linux.git/fs/f2fs/sysfs.c, branch v4.16

f2fs: support inode creation time

2018-01-25T22:10:39+00:00

This patch adds creation time field in inode layout to support showing
kstat.btime in ->statx.

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

f2fs: add an ioctl to disable GC for specific file

2018-01-22T22:56:35+00:00

This patch gives a flag to disable GC on given file, which would be useful, when
user wants to keep its block map. It also conducts in-place-update for dontmove
file.

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

f2fs: add reserved blocks for root user

2018-01-16T23:39:58+00:00

This patch allows root to reserve some blocks via mount option.

"-o reserve_root=N" means N x 4KB-sized blocks for root only.

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

f2fs: introduce sysfs readdir_ra to readahead inode block in readdir

2018-01-03T03:27:27+00:00

This patch introduces a sysfs interface readdir_ra to enable/disable
readaheading inode block in f2fs_readdir. When readdir_ra is enabled,
it improves the performance of "readdir + stat".

For 300,000 files:
	time find /data/test > /dev/null
disable readdir_ra: 1m25.69s real  0m01.94s user  0m50.80s system
enable  readdir_ra: 0m18.55s real  0m00.44s user  0m15.39s system

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

f2fs: add quota_ino feature infra

2017-11-06T00:42:01+00:00

This patch adds quota_ino feature infra to be used for quota files.

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

f2fs: export SSR allocation threshold

2017-11-06T00:41:57+00:00

This patch exports min_ssr_segments threshold in sysfs to let user
control triggering SSR allocation flexibly.

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

f2fs: support soft block reservation

2017-11-06T00:41:52+00:00

It supports to extend reserved_blocks sysfs interface to be soft
threshold, which allows user configure it exceeding current available
user space. This patch also introduces a new sysfs interface called
current_reserved_blocks, which shows the current blocks that have
already been reserved.

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

f2fs: support flexible inline xattr size

2017-11-06T00:41:50+00:00

Now, in product, more and more features based on file encryption were
introduced, their demand of xattr space is increasing, however, inline
xattr has fixed-size of 200 bytes, once inline xattr space is full, new
increased xattr data would occupy additional xattr block which may bring
us more space usage and performance regression during persisting.

In order to resolve above issue, it's better to expand inline xattr size
flexibly according to user's requirement.

So this patch introduces new filesystem feature 'flexible inline xattr',
and new mount option 'inline_xattr_size=%u', once mkfs enables the
feature, we can use the option to make f2fs supporting flexible inline
xattr size.

To support this feature, we add extra attribute i_inline_xattr_size in
inode layout, indicating that how many space inline xattr borrows from
block address mapping space in inode layout, by this, we can easily
locate and store flexible-sized inline xattr data in inode.

Inode disk layout:
  +----------------------+
  | .i_mode              |
  | ...                  |
  | .i_ext               |
  +----------------------+
  | .i_extra_isize       |
  | .i_inline_xattr_size |-----------+
  | ...                  |           |
  +----------------------+           |
  | .i_addr              |           |
  |  - block address or  |           |
  |  - inline data       |           |
  +----------------------+<---+      v
  |    inline xattr      |    +---inline xattr range
  +----------------------+<---+
  | .i_nid               |
  +----------------------+
  |   node_footer        |
  | (nid, ino, offset)   |
  +----------------------+

Note that, we have to cnosider backward compatibility which reserved
inline_data space, 200 bytes, all the time, reported by Sheng Yong.

Previous inline data or directory always reserved 200 bytes in inode layout,
even if inline_xattr is disabled. In order to keep inline_dentry's structure
for backward compatibility, we get the space back only from inline_data.

Signed-off-by: Chao Yu 
Reported-by: Sheng Yong 
Signed-off-by: Jaegeuk Kim

f2fs: show # of dirty segments via sysfs

2017-11-06T00:41:47+00:00

This patch adds one sysfs entry to show # of dirty segments which can be
used for gc timing by user.

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

f2fs: split discard policy

2017-10-26T08:44:08+00:00

There are many different scenarios such as fstrim, umount, urgent or
background where we will issue discards, actually, they need use
different policy in aspect of io aware, discard granularity, delay
interval and so on. But now they just share one common discard policy,
so there will be race when changing policy in between these scenarios,
the interference of changing discard policy will be very serious.

This patch changes to split discard policy for different scenarios.

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