diff options
| -rw-r--r-- | fs/nfs/file.c | 26 | ||||
| -rw-r--r-- | fs/nfs/write.c | 2 |
2 files changed, 18 insertions, 10 deletions
diff --git a/fs/nfs/file.c b/fs/nfs/file.c index 23e5f0ea5c83..325df0aeab05 100644 --- a/fs/nfs/file.c +++ b/fs/nfs/file.c @@ -475,17 +475,23 @@ static int nfs_release_page(struct page *page, gfp_t gfp) dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page); - /* Only do I/O if gfp is a superset of GFP_KERNEL, and we're not - * doing this memory reclaim for a fs-related allocation. + /* Always try to initiate a 'commit' if relevant, but only + * wait for it if __GFP_WAIT is set and the calling process is + * allowed to block. Even then, only wait 1 second. + * Waiting indefinitely can cause deadlocks when the NFS + * server is on this machine, and there is no particular need + * to wait extensively here. A short wait has the benefit + * that someone else can worry about the freezer. */ - if (mapping && (gfp & GFP_KERNEL) == GFP_KERNEL && - !(current->flags & PF_FSTRANS)) { - int how = FLUSH_SYNC; - - /* Don't let kswapd deadlock waiting for OOM RPC calls */ - if (current_is_kswapd()) - how = 0; - nfs_commit_inode(mapping->host, how); + if (mapping) { + struct nfs_server *nfss = NFS_SERVER(mapping->host); + nfs_commit_inode(mapping->host, 0); + if ((gfp & __GFP_WAIT) && + !current_is_kswapd() && + !(current->flags & PF_FSTRANS)) { + wait_on_page_bit_killable_timeout(page, PG_private, + HZ); + } } /* If PagePrivate() is set, then the page is not freeable */ if (PagePrivate(page)) diff --git a/fs/nfs/write.c b/fs/nfs/write.c index a623b00530c3..c063a4e70354 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -705,6 +705,8 @@ static void nfs_inode_remove_request(struct nfs_page *req) if (likely(!PageSwapCache(head->wb_page))) { set_page_private(head->wb_page, 0); ClearPagePrivate(head->wb_page); + smp_mb__after_atomic(); + wake_up_page(head->wb_page, PG_private); clear_bit(PG_MAPPED, &head->wb_flags); } nfsi->npages--; |