The patch titled vfs: keep list of mounts for each superblock has been added to the -mm tree. Its filename is vfs-keep-list-of-mounts-for-each-superblock.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: vfs: keep list of mounts for each superblock From: Miklos Szeredi <mszeredi@xxxxxxx> Keep track of vfsmounts belonging to a superblock. List is protected by vfsmount_lock. Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx> Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Cc: Christoph Hellwig <hch@xxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/namespace.c | 5 +++++ fs/super.c | 7 +++++++ include/linux/fs.h | 1 + include/linux/mount.h | 1 + 4 files changed, 14 insertions(+) diff -puN fs/namespace.c~vfs-keep-list-of-mounts-for-each-superblock fs/namespace.c --- a/fs/namespace.c~vfs-keep-list-of-mounts-for-each-superblock +++ a/fs/namespace.c @@ -638,6 +638,10 @@ static struct vfsmount *clone_mnt(struct if (!list_empty(&old->mnt_expire)) list_add(&mnt->mnt_expire, &old->mnt_expire); } + + br_write_lock(vfsmount_lock); + list_add_tail(&mnt->mnt_instance, &mnt->mnt_sb->s_mounts); + br_write_unlock(vfsmount_lock); } return mnt; @@ -677,6 +681,7 @@ repeat: return; } if (likely(!mnt->mnt_pinned)) { + list_del(&mnt->mnt_instance); br_write_unlock(vfsmount_lock); __mntput(mnt); return; diff -puN fs/super.c~vfs-keep-list-of-mounts-for-each-superblock fs/super.c --- a/fs/super.c~vfs-keep-list-of-mounts-for-each-superblock +++ a/fs/super.c @@ -75,6 +75,7 @@ static struct super_block *alloc_super(s INIT_HLIST_HEAD(&s->s_anon); INIT_LIST_HEAD(&s->s_inodes); INIT_LIST_HEAD(&s->s_dentry_lru); + INIT_LIST_HEAD(&s->s_mounts); init_rwsem(&s->s_umount); mutex_init(&s->s_lock); lockdep_set_class(&s->s_umount, &type->s_umount_key); @@ -130,6 +131,7 @@ static inline void destroy_super(struct free_percpu(s->s_files); #endif security_sb_free(s); + WARN_ON(!list_empty(&s->s_mounts)); kfree(s->s_subtype); kfree(s->s_options); kfree(s); @@ -972,6 +974,11 @@ vfs_kern_mount(struct file_system_type * mnt->mnt_parent = mnt; up_write(&mnt->mnt_sb->s_umount); free_secdata(secdata); + + br_write_lock(vfsmount_lock); + list_add_tail(&mnt->mnt_instance, &mnt->mnt_sb->s_mounts); + br_write_unlock(vfsmount_lock); + return mnt; out_sb: dput(mnt->mnt_root); diff -puN include/linux/fs.h~vfs-keep-list-of-mounts-for-each-superblock include/linux/fs.h --- a/include/linux/fs.h~vfs-keep-list-of-mounts-for-each-superblock +++ a/include/linux/fs.h @@ -1351,6 +1351,7 @@ struct super_block { #else struct list_head s_files; #endif + struct list_head s_mounts; /* list of mounts */ /* s_dentry_lru and s_nr_dentry_unused are protected by dcache_lock */ struct list_head s_dentry_lru; /* unused dentry lru */ int s_nr_dentry_unused; /* # of dentry on lru */ diff -puN include/linux/mount.h~vfs-keep-list-of-mounts-for-each-superblock include/linux/mount.h --- a/include/linux/mount.h~vfs-keep-list-of-mounts-for-each-superblock +++ a/include/linux/mount.h @@ -54,6 +54,7 @@ struct vfsmount { struct super_block *mnt_sb; /* pointer to superblock */ struct list_head mnt_mounts; /* list of children, anchored here */ struct list_head mnt_child; /* and going through their mnt_child */ + struct list_head mnt_instance; /* mount instance on sb->s_mounts */ int mnt_flags; /* 4 bytes hole on 64bits arches without fsnotify */ #ifdef CONFIG_FSNOTIFY _ Patches currently in -mm which might be from mszeredi@xxxxxxx are linux-next.patch vfs-fix-infinite-loop-caused-by-clone_mnt-race.patch vfs-ignore-error-on-forced-remount.patch vfs-fix-per-mount-read-write.patch vfs-add-sb_force_remount_readonly-helper.patch vfs-allow-mnt_want_write-to-sleep.patch vfs-allow-mnt_want_write-to-sleep-fix.patch vfs-keep-list-of-mounts-for-each-superblock.patch vfs-protect-remounting-superblock-read-only.patch vfs-fs_may_remount_ro-turn-unnecessary-check-into-a-warn_on.patch vfs-mark-mounts-read-only-on-forced-remount.patch fuse-use-clear_highpage-and-km_user0-instead-of-km_user1.patch fuse-use-release_pages.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html