jimzah/openafs
1
0
Fork 0
mirror of https://git.openafs.org/openafs.git synced 2025-01-19 15:30:14 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Cache bypass: make readpage deal with reads at end of file

Browse Source 
When a file's size is an exact multiple of the page size, the vfs
will issue a readpage for an extra page at the end, for which there
is no data.  Deal with it here instead of letting it trickle down
to the background daemon, which will issue an unnecessary read to the
server, and maybe get confused because there is no data.

Change-Id: If86ed785c4e9d50edb1a960142f726fa869c50fc
Reviewed-on: http://gerrit.openafs.org/3281
Reviewed-by: Matt Benjamin <matt@linuxbox.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
This commit is contained in:
Marc Dionne 2010-11-07 13:14:55 -05:00 committed by Derrick Brashear
parent 5988923898
commit 8ec31f2677
1 changed files with 11 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
src/afs/LINUX/osi_vnodeops.c
View File

@ -1820,6 +1820,17 @@ afs_linux_bypass_readpage(struct file *fp, struct page *pp)
struct nocache_read_request *ancr;
int code;
/*
* Special case: if page is at or past end of file, just zero it and set
* it as up to date.
*/
if (page_offset(pp) >= i_size_read(fp->f_mapping->host)) {
zero_user_segment(pp, 0, PAGE_CACHE_SIZE);
SetPageUptodate(pp);
unlock_page(pp);
return 0;
}
ClearPageError(pp);
/* receiver frees */