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authorJosef Bacik <josef@redhat.com>2011-08-18 10:36:39 -0400
committerChris Mason <chris.mason@oracle.com>2011-08-18 10:36:39 -0400
commitf1e490a7ebe41e06324abbbcd86005b0af02a375 (patch)
treec8ffa501d66399656377b7b4c633aaadd1604467 /fs
parentf81c9cdc567cd3160ff9e64868d9a1a7ee226480 (diff)
Btrfs: set i_size properly when fallocating and we already
xfstests exposed a problem with preallocate when it fallocates a range that already has an extent. We don't set the new i_size properly because we see that we already have an extent. This isn't right and we should update i_size if the space already exists. With this patch we now pass xfstests 075. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/file.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 0705d15542c..15e5a1cd876 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1631,11 +1631,15 @@ static long btrfs_fallocate(struct file *file, int mode,
cur_offset = alloc_start;
while (1) {
+ u64 actual_end;
+
em = btrfs_get_extent(inode, NULL, 0, cur_offset,
alloc_end - cur_offset, 0);
BUG_ON(IS_ERR_OR_NULL(em));
last_byte = min(extent_map_end(em), alloc_end);
+ actual_end = min_t(u64, extent_map_end(em), offset + len);
last_byte = (last_byte + mask) & ~mask;
+
if (em->block_start == EXTENT_MAP_HOLE ||
(cur_offset >= inode->i_size &&
!test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) {
@@ -1648,6 +1652,16 @@ static long btrfs_fallocate(struct file *file, int mode,
free_extent_map(em);
break;
}
+ } else if (actual_end > inode->i_size &&
+ !(mode & FALLOC_FL_KEEP_SIZE)) {
+ /*
+ * We didn't need to allocate any more space, but we
+ * still extended the size of the file so we need to
+ * update i_size.
+ */
+ inode->i_ctime = CURRENT_TIME;
+ i_size_write(inode, actual_end);
+ btrfs_ordered_update_i_size(inode, actual_end, NULL);
}
free_extent_map(em);