diff options
| -rw-r--r-- | fs/btrfs/file.c | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 700ffd266da..71c2dc1ea15 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -1873,26 +1873,28 @@ static int btrfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) btrfs_wait_ordered_range(inode, offset, len); mutex_lock(&inode->i_mutex); - if (offset >= inode->i_size) { - mutex_unlock(&inode->i_mutex); - return 0; - } - + /* + * We needn't truncate any page which is beyond the end of the file + * because we are sure there is no data there. + */ /* * Only do this if we are in the same page and we aren't doing the * entire page. */ if (same_page && len < PAGE_CACHE_SIZE) { - ret = btrfs_truncate_page(inode, offset, len, 0); + if (offset < round_up(inode->i_size, PAGE_CACHE_SIZE)) + ret = btrfs_truncate_page(inode, offset, len, 0); mutex_unlock(&inode->i_mutex); return ret; } /* zero back part of the first page */ - ret = btrfs_truncate_page(inode, offset, 0, 0); - if (ret) { - mutex_unlock(&inode->i_mutex); - return ret; + if (offset < round_up(inode->i_size, PAGE_CACHE_SIZE)) { + ret = btrfs_truncate_page(inode, offset, 0, 0); + if (ret) { + mutex_unlock(&inode->i_mutex); + return ret; + } } /* zero the front end of the last page */ |