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| author | Sage Weil <sage@newdream.net> | 2010-05-27 10:40:43 -0700 |
|---|---|---|
| committer | Sage Weil <sage@newdream.net> | 2010-08-01 20:11:39 -0700 |
| commit | 2962507ca204f886967e1a089d9bec206d427c22 (patch) | |
| tree | e9cec16b13ad1d8e41c288658e62fb3bf1c66859 /fs/ceph/caps.c | |
| parent | 33caad324b88f75f42d836735d86feaafb3b40cf (diff) | |
| download | linux-stable-2962507ca204f886967e1a089d9bec206d427c22.tar.gz linux-stable-2962507ca204f886967e1a089d9bec206d427c22.tar.bz2 linux-stable-2962507ca204f886967e1a089d9bec206d427c22.zip | |
ceph: perform lazy reads when file mode and caps permit
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>
Diffstat (limited to 'fs/ceph/caps.c')
| -rw-r--r-- | fs/ceph/caps.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index 1a70a3ebf013..b28915d5f404 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -482,8 +482,8 @@ static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap, * Each time we receive FILE_CACHE anew, we increment * i_rdcache_gen. */ - if ((issued & CEPH_CAP_FILE_CACHE) && - (had & CEPH_CAP_FILE_CACHE) == 0) + if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) && + (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) ci->i_rdcache_gen++; /* @@ -1509,11 +1509,13 @@ retry_locked: ci->i_wrbuffer_ref == 0 && /* no dirty pages... */ ci->i_rdcache_gen && /* may have cached pages */ (file_wanted == 0 || /* no open files */ - (revoking & CEPH_CAP_FILE_CACHE)) && /* or revoking cache */ + (revoking & (CEPH_CAP_FILE_CACHE| + CEPH_CAP_FILE_LAZYIO))) && /* or revoking cache */ !tried_invalidate) { dout("check_caps trying to invalidate on %p\n", inode); if (try_nonblocking_invalidate(inode) < 0) { - if (revoking & CEPH_CAP_FILE_CACHE) { + if (revoking & (CEPH_CAP_FILE_CACHE| + CEPH_CAP_FILE_LAZYIO)) { dout("check_caps queuing invalidate\n"); queue_invalidate = 1; ci->i_rdcache_revoking = ci->i_rdcache_gen; @@ -2276,7 +2278,8 @@ static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant, * try to invalidate (once). (If there are dirty buffers, we * will invalidate _after_ writeback.) */ - if (((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) && + if (((cap->issued & ~newcaps) & (CEPH_CAP_FILE_CACHE| + CEPH_CAP_FILE_LAZYIO)) && !ci->i_wrbuffer_ref) { if (try_nonblocking_invalidate(inode) == 0) { revoked_rdcache = 1; @@ -2374,7 +2377,8 @@ static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant, writeback = 1; /* will delay ack */ else if (dirty & ~newcaps) check_caps = 1; /* initiate writeback in check_caps */ - else if (((used & ~newcaps) & CEPH_CAP_FILE_CACHE) == 0 || + else if (((used & ~newcaps) & (CEPH_CAP_FILE_CACHE| + CEPH_CAP_FILE_LAZYIO)) == 0 || revoked_rdcache) check_caps = 2; /* send revoke ack in check_caps */ cap->issued = newcaps; |