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);
The fix used here is to use ret instead of ret2 in our check for success.
Fixes: a528a2415087 (btrfs: change return type of btrfs_page_mkwrite to
vm_fault_t)
Signed-off-by: Chris Mason <c...@fb.com>
---
fs/btrfs/inode.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 193f933..38403aa 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -9013,6 +9013,7 @@ vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf)
goto out_unlock;
}
ret2 = 0;
+ ret = 0;
/* page is wholly or partially inside EOF */
if (page_start + PAGE_SIZE > size)
@@ -9037,7 +9038,7 @@ vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf)
unlock_extent_cached(io_tree, page_start, page_end, &cached_state);
out_unlock:
- if (!ret2) {
+ if (!ret) {
btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE, true);
sb_end_pagefault(inode->i_sb);
extent_changeset_free(data_reserved);
--
2.9.5
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