afs: Fix deadlock between writeback and truncate

The afs filesystem has a lock[*] that it uses to serialise I/O operations
going to the server (vnode->io_lock), as the server will only perform one
modification operation at a time on any given file or directory.  This
prevents the the filesystem from filling up all the call slots to a server
with calls that aren't going to be executed in parallel anyway, thereby
allowing operations on other files to obtain slots.

  [*] Note that is probably redundant for directories at least since
      i_rwsem is used to serialise directory modifications and
      lookup/reading vs modification.  The server does allow parallel
      non-modification ops, however.

When a file truncation op completes, we truncate the in-memory copy of the
file to match - but we do it whilst still holding the io_lock, the idea
being to prevent races with other operations.

However, if writeback starts in a worker thread simultaneously with
truncation (whilst notify_change() is called with i_rwsem locked, writeback
pays it no heed), it may manage to set PG_writeback bits on the pages that
will get truncated before afs_setattr_success() manages to call
truncate_pagecache().  Truncate will then wait for those pages - whilst
still inside io_lock:

    # cat /proc/8837/stack
    [<0>] wait_on_page_bit_common+0x184/0x1e7
    [<0>] truncate_inode_pages_range+0x37f/0x3eb
    [<0>] truncate_pagecache+0x3c/0x53
    [<0>] afs_setattr_success+0x4d/0x6e
    [<0>] afs_wait_for_operation+0xd8/0x169
    [<0>] afs_do_sync_operation+0x16/0x1f
    [<0>] afs_setattr+0x1fb/0x25d
    [<0>] notify_change+0x2cf/0x3c4
    [<0>] do_truncate+0x7f/0xb2
    [<0>] do_sys_ftruncate+0xd1/0x104
    [<0>] do_syscall_64+0x2d/0x3a
    [<0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

The writeback operation, however, stalls indefinitely because it needs to
get the io_lock to proceed:

    # cat /proc/5940/stack
    [<0>] afs_get_io_locks+0x58/0x1ae
    [<0>] afs_begin_vnode_operation+0xc7/0xd1
    [<0>] afs_store_data+0x1b2/0x2a3
    [<0>] afs_write_back_from_locked_page+0x418/0x57c
    [<0>] afs_writepages_region+0x196/0x224
    [<0>] afs_writepages+0x74/0x156
    [<0>] do_writepages+0x2d/0x56
    [<0>] __writeback_single_inode+0x84/0x207
    [<0>] writeback_sb_inodes+0x238/0x3cf
    [<0>] __writeback_inodes_wb+0x68/0x9f
    [<0>] wb_writeback+0x145/0x26c
    [<0>] wb_do_writeback+0x16a/0x194
    [<0>] wb_workfn+0x74/0x177
    [<0>] process_one_work+0x174/0x264
    [<0>] worker_thread+0x117/0x1b9
    [<0>] kthread+0xec/0xf1
    [<0>] ret_from_fork+0x1f/0x30

and thus deadlock has occurred.

Note that whilst afs_setattr() calls filemap_write_and_wait(), the fact
that the caller is holding i_rwsem doesn't preclude more pages being
dirtied through an mmap'd region.

Fix this by:

 (1) Use the vnode validate_lock to mediate access between afs_setattr()
     and afs_writepages():

     (a) Exclusively lock validate_lock in afs_setattr() around the whole
     	 RPC operation.

     (b) If WB_SYNC_ALL isn't set on entry to afs_writepages(), trying to
     	 shared-lock validate_lock and returning immediately if we couldn't
     	 get it.

     (c) If WB_SYNC_ALL is set, wait for the lock.

     The validate_lock is also used to validate a file and to zap its cache
     if the file was altered by a third party, so it's probably a good fit
     for this.

 (2) Move the truncation outside of the io_lock in setattr, using the same
     hook as is used for local directory editing.

     This requires the old i_size to be retained in the operation record as
     we commit the revised status to the inode members inside the io_lock
     still, but we still need to know if we reduced the file size.

Fixes: d2ddc776a458 ("afs: Overhaul volume and server record caching and fileserver rotation")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 1d13d2e..0fe8844 100644 (file)
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -810,14 +810,32 @@ void afs_evict_inode(struct inode *inode)
 
 static void afs_setattr_success(struct afs_operation *op)
 {
-       struct inode *inode = &op->file[0].vnode->vfs_inode;
+       struct afs_vnode_param *vp = &op->file[0];
+       struct inode *inode = &vp->vnode->vfs_inode;
+       loff_t old_i_size = i_size_read(inode);
+
+       op->setattr.old_i_size = old_i_size;
+       afs_vnode_commit_status(op, vp);
+       /* inode->i_size has now been changed. */
+
+       if (op->setattr.attr->ia_valid & ATTR_SIZE) {
+               loff_t size = op->setattr.attr->ia_size;
+               if (size > old_i_size)
+                       pagecache_isize_extended(inode, old_i_size, size);
+       }
+}
+
+static void afs_setattr_edit_file(struct afs_operation *op)
+{
+       struct afs_vnode_param *vp = &op->file[0];
+       struct inode *inode = &vp->vnode->vfs_inode;
 
-       afs_vnode_commit_status(op, &op->file[0]);
        if (op->setattr.attr->ia_valid & ATTR_SIZE) {
-               loff_t i_size = inode->i_size, size = op->setattr.attr->ia_size;
-               if (size > i_size)
-                       pagecache_isize_extended(inode, i_size, size);
-               truncate_pagecache(inode, size);
+               loff_t size = op->setattr.attr->ia_size;
+               loff_t i_size = op->setattr.old_i_size;
+
+               if (size < i_size)
+                       truncate_pagecache(inode, size);
        }
 }
 
@@ -825,6 +843,7 @@ static const struct afs_operation_ops afs_setattr_operation = {
        .issue_afs_rpc  = afs_fs_setattr,
        .issue_yfs_rpc  = yfs_fs_setattr,
        .success        = afs_setattr_success,
+       .edit_dir       = afs_setattr_edit_file,
 };
 
 /*
@@ -863,11 +882,16 @@ int afs_setattr(struct dentry *dentry, struct iattr *attr)
        if (S_ISREG(vnode->vfs_inode.i_mode))
                filemap_write_and_wait(vnode->vfs_inode.i_mapping);
 
+       /* Prevent any new writebacks from starting whilst we do this. */
+       down_write(&vnode->validate_lock);
+
        op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ?
                                  afs_file_key(attr->ia_file) : NULL),
                                 vnode->volume);
-       if (IS_ERR(op))
-               return PTR_ERR(op);
+       if (IS_ERR(op)) {
+               ret = PTR_ERR(op);
+               goto out_unlock;
+       }
 
        afs_op_set_vnode(op, 0, vnode);
        op->setattr.attr = attr;
@@ -880,5 +904,10 @@ int afs_setattr(struct dentry *dentry, struct iattr *attr)
        op->file[0].update_ctime = 1;
 
        op->ops = &afs_setattr_operation;
-       return afs_do_sync_operation(op);
+       ret = afs_do_sync_operation(op);
+
+out_unlock:
+       up_write(&vnode->validate_lock);
+       _leave(" = %d", ret);
+       return ret;
 }

diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 18042b7..e5f0446 100644 (file)
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -812,6 +812,7 @@ struct afs_operation {
                } store;
                struct {
                        struct iattr    *attr;
+                       loff_t          old_i_size;
                } setattr;
                struct afs_acl  *acl;
                struct yfs_acl  *yacl;

diff --git a/fs/afs/write.c b/fs/afs/write.c
index 4b2265c..da12abd 100644 (file)
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -738,11 +738,21 @@ static int afs_writepages_region(struct address_space *mapping,
 int afs_writepages(struct address_space *mapping,
                   struct writeback_control *wbc)
 {
+       struct afs_vnode *vnode = AFS_FS_I(mapping->host);
        pgoff_t start, end, next;
        int ret;
 
        _enter("");
 
+       /* We have to be careful as we can end up racing with setattr()
+        * truncating the pagecache since the caller doesn't take a lock here
+        * to prevent it.
+        */
+       if (wbc->sync_mode == WB_SYNC_ALL)
+               down_read(&vnode->validate_lock);
+       else if (!down_read_trylock(&vnode->validate_lock))
+               return 0;
+
        if (wbc->range_cyclic) {
                start = mapping->writeback_index;
                end = -1;
@@ -762,6 +772,7 @@ int afs_writepages(struct address_space *mapping,
                ret = afs_writepages_region(mapping, wbc, start, end, &next);
        }
 
+       up_read(&vnode->validate_lock);
        _leave(" = %d", ret);
        return ret;
 }