linux.git/fs/f2fs/sysfs.c, branch for-next

f2fs: add a sysfs node to limit max read extent count per-inode

2024-11-23T15:48:13+00:00

Quoted:
"at this time, there are still 1086911 extent nodes in this zombie
extent tree that need to be cleaned up.

crash_arm64_sprd_v8.0.3++> extent_tree.node_cnt ffffff80896cc500
  node_cnt = {
    counter = 1086911
  },
"

As reported by Xiuhong, there will be a huge number of extent nodes
in extent tree, it may potentially cause:
- slab memory fragments
- extreme long time shrink on extent tree
- low mapping efficiency

Let's add a sysfs node to limit max read extent count for each inode,
by default, value of this threshold is 10240, it can be updated
according to user's requirement.

Reported-by: Xiuhong Wang 
Closes: https://lore.kernel.org/linux-f2fs-devel/20241112110627.1314632-1-xiuhong.wang@unisoc.com/
Signed-off-by: Xiuhong Wang 
Signed-off-by: Zhiguo Niu 
Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: clean up the unused variable additional_reserved_segments

2024-11-01T01:24:41+00:00

additional_reserved_segments was introduced by
commit 300a842937fb ("f2fs: fix to reserve space for IO align feature"),
and its initialization was deleted by
commit 87161a2b0aed ("f2fs: deprecate io_bits").

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

f2fs: introduce device aliasing file

2024-11-01T01:19:00+00:00

F2FS should understand how the device aliasing file works and support
deleting the file after use. A device aliasing file can be created by
mkfs.f2fs tool and it can map the whole device with an extent, not
using node blocks. The file space should be pinned and normally used for
read-only usages.

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

f2fs: allow F2FS_IPU_NOCACHE for pinned file

2024-09-23T15:42:13+00:00

This patch allows f2fs to submit bios of in-place writes on pinned file.

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

f2fs: add valid block ratio not to do excessive GC for one time GC

2024-09-11T03:33:08+00:00

We need to introduce a valid block ratio threshold not to trigger
excessive GC for zoned deivces. The initial value of it is 95%. So, F2FS
will stop the thread from intiating GC for sections having valid blocks
exceeding the ratio.

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

f2fs: create gc_no_zoned_gc_percent and gc_boost_zoned_gc_percent

2024-09-11T03:33:05+00:00

Added control knobs for gc_no_zoned_gc_percent and
gc_boost_zoned_gc_percent.

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

f2fs: add reserved_segments sysfs node

2024-09-11T03:32:57+00:00

For the fine tuning of GC behavior, add reserved_segments sysfs node.

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

f2fs: introduce migration_window_granularity

2024-09-11T03:32:54+00:00

We can control the scanning window granularity for GC migration. For
more frequent scanning and GC on zoned devices, we need a fine grained
control knob for it.

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

f2fs: Use sysfs_emit_at() to simplify code

2024-08-21T01:02:05+00:00

This file already uses sysfs_emit(). So be consistent and also use
sysfs_emit_at().

This slightly simplifies the code and makes it more readable.

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

f2fs: sysfs: support atgc_enabled

2024-08-15T15:26:40+00:00

When we add "atgc" to the fstab table, ATGC is not immediately enabled.
There is a 7-day time threshold, and we can use "atgc_enabled" to
show whether ATGC is enabled.

Signed-off-by: liujinbao1 
Reviewed-by: Chao Yu 
Signed-off-by: Jaegeuk Kim