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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
Download patch file Download diff file Expand all files Collapse all files

26
fs/open.c
View file

@ -31,18 +31,18 @@
#include <asm/unistd.h>
int vfs_statfs(struct super_block *sb, struct kstatfs *buf)
int vfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
int retval = -ENODEV;
if (sb) {
if (dentry) {
retval = -ENOSYS;
if (sb->s_op->statfs) {
if (dentry->d_sb->s_op->statfs) {
memset(buf, 0, sizeof(*buf));
retval = security_sb_statfs(sb);
retval = security_sb_statfs(dentry);
if (retval)
return retval;
retval = sb->s_op->statfs(sb, buf);
retval = dentry->d_sb->s_op->statfs(dentry, buf);
if (retval == 0 && buf->f_frsize == 0)
buf->f_frsize = buf->f_bsize;
}
@ -52,12 +52,12 @@ int vfs_statfs(struct super_block *sb, struct kstatfs *buf)
EXPORT_SYMBOL(vfs_statfs);
static int vfs_statfs_native(struct super_block *sb, struct statfs *buf)
static int vfs_statfs_native(struct dentry *dentry, struct statfs *buf)
{
struct kstatfs st;
int retval;
retval = vfs_statfs(sb, &st);
retval = vfs_statfs(dentry, &st);
if (retval)
return retval;
@ -95,12 +95,12 @@ static int vfs_statfs_native(struct super_block *sb, struct statfs *buf)
return 0;
}
static int vfs_statfs64(struct super_block *sb, struct statfs64 *buf)
static int vfs_statfs64(struct dentry *dentry, struct statfs64 *buf)
{
struct kstatfs st;
int retval;
retval = vfs_statfs(sb, &st);
retval = vfs_statfs(dentry, &st);
if (retval)
return retval;
@ -130,7 +130,7 @@ asmlinkage long sys_statfs(const char __user * path, struct statfs __user * buf)
error = user_path_walk(path, &nd);
if (!error) {
struct statfs tmp;
error = vfs_statfs_native(nd.dentry->d_inode->i_sb, &tmp);
error = vfs_statfs_native(nd.dentry, &tmp);
if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
error = -EFAULT;
path_release(&nd);
@ -149,7 +149,7 @@ asmlinkage long sys_statfs64(const char __user *path, size_t sz, struct statfs64
error = user_path_walk(path, &nd);
if (!error) {
struct statfs64 tmp;
error = vfs_statfs64(nd.dentry->d_inode->i_sb, &tmp);
error = vfs_statfs64(nd.dentry, &tmp);
if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
error = -EFAULT;
path_release(&nd);
@ -168,7 +168,7 @@ asmlinkage long sys_fstatfs(unsigned int fd, struct statfs __user * buf)
file = fget(fd);
if (!file)
goto out;
error = vfs_statfs_native(file->f_dentry->d_inode->i_sb, &tmp);
error = vfs_statfs_native(file->f_dentry, &tmp);
if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
error = -EFAULT;
fput(file);
@ -189,7 +189,7 @@ asmlinkage long sys_fstatfs64(unsigned int fd, size_t sz, struct statfs64 __user
file = fget(fd);
if (!file)
goto out;
error = vfs_statfs64(file->f_dentry->d_inode->i_sb, &tmp);
error = vfs_statfs64(file->f_dentry, &tmp);
if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
error = -EFAULT;
fput(file);