diff options
| author | Trond Myklebust <trond.myklebust@primarydata.com> | 2017-07-17 16:58:07 -0400 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@primarydata.com> | 2017-08-15 11:54:47 -0400 |
| commit | 7e8a30f8b497315a6467d86c82f6cc8acaa9db61 (patch) | |
| tree | ce4c4ac4b12941cf601d47cadb06b0ef9c7d5ce1 | |
| parent | 1344b7ea172b4911a8ee8a6ff26c5bc6b5abb302 (diff) | |
NFS: Fix up nfs_page_group_covers_page()
Fix up the test in nfs_page_group_covers_page(). The simplest implementation
is to check that we have a set of intersecting or contiguous subrequests
that connect page offset 0 to nfs_page_length(req->wb_page).
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
| -rw-r--r-- | fs/nfs/write.c | 18 |
1 files changed, 6 insertions, 12 deletions
diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 0f418d825185..759e37d26acf 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -243,9 +243,6 @@ nfs_page_group_search_locked(struct nfs_page *head, unsigned int page_offset) { struct nfs_page *req; - WARN_ON_ONCE(head != head->wb_head); - WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &head->wb_head->wb_flags)); - req = head; do { if (page_offset >= req->wb_pgbase && @@ -273,18 +270,15 @@ static bool nfs_page_group_covers_page(struct nfs_page *req) nfs_page_group_lock(req); - do { + for (;;) { tmp = nfs_page_group_search_locked(req->wb_head, pos); - if (tmp) { - /* no way this should happen */ - WARN_ON_ONCE(tmp->wb_pgbase != pos); - pos += tmp->wb_bytes - (pos - tmp->wb_pgbase); - } - } while (tmp && pos < len); + if (!tmp) + break; + pos = tmp->wb_pgbase + tmp->wb_bytes; + } nfs_page_group_unlock(req); - WARN_ON_ONCE(pos > len); - return pos == len; + return pos >= len; } /* We can set the PG_uptodate flag if we see that a write request |