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authorDaeho Jeong <daehojeong@google.com>2020-05-27 07:02:31 +0300
committerJaegeuk Kim <jaegeuk@kernel.org>2020-05-28 22:00:43 +0300
commitfd6126484ceaa9d94db196931c10454090f3d677 (patch)
treecc4ccc4f2118cca281e3a745228cd917b5169f3a /fs/f2fs/file.c
parent195f406543e555611330b98ea8c21f113a192fc3 (diff)
downloadlinux-fd6126484ceaa9d94db196931c10454090f3d677.tar.xz
f2fs: protect new segment allocation in expand_inode_data
Found a new segemnt allocation without f2fs_lock_op() in expand_inode_data(). So, when we do fallocate() for a pinned file and trigger checkpoint very frequently and simultaneously. F2FS gets stuck in the below code of do_checkpoint() forever. f2fs_sync_meta_pages(sbi, META, LONG_MAX, FS_CP_META_IO); /* Wait for all dirty meta pages to be submitted for IO */ <= if fallocate() here, f2fs_wait_on_all_pages(sbi, F2FS_DIRTY_META); <= it'll wait forever. Signed-off-by: Daeho Jeong <daehojeong@google.com> Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/file.c')
-rw-r--r--fs/f2fs/file.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 67fd1c900eb4..dfa1ac2d751a 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1658,7 +1658,11 @@ next_alloc:
down_write(&sbi->pin_sem);
map.m_seg_type = CURSEG_COLD_DATA_PINNED;
+
+ f2fs_lock_op(sbi);
f2fs_allocate_new_segments(sbi, CURSEG_COLD_DATA);
+ f2fs_unlock_op(sbi);
+
err = f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_DIO);
up_write(&sbi->pin_sem);