leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs

Browse Source 
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs:
  9p: saving negative to unsigned char
  9p: return on mutex_lock_interruptible()
  9p: Creating files with names too long should fail with ENAMETOOLONG.
  9p: Make sure we are able to clunk the cached fid on umount
  9p: drop nlink remove
  fs/9p: Clunk the fid resulting from partial walk of the name
  9p: documentation update
  9p: Fix setting of protocol flags in v9fs_session_info structure.
This commit is contained in:
Linus Torvalds 2010-04-05 13:42:54 -07:00
commit 749d229761
9 changed files with 78 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
Documentation/filesystems/9p.txt
View File

@ -37,6 +37,15 @@ For Plan 9 From User Space applications (http://swtch.com/plan9)
mount -t 9p `namespace`/acme /mnt/9 -o trans=unix,uname=$USER
For server running on QEMU host with virtio transport:
mount -t 9p -o trans=virtio <mount_tag> /mnt/9
where mount_tag is the tag associated by the server to each of the exported
mount points. Each 9P export is seen by the client as a virtio device with an
associated "mount_tag" property. Available mount tags can be
seen by reading /sys/bus/virtio/drivers/9pnet_virtio/virtio<n>/mount_tag files.
OPTIONS
=======
@ -47,7 +56,7 @@ OPTIONS
fd - used passed file descriptors for connection
(see rfdno and wfdno)
virtio - connect to the next virtio channel available
(from lguest or KVM with trans_virtio module)
(from QEMU with trans_virtio module)
rdma - connect to a specified RDMA channel
uname=name user name to attempt mount as on the remote server. The
@ -85,7 +94,12 @@ OPTIONS
port=n port to connect to on the remote server
noextend force legacy mode (no 9p2000.u semantics)
noextend force legacy mode (no 9p2000.u or 9p2000.L semantics)
version=name Select 9P protocol version. Valid options are:
9p2000 - Legacy mode (same as noextend)
9p2000.u - Use 9P2000.u protocol
9p2000.L - Use 9P2000.L protocol
dfltuid attempt to mount as a particular uid

12
fs/9p/fid.c
View File

@ -111,7 +111,7 @@ struct p9_fid *v9fs_fid_lookup(struct dentry *dentry)
{
int i, n, l, clone, any, access;
u32 uid;
struct p9_fid *fid;
struct p9_fid *fid, *old_fid = NULL;
struct dentry *d, *ds;
struct v9fs_session_info *v9ses;
char **wnames, *uname;
@ -184,10 +184,18 @@ struct p9_fid *v9fs_fid_lookup(struct dentry *dentry)
l = min(n - i, P9_MAXWELEM);
fid = p9_client_walk(fid, l, &wnames[i], clone);
if (IS_ERR(fid)) {
if (old_fid) {
/*
* If we fail, clunk fid which are mapping
* to path component and not the last component
* of the path.
*/
p9_client_clunk(old_fid);
}
kfree(wnames);
return fid;
}
old_fid = fid;
i += l;
clone = 0;
}

21
fs/9p/v9fs.c
View File

@ -242,7 +242,7 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
list_add(&v9ses->slist, &v9fs_sessionlist);
spin_unlock(&v9fs_sessionlist_lock);
v9ses->flags = V9FS_PROTO_2000U | V9FS_ACCESS_USER;
v9ses->flags = V9FS_ACCESS_USER;
strcpy(v9ses->uname, V9FS_DEFUSER);
strcpy(v9ses->aname, V9FS_DEFANAME);
v9ses->uid = ~0;
@ -263,8 +263,10 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
goto error;
}
if (!p9_is_proto_dotu(v9ses->clnt))
v9ses->flags &= ~V9FS_PROTO_2000U;
if (p9_is_proto_dotl(v9ses->clnt))
v9ses->flags |= V9FS_PROTO_2000L;
else if (p9_is_proto_dotu(v9ses->clnt))
v9ses->flags |= V9FS_PROTO_2000U;
v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;
@ -341,6 +343,19 @@ void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
p9_client_disconnect(v9ses->clnt);
}
/**
* v9fs_session_begin_cancel - Begin terminate of a session
* @v9ses: session to terminate
*
* After this call we don't allow any request other than clunk.
*/
void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses)
{
P9_DPRINTK(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);
p9_client_begin_disconnect(v9ses->clnt);
}
extern int v9fs_error_init(void);
static struct kobject *v9fs_kobj;

1
fs/9p/v9fs.h
View File

@ -108,6 +108,7 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *,
char *);
void v9fs_session_close(struct v9fs_session_info *v9ses);
void v9fs_session_cancel(struct v9fs_session_info *v9ses);
void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses);
#define V9FS_MAGIC 0x01021997

2
fs/9p/vfs_dir.c
View File

@ -131,6 +131,8 @@ static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
rdir = (struct p9_rdir *) fid->rdir;
err = mutex_lock_interruptible(&rdir->mutex);
if (err)
return err;
while (err == 0) {
if (rdir->tail == rdir->head) {
err = v9fs_file_readn(filp, rdir->buf, NULL,

9
fs/9p/vfs_inode.c
View File

@ -432,6 +432,7 @@ error:
static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
{
int retval;
struct inode *file_inode;
struct v9fs_session_info *v9ses;
struct p9_fid *v9fid;
@ -445,7 +446,10 @@ static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
if (IS_ERR(v9fid))
return PTR_ERR(v9fid);
return p9_client_remove(v9fid);
retval = p9_client_remove(v9fid);
if (!retval)
drop_nlink(file_inode);
return retval;
}
static int
@ -657,6 +661,9 @@ static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
dir, dentry->d_name.name, dentry, nameidata);
if (dentry->d_name.len > NAME_MAX)
return ERR_PTR(-ENAMETOOLONG);
sb = dir->i_sb;
v9ses = v9fs_inode2v9ses(dir);
dfid = v9fs_fid_lookup(dentry->d_parent);

3
fs/9p/vfs_super.c
View File

@ -194,6 +194,7 @@ static void v9fs_kill_super(struct super_block *s)
kill_anon_super(s);
v9fs_session_cancel(v9ses);
v9fs_session_close(v9ses);
kfree(v9ses);
s->s_fs_info = NULL;
@ -206,7 +207,7 @@ v9fs_umount_begin(struct super_block *sb)
struct v9fs_session_info *v9ses;
v9ses = sb->s_fs_info;
v9fs_session_cancel(v9ses);
v9fs_session_begin_cancel(v9ses);
}
static const struct super_operations v9fs_super_ops = {

2
include/net/9p/client.h
View File

@ -54,6 +54,7 @@ enum p9_proto_versions{
enum p9_trans_status {
Connected,
BeginDisconnect,
Disconnected,
Hung,
};
@ -198,6 +199,7 @@ int p9_client_version(struct p9_client *);
struct p9_client *p9_client_create(const char *dev_name, char *options);
void p9_client_destroy(struct p9_client *clnt);
void p9_client_disconnect(struct p9_client *clnt);
void p9_client_begin_disconnect(struct p9_client *clnt);
struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
char *uname, u32 n_uname, char *aname);
struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname,

23
net/9p/client.c
View File

@ -72,9 +72,10 @@ inline int p9_is_proto_dotu(struct p9_client *clnt)
EXPORT_SYMBOL(p9_is_proto_dotu);
/* Interpret mount option for protocol version */
static unsigned char get_protocol_version(const substring_t *name)
static int get_protocol_version(const substring_t *name)
{
unsigned char version = -EINVAL;
int version = -EINVAL;
if (!strncmp("9p2000", name->from, name->to-name->from)) {
version = p9_proto_legacy;
P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n");
@ -534,7 +535,12 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
if (c->status != Connected)
/* we allow for any status other than disconnected */
if (c->status == Disconnected)
return ERR_PTR(-EIO);
/* if status is begin_disconnected we allow only clunk request */
if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
return ERR_PTR(-EIO);
if (signal_pending(current)) {
@ -800,8 +806,10 @@ void p9_client_destroy(struct p9_client *clnt)
v9fs_put_trans(clnt->trans_mod);
list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist)
list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
p9_fid_destroy(fid);
}
if (clnt->fidpool)
p9_idpool_destroy(clnt->fidpool);
@ -819,6 +827,13 @@ void p9_client_disconnect(struct p9_client *clnt)
}
EXPORT_SYMBOL(p9_client_disconnect);
void p9_client_begin_disconnect(struct p9_client *clnt)
{
P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
clnt->status = BeginDisconnect;
}
EXPORT_SYMBOL(p9_client_begin_disconnect);
struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
char *uname, u32 n_uname, char *aname)
{