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authorTrond Myklebust <Trond.Myklebust@netapp.com>2007-05-20 10:18:27 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2007-05-24 10:44:20 -0400
commit7fe7f8487ae742239dd8c66596e2311c30d057d1 (patch)
treec506bd7dcacc9d5b25b3295bd1f327e534532c54 /include/linux
parent585a2858b970cb6e2e5ca4877eefd18b4dba8ed4 (diff)
NFS: Avoid a deadlock situation on write
When processes are allowed to attempt to lock a non-contiguous range of nfs write requests, it is possible for generic_writepages to 'wrap round' the address space, and call writepage() on a request that is already locked by the same process. We avoid the deadlock by checking if the page index is contiguous with the list of nfs write requests that is already held in our nfs_pageio_descriptor prior to attempting to lock a new request. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/nfs_page.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h
index 41afab6b5f0..bd193af8016 100644
--- a/include/linux/nfs_page.h
+++ b/include/linux/nfs_page.h
@@ -81,6 +81,7 @@ extern void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
extern int nfs_pageio_add_request(struct nfs_pageio_descriptor *,
struct nfs_page *);
extern void nfs_pageio_complete(struct nfs_pageio_descriptor *desc);
+extern void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *, pgoff_t);
extern int nfs_wait_on_request(struct nfs_page *);
extern void nfs_unlock_request(struct nfs_page *req);
extern int nfs_set_page_writeback_locked(struct nfs_page *req);