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ceph: perform lazy reads when file mode and caps permit

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If the file mode is marked as "lazy," perform cached/buffered reads when
the caps permit it.  Adjust the rdcache_gen and invalidation logic
accordingly so that we manage our cache based on the FILE_CACHE -or-
FILE_LAZYIO cap bits.

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil
2010-05-27 10:40:43 -07:00
parent 33caad324b
commit 2962507ca2
4 changed files with 22 additions and 13 deletions
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5
fs/ceph/inode.c
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@@ -442,8 +442,9 @@ int ceph_fill_file_size(struct inode *inode, int issued,
* the file is either opened or mmaped
*/
if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
CEPH_CAP_FILE_EXCL)) ||
CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
CEPH_CAP_FILE_EXCL|
CEPH_CAP_FILE_LAZYIO)) ||
mapping_mapped(inode->i_mapping) ||
__ceph_caps_file_wanted(ci)) {
ci->i_truncate_pending++;