f2fs: preload extent_cache for POSIX_FADV_WILLNEED

Jaegeuk Kim · Jaegeuk Kim · commit 3e729e50d01e · 2023-09-26T10:38:56.000-07:00
This patch tries to preload extent_cache given POSIX_FADV_WILLNEED, which is
more useful for generic usecases.

Reviewed-by: Chao Yu &lt;chao@kernel.org&gt;
Signed-off-by: Jaegeuk Kim &lt;jaegeuk@kernel.org&gt;
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
@@ -4858,6 +4858,9 @@ static int f2fs_file_fadvise(struct file *filp, loff_t offset, loff_t len,
 		filp->f_mode &= ~FMODE_RANDOM;
 		spin_unlock(&filp->f_lock);
 		return 0;
+	} else if (advice == POSIX_FADV_WILLNEED && offset == 0) {
+		/* Load extent cache at the first readahead. */
+		f2fs_precache_extents(inode);
 	}
 
 	err = generic_fadvise(filp, offset, len, advice);

Original file line number	Diff line number	Diff line change
`@@ -4858,6 +4858,9 @@ static int f2fs_file_fadvise(struct file *filp, loff_t offset, loff_t len,`
`4858`	`4858`	`filp->f_mode &= ~FMODE_RANDOM;`
`4859`	`4859`	`spin_unlock(&filp->f_lock);`
`4860`	`4860`	`return 0;`
	`4861`	`+ } else if (advice == POSIX_FADV_WILLNEED && offset == 0) {`
	`4862`	`+ /* Load extent cache at the first readahead. */`
	`4863`	`+ f2fs_precache_extents(inode);`
`4861`	`4864`	`}`
`4862`	`4865`
`4863`	`4866`	`err = generic_fadvise(filp, offset, len, advice);`