f2fs: show the list of donation files

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This patch introduces a proc entry to show the currently enrolled donation
files.

- "File path" indicates a file.
- "Status"
 a. "Donated" means the file is registed in the donation list by
    fadvise(offset, length, POSIX_FADV_NOREUSE)
 b. "Evicted" means the donated pages were reclaimed.
- "Offset (kb)" and "Length (kb) show the registered donation range.
- "Cached pages (kb)" shows the amount of cached pages in the inode page cache.

For example,

 # of files  : 2
 File path                                              Status Donation offset (kb)   Donation size (kb)  File cached size (kb)
---
 /local/test2                                          Donated                    0              1048576                2097152
 /local/test                                           Evicted                    0              1048576                1048576

Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

...

This commit is contained in:

Jaegeuk Kim 2025-08-11 23:50:25 +00:00

parent ff11d8701b

commit f1a49c1b11

1 changed files with 64 additions and 0 deletions

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fs/f2fs/sysfs.c

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