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[PATCH] v9fs: add extension field to Tcreate

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Implement a new way of creating special files.  Instead of Tcreate+Twstat,
add one more field to Tcreate that contains special file description.

Signed-off-by: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Latchesar Ionkov 2006-03-25 03:07:26 -08:00 committed by Linus Torvalds
parent 5174fdab9f
commit 16cce6d27e
6 changed files with 50 additions and 51 deletions
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8
fs/9p/9p.c
View file

@ -334,8 +334,8 @@ v9fs_t_remove(struct v9fs_session_info *v9ses, u32 fid,
*/
int
v9fs_t_create(struct v9fs_session_info *v9ses, u32 fid, char *name,
u32 perm, u8 mode, struct v9fs_fcall **rcp)
v9fs_t_create(struct v9fs_session_info *v9ses, u32 fid, char *name, u32 perm,
u8 mode, char *extension, struct v9fs_fcall **rcp)
{
int ret;
struct v9fs_fcall *tc;
@ -343,7 +343,9 @@ v9fs_t_create(struct v9fs_session_info *v9ses, u32 fid, char *name,
dprintk(DEBUG_9P, "fid %d name '%s' perm %x mode %d\n",
fid, name, perm, mode);
tc = v9fs_create_tcreate(fid, name, perm, mode);
tc = v9fs_create_tcreate(fid, name, perm, mode, extension,
v9ses->extended);
if (!IS_ERR(tc)) {
ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
kfree(tc);

3
fs/9p/9p.h
View file

@ -235,6 +235,7 @@ struct Tcreate {
struct v9fs_str name;
u32 perm;
u8 mode;
struct v9fs_str extension;
};
struct Rcreate {
@ -364,7 +365,7 @@ int v9fs_t_remove(struct v9fs_session_info *v9ses, u32 fid,
struct v9fs_fcall **rcall);
int v9fs_t_create(struct v9fs_session_info *v9ses, u32 fid, char *name,
u32 perm, u8 mode, struct v9fs_fcall **rcall);
u32 perm, u8 mode, char *extension, struct v9fs_fcall **rcall);
int v9fs_t_read(struct v9fs_session_info *v9ses, u32 fid,
u64 offset, u32 count, struct v9fs_fcall **rcall);

8
fs/9p/conv.c
View file

@ -666,7 +666,8 @@ struct v9fs_fcall *v9fs_create_topen(u32 fid, u8 mode)
return fc;
}
struct v9fs_fcall *v9fs_create_tcreate(u32 fid, char *name, u32 perm, u8 mode)
struct v9fs_fcall *v9fs_create_tcreate(u32 fid, char *name, u32 perm, u8 mode,
char *extension, int extended)
{
int size;
struct v9fs_fcall *fc;
@ -674,6 +675,9 @@ struct v9fs_fcall *v9fs_create_tcreate(u32 fid, char *name, u32 perm, u8 mode)
struct cbuf *bufp = &buffer;
size = 4 + 2 + strlen(name) + 4 + 1; /* fid[4] name[s] perm[4] mode[1] */
if (extended && extension!=NULL)
size += 2 + strlen(extension); /* extension[s] */
fc = v9fs_create_common(bufp, size, TCREATE);
if (IS_ERR(fc))
goto error;
@ -682,6 +686,8 @@ struct v9fs_fcall *v9fs_create_tcreate(u32 fid, char *name, u32 perm, u8 mode)
v9fs_put_str(bufp, name, &fc->params.tcreate.name);
v9fs_put_int32(bufp, perm, &fc->params.tcreate.perm);
v9fs_put_int8(bufp, mode, &fc->params.tcreate.mode);
if (extended)
v9fs_put_str(bufp, extension, &fc->params.tcreate.extension);
if (buf_check_overflow(bufp)) {
kfree(fc);

3
fs/9p/conv.h
View file

@ -39,7 +39,8 @@ struct v9fs_fcall *v9fs_create_tflush(u16 oldtag);
struct v9fs_fcall *v9fs_create_twalk(u32 fid, u32 newfid, u16 nwname,
char **wnames);
struct v9fs_fcall *v9fs_create_topen(u32 fid, u8 mode);
struct v9fs_fcall *v9fs_create_tcreate(u32 fid, char *name, u32 perm, u8 mode);
struct v9fs_fcall *v9fs_create_tcreate(u32 fid, char *name, u32 perm, u8 mode,
char *extension, int extended);
struct v9fs_fcall *v9fs_create_tread(u32 fid, u64 offset, u32 count);
struct v9fs_fcall *v9fs_create_twrite(u32 fid, u64 offset, u32 count,
const char __user *data);

32
fs/9p/vfs_file.c
View file

@ -69,29 +69,30 @@ int v9fs_file_open(struct inode *inode, struct file *file)
fid = v9fs_get_idpool(&v9ses->fidpool);
if (fid < 0) {
eprintk(KERN_WARNING, "newfid fails!\n");
return -ENOSPC;
}
eprintk(KERN_WARNING, "newfid fails!\n");
return -ENOSPC;
}
err = v9fs_t_walk(v9ses, vfid->fid, fid, NULL, NULL);
if (err < 0) {
dprintk(DEBUG_ERROR, "rewalk didn't work\n");
dprintk(DEBUG_ERROR, "rewalk didn't work\n");
goto put_fid;
}
/* TODO: do special things for O_EXCL, O_NOFOLLOW, O_SYNC */
/* translate open mode appropriately */
omode = v9fs_uflags2omode(file->f_flags);
err = v9fs_t_open(v9ses, fid, omode, &fcall);
if (err < 0) {
PRINT_FCALL_ERROR("open failed", fcall);
goto clunk_fid;
}
vfid = kmalloc(sizeof(struct v9fs_fid), GFP_KERNEL);
if (vfid == NULL) {
dprintk(DEBUG_ERROR, "out of memory\n");
err = -ENOMEM;
goto clunk_fid;
}
/* TODO: do special things for O_EXCL, O_NOFOLLOW, O_SYNC */
/* translate open mode appropriately */
omode = v9fs_uflags2omode(file->f_flags);
err = v9fs_t_open(v9ses, fid, omode, &fcall);
if (err < 0) {
PRINT_FCALL_ERROR("open failed", fcall);
goto destroy_vfid;
}
file->private_data = vfid;
@ -106,15 +107,12 @@ int v9fs_file_open(struct inode *inode, struct file *file)
return 0;
destroy_vfid:
v9fs_fid_destroy(vfid);
clunk_fid:
v9fs_t_clunk(v9ses, fid);
put_fid:
v9fs_put_idpool(fid, &v9ses->fidpool);
kfree(fcall);
kfree(fcall);
return err;
}

47
fs/9p/vfs_inode.c
View file

@ -255,8 +255,8 @@ struct inode *v9fs_get_inode(struct super_block *sb, int mode)
}
static int
v9fs_create(struct v9fs_session_info *v9ses, u32 pfid, char *name,
u32 perm, u8 mode, u32 *fidp, struct v9fs_qid *qid, u32 *iounit)
v9fs_create(struct v9fs_session_info *v9ses, u32 pfid, char *name, u32 perm,
u8 mode, char *extension, u32 *fidp, struct v9fs_qid *qid, u32 *iounit)
{
u32 fid;
int err;
@ -271,14 +271,14 @@ v9fs_create(struct v9fs_session_info *v9ses, u32 pfid, char *name,
err = v9fs_t_walk(v9ses, pfid, fid, NULL, &fcall);
if (err < 0) {
PRINT_FCALL_ERROR("clone error", fcall);
goto error;
goto put_fid;
}
kfree(fcall);
err = v9fs_t_create(v9ses, fid, name, perm, mode, &fcall);
err = v9fs_t_create(v9ses, fid, name, perm, mode, extension, &fcall);
if (err < 0) {
PRINT_FCALL_ERROR("create fails", fcall);
goto error;
goto clunk_fid;
}
if (iounit)
@ -293,7 +293,11 @@ v9fs_create(struct v9fs_session_info *v9ses, u32 pfid, char *name,
kfree(fcall);
return 0;
error:
clunk_fid:
v9fs_t_clunk(v9ses, fid);
fid = V9FS_NOFID;
put_fid:
if (fid >= 0)
v9fs_put_idpool(fid, &v9ses->fidpool);
@ -474,7 +478,7 @@ v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
flags = O_RDWR;
err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
perm, v9fs_uflags2omode(flags), &fid, &qid, &iounit);
perm, v9fs_uflags2omode(flags), NULL, &fid, &qid, &iounit);
if (err)
goto error;
@ -550,7 +554,7 @@ static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
perm, V9FS_OREAD, &fid, NULL, NULL);
perm, V9FS_OREAD, NULL, &fid, NULL, NULL);
if (err) {
dprintk(DEBUG_ERROR, "create error %d\n", err);
@ -1008,11 +1012,13 @@ static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
/* copy extension buffer into buffer */
if (fcall->params.rstat.stat.extension.len < buflen)
buflen = fcall->params.rstat.stat.extension.len;
buflen = fcall->params.rstat.stat.extension.len + 1;
memcpy(buffer, fcall->params.rstat.stat.extension.str, buflen - 1);
memmove(buffer, fcall->params.rstat.stat.extension.str, buflen - 1);
buffer[buflen-1] = 0;
dprintk(DEBUG_ERROR, "%s -> %.*s (%s)\n", dentry->d_name.name, fcall->params.rstat.stat.extension.len,
fcall->params.rstat.stat.extension.str, buffer);
retval = buflen;
FreeFcall:
@ -1072,7 +1078,7 @@ static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
if (!link)
link = ERR_PTR(-ENOMEM);
else {
len = v9fs_readlink(dentry, link, strlen(link));
len = v9fs_readlink(dentry, link, PATH_MAX);
if (len < 0) {
__putname(link);
@ -1109,10 +1115,7 @@ static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
struct v9fs_session_info *v9ses;
struct v9fs_fid *dfid, *vfid;
struct inode *inode;
struct v9fs_fcall *fcall;
struct v9fs_wstat wstat;
fcall = NULL;
inode = NULL;
vfid = NULL;
v9ses = v9fs_inode2v9ses(dir);
@ -1125,7 +1128,7 @@ static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
}
err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
perm, V9FS_OREAD, &fid, NULL, NULL);
perm, V9FS_OREAD, (char *) extension, &fid, NULL, NULL);
if (err)
goto error;
@ -1148,23 +1151,11 @@ static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
goto error;
}
/* issue a Twstat */
v9fs_blank_wstat(&wstat);
wstat.muid = v9ses->name;
wstat.extension = (char *) extension;
err = v9fs_t_wstat(v9ses, vfid->fid, &wstat, &fcall);
if (err < 0) {
PRINT_FCALL_ERROR("wstat error", fcall);
goto error;
}
kfree(fcall);
dentry->d_op = &v9fs_dentry_operations;
d_instantiate(dentry, inode);
return 0;
error:
kfree(fcall);
if (vfid)
v9fs_fid_destroy(vfid);
@ -1224,7 +1215,7 @@ v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
}
name = __getname();
sprintf(name, "hardlink(%d)\n", oldfid->fid);
sprintf(name, "%d\n", oldfid->fid);
retval = v9fs_vfs_mkspecial(dir, dentry, V9FS_DMLINK, name);
__putname(name);