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| author | Yan, Zheng <zheng.z.yan@intel.com> | 2013-09-18 09:44:13 +0800 |
|---|---|---|
| committer | Sage Weil <sage@inktank.com> | 2013-09-30 14:49:53 -0700 |
| commit | 81c6aea5275eae453719d7f3924da07e668265c5 (patch) | |
| tree | 97fab33034d7b3f99cf4e875c1ed5c50bff54b78 /fs/ceph/dir.c | |
| parent | 53e879a485f9def0e55c404dbc7187470a01602d (diff) | |
| download | linux-81c6aea5275eae453719d7f3924da07e668265c5.tar.gz linux-81c6aea5275eae453719d7f3924da07e668265c5.tar.bz2 linux-81c6aea5275eae453719d7f3924da07e668265c5.zip | |
ceph: handle frag mismatch between readdir request and reply
If client has outdated directory fragments information, it may request
readdir an non-existent directory fragment. In this case, the MDS finds
an approximate directory fragment and sends its contents back to the
client. When receiving a reply with fragment that is different than the
requested one, the client need to reset the 'readdir offset'.
Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Sage Weil <sage@inktank.com>
Diffstat (limited to 'fs/ceph/dir.c')
| -rw-r--r-- | fs/ceph/dir.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c index 868b61d56cac..2a0bcaeb189a 100644 --- a/fs/ceph/dir.c +++ b/fs/ceph/dir.c @@ -352,8 +352,18 @@ more: } /* note next offset and last dentry name */ + rinfo = &req->r_reply_info; + if (le32_to_cpu(rinfo->dir_dir->frag) != frag) { + frag = le32_to_cpu(rinfo->dir_dir->frag); + if (ceph_frag_is_leftmost(frag)) + fi->next_offset = 2; + else + fi->next_offset = 0; + off = fi->next_offset; + } fi->offset = fi->next_offset; fi->last_readdir = req; + fi->frag = frag; if (req->r_reply_info.dir_end) { kfree(fi->last_name); @@ -363,7 +373,6 @@ more: else fi->next_offset = 0; } else { - rinfo = &req->r_reply_info; err = note_last_dentry(fi, rinfo->dir_dname[rinfo->dir_nr-1], rinfo->dir_dname_len[rinfo->dir_nr-1]); |