This patch fixes the fallocate bug like below. (See xfstests/255)
In fallocate(fd, 0, 20480),
expand_inode_data processes
for (index = pg_start; index <= pg_end; index++) {
f2fs_reserve_block();
...
}
So, even though fallocate requests 20480, 5 blocks, f2fs allocates 6 blocks
including pg_end.
So, this patch adds one condition to avoid block allocation.
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
fs/f2fs/file.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 623df73..d621ddb 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -664,11 +664,14 @@ static int expand_inode_data(struct inode *inode, loff_t offset,
for (index = pg_start; index <= pg_end; index++) {
struct dnode_of_data dn;
+ if (index == pg_end && !off_end)
+ goto noalloc;
+
set_new_dnode(&dn, inode, NULL, NULL, 0);
ret = f2fs_reserve_block(&dn, index);
if (ret)
break;
-
+noalloc:
if (pg_start == pg_end)
new_size = offset + len;
else if (index == pg_start && off_start)
--
1.8.5.2 (Apple Git-48)
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