linux.git/fs/f2fs/segment.c, branch v4.5

f2fs: monitor the number of background checkpoint

2016-01-11T23:56:42+00:00

This patch adds to show the number of background checkpoint.

Signed-off-by: Jaegeuk Kim

f2fs: detect idle time depending on user behavior

2016-01-11T23:56:37+00:00

This patch adds last time that user requested filesystem operations.
This information is used to detect whether system is idle or not later.

Signed-off-by: Jaegeuk Kim

f2fs: introduce time and interval facility

2016-01-11T23:36:27+00:00

This patch adds time and interval arrays to store some timing variables.

Signed-off-by: Jaegeuk Kim

f2fs: clean up f2fs_balance_fs

2016-01-08T19:45:23+00:00

This patch adds one parameter to clean up all the callers of f2fs_balance_fs.

Signed-off-by: Jaegeuk Kim

f2fs: report error of do_checkpoint

2015-12-30T18:14:09+00:00

do_checkpoint and write_checkpoint can fail due to reasons like triggering
in a readonly fs or encountering IO error of storage device.

So it's better to report such error info to user, let user be aware of
failure of doing checkpoint.

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

f2fs: support data flush in background

2015-12-17T17:53:26+00:00

Previously, when finishing a checkpoint, we have persisted all fs meta
info including meta inode, node inode, dentry page of directory inode, so,
after a sudden power cut, f2fs can recover from last checkpoint with full
directory structure.

But during checkpoint, we didn't flush dirty pages of regular and symlink
inode, so such dirty datas still in memory will be lost in that moment of
power off.

In order to reduce the chance of lost data, this patch enables
f2fs_balance_fs_bg with the ability of data flushing. It will try to flush
user data before starting a checkpoint. So user's data written after last
checkpoint which may not be fsynced could be saved.

When we mount with data_flush option, after every period of cp_interval
(could be configured in sysfs: /sys/fs/f2fs/device/cp_interval) seconds
user data could be flushed into device once f2fs_balance_fs_bg was called
in kworker thread or gc thread.

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

f2fs: enhance the bit operation for SSR

2015-12-09T17:50:32+00:00

This patch enhances the existing bit operation when f2fs allocates SSR
blocks.

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

f2fs: clean up code with __has_cursum_space

2015-12-04T20:07:55+00:00

Clean up codes in lookup_journal_in_cursum() with __has_cursum_space().

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

f2fs: clear page uptodate when dropping cache for atomic write

2015-12-04T19:52:35+00:00

We should clear uptodate flag for all pages atomic written when we drop
them, otherwise before these cached pages were reclaimed or invalidated
eventually, we will see invalid data when hitting them again.

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

f2fs: optimize __find_rev_next_bit

2015-12-04T19:52:35+00:00

1. Skip __reverse_ulong if the bitmap is empty.
2. Reduce branches and codes.
According to my test, the performance of this new version is 5% higher on
an empty bitmap of 64bytes, and remains about the same in the worst scenario.

Signed-off-by: Fan li 
Signed-off-by: Jaegeuk Kim