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ceph: try getting buffer capability for readahead/fadvise

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For readahead/fadvise cases, caller of ceph_readpages does not
hold buffer capability. Pages can be added to page cache while
there is no buffer capability. This can cause data integrity
issue.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng
2016-10-25 10:51:55 +08:00
committed by Ilya Dryomov
parent 5c341ee328
commit 2b1ac852eb
4 changed files with 73 additions and 11 deletions
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3
fs/ceph/file.c
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@@ -1249,8 +1249,9 @@ again:
dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
ceph_cap_string(got));
current->journal_info = filp;
ret = generic_file_read_iter(iocb, to);
current->journal_info = NULL;
}
dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);