &tmp);
error = vfs_statfs(nd.dentry, &tmp);
if (!error)
error = put_compat_statfs(buf, &tmp);
path_release(&nd);
@ -215,7 +215,7 @@ asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user
file = fget(fd);
if (!file)
goto out;
error = vfs_statfs(file->f_dentry->d_inode->i_sb, &tmp);
error = vfs_statfs(file->f_dentry, &tmp);
if (!error)
error = put_compat_statfs(buf, &tmp);
fput(file);
@ -265,7 +265,7 @@ asmlinkage long compat_sys_statfs64(const char __user *path, compat_size_t sz, s
error = user_path_walk(path, &nd);
if (!error) {
struct kstatfs tmp;
error = vfs_statfs(nd.dentry->d_inode->i_sb, &tmp);
error = vfs_statfs(nd.dentry, &tmp);
if (!error)
error = put_compat_statfs64(buf, &tmp);
path_release(&nd);
@ -286,7 +286,7 @@ asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct c
file = fget(fd);
if (!file)
goto out;
error = vfs_statfs(file->f_dentry->d_inode->i_sb, &tmp);
error = vfs_statfs(file->f_dentry, &tmp);
if (!error)
error = put_compat_statfs64(buf, &tmp);
fput(file);