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authorAl Viro <viro@zeniv.linux.org.uk>2014-08-07 09:12:31 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2014-08-07 14:40:09 -0400
commit3064c3563ba4c23e2c7a47254ec056ed9ba0098a (patch)
tree806bc1df85e925686cc1075b659a6d6fe3e14aec /include/linux/mount.h
parent8fa1f1c2bd86007beb4a4845e6087ac4a704dc80 (diff)
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op-kernel-dev-3064c3563ba4c23e2c7a47254ec056ed9ba0098a.tar.gz
death to mnt_pinned
Rather than playing silly buggers with vfsmount refcounts, just have acct_on() ask fs/namespace.c for internal clone of file->f_path.mnt and replace it with said clone. Then attach the pin to original vfsmount. Voila - the clone will be alive until the file gets closed, making sure that underlying superblock remains active, etc., and we can drop the original vfsmount, so that it's not kept busy. If the file lives until the final mntput of the original vfsmount, we'll notice that there's an fs_pin (one in bsd_acct_struct that holds that file) and mnt_pin_kill() will take it out. Since ->kill() is synchronous, we won't proceed past that point until these files are closed (and private clones of our vfsmount are gone), so we get the same ordering warranties we used to get. mnt_pin()/mnt_unpin()/->mnt_pinned is gone now, and good riddance - it never became usable outside of kernel/acct.c (and racy wrt umount even there). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/mount.h')
-rw-r--r--include/linux/mount.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/mount.h b/include/linux/mount.h
index 839bac2..864b120 100644
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -62,6 +62,7 @@ struct vfsmount {
};
struct file; /* forward dec */
+struct path;
extern int mnt_want_write(struct vfsmount *mnt);
extern int mnt_want_write_file(struct file *file);
@@ -70,8 +71,7 @@ extern void mnt_drop_write(struct vfsmount *mnt);
extern void mnt_drop_write_file(struct file *file);
extern void mntput(struct vfsmount *mnt);
extern struct vfsmount *mntget(struct vfsmount *mnt);
-extern void mnt_pin(struct vfsmount *mnt);
-extern void mnt_unpin(struct vfsmount *mnt);
+extern struct vfsmount *mnt_clone_internal(struct path *path);
extern int __mnt_is_readonly(struct vfsmount *mnt);
struct file_system_type;
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