From 2962507ca204f886967e1a089d9bec206d427c22 Mon Sep 17 00:00:00 2001 From: Sage Weil Date: Thu, 27 May 2010 10:40:43 -0700 Subject: 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 --- fs/ceph/file.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) (limited to 'fs/ceph/file.c') diff --git a/fs/ceph/file.c b/fs/ceph/file.c index 85c86ed5f4c..2329244f427 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -740,28 +740,32 @@ static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov, unsigned long nr_segs, loff_t pos) { struct file *filp = iocb->ki_filp; + struct ceph_file_info *fi = filp->private_data; loff_t *ppos = &iocb->ki_pos; size_t len = iov->iov_len; struct inode *inode = filp->f_dentry->d_inode; struct ceph_inode_info *ci = ceph_inode(inode); void *base = iov->iov_base; ssize_t ret; - int got = 0; + int want, got = 0; int checkeof = 0, read = 0; dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n", inode, ceph_vinop(inode), pos, (unsigned)len, inode); again: __ceph_do_pending_vmtruncate(inode); - ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, CEPH_CAP_FILE_CACHE, - &got, -1); + if (fi->fmode & CEPH_FILE_MODE_LAZY) + want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; + else + want = CEPH_CAP_FILE_CACHE; + ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1); if (ret < 0) goto out; dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n", inode, ceph_vinop(inode), pos, (unsigned)len, ceph_cap_string(got)); - if ((got & CEPH_CAP_FILE_CACHE) == 0 || + if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 || (iocb->ki_filp->f_flags & O_DIRECT) || (inode->i_sb->s_flags & MS_SYNCHRONOUS)) /* hmm, this isn't really async... */ -- cgit v1.2.3-18-g5258