nilfs2: fix deadlock issue between chcp and thaw ioctls

An fs-thaw ioctl causes deadlock with a chcp or mkcp -s command:

 chcp            D ffff88013870f3d0     0  1325   1324 0x00000004
 ...
 Call Trace:
   nilfs_transaction_begin+0x11c/0x1a0 [nilfs2]
   wake_up_bit+0x20/0x20
   copy_from_user+0x18/0x30 [nilfs2]
   nilfs_ioctl_change_cpmode+0x7d/0xcf [nilfs2]
   nilfs_ioctl+0x252/0x61a [nilfs2]
   do_page_fault+0x311/0x34c
   get_unmapped_area+0x132/0x14e
   do_vfs_ioctl+0x44b/0x490
   __set_task_blocked+0x5a/0x61
   vm_mmap_pgoff+0x76/0x87
   __set_current_blocked+0x30/0x4a
   sys_ioctl+0x4b/0x6f
   system_call_fastpath+0x16/0x1b
 thaw            D ffff88013870d890     0  1352   1351 0x00000004
 ...
 Call Trace:
   rwsem_down_failed_common+0xdb/0x10f
   call_rwsem_down_write_failed+0x13/0x20
   down_write+0x25/0x27
   thaw_super+0x13/0x9e
   do_vfs_ioctl+0x1f5/0x490
   vm_mmap_pgoff+0x76/0x87
   sys_ioctl+0x4b/0x6f
   filp_close+0x64/0x6c
   system_call_fastpath+0x16/0x1b

where the thaw ioctl deadlocked at thaw_super() when called while chcp was
waiting at nilfs_transaction_begin() called from
nilfs_ioctl_change_cpmode().  This deadlock is 100% reproducible.

This is because nilfs_ioctl_change_cpmode() first locks sb->s_umount in
read mode and then waits for unfreezing in nilfs_transaction_begin(),
whereas thaw_super() locks sb->s_umount in write mode.  The locking of
sb->s_umount here was intended to make snapshot mounts and the downgrade
of snapshots to checkpoints exclusive.

This fixes the deadlock issue by replacing the sb->s_umount usage in
nilfs_ioctl_change_cpmode() with a dedicated mutex which protects snapshot
mounts.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Tested-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index 06658caa18bd229ab42e01b876538efaf2c48882..0b6387c67e6ca601d91fe75684fede7826c6f11f 100644 (file)
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -182,7 +182,7 @@ static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
        if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
                goto out;
 
-       down_read(&inode->i_sb->s_umount);
+       mutex_lock(&nilfs->ns_snapshot_mount_mutex);
 
        nilfs_transaction_begin(inode->i_sb, &ti, 0);
        ret = nilfs_cpfile_change_cpmode(
@@ -192,7 +192,7 @@ static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
        else
                nilfs_transaction_commit(inode->i_sb); /* never fails */
 
-       up_read(&inode->i_sb->s_umount);
+       mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
 out:
        mnt_drop_write_file(filp);
        return ret;

diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index a76d6ea51ffbf1de91eb2582f86e02ba9162c209..6522cac6057c900fccdac3138475ea4c0aa0a830 100644 (file)
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -945,6 +945,8 @@ static int nilfs_attach_snapshot(struct super_block *s, __u64 cno,
        struct nilfs_root *root;
        int ret;
 
+       mutex_lock(&nilfs->ns_snapshot_mount_mutex);
+
        down_read(&nilfs->ns_segctor_sem);
        ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno);
        up_read(&nilfs->ns_segctor_sem);
@@ -969,6 +971,7 @@ static int nilfs_attach_snapshot(struct super_block *s, __u64 cno,
        ret = nilfs_get_root_dentry(s, root, root_dentry);
        nilfs_put_root(root);
  out:
+       mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
        return ret;
 }
 

diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c
index 501b7f8b739fc2ed8079c0bc664481933d8d9d74..41e6a04a561f36ac1bd190b80dd2c10def4cf176 100644 (file)
--- a/fs/nilfs2/the_nilfs.c
+++ b/fs/nilfs2/the_nilfs.c
@@ -76,6 +76,7 @@ struct the_nilfs *alloc_nilfs(struct block_device *bdev)
        nilfs->ns_bdev = bdev;
        atomic_set(&nilfs->ns_ndirtyblks, 0);
        init_rwsem(&nilfs->ns_sem);
+       mutex_init(&nilfs->ns_snapshot_mount_mutex);
        INIT_LIST_HEAD(&nilfs->ns_dirty_files);
        INIT_LIST_HEAD(&nilfs->ns_gc_inodes);
        spin_lock_init(&nilfs->ns_inode_lock);

diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h
index ef40a510e2f342133ef2d8d6efbb2b5c459826b8..2558f320b8210b74b4dbc65c9fd72b9862ebb3c8 100644 (file)
--- a/fs/nilfs2/the_nilfs.h
+++ b/fs/nilfs2/the_nilfs.h
@@ -47,6 +47,7 @@ enum {
  * @ns_flags: flags
  * @ns_bdev: block device
  * @ns_sem: semaphore for shared states
+ * @ns_snapshot_mount_mutex: mutex to protect snapshot mounts
  * @ns_sbh: buffer heads of on-disk super blocks
  * @ns_sbp: pointers to super block data
  * @ns_sbwtime: previous write time of super block
@@ -100,6 +101,7 @@ struct the_nilfs {
 
        struct block_device    *ns_bdev;
        struct rw_semaphore     ns_sem;
+       struct mutex            ns_snapshot_mount_mutex;
 
        /*
         * used for