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authorYan, Zheng <zyan@redhat.com>2014-11-14 17:10:07 +0300
committerIlya Dryomov <idryomov@redhat.com>2014-12-17 20:09:52 +0300
commit3738daa68a5121ad7dd0318bca931e2a6afb0e8c (patch)
tree8cb3a27c974fa834c2241e9f7335be405053492b /fs/ceph/file.c
parent01deead041e03c9a6b4e1b2dd165dee4cced6112 (diff)
downloadlinux-3738daa68a5121ad7dd0318bca931e2a6afb0e8c.tar.xz
ceph: fetch inline data when getting Fcr cap refs
we can't use getattr to fetch inline data after getting Fcr caps, because it can cause deadlock. The solution is try bringing inline data to page cache when not holding any cap, and hope the inline data page is still there after getting the Fcr caps. If the page is still there, pin it in page cache for later IO. Signed-off-by: Yan, Zheng <zyan@redhat.com>
Diffstat (limited to 'fs/ceph/file.c')
-rw-r--r--fs/ceph/file.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index c03ac4c4bcd1..861b9954a63a 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -805,6 +805,7 @@ static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
size_t len = iocb->ki_nbytes;
struct inode *inode = file_inode(filp);
struct ceph_inode_info *ci = ceph_inode(inode);
+ struct page *pinned_page = NULL;
ssize_t ret;
int want, got = 0;
int checkeof = 0, read = 0;
@@ -817,7 +818,7 @@ again:
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);
+ ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page);
if (ret < 0)
return ret;
@@ -840,6 +841,10 @@ again:
}
dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
+ if (pinned_page) {
+ page_cache_release(pinned_page);
+ pinned_page = NULL;
+ }
ceph_put_cap_refs(ci, got);
if (checkeof && ret >= 0) {
@@ -924,7 +929,8 @@ retry_snap:
else
want = CEPH_CAP_FILE_BUFFER;
got = 0;
- err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, pos + count);
+ err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, pos + count,
+ &got, NULL);
if (err < 0)
goto out;
@@ -1225,7 +1231,7 @@ static long ceph_fallocate(struct file *file, int mode,
else
want = CEPH_CAP_FILE_BUFFER;
- ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, endoff);
+ ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, endoff, &got, NULL);
if (ret < 0)
goto unlock;