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authorChristoph Hellwig <hch@lst.de>2010-07-07 18:53:11 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2010-08-09 16:48:42 -0400
commitebabe9a9001af0af56c0c2780ca1576246e7a74b (patch)
treeb263299f575c650b6e9d95c7c4bdeef958af2fc9 /fs/statfs.c
parent336fb3b97b78edc65bae0b223b83bf676cfe29e2 (diff)
pass a struct path to vfs_statfs
We'll need the path to implement the flags field for statvfs support. We do have it available in all callers except: - ecryptfs_statfs. This one doesn't actually need vfs_statfs but just needs to do a caller to the lower filesystem statfs method. - sys_ustat. Add a non-exported statfs_by_dentry helper for it which doesn't won't be able to fill out the flags field later on. In addition rename the helpers for statfs vs fstatfs to do_*statfs instead of the misleading vfs prefix. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/statfs.c')
-rw-r--r--fs/statfs.c50
1 files changed, 26 insertions, 24 deletions
diff --git a/fs/statfs.c b/fs/statfs.c
index 4ef021f3b61..6a305709a4d 100644
--- a/fs/statfs.c
+++ b/fs/statfs.c
@@ -7,33 +7,35 @@
#include <linux/security.h>
#include <linux/uaccess.h>
-int vfs_statfs(struct dentry *dentry, struct kstatfs *buf)
+int statfs_by_dentry(struct dentry *dentry, struct kstatfs *buf)
{
- int retval = -ENODEV;
-
- if (dentry) {
- retval = -ENOSYS;
- if (dentry->d_sb->s_op->statfs) {
- memset(buf, 0, sizeof(*buf));
- retval = security_sb_statfs(dentry);
- if (retval)
- return retval;
- retval = dentry->d_sb->s_op->statfs(dentry, buf);
- if (retval == 0 && buf->f_frsize == 0)
- buf->f_frsize = buf->f_bsize;
- }
- }
+ int retval;
+
+ if (!dentry->d_sb->s_op->statfs)
+ return -ENOSYS;
+
+ memset(buf, 0, sizeof(*buf));
+ retval = security_sb_statfs(dentry);
+ if (retval)
+ return retval;
+ retval = dentry->d_sb->s_op->statfs(dentry, buf);
+ if (retval == 0 && buf->f_frsize == 0)
+ buf->f_frsize = buf->f_bsize;
return retval;
}
+int vfs_statfs(struct path *path, struct kstatfs *buf)
+{
+ return statfs_by_dentry(path->dentry, buf);
+}
EXPORT_SYMBOL(vfs_statfs);
-static int vfs_statfs_native(struct dentry *dentry, struct statfs *buf)
+static int do_statfs_native(struct path *path, struct statfs *buf)
{
struct kstatfs st;
int retval;
- retval = vfs_statfs(dentry, &st);
+ retval = vfs_statfs(path, &st);
if (retval)
return retval;
@@ -72,12 +74,12 @@ static int vfs_statfs_native(struct dentry *dentry, struct statfs *buf)
return 0;
}
-static int vfs_statfs64(struct dentry *dentry, struct statfs64 *buf)
+static int do_statfs64(struct path *path, struct statfs64 *buf)
{
struct kstatfs st;
int retval;
- retval = vfs_statfs(dentry, &st);
+ retval = vfs_statfs(path, &st);
if (retval)
return retval;
@@ -107,7 +109,7 @@ SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct statfs __user *, b
error = user_path(pathname, &path);
if (!error) {
struct statfs tmp;
- error = vfs_statfs_native(path.dentry, &tmp);
+ error = do_statfs_native(&path, &tmp);
if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
error = -EFAULT;
path_put(&path);
@@ -125,7 +127,7 @@ SYSCALL_DEFINE3(statfs64, const char __user *, pathname, size_t, sz, struct stat
error = user_path(pathname, &path);
if (!error) {
struct statfs64 tmp;
- error = vfs_statfs64(path.dentry, &tmp);
+ error = do_statfs64(&path, &tmp);
if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
error = -EFAULT;
path_put(&path);
@@ -143,7 +145,7 @@ SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct statfs __user *, buf)
file = fget(fd);
if (!file)
goto out;
- error = vfs_statfs_native(file->f_path.dentry, &tmp);
+ error = do_statfs_native(&file->f_path, &tmp);
if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
error = -EFAULT;
fput(file);
@@ -164,7 +166,7 @@ SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user
file = fget(fd);
if (!file)
goto out;
- error = vfs_statfs64(file->f_path.dentry, &tmp);
+ error = do_statfs64(&file->f_path, &tmp);
if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
error = -EFAULT;
fput(file);
@@ -183,7 +185,7 @@ SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf)
if (!s)
return -EINVAL;
- err = vfs_statfs(s->s_root, &sbuf);
+ err = statfs_by_dentry(s->s_root, &sbuf);
drop_super(s);
if (err)
return err;