int v9fs_file_open(struct inode *inode, struct file *file)
{
int err;
struct v9fs_inode *v9inode;
struct v9fs_session_info *v9ses;
struct p9_fid *fid;
int omode;
p9_debug(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file);
v9inode = V9FS_I(inode);
v9ses = v9fs_inode2v9ses(inode);
if (v9fs_proto_dotl(v9ses))
omode = v9fs_open_to_dotl_flags(file->f_flags);
else
omode = v9fs_uflags2omode(file->f_flags,
v9fs_proto_dotu(v9ses));
fid = file->private_data;
if (!fid) {
fid = v9fs_fid_clone(file->f_path.dentry);
if (IS_ERR(fid))
return PTR_ERR(fid);
err = p9_client_open(fid, omode);
if (err < 0) {
p9_client_clunk(fid);
return err;
}
if ((file->f_flags & O_APPEND) &&
(!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)))
generic_file_llseek(file, 0, SEEK_END);
}
file->private_data = fid;
mutex_lock(&v9inode->v_mutex);
if (v9ses->cache && !v9inode->writeback_fid &&
((file->f_flags & O_ACCMODE) != O_RDONLY)) {
/*
* clone a fid and add it to writeback_fid
* we do it during open time instead of
* page dirty time via write_begin/page_mkwrite
* because we want write after unlink usecase
* to work.
*/
fid = v9fs_writeback_fid(file->f_path.dentry);
if (IS_ERR(fid)) {
err = PTR_ERR(fid);
mutex_unlock(&v9inode->v_mutex);
goto out_error;
}
v9inode->writeback_fid = (void *) fid;
}
mutex_unlock(&v9inode->v_mutex);
if (v9ses->cache)
v9fs_cache_inode_set_cookie(inode, file);
return 0;
out_error:
p9_client_clunk(file->private_data);
file->private_data = NULL;
return err;
}
static int plan9_attach(struct session_struct *sp, struct p9_client *clnt,
struct p9_fid *afid, uid_t uid, char *aname,
struct p9_fid **fp)
{
struct p9_nbd_device *nbd = sp->nbd;
struct p9_fid *fid = NULL;
int err;
dprintk(DBG_PLAN9, "%s: p9_client_attach %s\n", nbd->disk->disk_name,
aname);
session_busy(sp);
fid = p9_client_attach(clnt, afid, NULL, uid, aname);
if (IS_ERR(fid)) {
err = PTR_ERR(fid);
fid = NULL;
goto error;
}
if (session_idle(sp) < 0) {
err = -ETIMEDOUT;
goto error;
}
*fp = fid;
return 0;
error:
if (fid)
p9_client_clunk(fid);
return err;
}
ssize_t v9fs_fid_xattr_get(struct p9_fid *fid, const char *name,
void *buffer, size_t buffer_size)
{
ssize_t retval;
u64 attr_size;
struct p9_fid *attr_fid;
struct kvec kvec = {.iov_base = buffer, .iov_len = buffer_size};
struct iov_iter to;
int err;
iov_iter_kvec(&to, READ | ITER_KVEC, &kvec, 1, buffer_size);
attr_fid = p9_client_xattrwalk(fid, name, &attr_size);
if (IS_ERR(attr_fid)) {
retval = PTR_ERR(attr_fid);
p9_debug(P9_DEBUG_VFS, "p9_client_attrwalk failed %zd\n",
retval);
return retval;
}
if (attr_size > buffer_size) {
if (!buffer_size) /* request to get the attr_size */
retval = attr_size;
else
retval = -ERANGE;
} else {
iov_iter_truncate(&to, attr_size);
retval = p9_client_read(attr_fid, 0, &to, &err);
if (err)
retval = err;
}
p9_client_clunk(attr_fid);
return retval;
}
int v9fs_fid_xattr_set(struct p9_fid *fid, const char *name,
const void *value, size_t value_len, int flags)
{
u64 offset = 0;
int retval, msize, write_count;
p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu flags = %d\n",
name, value_len, flags);
/* Clone it */
fid = p9_client_walk(fid, 0, NULL, 1);
if (IS_ERR(fid))
return PTR_ERR(fid);
/*
* On success fid points to xattr
*/
retval = p9_client_xattrcreate(fid, name, value_len, flags);
if (retval < 0) {
p9_debug(P9_DEBUG_VFS, "p9_client_xattrcreate failed %d\n",
retval);
p9_client_clunk(fid);
return retval;
}
msize = fid->clnt->msize;
while (value_len) {
if (value_len > (msize - P9_IOHDRSZ))
write_count = msize - P9_IOHDRSZ;
else
write_count = value_len;
write_count = p9_client_write(fid, ((char *)value)+offset,
NULL, offset, write_count);
if (write_count < 0) {
/* error in xattr write */
retval = write_count;
break;
}
offset += write_count;
value_len -= write_count;
}
return p9_client_clunk(fid);
}
int v9fs_dir_release(struct inode *inode, struct file *filp)
{
struct p9_fid *fid;
fid = filp->private_data;
p9_debug(P9_DEBUG_VFS, "inode: %p filp: %p fid: %d\n",
inode, filp, fid ? fid->fid : -1);
if (fid)
p9_client_clunk(fid);
return 0;
}
int v9fs_dir_release(struct inode *inode, struct file *filp)
{
struct p9_fid *fid;
fid = filp->private_data;
P9_DPRINTK(P9_DEBUG_VFS,
"inode: %p filp: %p fid: %d\n", inode, filp, fid->fid);
filemap_write_and_wait(inode->i_mapping);
p9_client_clunk(fid);
return 0;
}
ssize_t v9fs_fid_xattr_get(struct p9_fid *fid, const char *name,
void *buffer, size_t buffer_size)
{
ssize_t retval;
int msize, read_count;
u64 offset = 0, attr_size;
struct p9_fid *attr_fid;
attr_fid = p9_client_xattrwalk(fid, name, &attr_size);
if (IS_ERR(attr_fid)) {
retval = PTR_ERR(attr_fid);
P9_DPRINTK(P9_DEBUG_VFS,
"p9_client_attrwalk failed %zd\n", retval);
attr_fid = NULL;
goto error;
}
if (!buffer_size) {
/* request to get the attr_size */
retval = attr_size;
goto error;
}
if (attr_size > buffer_size) {
retval = -ERANGE;
goto error;
}
msize = attr_fid->clnt->msize;
while (attr_size) {
if (attr_size > (msize - P9_IOHDRSZ))
read_count = msize - P9_IOHDRSZ;
else
read_count = attr_size;
read_count = p9_client_read(attr_fid, ((char *)buffer)+offset,
NULL, offset, read_count);
if (read_count < 0) {
/* error in xattr read */
retval = read_count;
goto error;
}
offset += read_count;
attr_size -= read_count;
}
/* Total read xattr bytes */
retval = offset;
error:
if (attr_fid)
p9_client_clunk(attr_fid);
return retval;
}
/**
* v9fs_clear_inode - release an inode
* @inode: inode to release
*
*/
void v9fs_evict_inode(struct inode *inode)
{
struct v9fs_inode *v9inode = V9FS_I(inode);
truncate_inode_pages_final(inode->i_mapping);
clear_inode(inode);
filemap_fdatawrite(inode->i_mapping);
v9fs_cache_inode_put_cookie(inode);
/* clunk the fid stashed in writeback_fid */
if (v9inode->writeback_fid) {
p9_client_clunk(v9inode->writeback_fid);
v9inode->writeback_fid = NULL;
}
}
/*
* v9fs_xattr_set()
*
* Create, replace or remove an extended attribute for this inode. Buffer
* is NULL to remove an existing extended attribute, and non-NULL to
* either replace an existing extended attribute, or create a new extended
* attribute. The flags XATTR_REPLACE and XATTR_CREATE
* specify that an extended attribute must exist and must not exist
* previous to the call, respectively.
*
* Returns 0, or a negative error number on failure.
*/
int v9fs_xattr_set(struct dentry *dentry, const char *name,
const void *value, size_t value_len, int flags)
{
u64 offset = 0;
int retval, msize, write_count;
struct p9_fid *fid = NULL;
P9_DPRINTK(P9_DEBUG_VFS, "%s: name = %s value_len = %zu flags = %d\n",
__func__, name, value_len, flags);
fid = v9fs_fid_clone(dentry);
if (IS_ERR(fid)) {
retval = PTR_ERR(fid);
fid = NULL;
goto error;
}
/*
* On success fid points to xattr
*/
retval = p9_client_xattrcreate(fid, name, value_len, flags);
if (retval < 0) {
P9_DPRINTK(P9_DEBUG_VFS,
"p9_client_xattrcreate failed %d\n", retval);
goto error;
}
msize = fid->clnt->msize;;
while (value_len) {
if (value_len > (msize - P9_IOHDRSZ))
write_count = msize - P9_IOHDRSZ;
else
write_count = value_len;
write_count = p9_client_write(fid, ((char *)value)+offset,
NULL, offset, write_count);
if (write_count < 0) {
/* error in xattr write */
retval = write_count;
goto error;
}
offset += write_count;
value_len -= write_count;
}
/* Total read xattr bytes */
retval = offset;
error:
if (fid)
retval = p9_client_clunk(fid);
return retval;
}
int v9fs_fid_xattr_set(struct p9_fid *fid, const char *name,
const void *value, size_t value_len, int flags)
{
struct kvec kvec = {.iov_base = (void *)value, .iov_len = value_len};
struct iov_iter from;
int retval;
iov_iter_kvec(&from, WRITE | ITER_KVEC, &kvec, 1, value_len);
p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu flags = %d\n",
name, value_len, flags);
/* Clone it */
fid = p9_client_walk(fid, 0, NULL, 1);
if (IS_ERR(fid))
return PTR_ERR(fid);
/*
* On success fid points to xattr
*/
retval = p9_client_xattrcreate(fid, name, value_len, flags);
if (retval < 0)
p9_debug(P9_DEBUG_VFS, "p9_client_xattrcreate failed %d\n",
retval);
else
p9_client_write(fid, 0, &from, &retval);
p9_client_clunk(fid);
return retval;
}
ssize_t v9fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
{
return v9fs_xattr_get(dentry, NULL, buffer, buffer_size);
}
const struct xattr_handler *v9fs_xattr_handlers[] = {
&v9fs_xattr_user_handler,
&v9fs_xattr_trusted_handler,
#ifdef CONFIG_9P_FS_POSIX_ACL
&v9fs_xattr_acl_access_handler,
&v9fs_xattr_acl_default_handler,
#endif
#ifdef CONFIG_9P_FS_SECURITY
&v9fs_xattr_security_handler,
#endif
NULL
};
/**
* v9fs_clear_inode - release an inode
* @inode: inode to release
*
*/
void v9fs_evict_inode(struct inode *inode)
{
struct v9fs_inode *v9inode = V9FS_I(inode);
truncate_inode_pages(inode->i_mapping, 0);
end_writeback(inode);
filemap_fdatawrite(inode->i_mapping);
#ifdef CONFIG_9P_FSCACHE
v9fs_cache_inode_put_cookie(inode);
#endif
/* clunk the fid stashed in writeback_fid */
if (v9inode->writeback_fid) {
p9_client_clunk(v9inode->writeback_fid);
v9inode->writeback_fid = NULL;
}
}
int v9fs_file_open(struct inode *inode, struct file *file)
{
int err;
struct v9fs_session_info *v9ses;
struct p9_fid *fid;
int omode;
P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p \n", inode, file);
v9ses = v9fs_inode2v9ses(inode);
omode = v9fs_uflags2omode(file->f_flags, v9fs_proto_dotu(v9ses));
fid = file->private_data;
if (!fid) {
fid = v9fs_fid_clone(file->f_path.dentry);
if (IS_ERR(fid))
return PTR_ERR(fid);
err = p9_client_open(fid, omode);
if (err < 0) {
p9_client_clunk(fid);
return err;
}
if (omode & P9_OTRUNC) {
i_size_write(inode, 0);
inode->i_blocks = 0;
}
if ((file->f_flags & O_APPEND) && (!v9fs_proto_dotu(v9ses)))
generic_file_llseek(file, 0, SEEK_END);
}
file->private_data = fid;
if ((fid->qid.version) && (v9ses->cache)) {
P9_DPRINTK(P9_DEBUG_VFS, "cached");
/* enable cached file options */
if(file->f_op == &v9fs_file_operations)
file->f_op = &v9fs_cached_file_operations;
#ifdef CONFIG_9P_FSCACHE
v9fs_cache_inode_set_cookie(inode, file);
#endif
}
return 0;
}
struct p9_fid *v9fs_writeback_fid(struct dentry *dentry)
{
int err;
struct p9_fid *fid;
fid = clone_fid(v9fs_fid_lookup_with_uid(dentry, GLOBAL_ROOT_UID, 0));
if (IS_ERR(fid))
goto error_out;
/*
* writeback fid will only be used to write back the
* dirty pages. We always request for the open fid in read-write
* mode so that a partial page write which result in page
* read can work.
*/
err = p9_client_open(fid, O_RDWR);
if (err < 0) {
p9_client_clunk(fid);
fid = ERR_PTR(err);
goto error_out;
}
error_out:
return fid;
}
int v9fs_file_open(struct inode *inode, struct file *file)
{
int err;
struct v9fs_session_info *v9ses;
struct p9_fid *fid;
int omode;
P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p \n", inode, file);
v9ses = v9fs_inode2v9ses(inode);
omode = v9fs_uflags2omode(file->f_flags);
fid = file->private_data;
if (!fid) {
fid = v9fs_fid_clone(file->f_path.dentry);
if (IS_ERR(fid))
return PTR_ERR(fid);
err = p9_client_open(fid, omode);
if (err < 0) {
p9_client_clunk(fid);
return err;
}
if (omode & P9_OTRUNC) {
inode->i_size = 0;
inode->i_blocks = 0;
}
}
file->private_data = fid;
if ((fid->qid.version) && (v9ses->cache)) {
P9_DPRINTK(P9_DEBUG_VFS, "cached");
/* enable cached file options */
if(file->f_op == &v9fs_file_operations)
file->f_op = &v9fs_cached_file_operations;
}
return 0;
}
struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
int clone)
{
int err;
struct p9_client *clnt;
struct p9_fid *fid;
struct p9_qid *wqids;
struct p9_req_t *req;
int16_t nwqids, count;
err = 0;
clnt = oldfid->clnt;
if (clone) {
fid = p9_fid_create(clnt);
if (IS_ERR(fid)) {
err = PTR_ERR(fid);
fid = NULL;
goto error;
}
fid->uid = oldfid->uid;
} else
fid = oldfid;
P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
nwname, wnames);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto error;
}
err = p9pdu_readf(req->rc, clnt->dotu, "R", &nwqids, &wqids);
if (err) {
p9pdu_dump(1, req->rc);
p9_free_req(clnt, req);
goto clunk_fid;
}
p9_free_req(clnt, req);
P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
if (nwqids != nwname) {
err = -ENOENT;
goto clunk_fid;
}
for (count = 0; count < nwqids; count++)
P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
count, wqids[count].type, wqids[count].path,
wqids[count].version);
if (nwname)
memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
else
fid->qid = oldfid->qid;
return fid;
clunk_fid:
p9_client_clunk(fid);
fid = NULL;
error:
if (fid && (fid != oldfid))
p9_fid_destroy(fid);
return ERR_PTR(err);
}
static int v9fs_vfs_mkdir_dotl(struct inode *dir,
struct dentry *dentry, int omode)
{
int err;
struct v9fs_session_info *v9ses;
struct p9_fid *fid = NULL, *dfid = NULL;
gid_t gid;
char *name;
mode_t mode;
struct inode *inode;
struct p9_qid qid;
struct dentry *dir_dentry;
struct posix_acl *dacl = NULL, *pacl = NULL;
P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
err = 0;
v9ses = v9fs_inode2v9ses(dir);
omode |= S_IFDIR;
if (dir->i_mode & S_ISGID)
omode |= S_ISGID;
dir_dentry = v9fs_dentry_from_dir_inode(dir);
dfid = v9fs_fid_lookup(dir_dentry);
if (IS_ERR(dfid)) {
err = PTR_ERR(dfid);
P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
dfid = NULL;
goto error;
}
gid = v9fs_get_fsgid_for_create(dir);
mode = omode;
/* Update mode based on ACL value */
err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
if (err) {
P9_DPRINTK(P9_DEBUG_VFS,
"Failed to get acl values in mkdir %d\n", err);
goto error;
}
name = (char *) dentry->d_name.name;
err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
if (err < 0)
goto error;
/* instantiate inode and assign the unopened fid to the dentry */
if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
fid = p9_client_walk(dfid, 1, &name, 1);
if (IS_ERR(fid)) {
err = PTR_ERR(fid);
P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
err);
fid = NULL;
goto error;
}
inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
err);
goto error;
}
d_instantiate(dentry, inode);
err = v9fs_fid_add(dentry, fid);
if (err < 0)
goto error;
fid = NULL;
} else {
/*
* Not in cached mode. No need to populate
* inode with stat. We need to get an inode
* so that we can set the acl with dentry
*/
inode = v9fs_get_inode(dir->i_sb, mode);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
goto error;
}
d_instantiate(dentry, inode);
}
/* Now set the ACL based on the default value */
v9fs_set_create_acl(dentry, dacl, pacl);
inc_nlink(dir);
v9fs_invalidate_inode_attr(dir);
error:
if (fid)
p9_client_clunk(fid);
return err;
}
static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data)
{
struct super_block *sb = NULL;
struct inode *inode = NULL;
struct dentry *root = NULL;
struct v9fs_session_info *v9ses = NULL;
umode_t mode = S_IRWXUGO | S_ISVTX;
struct p9_fid *fid;
int retval = 0;
p9_debug(P9_DEBUG_VFS, "\n");
v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
if (!v9ses)
return ERR_PTR(-ENOMEM);
fid = v9fs_session_init(v9ses, dev_name, data);
if (IS_ERR(fid)) {
retval = PTR_ERR(fid);
goto free_session;
}
sb = sget(fs_type, NULL, v9fs_set_super, flags, v9ses);
if (IS_ERR(sb)) {
retval = PTR_ERR(sb);
goto clunk_fid;
}
v9fs_fill_super(sb, v9ses, flags, data);
if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
sb->s_d_op = &v9fs_cached_dentry_operations;
else
sb->s_d_op = &v9fs_dentry_operations;
inode = v9fs_get_inode(sb, S_IFDIR | mode, 0);
if (IS_ERR(inode)) {
retval = PTR_ERR(inode);
goto release_sb;
}
root = d_make_root(inode);
if (!root) {
retval = -ENOMEM;
goto release_sb;
}
sb->s_root = root;
if (v9fs_proto_dotl(v9ses)) {
struct p9_stat_dotl *st = NULL;
st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
if (IS_ERR(st)) {
retval = PTR_ERR(st);
goto release_sb;
}
d_inode(root)->i_ino = v9fs_qid2ino(&st->qid);
v9fs_stat2inode_dotl(st, d_inode(root));
kfree(st);
} else {
struct p9_wstat *st = NULL;
st = p9_client_stat(fid);
if (IS_ERR(st)) {
retval = PTR_ERR(st);
goto release_sb;
}
d_inode(root)->i_ino = v9fs_qid2ino(&st->qid);
v9fs_stat2inode(st, d_inode(root), sb);
p9stat_free(st);
kfree(st);
}
retval = v9fs_get_acl(inode, fid);
if (retval)
goto release_sb;
v9fs_fid_add(root, fid);
p9_debug(P9_DEBUG_VFS, " simple set mount, return 0\n");
return dget(sb->s_root);
clunk_fid:
p9_client_clunk(fid);
v9fs_session_close(v9ses);
free_session:
kfree(v9ses);
return ERR_PTR(retval);
release_sb:
/*
* we will do the session_close and root dentry release
* in the below call. But we need to clunk fid, because we haven't
* attached the fid to dentry so it won't get clunked
* automatically.
*/
p9_client_clunk(fid);
deactivate_locked_super(sb);
return ERR_PTR(retval);
}
/**
* v9fs_vfs_mknod_dotl - create a special file
* @dir: inode destination for new link
* @dentry: dentry for file
* @mode: mode for creation
* @rdev: device associated with special file
*
*/
static int
v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
dev_t rdev)
{
int err;
gid_t gid;
char *name;
mode_t mode;
struct v9fs_session_info *v9ses;
struct p9_fid *fid = NULL, *dfid = NULL;
struct inode *inode;
struct p9_qid qid;
struct dentry *dir_dentry;
struct posix_acl *dacl = NULL, *pacl = NULL;
P9_DPRINTK(P9_DEBUG_VFS,
" %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
if (!new_valid_dev(rdev))
return -EINVAL;
v9ses = v9fs_inode2v9ses(dir);
dir_dentry = v9fs_dentry_from_dir_inode(dir);
dfid = v9fs_fid_lookup(dir_dentry);
if (IS_ERR(dfid)) {
err = PTR_ERR(dfid);
P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
dfid = NULL;
goto error;
}
gid = v9fs_get_fsgid_for_create(dir);
mode = omode;
/* Update mode based on ACL value */
err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
if (err) {
P9_DPRINTK(P9_DEBUG_VFS,
"Failed to get acl values in mknod %d\n", err);
goto error;
}
name = (char *) dentry->d_name.name;
err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
if (err < 0)
goto error;
v9fs_invalidate_inode_attr(dir);
/* instantiate inode and assign the unopened fid to the dentry */
if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
fid = p9_client_walk(dfid, 1, &name, 1);
if (IS_ERR(fid)) {
err = PTR_ERR(fid);
P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
err);
fid = NULL;
goto error;
}
inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
err);
goto error;
}
d_instantiate(dentry, inode);
err = v9fs_fid_add(dentry, fid);
if (err < 0)
goto error;
fid = NULL;
} else {
/*
* Not in cached mode. No need to populate inode with stat.
* socket syscall returns a fd, so we need instantiate
*/
inode = v9fs_get_inode(dir->i_sb, mode);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
goto error;
}
d_instantiate(dentry, inode);
}
/* Now set the ACL based on the default value */
v9fs_set_create_acl(dentry, dacl, pacl);
error:
if (fid)
p9_client_clunk(fid);
return err;
}
static int
v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
const char *symname)
{
int err;
gid_t gid;
char *name;
struct p9_qid qid;
struct inode *inode;
struct p9_fid *dfid;
struct p9_fid *fid = NULL;
struct v9fs_session_info *v9ses;
name = (char *) dentry->d_name.name;
P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
dir->i_ino, name, symname);
v9ses = v9fs_inode2v9ses(dir);
dfid = v9fs_fid_lookup(dentry->d_parent);
if (IS_ERR(dfid)) {
err = PTR_ERR(dfid);
P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
return err;
}
gid = v9fs_get_fsgid_for_create(dir);
/* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
if (err < 0) {
P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
goto error;
}
v9fs_invalidate_inode_attr(dir);
if (v9ses->cache) {
/* Now walk from the parent so we can get an unopened fid. */
fid = p9_client_walk(dfid, 1, &name, 1);
if (IS_ERR(fid)) {
err = PTR_ERR(fid);
P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
err);
fid = NULL;
goto error;
}
/* instantiate inode and assign the unopened fid to dentry */
inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
err);
goto error;
}
d_instantiate(dentry, inode);
err = v9fs_fid_add(dentry, fid);
if (err < 0)
goto error;
fid = NULL;
} else {
/* Not in cached mode. No need to populate inode with stat */
inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
goto error;
}
d_instantiate(dentry, inode);
}
error:
if (fid)
p9_client_clunk(fid);
return err;
}
static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data,
struct vfsmount *mnt)
{
struct super_block *sb = NULL;
struct inode *inode = NULL;
struct dentry *root = NULL;
struct v9fs_session_info *v9ses = NULL;
int mode = S_IRWXUGO | S_ISVTX;
struct p9_fid *fid;
int retval = 0;
P9_DPRINTK(P9_DEBUG_VFS, " \n");
v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
if (!v9ses)
return -ENOMEM;
fid = v9fs_session_init(v9ses, dev_name, data);
if (IS_ERR(fid)) {
retval = PTR_ERR(fid);
/*
* we need to call session_close to tear down some
* of the data structure setup by session_init
*/
goto close_session;
}
sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
if (IS_ERR(sb)) {
retval = PTR_ERR(sb);
goto clunk_fid;
}
v9fs_fill_super(sb, v9ses, flags, data);
inode = v9fs_get_inode(sb, S_IFDIR | mode);
if (IS_ERR(inode)) {
retval = PTR_ERR(inode);
goto release_sb;
}
root = d_alloc_root(inode);
if (!root) {
iput(inode);
retval = -ENOMEM;
goto release_sb;
}
sb->s_root = root;
if (v9fs_proto_dotl(v9ses)) {
struct p9_stat_dotl *st = NULL;
st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
if (IS_ERR(st)) {
retval = PTR_ERR(st);
goto release_sb;
}
v9fs_stat2inode_dotl(st, root->d_inode);
kfree(st);
} else {
struct p9_wstat *st = NULL;
st = p9_client_stat(fid);
if (IS_ERR(st)) {
retval = PTR_ERR(st);
goto release_sb;
}
root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
v9fs_stat2inode(st, root->d_inode, sb);
p9stat_free(st);
kfree(st);
}
retval = v9fs_get_acl(inode, fid);
if (retval)
goto release_sb;
v9fs_fid_add(root, fid);
P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0\n");
simple_set_mnt(mnt, sb);
return 0;
clunk_fid:
p9_client_clunk(fid);
close_session:
v9fs_session_close(v9ses);
kfree(v9ses);
return retval;
release_sb:
/*
* we will do the session_close and root dentry release
* in the below call. But we need to clunk fid, because we haven't
* attached the fid to dentry so it won't get clunked
* automatically.
*/
p9_client_clunk(fid);
deactivate_locked_super(sb);
return retval;
}
static struct p9_fid *v9fs_fid_lookup_with_uid(struct dentry *dentry,
kuid_t uid, int any)
{
struct dentry *ds;
const unsigned char **wnames, *uname;
int i, n, l, clone, access;
struct v9fs_session_info *v9ses;
struct p9_fid *fid, *old_fid = NULL;
v9ses = v9fs_dentry2v9ses(dentry);
access = v9ses->flags & V9FS_ACCESS_MASK;
fid = v9fs_fid_find(dentry, uid, any);
if (fid)
return fid;
/*
* we don't have a matching fid. To do a TWALK we need
* parent fid. We need to prevent rename when we want to
* look at the parent.
*/
down_read(&v9ses->rename_sem);
ds = dentry->d_parent;
fid = v9fs_fid_find(ds, uid, any);
if (fid) {
/* Found the parent fid do a lookup with that */
fid = p9_client_walk(fid, 1, &dentry->d_name.name, 1);
goto fid_out;
}
up_read(&v9ses->rename_sem);
/* start from the root and try to do a lookup */
fid = v9fs_fid_find(dentry->d_sb->s_root, uid, any);
if (!fid) {
/* the user is not attached to the fs yet */
if (access == V9FS_ACCESS_SINGLE)
return ERR_PTR(-EPERM);
if (v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses))
uname = NULL;
else
uname = v9ses->uname;
fid = p9_client_attach(v9ses->clnt, NULL, uname, uid,
v9ses->aname);
if (IS_ERR(fid))
return fid;
v9fs_fid_add(dentry->d_sb->s_root, fid);
}
/* If we are root ourself just return that */
if (dentry->d_sb->s_root == dentry)
return fid;
/*
* Do a multipath walk with attached root.
* When walking parent we need to make sure we
* don't have a parallel rename happening
*/
down_read(&v9ses->rename_sem);
n = build_path_from_dentry(v9ses, dentry, &wnames);
if (n < 0) {
fid = ERR_PTR(n);
goto err_out;
}
clone = 1;
i = 0;
while (i < n) {
l = min(n - i, P9_MAXWELEM);
/*
* We need to hold rename lock when doing a multipath
* walk to ensure none of the patch component change
*/
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);
goto err_out;
}
old_fid = fid;
i += l;
clone = 0;
}
kfree(wnames);
fid_out:
if (!IS_ERR(fid)) {
spin_lock(&dentry->d_lock);
if (d_unhashed(dentry)) {
spin_unlock(&dentry->d_lock);
p9_client_clunk(fid);
fid = ERR_PTR(-ENOENT);
} else {
__add_fid(dentry, fid);
spin_unlock(&dentry->d_lock);
}
}
err_out:
up_read(&v9ses->rename_sem);
return fid;
}
static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data,
struct vfsmount *mnt)
{
struct super_block *sb = NULL;
struct inode *inode = NULL;
struct dentry *root = NULL;
struct v9fs_session_info *v9ses = NULL;
struct p9_stat *st = NULL;
int mode = S_IRWXUGO | S_ISVTX;
uid_t uid = current->fsuid;
gid_t gid = current->fsgid;
struct p9_fid *fid;
int retval = 0;
P9_DPRINTK(P9_DEBUG_VFS, " \n");
st = NULL;
v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
if (!v9ses)
return -ENOMEM;
fid = v9fs_session_init(v9ses, dev_name, data);
if (IS_ERR(fid)) {
retval = PTR_ERR(fid);
fid = NULL;
kfree(v9ses);
v9ses = NULL;
goto error;
}
st = p9_client_stat(fid);
if (IS_ERR(st)) {
retval = PTR_ERR(st);
goto error;
}
sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
if (IS_ERR(sb)) {
retval = PTR_ERR(sb);
goto error;
}
v9fs_fill_super(sb, v9ses, flags);
inode = v9fs_get_inode(sb, S_IFDIR | mode);
if (IS_ERR(inode)) {
retval = PTR_ERR(inode);
goto error;
}
inode->i_uid = uid;
inode->i_gid = gid;
root = d_alloc_root(inode);
if (!root) {
retval = -ENOMEM;
goto error;
}
sb->s_root = root;
root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
v9fs_stat2inode(st, root->d_inode, sb);
v9fs_fid_add(root, fid);
kfree(st);
return simple_set_mnt(mnt, sb);
error:
kfree(st);
if (fid)
p9_client_clunk(fid);
if (v9ses) {
v9fs_session_close(v9ses);
kfree(v9ses);
}
if (sb) {
up_write(&sb->s_umount);
deactivate_super(sb);
}
return retval;
}
static int
v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
struct nameidata *nd)
{
int err = 0;
gid_t gid;
int flags;
mode_t mode;
char *name = NULL;
struct file *filp;
struct p9_qid qid;
struct inode *inode;
struct p9_fid *fid = NULL;
struct v9fs_inode *v9inode;
struct p9_fid *dfid, *ofid, *inode_fid;
struct v9fs_session_info *v9ses;
struct posix_acl *pacl = NULL, *dacl = NULL;
v9ses = v9fs_inode2v9ses(dir);
if (nd && nd->flags & LOOKUP_OPEN)
flags = nd->intent.open.flags - 1;
else {
/*
* create call without LOOKUP_OPEN is due
* to mknod of regular files. So use mknod
* operation.
*/
return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
}
name = (char *) dentry->d_name.name;
P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
"mode:0x%x\n", name, flags, omode);
dfid = v9fs_fid_lookup(dentry->d_parent);
if (IS_ERR(dfid)) {
err = PTR_ERR(dfid);
P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
return err;
}
/* clone a fid to use for creation */
ofid = p9_client_walk(dfid, 0, NULL, 1);
if (IS_ERR(ofid)) {
err = PTR_ERR(ofid);
P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
return err;
}
gid = v9fs_get_fsgid_for_create(dir);
mode = omode;
/* Update mode based on ACL value */
err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
if (err) {
P9_DPRINTK(P9_DEBUG_VFS,
"Failed to get acl values in creat %d\n", err);
goto error;
}
err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid);
if (err < 0) {
P9_DPRINTK(P9_DEBUG_VFS,
"p9_client_open_dotl failed in creat %d\n",
err);
goto error;
}
v9fs_invalidate_inode_attr(dir);
/* instantiate inode and assign the unopened fid to the dentry */
fid = p9_client_walk(dfid, 1, &name, 1);
if (IS_ERR(fid)) {
err = PTR_ERR(fid);
P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
fid = NULL;
goto error;
}
inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
goto error;
}
d_instantiate(dentry, inode);
err = v9fs_fid_add(dentry, fid);
if (err < 0)
goto error;
/* Now set the ACL based on the default value */
v9fs_set_create_acl(dentry, dacl, pacl);
v9inode = V9FS_I(inode);
mutex_lock(&v9inode->v_mutex);
if (v9ses->cache && !v9inode->writeback_fid &&
((flags & O_ACCMODE) != O_RDONLY)) {
/*
* clone a fid and add it to writeback_fid
* we do it during open time instead of
* page dirty time via write_begin/page_mkwrite
* because we want write after unlink usecase
* to work.
*/
inode_fid = v9fs_writeback_fid(dentry);
if (IS_ERR(inode_fid)) {
err = PTR_ERR(inode_fid);
mutex_unlock(&v9inode->v_mutex);
goto error;
}
v9inode->writeback_fid = (void *) inode_fid;
}
mutex_unlock(&v9inode->v_mutex);
/* Since we are opening a file, assign the open fid to the file */
filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
if (IS_ERR(filp)) {
p9_client_clunk(ofid);
return PTR_ERR(filp);
}
filp->private_data = ofid;
#ifdef CONFIG_9P_FSCACHE
if (v9ses->cache)
v9fs_cache_inode_set_cookie(inode, filp);
#endif
return 0;
error:
if (ofid)
p9_client_clunk(ofid);
if (fid)
p9_client_clunk(fid);
return err;
}