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devpts: hoist out check for DEVPTS_SUPER_MAGIC

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Hoist the check whether we have already found a suitable devpts filesystem
out of devpts_ptmx_path() in preparation for the devpts bind-mount
resolution patch. This is a non-functional change.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Reviewed-by: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Brauner 2018-03-13 17:55:24 +01:00 committed by Greg Kroah-Hartman
parent f597fbce38
commit 7d71109df1
1 changed files with 15 additions and 11 deletions
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26
fs/devpts/inode.c
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@ -138,10 +138,6 @@ static int devpts_ptmx_path(struct path *path)
struct super_block *sb;
int err;
/* Has the devpts filesystem already been found? */
if (path->mnt->mnt_sb->s_magic == DEVPTS_SUPER_MAGIC)
return 0;
/* Is a devpts filesystem at "pts" in the same directory? */
err = path_pts(path);
if (err)
@ -159,21 +155,25 @@ static int devpts_ptmx_path(struct path *path)
struct vfsmount *devpts_mntget(struct file *filp, struct pts_fs_info *fsi)
{
struct path path;
int err;
int err = 0;
path = filp->f_path;
path_get(&path);
err = devpts_ptmx_path(&path);
/* Has the devpts filesystem already been found? */
if (path.mnt->mnt_sb->s_magic != DEVPTS_SUPER_MAGIC)
err = devpts_ptmx_path(&path);
dput(path.dentry);
if (err) {
mntput(path.mnt);
return ERR_PTR(err);
}
if (DEVPTS_SB(path.mnt->mnt_sb) != fsi) {
mntput(path.mnt);
return ERR_PTR(-ENODEV);
}
return path.mnt;
}
@ -182,15 +182,19 @@ struct pts_fs_info *devpts_acquire(struct file *filp)
struct pts_fs_info *result;
struct path path;
struct super_block *sb;
int err;
path = filp->f_path;
path_get(&path);
err = devpts_ptmx_path(&path);
if (err) {
result = ERR_PTR(err);
goto out;
/* Has the devpts filesystem already been found? */
if (path.mnt->mnt_sb->s_magic != DEVPTS_SUPER_MAGIC) {
int err;
err = devpts_ptmx_path(&path);
if (err) {
result = ERR_PTR(err);
goto out;
}
}
/*