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| author | Weston Andros Adamson <dros@primarydata.com> | 2014-09-05 16:34:29 -0400 |
|---|---|---|
| committer | Tom Haynes <loghyr@primarydata.com> | 2015-02-03 11:06:44 -0800 |
| commit | 309a1d65b11de24d172f7dbbc21583ebd649c912 (patch) | |
| tree | 3f01d1ddf35fc8b2b27f4468e3bfa7862588ff8a /fs/nfs/write.c | |
| parent | 180bb5ec06ce3a95dccc751fbf6bf11d3003da98 (diff) | |
| download | linux-309a1d65b11de24d172f7dbbc21583ebd649c912.tar.bz2 | |
nfs: handle overlapping reqs in lock_and_join
This is needed for mirrored DS support, where multuple requests
cover the same range.
Signed-off-by: Weston Andros Adamson <dros@primarydata.com>
Diffstat (limited to 'fs/nfs/write.c')
| -rw-r--r-- | fs/nfs/write.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 8800bd3b235d..e9974574b19a 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -473,13 +473,18 @@ try_again: do { /* * Subrequests are always contiguous, non overlapping - * and in order. If not, it's a programming error. + * and in order - but may be repeated (mirrored writes). */ - WARN_ON_ONCE(subreq->wb_offset != - (head->wb_offset + total_bytes)); - - /* keep track of how many bytes this group covers */ - total_bytes += subreq->wb_bytes; + if (subreq->wb_offset == (head->wb_offset + total_bytes)) { + /* keep track of how many bytes this group covers */ + total_bytes += subreq->wb_bytes; + } else if (WARN_ON_ONCE(subreq->wb_offset < head->wb_offset || + ((subreq->wb_offset + subreq->wb_bytes) > + (head->wb_offset + total_bytes)))) { + nfs_page_group_unlock(head); + spin_unlock(&inode->i_lock); + return ERR_PTR(-EIO); + } if (!nfs_lock_request(subreq)) { /* releases page group bit lock and |