All users of VM_MAX_READAHEAD actually convert it to kbytes and then to
pages. Define the macro explicitly as (SZ_128K / PAGE_SIZE). This
simplifies the expression in every filesystem. Also rename the macro to
VM_READAHEAD_PAGES to properly convey its meaning. Finally remove unused
VM_MIN_READAHEAD
Signed-off-by: Nikolay Borisov <nborisov@xxxxxxxx>
---
block/blk-core.c | 3 +--
fs/9p/vfs_super.c | 2 +-
fs/afs/super.c | 2 +-
fs/btrfs/disk-io.c | 2 +-
fs/fuse/inode.c | 2 +-
include/linux/mm.h | 4 ++--
6 files changed, 7 insertions(+), 8 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index deb56932f8c4..d25c8564a117 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1031,8 +1031,7 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id,
if (!q->stats)
goto fail_stats;
- q->backing_dev_info->ra_pages =
- (VM_MAX_READAHEAD * 1024) / PAGE_SIZE;
+ q->backing_dev_info->ra_pages = VM_READAHEAD_PAGES;
q->backing_dev_info->capabilities = BDI_CAP_CGROUP_WRITEBACK;
q->backing_dev_info->name = "block";
q->node = node_id;
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index 48ce50484e80..10d3bd3f534b 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -92,7 +92,7 @@ v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
return ret;
if (v9ses->cache)
- sb->s_bdi->ra_pages = (VM_MAX_READAHEAD * 1024)/PAGE_SIZE;
+ sb->s_bdi->ra_pages = VM_READAHEAD_PAGES;
sb->s_flags |= SB_ACTIVE | SB_DIRSYNC;
if (!v9ses->cache)
diff --git a/fs/afs/super.c b/fs/afs/super.c
index dcd07fe99871..e684f6769b15 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -399,7 +399,7 @@ static int afs_fill_super(struct super_block *sb,
ret = super_setup_bdi(sb);
if (ret)
return ret;
- sb->s_bdi->ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
+ sb->s_bdi->ra_pages = VM_READAHEAD_PAGES;
/* allocate the root inode and dentry */
if (as->dyn_root) {
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 6d776717d8b3..ee47d8b5b50c 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2900,7 +2900,7 @@ int open_ctree(struct super_block *sb,
sb->s_bdi->congested_fn = btrfs_congested_fn;
sb->s_bdi->congested_data = fs_info;
sb->s_bdi->capabilities |= BDI_CAP_CGROUP_WRITEBACK;
- sb->s_bdi->ra_pages = VM_MAX_READAHEAD * SZ_1K / PAGE_SIZE;
+ sb->s_bdi->ra_pages = VM_READAHEAD_PAGES;
sb->s_bdi->ra_pages *= btrfs_super_num_devices(disk_super);
sb->s_bdi->ra_pages = max(sb->s_bdi->ra_pages, SZ_4M / PAGE_SIZE);
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 568abed20eb2..d3eab53a29b7 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -1009,7 +1009,7 @@ static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
if (err)
return err;
- sb->s_bdi->ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_SIZE;
+ sb->s_bdi->ra_pages = VM_READAHEAD_PAGES;
/* fuse does it's own writeback accounting */
sb->s_bdi->capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT;
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 5411de93a363..1579082af177 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -26,6 +26,7 @@
#include <linux/page_ref.h>
#include <linux/memremap.h>
#include <linux/overflow.h>
+#include <linux/sizes.h>
struct mempolicy;
struct anon_vma;
@@ -2396,8 +2397,7 @@ int __must_check write_one_page(struct page *page);
void task_dirty_inc(struct task_struct *tsk);
/* readahead.c */
-#define VM_MAX_READAHEAD 128 /* kbytes */
-#define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
+#define VM_READAHEAD_PAGES (SZ_128K / PAGE_SIZE)
int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
pgoff_t offset, unsigned long nr_to_read);
--
2.17.1
