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authorEric Van Hensbergen <ericvh@opteron.9grid.us>2008-05-08 20:26:37 -0500
committerEric Van Hensbergen <ericvh@opteron.9grid.us>2008-05-14 19:23:27 -0500
commit887b3ece65be7b643dfdae0d433c91a26a3f437d (patch)
tree471889dcdd3f7eb6762d863fef236014c63a0301
parent332c421e67045343de74e644cdf389f559f0d83f (diff)
downloadlinux-2.6.38-lt-ux500-887b3ece65be7b643dfdae0d433c91a26a3f437d.tar.gz
9p: fix error path during early mount
There was some cleanup issues during early mount which would trigger a kernel bug for certain types of failure. This patch reorganizes the cleanup to get rid of the bad behavior. This also merges the 9pnet and 9pnet_fd modules for the purpose of configuration and initialization. Keeping the fd transport separate from the core 9pnet code seemed like a good idea at the time, but in practice has caused more harm and confusion than good. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
-rw-r--r--fs/9p/v9fs.c13
-rw-r--r--fs/9p/vfs_super.c34
-rw-r--r--include/net/9p/9p.h1
-rw-r--r--include/net/9p/transport.h1
-rw-r--r--net/9p/Kconfig10
-rw-r--r--net/9p/Makefile3
-rw-r--r--net/9p/mod.c1
-rw-r--r--net/9p/trans_fd.c29
8 files changed, 47 insertions, 45 deletions
diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index 5c1ccaf0416..047c791427a 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -206,12 +206,14 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
v9ses->uid = ~0;
v9ses->dfltuid = V9FS_DEFUID;
v9ses->dfltgid = V9FS_DEFGID;
- v9ses->options = kstrdup(data, GFP_KERNEL);
- if (!v9ses->options) {
- P9_DPRINTK(P9_DEBUG_ERROR,
+ if (data) {
+ v9ses->options = kstrdup(data, GFP_KERNEL);
+ if (!v9ses->options) {
+ P9_DPRINTK(P9_DEBUG_ERROR,
"failed to allocate copy of option string\n");
- retval = -ENOMEM;
- goto error;
+ retval = -ENOMEM;
+ goto error;
+ }
}
rc = v9fs_parse_options(v9ses);
@@ -260,7 +262,6 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
return fid;
error:
- v9fs_session_close(v9ses);
return ERR_PTR(retval);
}
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index ba10f172626..bf59c396049 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -128,29 +128,26 @@ static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
fid = v9fs_session_init(v9ses, dev_name, data);
if (IS_ERR(fid)) {
retval = PTR_ERR(fid);
- fid = NULL;
- kfree(v9ses);
- v9ses = NULL;
- goto error;
+ goto close_session;
}
st = p9_client_stat(fid);
if (IS_ERR(st)) {
retval = PTR_ERR(st);
- goto error;
+ goto clunk_fid;
}
sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
if (IS_ERR(sb)) {
retval = PTR_ERR(sb);
- goto error;
+ goto free_stat;
}
v9fs_fill_super(sb, v9ses, flags);
inode = v9fs_get_inode(sb, S_IFDIR | mode);
if (IS_ERR(inode)) {
retval = PTR_ERR(inode);
- goto error;
+ goto release_sb;
}
inode->i_uid = uid;
@@ -159,7 +156,7 @@ static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
root = d_alloc_root(inode);
if (!root) {
retval = -ENOMEM;
- goto error;
+ goto release_sb;
}
sb->s_root = root;
@@ -170,21 +167,22 @@ static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
return simple_set_mnt(mnt, sb);
-error:
- kfree(st);
- if (fid)
- p9_client_clunk(fid);
-
- if (v9ses) {
- v9fs_session_close(v9ses);
- kfree(v9ses);
- }
-
+release_sb:
if (sb) {
up_write(&sb->s_umount);
deactivate_super(sb);
}
+free_stat:
+ kfree(st);
+
+clunk_fid:
+ p9_client_clunk(fid);
+
+close_session:
+ v9fs_session_close(v9ses);
+ kfree(v9ses);
+
return retval;
}
diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h
index 7bfb2f2e423..b3d3e27c629 100644
--- a/include/net/9p/9p.h
+++ b/include/net/9p/9p.h
@@ -595,4 +595,5 @@ int p9_idpool_check(int id, struct p9_idpool *p);
int p9_error_init(void);
int p9_errstr2errno(char *, int);
+int p9_trans_fd_init(void);
#endif /* NET_9P_H */
diff --git a/include/net/9p/transport.h b/include/net/9p/transport.h
index 240e0de888c..0db3a4038dc 100644
--- a/include/net/9p/transport.h
+++ b/include/net/9p/transport.h
@@ -96,5 +96,4 @@ struct p9_trans_module {
void v9fs_register_trans(struct p9_trans_module *m);
struct p9_trans_module *v9fs_match_trans(const substring_t *name);
struct p9_trans_module *v9fs_default_trans(void);
-
#endif /* NET_9P_TRANSPORT_H */
diff --git a/net/9p/Kconfig b/net/9p/Kconfig
index bafc50c9e6f..ff34c5acc13 100644
--- a/net/9p/Kconfig
+++ b/net/9p/Kconfig
@@ -13,16 +13,6 @@ menuconfig NET_9P
If unsure, say N.
-config NET_9P_FD
- depends on NET_9P
- default y if NET_9P
- tristate "9P File Descriptor Transports (Experimental)"
- help
- This builds support for file descriptor transports for 9p
- which includes support for TCP/IP, named pipes, or passed
- file descriptors. TCP/IP is the default transport for 9p,
- so if you are going to use 9p, you'll likely want this.
-
config NET_9P_VIRTIO
depends on NET_9P && EXPERIMENTAL && VIRTIO
tristate "9P Virtio Transport (Experimental)"
diff --git a/net/9p/Makefile b/net/9p/Makefile
index 8a105110189..519219480db 100644
--- a/net/9p/Makefile
+++ b/net/9p/Makefile
@@ -1,5 +1,4 @@
obj-$(CONFIG_NET_9P) := 9pnet.o
-obj-$(CONFIG_NET_9P_FD) += 9pnet_fd.o
obj-$(CONFIG_NET_9P_VIRTIO) += 9pnet_virtio.o
9pnet-objs := \
@@ -9,8 +8,6 @@ obj-$(CONFIG_NET_9P_VIRTIO) += 9pnet_virtio.o
error.o \
fcprint.o \
util.o \
-
-9pnet_fd-objs := \
trans_fd.o \
9pnet_virtio-objs := \
diff --git a/net/9p/mod.c b/net/9p/mod.c
index c6d9695949e..bdee1fb7cc6 100644
--- a/net/9p/mod.c
+++ b/net/9p/mod.c
@@ -107,6 +107,7 @@ static int __init init_p9(void)
p9_error_init();
printk(KERN_INFO "Installing 9P2000 support\n");
+ p9_trans_fd_init();
return ret;
}
diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index 97b103b7049..4507f744f44 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -1433,6 +1433,23 @@ static void p9_fd_close(struct p9_trans *trans)
kfree(ts);
}
+/*
+ * stolen from NFS - maybe should be made a generic function?
+ */
+static inline int valid_ipaddr4(const char *buf)
+{
+ int rc, count, in[4];
+
+ rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
+ if (rc != 4)
+ return -EINVAL;
+ for (count = 0; count < 4; count++) {
+ if (in[count] > 255)
+ return -EINVAL;
+ }
+ return 0;
+}
+
static struct p9_trans *
p9_trans_create_tcp(const char *addr, char *args, int msize, unsigned char dotu)
{
@@ -1447,6 +1464,9 @@ p9_trans_create_tcp(const char *addr, char *args, int msize, unsigned char dotu)
if (err < 0)
return ERR_PTR(err);
+ if (valid_ipaddr4(addr) < 0)
+ return ERR_PTR(-EINVAL);
+
csocket = NULL;
trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL);
if (!trans)
@@ -1625,7 +1645,7 @@ static struct p9_trans_module p9_fd_trans = {
.create = p9_trans_create_fd,
};
-static int __init p9_trans_fd_init(void)
+int p9_trans_fd_init(void)
{
int ret = p9_mux_global_init();
if (ret) {
@@ -1639,9 +1659,4 @@ static int __init p9_trans_fd_init(void)
return 0;
}
-
-module_init(p9_trans_fd_init);
-
-MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
-MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
-MODULE_LICENSE("GPL");
+EXPORT_SYMBOL(p9_trans_fd_init);