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authorTrond Myklebust <Trond.Myklebust@netapp.com>2012-03-16 17:52:45 (GMT)
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-03-17 15:17:42 (GMT)
commit9390f42546339cf111edd23c16d6cf74ca41974c (patch)
treef281aa1e7bed7fbf41c441eab605d6d7a1a9050b
parent8dd3775889345850ecddd689b5c200cdd91bd8c9 (diff)
downloadlinux-9390f42546339cf111edd23c16d6cf74ca41974c.tar.xz
NFSv4.1: Fix a few issues in filelayout_commit_pagelist
- Fix a race in which NFS_I(inode)->commits_outstanding could potentially go to zero (triggering a call to nfs_commit_clear_lock()) before we're done sending out all the commit RPC calls. - If nfs_commitdata_alloc fails, there is no reason why we shouldn't try to send off all the commits-to-ds. - Simplify the error handling. - Change pnfs_commit_list() to always return either PNFS_ATTEMPTED or PNFS_NOT_ATTEMPTED. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: Fred Isaman <iisaman@netapp.com>
-rw-r--r--fs/nfs/nfs4filelayout.c47
1 files changed, 24 insertions, 23 deletions
diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index c24e077..e0bdbf4 100644
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -980,12 +980,14 @@ out_done:
return rv;
}
-static int alloc_ds_commits(struct inode *inode, struct list_head *list)
+static unsigned int
+alloc_ds_commits(struct inode *inode, struct list_head *list)
{
struct pnfs_layout_segment *lseg;
struct nfs4_filelayout_segment *fl;
struct nfs_write_data *data;
int i, j;
+ unsigned int nreq = 0;
/* Won't need this when non-whole file layout segments are supported
* instead we will use a pnfs_layout_hdr structure */
@@ -998,15 +1000,14 @@ static int alloc_ds_commits(struct inode *inode, struct list_head *list)
continue;
data = nfs_commitdata_alloc();
if (!data)
- goto out_bad;
+ break;
data->ds_commit_index = i;
data->lseg = lseg;
list_add(&data->pages, list);
+ nreq++;
}
- put_lseg(lseg);
- return 0;
-out_bad:
+ /* Clean up on error */
for (j = i; j < fl->number_of_buckets; j++) {
if (list_empty(&fl->commit_buckets[i].committing))
continue;
@@ -1015,7 +1016,7 @@ out_bad:
}
put_lseg(lseg);
/* Caller will clean up entries put on list */
- return -ENOMEM;
+ return nreq;
}
/* This follows nfs_commit_list pretty closely */
@@ -1025,21 +1026,29 @@ filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
{
struct nfs_write_data *data, *tmp;
LIST_HEAD(list);
+ unsigned int nreq = 0;
if (!list_empty(mds_pages)) {
data = nfs_commitdata_alloc();
- if (!data)
- goto out_bad;
- data->lseg = NULL;
- list_add(&data->pages, &list);
+ if (data != NULL) {
+ data->lseg = NULL;
+ list_add(&data->pages, &list);
+ nreq++;
+ } else
+ nfs_retry_commit(mds_pages, NULL);
}
- if (alloc_ds_commits(inode, &list))
- goto out_bad;
+ nreq += alloc_ds_commits(inode, &list);
+
+ if (nreq == 0) {
+ nfs_commit_clear_lock(NFS_I(inode));
+ goto out;
+ }
+
+ atomic_add(nreq, &NFS_I(inode)->commits_outstanding);
list_for_each_entry_safe(data, tmp, &list, pages) {
list_del_init(&data->pages);
- atomic_inc(&NFS_I(inode)->commits_outstanding);
if (!data->lseg) {
nfs_init_commit(data, mds_pages, NULL);
nfs_initiate_commit(data, NFS_CLIENT(inode),
@@ -1049,16 +1058,8 @@ filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
filelayout_initiate_commit(data, how);
}
}
- return 0;
- out_bad:
- list_for_each_entry_safe(data, tmp, &list, pages) {
- nfs_retry_commit(&data->pages, data->lseg);
- list_del_init(&data->pages);
- nfs_commit_free(data);
- }
- nfs_retry_commit(mds_pages, NULL);
- nfs_commit_clear_lock(NFS_I(inode));
- return -ENOMEM;
+out:
+ return PNFS_ATTEMPTED;
}
static void