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authorTrond Myklebust <Trond.Myklebust@netapp.com>2006-03-20 13:44:51 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2006-03-20 13:44:51 -0500
commitc42de9dd67250fe984e0e31c9b542d721af6454b (patch)
treea4079b25a044f7124837f572e5342dc7614ca75d
parent7d46a49f512e8d10b23353781a8ba85edd4fa640 (diff)
NFS: Fix a race in nfs_sync_inode()
Kudos to Neil Brown for spotting the problem: "in nfs_sync_inode, there is effectively the sequence: nfs_wait_on_requests nfs_flush_inode nfs_commit_inode This seems a bit racy to me as if the only requests are on the ->commit list, and nfs_commit_inode is called separately after nfs_wait_on_requests completes, and before nfs_commit_inode start (say: by nfs_write_inode) then none of these function will return >0, yet there will be some pending request that aren't waited for." The solution is to search for requests to wait upon, search for dirty requests, and search for uncommitted requests while holding the nfsi->req_lock The patch also cleans up nfs_sync_inode(), getting rid of the redundant FLUSH_WAIT flag. It turns out that we were always setting it. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
-rw-r--r--fs/nfs/inode.c4
-rw-r--r--fs/nfs/write.c72
-rw-r--r--include/linux/nfs_fs.h10
3 files changed, 56 insertions, 30 deletions
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index a0cda53461b..60aac58270a 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -137,7 +137,7 @@ nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
static int
nfs_write_inode(struct inode *inode, int sync)
{
- int flags = sync ? FLUSH_WAIT : 0;
+ int flags = sync ? FLUSH_SYNC : 0;
int ret;
ret = nfs_commit_inode(inode, flags);
@@ -1051,7 +1051,7 @@ int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
int err;
/* Flush out writes to the server in order to update c/mtime */
- nfs_sync_inode(inode, 0, 0, FLUSH_WAIT|FLUSH_NOCOMMIT);
+ nfs_sync_inode_wait(inode, 0, 0, FLUSH_NOCOMMIT);
/*
* We may force a getattr if the user cares about atime.
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 2beb1268bb1..3f5225404c9 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -539,8 +539,7 @@ nfs_mark_request_commit(struct nfs_page *req)
*
* Interruptible by signals only if mounted with intr flag.
*/
-static int
-nfs_wait_on_requests(struct inode *inode, unsigned long idx_start, unsigned int npages)
+static int nfs_wait_on_requests_locked(struct inode *inode, unsigned long idx_start, unsigned int npages)
{
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs_page *req;
@@ -553,7 +552,6 @@ nfs_wait_on_requests(struct inode *inode, unsigned long idx_start, unsigned int
else
idx_end = idx_start + npages - 1;
- spin_lock(&nfsi->req_lock);
next = idx_start;
while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_WRITEBACK)) {
if (req->wb_index > idx_end)
@@ -566,15 +564,25 @@ nfs_wait_on_requests(struct inode *inode, unsigned long idx_start, unsigned int
spin_unlock(&nfsi->req_lock);
error = nfs_wait_on_request(req);
nfs_release_request(req);
+ spin_lock(&nfsi->req_lock);
if (error < 0)
return error;
- spin_lock(&nfsi->req_lock);
res++;
}
- spin_unlock(&nfsi->req_lock);
return res;
}
+static int nfs_wait_on_requests(struct inode *inode, unsigned long idx_start, unsigned int npages)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+ int ret;
+
+ spin_lock(&nfsi->req_lock);
+ ret = nfs_wait_on_requests_locked(inode, idx_start, npages);
+ spin_unlock(&nfsi->req_lock);
+ return ret;
+}
+
/*
* nfs_scan_dirty - Scan an inode for dirty requests
* @inode: NFS inode to scan
@@ -626,6 +634,11 @@ nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_st
}
return res;
}
+#else
+static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages)
+{
+ return 0;
+}
#endif
static int nfs_wait_on_write_congestion(struct address_space *mapping, int intr)
@@ -1421,6 +1434,11 @@ static const struct rpc_call_ops nfs_commit_ops = {
.rpc_call_done = nfs_commit_done,
.rpc_release = nfs_commit_release,
};
+#else
+static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how)
+{
+ return 0;
+}
#endif
static int nfs_flush_inode(struct inode *inode, unsigned long idx_start,
@@ -1460,28 +1478,38 @@ int nfs_commit_inode(struct inode *inode, int how)
}
#endif
-int nfs_sync_inode(struct inode *inode, unsigned long idx_start,
- unsigned int npages, int how)
+int nfs_sync_inode_wait(struct inode *inode, unsigned long idx_start,
+ unsigned int npages, int how)
{
+ struct nfs_inode *nfsi = NFS_I(inode);
+ LIST_HEAD(head);
int nocommit = how & FLUSH_NOCOMMIT;
- int wait = how & FLUSH_WAIT;
- int error;
-
- how &= ~(FLUSH_WAIT|FLUSH_NOCOMMIT);
+ int pages, ret;
+ how &= ~FLUSH_NOCOMMIT;
+ spin_lock(&nfsi->req_lock);
do {
- if (wait) {
- error = nfs_wait_on_requests(inode, idx_start, npages);
- if (error != 0)
- continue;
- }
- error = nfs_flush_inode(inode, idx_start, npages, how);
- if (error != 0)
+ ret = nfs_wait_on_requests_locked(inode, idx_start, npages);
+ if (ret != 0)
continue;
- if (!nocommit)
- error = nfs_commit_inode(inode, how);
- } while (error > 0);
- return error;
+ pages = nfs_scan_dirty(inode, &head, idx_start, npages);
+ if (pages != 0) {
+ spin_unlock(&nfsi->req_lock);
+ ret = nfs_flush_list(inode, &head, pages, how);
+ spin_lock(&nfsi->req_lock);
+ continue;
+ }
+ if (nocommit)
+ break;
+ pages = nfs_scan_commit(inode, &head, 0, 0);
+ if (pages == 0)
+ break;
+ spin_unlock(&nfsi->req_lock);
+ ret = nfs_commit_list(inode, &head, how);
+ spin_lock(&nfsi->req_lock);
+ } while (ret >= 0);
+ spin_unlock(&nfsi->req_lock);
+ return ret;
}
int nfs_init_writepagecache(void)
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 55de0770df4..cbebd7d1b9e 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -56,9 +56,7 @@
* When flushing a cluster of dirty pages, there can be different
* strategies:
*/
-#define FLUSH_AGING 0 /* only flush old buffers */
#define FLUSH_SYNC 1 /* file being synced, or contention */
-#define FLUSH_WAIT 2 /* wait for completion */
#define FLUSH_STABLE 4 /* commit to stable storage */
#define FLUSH_LOWPRI 8 /* low priority background flush */
#define FLUSH_HIGHPRI 16 /* high priority memory reclaim flush */
@@ -419,7 +417,7 @@ void nfs_commit_free(struct nfs_write_data *p);
* Try to write back everything synchronously (but check the
* return value!)
*/
-extern int nfs_sync_inode(struct inode *, unsigned long, unsigned int, int);
+extern int nfs_sync_inode_wait(struct inode *, unsigned long, unsigned int, int);
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
extern int nfs_commit_inode(struct inode *, int);
extern void nfs_commit_release(void *wdata);
@@ -440,7 +438,7 @@ nfs_have_writebacks(struct inode *inode)
static inline int
nfs_wb_all(struct inode *inode)
{
- int error = nfs_sync_inode(inode, 0, 0, FLUSH_WAIT);
+ int error = nfs_sync_inode_wait(inode, 0, 0, 0);
return (error < 0) ? error : 0;
}
@@ -449,8 +447,8 @@ nfs_wb_all(struct inode *inode)
*/
static inline int nfs_wb_page_priority(struct inode *inode, struct page* page, int how)
{
- int error = nfs_sync_inode(inode, page->index, 1,
- how | FLUSH_WAIT | FLUSH_STABLE);
+ int error = nfs_sync_inode_wait(inode, page->index, 1,
+ how | FLUSH_STABLE);
return (error < 0) ? error : 0;
}