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authorChris Mason <clm@fb.com>2018-06-25 10:03:41 -0700
committerDavid Sterba <dsterba@suse.com>2018-06-28 11:30:50 +0200
commit717beb96d969561cff53aad2f09547db20ee6ffd (patch)
treeba39d7f889f9c954a19779139a0739b6530bb5a6 /fs
parent6f7de19ed3d4d3526ca5eca428009f97cf969c2f (diff)
Btrfs: fix regression in btrfs_page_mkwrite() from vm_fault_t conversion
The vm_fault_t conversion commit introduced a ret2 variable for tracking the integer return values from internal btrfs functions. It was sometimes returning VM_FAULT_LOCKED for pages that were actually invalid and had been removed from the radix. Something like this: ret2 = btrfs_delalloc_reserve_space() // returns zero on success lock_page(page) if (page->mapping != inode->i_mapping) goto out_unlock; ... out_unlock: if (!ret2) { ... return VM_FAULT_LOCKED; } This ends up triggering this WARNING in btrfs_destroy_inode() WARN_ON(BTRFS_I(inode)->block_rsv.size); xfstests generic/095 was able to reliably reproduce the errors. Since out_unlock: is only used for errors, this fix moves it below the if (!ret2) check we use to return VM_FAULT_LOCKED for success. Fixes: a528a2415087 (btrfs: change return type of btrfs_page_mkwrite to vm_fault_t) Signed-off-by: Chris Mason <clm@fb.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/inode.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index a6bf9e2ff68f..f21f4223d03b 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -9005,13 +9005,14 @@ again:
unlock_extent_cached(io_tree, page_start, page_end, &cached_state);
-out_unlock:
if (!ret2) {
btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE, true);
sb_end_pagefault(inode->i_sb);
extent_changeset_free(data_reserved);
return VM_FAULT_LOCKED;
}
+
+out_unlock:
unlock_page(page);
out:
btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE, (ret != 0));