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| author | Christian Brauner <christian.brauner@ubuntu.com> | 2018-03-13 17:55:24 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-17 11:39:26 +0200 |
| commit | cd360be6488cf3e455ca6be57fff6f6fcc787b15 (patch) | |
| tree | d63e9f528d7db0697279711264e042c1832edd20 /fs/devpts | |
| parent | 7499390b8ba5e4c9d378d301f7fd7db9be28f922 (diff) | |
| download | linux-stable-cd360be6488cf3e455ca6be57fff6f6fcc787b15.tar.gz linux-stable-cd360be6488cf3e455ca6be57fff6f6fcc787b15.tar.bz2 linux-stable-cd360be6488cf3e455ca6be57fff6f6fcc787b15.zip | |
devpts: hoist out check for DEVPTS_SUPER_MAGIC
commit 7d71109df186d630a41280670c8d71d0cf9b0da9 upstream.
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>
Diffstat (limited to 'fs/devpts')
| -rw-r--r-- | fs/devpts/inode.c | 26 |
1 files changed, 15 insertions, 11 deletions
diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c index e31d6ed3ec32..71b901936113 100644 --- a/fs/devpts/inode.c +++ b/fs/devpts/inode.c @@ -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; + } } /* |