diff options
| -rw-r--r-- | fs/btrfs/file.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 13664b315fe2..ab22ca4f237f 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -69,6 +69,19 @@ static noinline int btrfs_copy_from_user(loff_t pos, int num_pages, /* Flush processor's dcache for this page */ flush_dcache_page(page); + + /* + * if we get a partial write, we can end up with + * partially up to date pages. These add + * a lot of complexity, so make sure they don't + * happen by forcing this copy to be retried. + * + * The rest of the btrfs_file_write code will fall + * back to page at a time copies after we return 0. + */ + if (!PageUptodate(page) && copied < count) + copied = 0; + iov_iter_advance(i, copied); write_bytes -= copied; total_copied += copied; |