exofs: Override read-ahead to align on stripe_size
* Set all inode->i_mapping->backing_dev_info to point to
the per super-block sb->s_bdi.
* Calculating a read_ahead that is:
- preferable 2 stripes long
(Future patch will add a mount option to override this)
- Minimum 128K aligned up to stripe-size
- Caped to maximum-IO-sizes round down to stripe_size.
(Max sizes are governed by max bio-size that fits in a page
times number-of-devices)
CC: Marc Dionne <marc.c.dionne@gmail.com>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index 78f5ad6..e87510f 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -390,6 +390,23 @@
return 0;
}
+static unsigned __ra_pages(struct exofs_layout *layout)
+{
+ const unsigned _MIN_RA = 32; /* min 128K read-ahead */
+ unsigned ra_pages = layout->group_width * layout->stripe_unit /
+ PAGE_SIZE;
+ unsigned max_io_pages = exofs_max_io_pages(layout, ~0);
+
+ ra_pages *= 2; /* two stripes */
+ if (ra_pages < _MIN_RA)
+ ra_pages = roundup(_MIN_RA, ra_pages / 2);
+
+ if (ra_pages > max_io_pages)
+ ra_pages = max_io_pages;
+
+ return ra_pages;
+}
+
/* @odi is valid only as long as @fscb_dev is valid */
static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev,
struct osd_dev_info *odi)
@@ -623,6 +640,7 @@
}
/* set up operation vectors */
+ sbi->bdi.ra_pages = __ra_pages(&sbi->layout);
sb->s_bdi = &sbi->bdi;
sb->s_fs_info = sbi;
sb->s_op = &exofs_sops;