From: Jim Rees <rees@umich.edu>
To: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: linux-nfs@vger.kernel.org, peter honeyman <honey@citi.umich.edu>
Subject: [PATCH 2/5] pnfsblock: fix return code confusion
Date: Fri, 16 Sep 2011 12:14:16 -0400 [thread overview]
Message-ID: <1316189659-8799-3-git-send-email-rees@umich.edu> (raw)
In-Reply-To: <1316189659-8799-1-git-send-email-rees@umich.edu>
Always return PTR_ERR, not NULL, from nfs4_blk_get_deviceinfo and
nfs4_blk_decode_device.
Check for IS_ERR, not NULL, in bl_set_layoutdriver when calling
nfs4_blk_get_deviceinfo.
Signed-off-by: Jim Rees <rees@umich.edu>
Signed-off-by: Benny Halevy <bhalevy@tonian.com>
---
fs/nfs/blocklayout/blocklayout.c | 20 ++++++++++++--------
fs/nfs/blocklayout/blocklayoutdev.c | 13 ++++++++-----
2 files changed, 20 insertions(+), 13 deletions(-)
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index 9561c8f..d2432f0 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -805,7 +805,7 @@ nfs4_blk_get_deviceinfo(struct nfs_server *server, const struct nfs_fh *fh,
struct nfs4_deviceid *d_id)
{
struct pnfs_device *dev;
- struct pnfs_block_dev *rv = NULL;
+ struct pnfs_block_dev *rv;
u32 max_resp_sz;
int max_pages;
struct page **pages = NULL;
@@ -823,18 +823,20 @@ nfs4_blk_get_deviceinfo(struct nfs_server *server, const struct nfs_fh *fh,
dev = kmalloc(sizeof(*dev), GFP_NOFS);
if (!dev) {
dprintk("%s kmalloc failed\n", __func__);
- return NULL;
+ return ERR_PTR(-ENOMEM);
}
pages = kzalloc(max_pages * sizeof(struct page *), GFP_NOFS);
if (pages == NULL) {
kfree(dev);
- return NULL;
+ return ERR_PTR(-ENOMEM);
}
for (i = 0; i < max_pages; i++) {
pages[i] = alloc_page(GFP_NOFS);
- if (!pages[i])
+ if (!pages[i]) {
+ rv = ERR_PTR(-ENOMEM);
goto out_free;
+ }
}
memcpy(&dev->dev_id, d_id, sizeof(*d_id));
@@ -847,8 +849,10 @@ nfs4_blk_get_deviceinfo(struct nfs_server *server, const struct nfs_fh *fh,
dprintk("%s: dev_id: %s\n", __func__, dev->dev_id.data);
rc = nfs4_proc_getdeviceinfo(server, dev);
dprintk("%s getdevice info returns %d\n", __func__, rc);
- if (rc)
+ if (rc) {
+ rv = ERR_PTR(rc);
goto out_free;
+ }
rv = nfs4_blk_decode_device(server, dev);
out_free:
@@ -866,7 +870,7 @@ bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh)
struct pnfs_devicelist *dlist = NULL;
struct pnfs_block_dev *bdev;
LIST_HEAD(block_disklist);
- int status = 0, i;
+ int status, i;
dprintk("%s enter\n", __func__);
@@ -898,8 +902,8 @@ bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh)
for (i = 0; i < dlist->num_devs; i++) {
bdev = nfs4_blk_get_deviceinfo(server, fh,
&dlist->dev_id[i]);
- if (!bdev) {
- status = -ENODEV;
+ if (IS_ERR(bdev)) {
+ status = PTR_ERR(bdev);
goto out_error;
}
spin_lock(&b_mt_id->bm_lock);
diff --git a/fs/nfs/blocklayout/blocklayoutdev.c b/fs/nfs/blocklayout/blocklayoutdev.c
index a83b393..0b1fb0e 100644
--- a/fs/nfs/blocklayout/blocklayoutdev.c
+++ b/fs/nfs/blocklayout/blocklayoutdev.c
@@ -131,7 +131,7 @@ struct pnfs_block_dev *
nfs4_blk_decode_device(struct nfs_server *server,
struct pnfs_device *dev)
{
- struct pnfs_block_dev *rv = NULL;
+ struct pnfs_block_dev *rv;
struct block_device *bd = NULL;
struct rpc_pipe_msg msg;
struct bl_msg_hdr bl_msg = {
@@ -141,7 +141,7 @@ nfs4_blk_decode_device(struct nfs_server *server,
uint8_t *dataptr;
DECLARE_WAITQUEUE(wq, current);
struct bl_dev_msg *reply = &bl_mount_reply;
- int offset, len, i;
+ int offset, len, i, rc;
dprintk("%s CREATING PIPEFS MESSAGE\n", __func__);
dprintk("%s: deviceid: %s, mincount: %d\n", __func__, dev->dev_id.data,
@@ -168,8 +168,10 @@ nfs4_blk_decode_device(struct nfs_server *server,
dprintk("%s CALLING USERSPACE DAEMON\n", __func__);
add_wait_queue(&bl_wq, &wq);
- if (rpc_queue_upcall(bl_device_pipe->d_inode, &msg) < 0) {
+ rc = rpc_queue_upcall(bl_device_pipe->d_inode, &msg);
+ if (rc < 0) {
remove_wait_queue(&bl_wq, &wq);
+ rv = ERR_PTR(rc);
goto out;
}
@@ -187,8 +189,9 @@ nfs4_blk_decode_device(struct nfs_server *server,
bd = nfs4_blkdev_get(MKDEV(reply->major, reply->minor));
if (IS_ERR(bd)) {
- dprintk("%s failed to open device : %ld\n",
- __func__, PTR_ERR(bd));
+ rc = PTR_ERR(bd);
+ dprintk("%s failed to open device : %d\n", __func__, rc);
+ rv = ERR_PTR(rc);
goto out;
}
--
1.7.6
next prev parent reply other threads:[~2011-09-16 16:14 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-16 16:14 [PATCH 0/5] pnfsblock: Bug fixes for 3.1 Jim Rees
2011-09-16 16:14 ` [PATCH 1/5] pnfsblock: fix size of upcall message Jim Rees
2011-09-16 16:14 ` Jim Rees [this message]
2011-09-16 16:14 ` [PATCH 3/5] pnfsblock: fix NULL pointer dereference Jim Rees
2011-09-16 16:14 ` [PATCH 4/5] pnfsblock: fix writeback deadlock Jim Rees
2011-09-16 16:14 ` [PATCH 5/5] pnfsblock: add missing rpc_put_mount and path_put Jim Rees
2011-09-16 16:37 ` Peng Tao
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