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| author | Jeff Layton <jlayton@redhat.com> | 2011-10-19 15:30:35 -0400 |
|---|---|---|
| committer | Jeff Layton <jlayton@redhat.com> | 2011-10-19 15:30:35 -0400 |
| commit | 66bfaadc3da74fecb4ba8b03f6b81d5f58b031fa (patch) | |
| tree | 6f0303db8a60ce0d6044ab5a48fbf6bd391b7bd4 | |
| parent | 5eba8ab3606621f7e175ae9f521d71f3ac534f82 (diff) | |
| download | linux-66bfaadc3da74fecb4ba8b03f6b81d5f58b031fa.tar.bz2 | |
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>
| -rw-r--r-- | fs/cifs/connect.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 06dfaacfea5d..f70d87d6ba61 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -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 /* |