[PATCH v2 0/4] f2fs: fix panic issue in small capacity device

[Zhiguo Niu]

A panic issue happened in a reboot test in small capacity device
as following:
1.The device size is 64MB, and main area has 24 segments, and
CONFIG_F2FS_CHECK_FS is not enabled.
2.There is no any free segments left shown in free_segmap_info,
then another write request cause get_new_segment get a out-of-bound
segment with segno 24.
3.panic happen in update_sit_entry because access invalid bitmap
pointer.

More detail shown in following patch sets.
The three patches are splited here because the modifications are
relatively independent and more readable.

---
Changes of v2: stop checkpoint when get a out-of-bound segment
---

Zhiguo Niu (4):
  f2fs: correct counting methods of free_segments in __set_inuse
  f2fs: fix panic issue in update_sit_entry
  f2fs: enhance judgment conditions of GET_SEGNO
  f2fs: stop checkpoint when get a out-of-bounds segment

 fs/f2fs/file.c          |  7 ++++++-
 fs/f2fs/segment.c       | 21 ++++++++++++++++-----
 fs/f2fs/segment.h       |  7 ++++---
 include/linux/f2fs_fs.h |  1 +
 4 files changed, 27 insertions(+), 9 deletions(-)

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1.9.1