From 59844a9bd73e084b0ffefc0e13226098e28c71ad Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Wed, 26 May 2010 08:42:24 -0400 Subject: NFS: Fix a lock imbalance typo in nfs_access_cache_shrinker Commit 9c7e7e23371e629dbb3b341610a418cdf1c19d91 (NFS: Don't call iput() in nfs_access_cache_shrinker) unintentionally removed the spin unlock for the inode->i_lock. Reported-by: David Howells Signed-off-by: Trond Myklebust --- fs/nfs/dir.c | 1 + 1 file changed, 1 insertion(+) (limited to 'fs') diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index ee9a179ebdf3..db64854b7b09 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -1741,6 +1741,7 @@ remove_lru_entry: clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); smp_mb__after_clear_bit(); } + spin_unlock(&inode->i_lock); } spin_unlock(&nfs_access_lru_lock); nfs_access_free_list(&head); -- cgit v1.2.3 From c5efa5fc91f1f6d1d47e65f39e7ec6d1157c777d Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Wed, 26 May 2010 08:42:11 -0400 Subject: NFS: Ensure that we mark the inode as dirty if we exit early from commit If we exit from nfs_commit_inode() without ensuring that the COMMIT rpc call has been completed, we must re-mark the inode as dirty. Otherwise, future calls to sync_inode() with the WB_SYNC_ALL flag set will fail to ensure that the data is on the disk. Signed-off-by: Trond Myklebust --- fs/nfs/write.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 3aea3ca98ab7..b8a6d7af2a1d 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -1386,7 +1386,7 @@ static int nfs_commit_inode(struct inode *inode, int how) int res = 0; if (!nfs_commit_set_lock(NFS_I(inode), may_wait)) - goto out; + goto out_mark_dirty; spin_lock(&inode->i_lock); res = nfs_scan_commit(inode, &head, 0, 0); spin_unlock(&inode->i_lock); @@ -1398,9 +1398,18 @@ static int nfs_commit_inode(struct inode *inode, int how) wait_on_bit(&NFS_I(inode)->flags, NFS_INO_COMMIT, nfs_wait_bit_killable, TASK_KILLABLE); + else + goto out_mark_dirty; } else nfs_commit_clear_lock(NFS_I(inode)); -out: + return res; + /* Note: If we exit without ensuring that the commit is complete, + * we must mark the inode as dirty. Otherwise, future calls to + * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure + * that the data is on the disk. + */ +out_mark_dirty: + __mark_inode_dirty(inode, I_DIRTY_DATASYNC); return res; } -- cgit v1.2.3 From 0522f6adedd2736cbca3c0e16ca51df668993eee Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Wed, 26 May 2010 08:42:24 -0400 Subject: NFS: Fix another nfs_wb_page() deadlock J.R. Okajima reports that the call to sync_inode() in nfs_wb_page() can deadlock with other writeback flush calls. It boils down to the fact that we cannot ever call writeback_single_inode() while holding a page lock (even if we do set nr_to_write to zero) since another process may already be waiting in the call to do_writepages(), and so will deny us the I_SYNC lock. Signed-off-by: Trond Myklebust --- fs/nfs/write.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/nfs/write.c b/fs/nfs/write.c index b8a6d7af2a1d..91679e2631ee 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -1518,14 +1518,17 @@ int nfs_wb_page(struct inode *inode, struct page *page) }; int ret; - while(PagePrivate(page)) { + for (;;) { wait_on_page_writeback(page); if (clear_page_dirty_for_io(page)) { ret = nfs_writepage_locked(page, &wbc); if (ret < 0) goto out_error; + continue; } - ret = sync_inode(inode, &wbc); + if (!PagePrivate(page)) + break; + ret = nfs_commit_inode(inode, FLUSH_SYNC); if (ret < 0) goto out_error; } -- cgit v1.2.3