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authorDaeho Jeong <daehojeong@google.com>2021-08-03 07:22:45 +0300
committerJaegeuk Kim <jaegeuk@kernel.org>2021-08-03 21:16:22 +0300
commit0f6b56ec958d49e2b3dc955cdac6b62702c04b72 (patch)
tree7d6b246158ca89612e6004bf773fa1224a87d5ac /fs/f2fs
parent4f993264fe2965c344f223d854ccbb549b16ed71 (diff)
downloadlinux-0f6b56ec958d49e2b3dc955cdac6b62702c04b72.tar.xz
f2fs: add sysfs node to control ra_pages for fadvise seq file
fadvise() allows the user to expand the readahead window to double with POSIX_FADV_SEQUENTIAL, now. But, in some use cases, it is not that sufficient and we need to meet the need in a restricted way. We can control the multiplier value of bdi device readahead between 2 (default) and 256 for POSIX_FADV_SEQUENTIAL advise option. Signed-off-by: Daeho Jeong <daehojeong@google.com> Reviewed-by: Chao Yu <chao@kernel.org> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs')
-rw-r--r--fs/f2fs/f2fs.h5
-rw-r--r--fs/f2fs/file.c30
-rw-r--r--fs/f2fs/super.c1
-rw-r--r--fs/f2fs/sysfs.c10
4 files changed, 46 insertions, 0 deletions
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 8d4665a7a0fb..1b4c482d08e2 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1749,6 +1749,8 @@ struct f2fs_sb_info {
unsigned int gc_segment_mode; /* GC state for reclaimed segments */
unsigned int gc_reclaimed_segs[MAX_GC_MODE]; /* Reclaimed segs for each mode */
+ unsigned long seq_file_ra_mul; /* multiplier for ra_pages of seq. files in fadvise */
+
#ifdef CONFIG_F2FS_FS_COMPRESSION
struct kmem_cache *page_array_slab; /* page array entry */
unsigned int page_array_slab_size; /* default page array slab size */
@@ -4003,6 +4005,9 @@ void f2fs_destroy_extent_cache(void);
/*
* sysfs.c
*/
+#define MIN_RA_MUL 2
+#define MAX_RA_MUL 256
+
int __init f2fs_init_sysfs(void);
void f2fs_exit_sysfs(void);
int f2fs_register_sysfs(struct f2fs_sb_info *sbi);
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index e931782abdab..7d8ee60f6c1f 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -23,6 +23,7 @@
#include <linux/nls.h>
#include <linux/sched/signal.h>
#include <linux/fileattr.h>
+#include <linux/fadvise.h>
#include "f2fs.h"
#include "node.h"
@@ -4344,6 +4345,34 @@ out:
return ret;
}
+static int f2fs_file_fadvise(struct file *filp, loff_t offset, loff_t len,
+ int advice)
+{
+ struct inode *inode;
+ struct address_space *mapping;
+ struct backing_dev_info *bdi;
+
+ if (advice == POSIX_FADV_SEQUENTIAL) {
+ inode = file_inode(filp);
+ if (S_ISFIFO(inode->i_mode))
+ return -ESPIPE;
+
+ mapping = filp->f_mapping;
+ if (!mapping || len < 0)
+ return -EINVAL;
+
+ bdi = inode_to_bdi(mapping->host);
+ filp->f_ra.ra_pages = bdi->ra_pages *
+ F2FS_I_SB(inode)->seq_file_ra_mul;
+ spin_lock(&filp->f_lock);
+ filp->f_mode &= ~FMODE_RANDOM;
+ spin_unlock(&filp->f_lock);
+ return 0;
+ }
+
+ return generic_fadvise(filp, offset, len, advice);
+}
+
#ifdef CONFIG_COMPAT
struct compat_f2fs_gc_range {
u32 sync;
@@ -4472,4 +4501,5 @@ const struct file_operations f2fs_file_operations = {
#endif
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
+ .fadvise = f2fs_file_fadvise,
};
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index a4fed184b811..84cd085020cd 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -3466,6 +3466,7 @@ static void init_sb_info(struct f2fs_sb_info *sbi)
sbi->next_victim_seg[FG_GC] = NULL_SEGNO;
sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
sbi->migration_granularity = sbi->segs_per_sec;
+ sbi->seq_file_ra_mul = MIN_RA_MUL;
sbi->dir_level = DEF_DIR_LEVEL;
sbi->interval_time[CP_TIME] = DEF_CP_INTERVAL;
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index f98afd9f9380..0954761341d7 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -540,6 +540,14 @@ out:
return count;
}
+ if (!strcmp(a->attr.name, "seq_file_ra_mul")) {
+ if (t >= MIN_RA_MUL && t <= MAX_RA_MUL)
+ sbi->seq_file_ra_mul = t;
+ else
+ return -EINVAL;
+ return count;
+ }
+
*ui = (unsigned int)t;
return count;
@@ -765,6 +773,7 @@ F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_candidate_count, max_candidate_cou
F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_age_weight, age_weight);
F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_age_threshold, age_threshold);
+F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, seq_file_ra_mul, seq_file_ra_mul);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_segment_mode, gc_segment_mode);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_reclaimed_segments, gc_reclaimed_segs);
@@ -840,6 +849,7 @@ static struct attribute *f2fs_attrs[] = {
ATTR_LIST(atgc_candidate_count),
ATTR_LIST(atgc_age_weight),
ATTR_LIST(atgc_age_threshold),
+ ATTR_LIST(seq_file_ra_mul),
ATTR_LIST(gc_segment_mode),
ATTR_LIST(gc_reclaimed_segments),
NULL,