In a previous commit, a bug was introduced where compact SSA summaries
failed to utilize the entire block space in non-4KB block size
configurations, leading to inefficient space management.

This patch fixes the calculation logic to ensure that compact SSA
summaries can fully occupy the block regardless of the block size.

Reported-by: Chris Mason <clm@meta.com>
Fixes: e48e16f3e37f ("f2fs: support non-4KB block size without packed_ssa feature")
Signed-off-by: Daeho Jeong <daehojeong@google.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Currently, F2FS requires the packed_ssa feature to be enabled when
utilizing non-4KB block sizes (e.g., 16KB). This restriction limits
the flexibility of filesystem formatting options.

This patch allows F2FS to support non-4KB block sizes even when the
packed_ssa feature is disabled. It adjusts the SSA calculation logic to
correctly handle summary entries in larger blocks without the packed
layout.

Cc: stable@kernel.org
Fixes: 7ee8bc3942f2 ("f2fs: revert summary entry count from 2048 to 512 in 16kb block support")
Signed-off-by: Daeho Jeong <daehojeong@google.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

__blkdev_issue_discard() in __submit_discard_cmd() will never fail, so
let's make FAULT_DISCARD fault injection obsolete.

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

This patch adds a new sysfs node in /sys/fs/f2fs/<disk>/inject_lock_timeout,
it relies on CONFIG_F2FS_FAULT_INJECTION kernel config.

It can be used to simulate different type of timeout in lock duration.

==========     ===============================
Flag_Value     Flag_Description
==========     ===============================
0x00000000     No timeout (default)
0x00000001     Simulate running time
0x00000002     Simulate IO type sleep time
0x00000003     Simulate Non-IO type sleep time
0x00000004     Simulate runnable time
==========     ===============================

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

No logic changes.

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Use f2fs_{down,up}_write_trace for gc_lock to trace lock elapsed time.

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Use f2fs_{down,up}_read_trace for cp_rwsem to trace lock elapsed time.

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

f2fs_folio_wait_writeback ensures the folio write is submitted to the
block layer via __submit_merged_write_cond, then waits for the folio to
complete. Other I/O submissions are irrelevant to
f2fs_folio_wait_writeback. Thus, if the folio write bio is already
submitted, the function can return immediately. This patch adds a
writeback parameter to __submit_merged_write_cond(), which signals an
immediate return after submitting the target folio, and waitting
writeback can use this parameter.

Signed-off-by: Yongpeng Yang <yangyongpeng@xiaomi.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

__blkdev_issue_discard() always returns 0, making the error assignment
in __submit_discard_cmd() dead code.

Initialize err to 0 and remove the error assignment from the
__blkdev_issue_discard() call to err. Move fault injection code into
already present if branch where err is set to -EIO.

This preserves the fault injection behavior while removing dead error
handling.

Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Chaitanya Kulkarni <ckulkarnilinux@gmail.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

This patch changes default schedule timeout value from 20ms to 1ms,
in order to give caller more chances to check whether IO or non-IO
congestion condition has already been mitigable.

In addition, default interval of periodical discard submission is
kept to 20ms.

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>