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| author | Al Viro <viro@zeniv.linux.org.uk> | 2012-01-02 22:28:36 -0500 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-01-03 22:53:07 -0500 |
| commit | cf31e70d6cf93f19fe9bf1144966ef40991ac723 (patch) | |
| tree | 39cdc07b9d46b17ef882ddeb5041f4faec808662 /fs | |
| parent | c972b4bc8331b432f51a5f1bc3ca7e020172717f (diff) | |
| download | linux-0-day-cf31e70d6cf93f19fe9bf1144966ef40991ac723.tar.gz linux-0-day-cf31e70d6cf93f19fe9bf1144966ef40991ac723.tar.xz | |
vfs: new helper - vfs_ustat()
... and bury user_get_super()/statfs_by_dentry() - they are
purely internal now.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/compat.c | 9 | ||||
| -rw-r--r-- | fs/internal.h | 1 | ||||
| -rw-r--r-- | fs/statfs.c | 21 |
3 files changed, 15 insertions, 16 deletions
diff --git a/fs/compat.c b/fs/compat.c index c98787536bb88..9db5a60766101 100644 --- a/fs/compat.c +++ b/fs/compat.c @@ -342,16 +342,9 @@ asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct c */ asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u) { - struct super_block *sb; struct compat_ustat tmp; struct kstatfs sbuf; - int err; - - sb = user_get_super(new_decode_dev(dev)); - if (!sb) - return -EINVAL; - err = statfs_by_dentry(sb->s_root, &sbuf); - drop_super(sb); + int err = vfs_ustat(new_decode_dev(dev), &sbuf); if (err) return err; diff --git a/fs/internal.h b/fs/internal.h index 839d3f9e91739..7b1cb1528ac25 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -78,6 +78,7 @@ extern int do_remount_sb(struct super_block *, int, void *, int); extern bool grab_super_passive(struct super_block *sb); extern struct dentry *mount_fs(struct file_system_type *, int, const char *, void *); +extern struct super_block *user_get_super(dev_t); /* * open.c diff --git a/fs/statfs.c b/fs/statfs.c index 9cf04a1189659..2aa6a22e0be23 100644 --- a/fs/statfs.c +++ b/fs/statfs.c @@ -7,6 +7,7 @@ #include <linux/statfs.h> #include <linux/security.h> #include <linux/uaccess.h> +#include "internal.h" static int flags_by_mnt(int mnt_flags) { @@ -45,7 +46,7 @@ static int calculate_f_flags(struct vfsmount *mnt) flags_by_sb(mnt->mnt_sb->s_flags); } -int statfs_by_dentry(struct dentry *dentry, struct kstatfs *buf) +static int statfs_by_dentry(struct dentry *dentry, struct kstatfs *buf) { int retval; @@ -205,19 +206,23 @@ SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user return error; } -SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf) +int vfs_ustat(dev_t dev, struct kstatfs *sbuf) { - struct super_block *s; - struct ustat tmp; - struct kstatfs sbuf; + struct super_block *s = user_get_super(dev); int err; - - s = user_get_super(new_decode_dev(dev)); if (!s) return -EINVAL; - err = statfs_by_dentry(s->s_root, &sbuf); + err = statfs_by_dentry(s->s_root, sbuf); drop_super(s); + return err; +} + +SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf) +{ + struct ustat tmp; + struct kstatfs sbuf; + int err = vfs_ustat(new_decode_dev(dev), &sbuf); if (err) return err; |