If a segment in a section is clean or prefreed, we don't need to get its summary
and do gc.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

In f2fs, we don't need to keep block plugging for NODE and DATA writes, since
we already merged bios as much as possible.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

There is a data race between allocate_data_block() and f2fs_sbumit_page_mbio(),
which incur unnecessary reversed bio submission.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

If EIO occurred, we need to set all the mapping to avoid any further IOs.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

This is to avoid cache entry management overhead including radix tree.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

This should be 1%, 10MB / 1GB.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

FI_DIRTY_INODE flag is not covered by inode page lock, so it can be unset
at any time like below.

Thread #1                        Thread #2
- lock_page(ipage)
- update i_fields
                                 - update i_size/i_blocks/and so on
				 - set FI_DIRTY_INODE
- reset FI_DIRTY_INODE
- set_page_dirty(ipage)

In this case, we can lose the latest i_field information.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

We don't need lock parameter, which is always true.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

The number should be covered by spin_lock. Otherwise we can see wrong count
in f2fs_stat.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

Remove deprecated paramter.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

Previously, f2fs_write_data_pages() calls __f2fs_writepage() which calls
f2fs_write_data_page().
If f2fs_write_data_page() returns AOP_WRITEPAGE_ACTIVATE, __f2fs_writepage()
calls mapping_set_error(). But, this should not happen at every time, since
sometimes f2fs_write_data_page() tries to skip writing pages without error.
For example, volatile_write() gives EIO all the time, as Shuoran Liu pointed
out.
Reported-by: NShuoran Liu <liushuoran@huawei.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

Now we can report an error to f2fs_lookup given by f2fs_find_entry.
Suggested-by: NHe YunLei <heyunlei@huawei.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

Commit aaf96075 ("f2fs: check node page
contents all the time") pointed out that "sometimes it was reported that
its contents was missing", so it checks the page's mapping and contents.
When "nid != nid_of_node(page)", ERR_PTR(-EIO) will be returned to the
caller. However, commit e1c51b9f ("f2fs:
clean up node page updating flow") moves "nid != nid_of_node(page)" test
to "f2fs_bug_on(sbi, nid != nid_of_node(page))", this will return a
wrong page to the caller when F2FS_CHECK_FS is off when "sometimes it
was reported that its contents was missing" happens.

This patch restores to check node page contents all the time, and
returns the errno to make the caller known something is wrong and avoid
to use the page. This patch also moves f2fs_bug_on to its proper location.
Signed-off-by: NYunlong Song <yunlong.song@huawei.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

If there is no cold page, we don't need to do a loop to flush dirty
data pages.

On /dev/pmem0,

1. dd if=/dev/zero of=/mnt/test/testfile bs=1M count=2048 conv=fsync
 Before : 1.1 GB/s
 After  : 1.2 GB/s

2. dd if=/dev/zero of=/mnt/test/testfile bs=1M count=2048
 Before : 2.2 GB/s
 After  : 2.3 GB/s
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

For data pages, let's try to flush as much as possible in background.

On /dev/pmem0,

1. dd if=/dev/zero of=/mnt/test/testfile bs=1M count=2048 conv=fsync
 Before : 800 MB/s
 After  : 1.1 GB/s

2. dd if=/dev/zero of=/mnt/test/testfile bs=1M count=2048
 Before : 1.3 GB/s
 After  : 2.2 GB/s
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

If we get ENOMEM or EIO in f2fs_find_entry, we should stop right away.
Otherwise, for example, we can get duplicate directory entry by ->chash and
->clevel.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

This patch removes writepages lock.
We can improve multi-threading performance.

tiobench, 32 threads, 4KB write per fsync on SSD
Before: 25.88 MB/s
After: 28.03 MB/s
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

This patch sets flush_merge by default.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

If flush commands do not incur any congestion, we don't need to throw that to
dispatching queue which causes unnecessary latency.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

This patch adds lazytime support.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

If roll-forward recovery can recover i_size, we don't need to update inode's
metadata during fsync.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

This patch reduces to call them across the whole tree.
- sync_inode_page()
- update_inode_page()
- update_inode()
- f2fs_write_inode()

Instead, checkpoint will flush all the dirty inode metadata before syncing
node pages.
Note that, this is doable, since we call mark_inode_dirty_sync() for all
inode's field change which needs to update on-disk inode as well.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

This patch registers all the inodes which have dirty metadata to sync when
checkpoint is doing.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

This patch calls mark_inode_dirty_sync() for the following on-disk inode
changes.

 -> largest
 -> ctime/mtime/atime
 -> i_current_depth
 -> i_xattr_nid
 -> i_pino
 -> i_advise
 -> i_flags
 -> i_mode
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

This patch introduces f2fs_i_links_write() to call mark_inode_dirty_sync() when
changing inode->i_links.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

This patch introduces f2fs_i_blocks_write() to call mark_inode_dirty_sync() when
changing inode->i_blocks.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

This patch introduces f2fs_i_size_write() to call mark_inode_dirty_sync() with
i_size_write().
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

This patch refactors to use inode pointer for set_inode_flag and
clear_inode_flag.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

This reverts commit b951a4ec.

 Conflicts:
	fs/f2fs/checkpoint.c

preparation for similar switch in ->setxattr() (see the next commit for
rationale).
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Let's gather the UUID related functions under one hood.
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: NMatt Fleming <matt@codeblueprint.co.uk>
Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Once we failed to merge inline data into inode page during flushing inline
inode, we will skip invoking inode_dec_dirty_pages, which makes dirty page
count incorrect, result in panic in ->evict_inode, Fix it.

------------[ cut here ]------------
kernel BUG at /home/yuchao/git/devf2fs/inode.c:336!
invalid opcode: 0000 [#1] PREEMPT SMP
CPU: 3 PID: 10004 Comm: umount Tainted: G           O    4.6.0-rc5+ #17
Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
task: f0c33000 ti: c5212000 task.ti: c5212000
EIP: 0060:[<f89aacb5>] EFLAGS: 00010202 CPU: 3
EIP is at f2fs_evict_inode+0x85/0x490 [f2fs]
EAX: 00000001 EBX: c4529ea0 ECX: 00000001 EDX: 00000000
ESI: c0131000 EDI: f89dd0a0 EBP: c5213e9c ESP: c5213e78
 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
CR0: 80050033 CR2: b75878c0 CR3: 1a36a700 CR4: 000406f0
Stack:
 c4529ea0 c4529ef4 c5213e8c c176d45c c4529ef4 00000000 c4529ea0 c4529fac
 f89dd0a0 c5213eb0 c1204a68 c5213ed8 c452a2b4 c6680930 c5213ec0 c1204b64
 c6680d44 c6680620 c5213eec c120588d ee84b000 ee84b5c0 c5214000 ee84b5e0
Call Trace:
 [<c176d45c>] ? _raw_spin_unlock+0x2c/0x50
 [<c1204a68>] evict+0xa8/0x170
 [<c1204b64>] dispose_list+0x34/0x50
 [<c120588d>] evict_inodes+0x10d/0x130
 [<c11ea941>] generic_shutdown_super+0x41/0xe0
 [<c1185190>] ? unregister_shrinker+0x40/0x50
 [<c1185190>] ? unregister_shrinker+0x40/0x50
 [<c11eac52>] kill_block_super+0x22/0x70
 [<f89af23e>] kill_f2fs_super+0x1e/0x20 [f2fs]
 [<c11eae1d>] deactivate_locked_super+0x3d/0x70
 [<c11eb383>] deactivate_super+0x43/0x60
 [<c1208ec9>] cleanup_mnt+0x39/0x80
 [<c1208f50>] __cleanup_mnt+0x10/0x20
 [<c107d091>] task_work_run+0x71/0x90
 [<c105725a>] exit_to_usermode_loop+0x72/0x9e
 [<c1001c7c>] do_fast_syscall_32+0x19c/0x1c0
 [<c176dd48>] sysenter_past_esp+0x45/0x74
EIP: [<f89aacb5>] f2fs_evict_inode+0x85/0x490 [f2fs] SS:ESP 0068:c5213e78
---[ end trace d30536330b7fdc58 ]---
Signed-off-by: NChao Yu <yuchao0@huawei.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

Given errors, this patch flushes pending bios as soon as possible.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

This patch avoids impossible error injection, ENOSPC, during recovery process.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

init_f2fs_fs does:
    1) f2fs_build_trace_ios
    2) init_inodecache
    3) create_node_manager_caches
    4) create_segment_manager_caches
    5) create_checkpoint_caches
    6) create_extent_cache
    7) kset_create_and_add
    8) kobject_init_and_add
    9) register_shrinker
    10) register_filesystem
    11) f2fs_create_root_stats
    12) proc_mkdir

exit_f2fs_fs should do cleanup in the reverse order
to make the code more clear.
Signed-off-by: NTiezhu Yang <kernelpatch@126.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

This patch uses percpu_counter to avoid stat_lock.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

This patch uses percpu_count for sbi->alloc_valid_block_count.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

This patch adds percpu_counter for # of dirty pages in inode.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

This patch substitutes percpu_counter for atomic_counter when counting
various types of pages.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>