linux.git/fs/f2fs/checkpoint.c, branch v4.2

f2fs: introduce update_meta_page

2015-06-01T23:21:00+00:00

Add a help function update_meta_page() to update meta page with specified
buffer.

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs crypto: add encryption support in read/write paths

2015-05-28T22:41:52+00:00

This patch adds encryption support in read and write paths.

Note that, in f2fs, we need to consider cleaning operation.
In cleaning procedure, we must avoid encrypting and decrypting written blocks.
So, this patch implements move_encrypted_block().

Signed-off-by: Jaegeuk Kim

f2fs: issue discard with finally produced len and minlen

2015-05-28T22:41:39+00:00

This patch determines to issue discard commands by comparing given minlen and
the length of produced final candidates.

Signed-off-by: Jaegeuk Kim

f2fs: introduce discard_map for f2fs_trim_fs

2015-05-28T22:41:39+00:00

This patch adds a bitmap for discard issues from f2fs_trim_fs.
There-in rule is to issue discard commands only for invalidated blocks
after mount.
Once mount is done, f2fs_trim_fs trims out whole invalid area.
After ehn, it will not issue and discrads redundantly.

Signed-off-by: Jaegeuk Kim

f2fs: revmove spin_lock for write_orphan_inodes

2015-05-28T22:41:38+00:00

This patch removes spin_lock, since this is covered by f2fs_lock_op already.
And, we should avoid to use page operations inside spin_lock.

Signed-off-by: Jaegeuk Kim

f2fs: add sbi and page pointer in f2fs_io_info

2015-05-28T22:41:32+00:00

This patch adds f2fs_sb_info and page pointers in f2fs_io_info structure.
With this change, we can reduce a lot of parameters for IO functions.

Signed-off-by: Jaegeuk Kim

f2fs: use is_valid_blkaddr to verify blkaddr for readability

2015-05-07T18:38:32+00:00

Export is_valid_blkaddr() and use it to replace some codes for readability.

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: pass checkpoint reason on roll-forward recovery

2015-04-16T16:45:40+00:00

This patch adds CP_RECOVERY to remain recovery information for checkpoint.
And, it makes sure writing checkpoint in this case.

Signed-off-by: Jaegeuk Kim

f2fs: cleanup statement about max orphan inodes calc

2015-04-10T22:08:38+00:00

Through each macro, we can read the meaning easily.

Signed-off-by: Changman Lee 
Signed-off-by: Jaegeuk Kim

f2fs: add cond_resched() to sync_dirty_dir_inodes()

2015-04-10T22:08:30+00:00

In a preempt-off enviroment a alot of FS activity (write/delete) I run
into a CPU stall:

| NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u2:2:59]
| Modules linked in:
| CPU: 0 PID: 59 Comm: kworker/u2:2 Tainted: G        W      3.19.0-00010-g10c11c51ffed #153
| Workqueue: writeback bdi_writeback_workfn (flush-179:0)
| task: df230000 ti: df23e000 task.ti: df23e000
| PC is at __submit_merged_bio+0x6c/0x110
| LR is at f2fs_submit_merged_bio+0x74/0x80
…
| [] (gic_handle_irq) from [] (__irq_svc+0x44/0x5c)
| Exception stack(0xdf23fb48 to 0xdf23fb90)
| fb40:                   deef3484 ffff0001 ffff0001 00000027 deef3484 00000000
| fb60: deef3440 00000000 de426000 deef34ec deefc440 df23fbb4 df23fbb8 df23fb90
| fb80: c02191f0 c0218fa0 60000013 ffffffff
| [] (__irq_svc) from [] (__submit_merged_bio+0x6c/0x110)
| [] (__submit_merged_bio) from [] (f2fs_submit_merged_bio+0x74/0x80)
| [] (f2fs_submit_merged_bio) from [] (sync_dirty_dir_inodes+0x70/0x78)
| [] (sync_dirty_dir_inodes) from [] (write_checkpoint+0x104/0xc10)
| [] (write_checkpoint) from [] (f2fs_sync_fs+0x80/0xbc)
| [] (f2fs_sync_fs) from [] (f2fs_balance_fs_bg+0x4c/0x68)
| [] (f2fs_balance_fs_bg) from [] (f2fs_write_node_pages+0x40/0x110)
| [] (f2fs_write_node_pages) from [] (do_writepages+0x34/0x48)
| [] (do_writepages) from [] (__writeback_single_inode+0x50/0x228)
| [] (__writeback_single_inode) from [] (writeback_sb_inodes+0x1a8/0x378)
| [] (writeback_sb_inodes) from [] (__writeback_inodes_wb+0x90/0xc8)
| [] (__writeback_inodes_wb) from [] (wb_writeback+0x1dc/0x28c)
| [] (wb_writeback) from [] (bdi_writeback_workfn+0x2ac/0x460)
| [] (bdi_writeback_workfn) from [] (process_one_work+0x11c/0x3a4)
| [] (process_one_work) from [] (worker_thread+0x17c/0x490)
| [] (worker_thread) from [] (kthread+0xec/0x100)
| [] (kthread) from [] (ret_from_fork+0x14/0x24)

As it turns out, the code loops in sync_dirty_dir_inodes() and waits for
others to make progress but since it never leaves the CPU there is no
progress made. At the time of this stall, there is also a rm process
blocked:
| rm              R running      0  1989   1774 0x00000000
| [] (__schedule) from [] (__cond_resched+0x30/0x4c)
| [] (__cond_resched) from [] (_cond_resched+0x4c/0x54)
| [] (_cond_resched) from [] (truncate_inode_pages_range+0x1f0/0x5e8)
| [] (truncate_inode_pages_range) from [] (truncate_inode_pages+0x28/0x30)
| [] (truncate_inode_pages) from [] (truncate_inode_pages_final+0x60/0x64)
| [] (truncate_inode_pages_final) from [] (f2fs_evict_inode+0x4c/0x268)
| [] (f2fs_evict_inode) from [] (evict+0x94/0x140)
| [] (evict) from [] (iput+0xc8/0x134)
| [] (iput) from [] (d_delete+0x154/0x180)
| [] (d_delete) from [] (vfs_rmdir+0x114/0x12c)
| [] (vfs_rmdir) from [] (do_rmdir+0x158/0x168)
| [] (do_rmdir) from [] (SyS_unlinkat+0x30/0x3c)
| [] (SyS_unlinkat) from [] (ret_fast_syscall+0x0/0x4c)

As explained by Jaegeuk Kim:
|This inode is the directory (c.f., do_rmdir) causing a infinite loop on
|sync_dirty_dir_inodes.
|The sync_dirty_dir_inodes tries to flush dirty dentry pages, but if the
|inode is under eviction, it submits bios and do it again until eviction
|is finished.

This patch adds a cond_resched() (as suggested by Jaegeuk) after a BIO
is submitted so other thread can make progress.

Signed-off-by: Sebastian Andrzej Siewior 
[Jaegeuk Kim: change fs/f2fs to f2fs in subject as naming convention]
Signed-off-by: Jaegeuk Kim