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cifs: tune bdi.ra_pages in accordance with the rsize 

Tune bdi.ra_pages to be a multiple of the rsize. This prevents the VFS
from asking for pages that require small reads to satisfy.

Reviewed-and-Tested-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
This commit is contained in:
Jeff Layton 2011-10-19 15:30:35 -04:00
parent 5eba8ab360
commit 66bfaadc3d
1 changed files with 19 additions and 2 deletions
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21
fs/cifs/connect.c
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@ -3182,6 +3182,22 @@ cifs_get_volume_info(char *mount_data, const char *devname)
return volume_info;
}
/* make sure ra_pages is a multiple of rsize */
static inline unsigned int
cifs_ra_pages(struct cifs_sb_info *cifs_sb)
{
unsigned int reads;
unsigned int rsize_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
if (rsize_pages >= default_backing_dev_info.ra_pages)
return default_backing_dev_info.ra_pages;
else if (rsize_pages == 0)
return rsize_pages;
reads = default_backing_dev_info.ra_pages / rsize_pages;
return reads * rsize_pages;
}
int
cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
{
@ -3200,8 +3216,6 @@ cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
if (rc)
return rc;
cifs_sb->bdi.ra_pages = default_backing_dev_info.ra_pages;
#ifdef CONFIG_CIFS_DFS_UPCALL
try_mount_again:
/* cleanup activities if we're chasing a referral */
@ -3269,6 +3283,9 @@ try_mount_again:
cifs_sb->wsize = cifs_negotiate_wsize(tcon, volume_info);
cifs_sb->rsize = cifs_negotiate_rsize(tcon, volume_info);
/* tune readahead according to rsize */
cifs_sb->bdi.ra_pages = cifs_ra_pages(cifs_sb);
remote_path_check:
#ifdef CONFIG_CIFS_DFS_UPCALL
/*