diff options
| author | Trond Myklebust | 2009-12-10 09:05:55 -0500 |
|---|---|---|
| committer | Trond Myklebust | 2009-12-10 09:05:55 -0500 |
| commit | 190f38e5cedc910940b1da9015f00458c18f97b4 (patch) | |
| tree | 3b13c1cd5c536b6187b3196610b97e70a0ba0372 /fs/nfs | |
| parent | 053e324f67b9921fe7de0c4cbc720d29cb4bf207 (diff) | |
NFS: Fix nfs_migrate_page()
The call to migrate_page() will cause the page->private field to be
cleared.
Also fix up the locking around the page->private transfer, so that we ensure
that calls to nfs_page_find_request() don't end up racing.
Finally, fix up a double free bug: nfs_unlock_request() already calls
nfs_release_request() for us...
Reported-by: Wu Fengguang <fengguang.wu@intel.com>
Tested-by: Andi Kleen <andi@firstfloor.org>
Cc: stable@kernel.org
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs')
| -rw-r--r-- | fs/nfs/write.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/nfs/write.c b/fs/nfs/write.c index a28123be08a6..6d40a538e3db 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -1611,15 +1611,16 @@ int nfs_migrate_page(struct address_space *mapping, struct page *newpage, if (ret) goto out_unlock; page_cache_get(newpage); + spin_lock(&mapping->host->i_lock); req->wb_page = newpage; SetPagePrivate(newpage); - set_page_private(newpage, page_private(page)); + set_page_private(newpage, (unsigned long)req); ClearPagePrivate(page); set_page_private(page, 0); + spin_unlock(&mapping->host->i_lock); page_cache_release(page); out_unlock: nfs_clear_page_tag_locked(req); - nfs_release_request(req); out: return ret; } |