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9p-ops.c
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/*
* The in-kernel 9p server
*
* Copyright (C) 2016 by Yuankai Guo <yuankai.guo@intel.com>
* Copyright (C) 2017 by Anthony Xu <anthony.xu@intel.com>
* Copyright (C) 2017 by Yu-chu Yang <yu-chu.yang@intel.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/fs.h>
#include <linux/xattr.h>
#include <linux/stat.h>
#include <linux/statfs.h>
#include <linux/in.h>
#include <linux/namei.h>
#include <linux/net.h>
#include <linux/ipv6.h>
#include <linux/kthread.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/un.h>
#include <linux/uaccess.h>
#include <linux/inet.h>
#include <linux/idr.h>
#include <linux/file.h>
#include <linux/parser.h>
#include <linux/slab.h>
#include <linux/syscalls.h>
#include <net/9p/9p.h>
#include "vhost-9p.h"
#include "protocol.h"
#define MAX_FILE_NAME (NAME_MAX + 1)
const size_t P9_PDU_HDR_LEN = sizeof(u32) + sizeof(u8) + sizeof(u16);
/* 9p helper routines */
/* clear SUID/SGID when writing to the file by non-owner */
static void p9_clear_sugid(struct p9_server *s, struct p9_server_fid *fid)
{
int err;
struct kstat st;
err = vfs_getattr(&fid->path, &st);
if (err)
return;
p9s_debug("p9_clear_sugid: user %d, file user %d\n",
fid->uid, st.uid.val);
if (st.uid.val == fid->uid)
return;
if (st.mode & (S_ISUID | S_ISGID)) {
struct iattr iattr;
struct dentry *dentry = fid->path.dentry;
memset(&iattr, 0, sizeof(struct iattr));
iattr.ia_valid |= ATTR_MODE;
iattr.ia_mode = st.mode & (~S_ISUID);
iattr.ia_mode &= ~S_ISGID;
iattr.ia_ctime = current_time(dentry->d_inode);
inode_lock(dentry->d_inode);
notify_change(dentry, &iattr, NULL);
inode_unlock(dentry->d_inode);
}
}
static struct dentry *p9_lookup_one_len(
const char *name, struct dentry *dentry, int len)
{
if (!inode_is_locked(dentry->d_inode)) {
p9s_debug("lookup_one_len: inode %s is not locked\n",
dentry->d_name.name);
return lookup_one_len_unlocked(name, dentry, len);
}
p9s_debug("lookup_one_len: inode %s is locked\n",
dentry->d_name.name);
return lookup_one_len(name, dentry, len);
}
static struct p9_server_fid *lookup_fid(struct p9_server *s, u32 fid_val)
{
struct rb_node *node = s->fids.rb_node;
struct p9_server_fid *cur;
p9s_debug("find fid : %d\n", fid_val);
while (node) {
cur = rb_entry(node, struct p9_server_fid, node);
if (fid_val < cur->fid)
node = node->rb_left;
else if (fid_val > cur->fid)
node = node->rb_right;
else{
p9s_debug("fid : %d is found\n", cur->fid);
return cur;
}
}
return ERR_PTR(-ENOENT);
}
static struct p9_server_fid *new_fid(struct p9_server *s, u32 fid_val,
struct path *path)
{
struct p9_server_fid *fid;
struct rb_node **node = &(s->fids.rb_node), *parent = NULL;
p9s_debug("create fid : %d\n", fid_val);
while (*node) {
int result = fid_val
- rb_entry(*node, struct p9_server_fid, node)->fid;
parent = *node;
if (result < 0)
node = &((*node)->rb_left);
else if (result > 0)
node = &((*node)->rb_right);
else
return ERR_PTR(-EEXIST);
}
fid = kmalloc(sizeof(struct p9_server_fid), GFP_KERNEL);
if (!fid)
return ERR_PTR(-ENOMEM);
fid->fid = fid_val;
fid->uid = s->uid;
fid->filp = NULL;
fid->path = *path;
fid->fid_type = P9_FID_NONE;
rb_link_node(&fid->node, parent, node);
rb_insert_color(&fid->node, &s->fids);
p9s_debug("fid : %d created\n", fid_val);
return fid;
}
static struct p9_server_fid *new_xattr_fid(struct p9_server *s, u32 fid_val,
struct path *path, char *name)
{
struct p9_server_fid *fid = NULL;
fid = new_fid(s, fid_val, path);
if (IS_ERR(fid)) {
p9s_debug ("new_xattr_fid: Error creating fid for fid_val %d\n", fid_val);
return fid;
}
fid->fid_type = P9_FID_XATTR;
fid->ref = 0;
fid->clunked = 0;
fid->xattr.len = 0;
fid->xattr.copied_len = 0;
fid->xattr.xattrwalk_fid = false;
fid->xattr.flags = 0;
if (name) {
fid->xattr.name = kstrdup(name, GFP_KERNEL);
}
else {
fid->xattr.name = NULL;
}
fid->xattr.value = NULL;
return fid;
}
static inline void iov_iter_clone(struct iov_iter *dst, struct iov_iter *src)
{
memcpy(dst, src, sizeof(struct iov_iter));
}
static int gen_qid(struct path *path, struct p9_qid *qid, struct kstat *st)
{
int err;
struct kstat _st;
if (!st)
st = &_st;
err = vfs_getattr(path, st);
if (err)
return err;
/* TODO: incomplete types */
qid->version = st->mtime.tv_sec;
qid->path = st->ino;
qid->type = P9_QTFILE;
if (S_ISDIR(st->mode))
qid->type |= P9_QTDIR;
if (S_ISLNK(st->mode))
qid->type |= P9_QTSYMLINK;
return 0;
}
static int set_owner(struct dentry *d, int uid, int gid)
{
int err = 0;
struct iattr iattr;
p9s_debug("set_owner : uid %d, gid %d\n", uid, gid);
memset(&iattr, 0, sizeof(struct iattr));
if (uid >= 0) {
iattr.ia_valid |= ATTR_UID;
iattr.ia_uid.val = uid;
}
if (gid >= 0) {
iattr.ia_valid |= ATTR_GID;
iattr.ia_gid.val = gid;
}
if (iattr.ia_valid) {
inode_lock(d->d_inode);
err = notify_change(d, &iattr, NULL);
inode_unlock(d->d_inode);
if (err < 0)
return err;
}
return 0;
}
/* 9p operation functions */
static int p9_op_version(struct p9_server *s, struct p9_fcall *in,
struct p9_fcall *out)
{
u32 msize;
char *version;
p9pdu_readf(in, "ds", &msize, &version);
if (!strcmp(version, "9P2000.L"))
p9pdu_writef(out, "ds", msize, version);
else
p9pdu_writef(out, "ds", msize, "unknown");
kfree(version);
return 0;
}
// TODO: uname, aname, uid, afid
static int p9_op_attach(struct p9_server *s, struct p9_fcall *in,
struct p9_fcall *out)
{
int err;
char *uname, *aname;
struct p9_qid qid;
struct p9_server_fid *fid;
u32 fid_val, afid, uid;
p9pdu_readf(in, "ddssd", &fid_val, &afid,
&uname, &aname, &uid);
p9s_debug("attach : afid %d uname %s aname %s uid %d\n",
afid ? afid : -1, uname, aname, uid);
kfree(uname);
kfree(aname);
s->uid = uid;
fid = lookup_fid(s, fid_val);
if (IS_ERR(fid)) {
fid = new_fid(s, fid_val, &s->root);
if (IS_ERR(fid))
return PTR_ERR(fid);
}
err = gen_qid(&fid->path, &qid, NULL);
if (err)
return err;
p9s_debug("attached : qid = %x.%llx.%x\n",
qid.type, (unsigned long long)qid.path, qid.version);
p9pdu_writef(out, "Q", &qid);
return 0;
}
// TODO: request_mask
static int p9_op_getattr(struct p9_server *s, struct p9_fcall *in,
struct p9_fcall *out)
{
int err;
u32 fid_val;
u64 request_mask;
struct p9_server_fid *fid;
struct kstat st;
struct p9_qid qid;
u64 dev;
p9pdu_readf(in, "dq", &fid_val, &request_mask);
p9s_debug("getattr : fid %d, request_mask %lld\n",
fid_val, request_mask);
fid = lookup_fid(s, fid_val);
if (IS_ERR(fid))
return PTR_ERR(fid);
err = gen_qid(&fid->path, &qid, &st);
if (err)
return err;
dev = new_encode_dev(st.rdev);
p9pdu_writef(out, "qQdugqqqqqqqqqqqqqqq",
P9_STATS_BASIC, &qid, st.mode, st.uid, st.gid,
st.nlink, dev, st.size, st.blksize, st.blocks,
st.atime.tv_sec, st.atime.tv_nsec,
st.mtime.tv_sec, st.mtime.tv_nsec,
st.ctime.tv_sec, st.ctime.tv_nsec,
0, 0, 0, 0);
return 0;
}
static int p9_op_clunk(struct p9_server *s, struct p9_fcall *in,
struct p9_fcall *out)
{
u32 fid_val;
struct p9_server_fid *fid;
p9pdu_readf(in, "d", &fid_val);
fid = lookup_fid(s, fid_val);
if (IS_ERR(fid))
return 0;
p9s_debug("p9_op_clunk: fid : %d, type %d\n", fid_val,
fid->fid_type);
if (fid->fid_type == P9_FID_XATTR) {
/* Be paranoid otherwise you crash the host */
#if 0
if (strlen(fid->xattr.name)) {
kfree(fid->xattr.name);
}
if (fid->xattr.len > 0) {
kfree(fid->xattr.value);
}
#endif
}
else {
if (!IS_ERR_OR_NULL(fid->filp))
filp_close(fid->filp, NULL);
}
rb_erase(&fid->node, &s->fids);
kfree(fid);
p9s_debug("fid : %d destroyed\n", fid_val);
return 0;
}
static int p9_op_walk(struct p9_server *s, struct p9_fcall *in,
struct p9_fcall *out)
{
int err;
size_t t;
u16 nwqid, nwname;
u32 fid_val, newfid_val;
char *name;
struct p9_qid qid;
struct p9_server_fid *fid, *newfid;
struct path new_path;
struct dentry *dentry;
p9pdu_readf(in, "ddw", &fid_val, &newfid_val, &nwname);
/* Get the indicated fid. */
fid = lookup_fid(s, fid_val);
if (IS_ERR(fid))
return PTR_ERR(fid);
/* Check if the newfid already exists. */
newfid = lookup_fid(s, newfid_val);
if (!IS_ERR(newfid) && newfid_val != fid_val)
return -EEXIST;
p9s_debug("walk : fids %d,%d nwname %ud\n", fid_val,
newfid_val, nwname);
new_path = fid->path;
nwqid = 0;
out->size += sizeof(u16);
if (nwname) {
dentry = fid->path.dentry;
for (; nwqid < nwname; nwqid++) {
p9pdu_readf(in, "s", &name);
p9s_debug("walk : name %s\n", name);
/* ".." is not allowed. */
if (name[0] == '.' && name[1] == '.' && name[2] == '\0')
break;
new_path.dentry =
p9_lookup_one_len(name, dentry, strlen(name));
kfree(name);
if (IS_ERR(new_path.dentry)) {
return PTR_ERR(new_path.dentry);
} else if (d_really_is_negative(new_path.dentry)) {
return -ENOENT;
}
err = gen_qid(&new_path, &qid, NULL);
if (err)
return err;
// TODO: verify if it's valid
p9pdu_writef(out, "Q", &qid);
p9s_debug("walk : qid = [%d] %x.%llx.%x\n",
nwqid, qid.type, qid.path, qid.version);
if (nwqid)
dput(dentry);
dentry = new_path.dentry;
}
if (!nwqid)
return err;
} else {
/* If nwname is 0, it's equivalent to walking
* to the current directory. */
err = gen_qid(&new_path, &qid, NULL);
if (err)
return err;
p9pdu_writef(out, "Q", &qid);
p9s_debug("walk : qid = %x.%llx.%x\n",
qid.type, qid.path, qid.version);
}
if (fid_val == newfid_val) {
fid->path = new_path;
} else {
newfid = new_fid(s, newfid_val, &new_path);
if (IS_ERR(newfid))
return PTR_ERR(newfid);
newfid->uid = fid->uid;
}
t = out->size;
out->size = P9_PDU_HDR_LEN;
p9pdu_writef(out, "w", nwqid);
out->size = t;
p9s_debug("walked : nwqid %d\n", nwqid);
return 0;
}
static int p9_op_statfs(struct p9_server *s, struct p9_fcall *in,
struct p9_fcall *out)
{
int err;
u64 fsid;
u32 fid_val;
struct p9_server_fid *fid;
struct kstatfs st;
p9pdu_readf(in, "d", &fid_val);
p9s_debug("Stat : fid %d\n", fid_val);
fid = lookup_fid(s, fid_val);
if (IS_ERR(fid))
return PTR_ERR(fid);
err = vfs_statfs(&fid->path, &st);
if (err)
return err;
/* FIXME!! f_blocks needs update based on client msize */
fsid = (unsigned int) st.f_fsid.val[0] |
(unsigned long long)st.f_fsid.val[1] << 32;
p9pdu_writef(out, "ddqqqqqqd", st.f_type,
st.f_bsize, st.f_blocks, st.f_bfree, st.f_bavail,
st.f_files, st.f_ffree, fsid, st.f_namelen);
return 0;
}
/*
* FIXME!! Need to map to protocol independent value. Upstream
* 9p also have the same BUG
*/
static int build_openflags(int flags)
{
flags &= ~(O_NOCTTY | FASYNC | O_CREAT | O_DIRECT);
flags |= O_NOFOLLOW;
return flags;
}
static int p9_op_open(struct p9_server *s, struct p9_fcall *in,
struct p9_fcall *out)
{
int err;
u32 fid_val, flags;
struct p9_qid qid;
struct p9_server_fid *fid;
p9pdu_readf(in, "dd", &fid_val, &flags);
p9s_debug("open : qid = %x.%llx.%x\n",
qid.type, (unsigned long long)qid.path, qid.version);
fid = lookup_fid(s, fid_val);
if (IS_ERR(fid))
return PTR_ERR(fid);
else if (fid->filp)
// TODO: verify if being error is also considered busy
return -EBUSY;
err = gen_qid(&fid->path, &qid, NULL);
if (err)
return err;
fid->filp =
dentry_open(&fid->path, build_openflags(flags), current_cred());
if (IS_ERR(fid->filp)) {
fid->filp = NULL;
return PTR_ERR(fid->filp);
}
/* FIXME!! need ot send proper iounit */
p9pdu_writef(out, "Qd", &qid, 0L);
p9s_debug("opened : qid = %x.%llx.%x\n",
qid.type, (unsigned long long)qid.path, qid.version);
return 0;
}
static int p9_op_create(struct p9_server *s, struct p9_fcall *in,
struct p9_fcall *out)
{
int err;
char *name;
u32 dfid_val, flags, mode, gid;
struct p9_qid qid;
struct p9_server_fid *dfid;
struct path new_path;
struct file *new_filp;
struct dentry *dentry;
p9pdu_readf(in, "d", &dfid_val);
dfid = lookup_fid(s, dfid_val);
if (IS_ERR(dfid))
return PTR_ERR(dfid);
else if (dfid->filp)
return -EBUSY;
p9pdu_readf(in, "sddd", &name, &flags, &mode, &gid);
p9s_debug("create : fid %d name %s flags %d mode %d gid %d\n",
dfid_val, name, flags, mode, gid);
dentry = dfid->path.dentry;
new_path.mnt = dfid->path.mnt;
new_path.dentry = p9_lookup_one_len(name, dentry, strlen(name));
kfree(name);
if (IS_ERR(new_path.dentry))
return PTR_ERR(new_path.dentry);
else if (d_really_is_positive(new_path.dentry)) {
pr_notice("create: postive dentry!\n");
return -EEXIST;
}
err = vfs_create(dentry->d_inode, new_path.dentry,
mode, build_openflags(flags) & O_EXCL);
if (err)
return err;
set_owner(new_path.dentry, dfid->uid, gid);
new_filp = dentry_open(&new_path,
build_openflags(flags) | O_CREAT, current_cred());
if (IS_ERR(new_filp))
return PTR_ERR(new_filp);
err = gen_qid(&new_path, &qid, NULL);
if (err)
goto err;
dfid->path = new_path;
dfid->filp = new_filp;
p9pdu_writef(out, "Qd", &qid, 0L);
p9s_debug("created : qid = %x.%llx.%x\n",
qid.type, (unsigned long long)qid.path, qid.version);
return 0;
err:
filp_close(new_filp, NULL);
return err;
}
struct p9_readdir_ctx {
size_t i, count;
int err;
bool is_root;
struct dir_context ctx;
struct path *parent;
struct p9_fcall *out;
struct {
struct p9_qid qid;
char name[MAX_FILE_NAME];
unsigned int d_type;
} prev;
};
/*
* The callback function from iterate_dir.
*
* Note: returning non-zero terminates the executing of iterate_dir.
* However, iterate_dir will still return zero.
*
* Note: weird logic: the offset is of the previous element. So we
* deal with the previous element in each iteration.
*/
static int p9_readdir_cb(struct dir_context *ctx, const char *name, int namlen,
loff_t offset, u64 ino, unsigned int d_type)
{
size_t write_len;
struct path path;
struct p9_readdir_ctx *_ctx =
container_of(ctx, struct p9_readdir_ctx, ctx);
write_len = sizeof(u8) + // qid.type
sizeof(u32) + // qid.version
sizeof(u64) + // qid.path
sizeof(u64) + // offset
sizeof(u8) + // d_type
sizeof(u16) + // name.len
namlen; // name
if (namlen >= MAX_FILE_NAME) {
pr_err("max file name is %d, this file name is %d\n",
MAX_FILE_NAME - 1, namlen);
return 1;
}
// If writing this dirent would cause an overflow,
// terminate iterate_dir.
if (_ctx->i + write_len > _ctx->count)
return 1;
// Writing the previous element with current offset
if (_ctx->i) {
p9s_debug("readdir_cb: offset %lld d_type %d name %s\n",
offset, _ctx->prev.d_type, _ctx->prev.name);
p9pdu_writef(_ctx->out, "Qqbs", &_ctx->prev.qid, (u64) offset,
_ctx->prev.d_type, _ctx->prev.name);
}
/* Prepare the dirent for the next iteration. */
path.mnt = _ctx->parent->mnt;
// lookup_one_len doesn't allow the lookup of "." and "..".i
// We have to do it ourselves.
if (namlen == 1 && name[0] == '.')
path.dentry = _ctx->parent->dentry;
else if (namlen == 2 && name[0] == '.' && name[1] == '.')
// No ".." allowed on the mount root
path.dentry = _ctx->is_root ?
_ctx->parent->dentry : _ctx->parent->dentry->d_parent;
else
path.dentry =
p9_lookup_one_len(name, _ctx->parent->dentry, namlen);
if (IS_ERR(path.dentry)) {
_ctx->err = PTR_ERR(path.dentry);
goto out;
} else if (d_really_is_negative(path.dentry)) {
_ctx->err = -ENOENT;
goto out;
}
_ctx->err = gen_qid(&path, &_ctx->prev.qid, NULL);
if (_ctx->err)
goto out;
strncpy(_ctx->prev.name, name, namlen);
_ctx->prev.name[namlen] = 0;
_ctx->prev.d_type = d_type;
_ctx->i += write_len;
out:
return _ctx->err;
}
static int p9_op_readdir(struct p9_server *s, struct p9_fcall *in,
struct p9_fcall *out)
{
int err;
u32 dfid_val, count;
u64 offset;
struct p9_server_fid *dfid;
struct p9_readdir_ctx _ctx = {
.ctx.actor = p9_readdir_cb
};
p9pdu_readf(in, "dqd", &dfid_val, &offset, &count);
p9s_debug("readdir : fid %d offset %llu count %d\n",
dfid_val, (unsigned long long) offset, count);
dfid = lookup_fid(s, dfid_val);
if (IS_ERR(dfid))
return PTR_ERR(dfid);
if (IS_ERR_OR_NULL(dfid->filp))
return -EBADF;
err = vfs_llseek(dfid->filp, offset, SEEK_SET);
if (err < 0)
return err;
_ctx.parent = &dfid->path;
_ctx.out = out;
_ctx.i = 0;
_ctx.count = count;
_ctx.err = 0;
_ctx.is_root = (dfid->path.dentry == s->root.dentry);
out->size += sizeof(u32); // Make room for count
err = iterate_dir(dfid->filp, &_ctx.ctx);
if (err)
return err;
if (_ctx.err)
return _ctx.err;
// Write the last element
if (_ctx.i)
p9pdu_writef(out, "Qqbs", &_ctx.prev.qid, (u64) _ctx.ctx.pos,
_ctx.prev.d_type, _ctx.prev.name);
out->size = P9_PDU_HDR_LEN;
p9pdu_writef(out, "d", _ctx.i); // Total bytes written
out->size += _ctx.i;
return 0;
}
static int p9_op_read(struct p9_server *s, struct p9_fcall *in,
struct p9_fcall *out)
{
u32 fid_val, count;
u64 offset;
ssize_t len;
struct p9_server_fid *fid;
mm_segment_t fs;
p9pdu_readf(in, "dqd", &fid_val, &offset, &count);
p9s_debug("p9_op_read : fid %d offset %llu count %d\n",
fid_val, (unsigned long long) offset, count);
fid = lookup_fid(s, fid_val);
if (fid->fid_type == P9_FID_XATTR) {
if (count > fid->xattr.len) {
count = fid->xattr.len;
}
p9s_debug("p9_op_read: reading xattr value %d %s\n", count, fid->xattr.value);
memcpy(out->sdata + out->size, fid->xattr.value, count);
out->size += count;
len = count;
} else {
if (IS_ERR(fid))
return PTR_ERR(fid);
if (IS_ERR_OR_NULL(fid->filp))
return -EBADF;
out->size += sizeof(u32);
if (count + out->size > out->capacity)
count = out->capacity - out->size;
fs = get_fs();
set_fs(KERNEL_DS);
len = vfs_read(fid->filp, out->sdata + out->size, count, &offset);
set_fs(fs);
}
if (len < 0)
return len;
out->size = P9_PDU_HDR_LEN;
p9pdu_writef(out, "d", (u32) len);
out->size += len;
return 0;
}
static int p9_op_readv(struct p9_server *s, struct p9_fcall *in,
struct p9_fcall *out, struct iov_iter *data)
{
u32 fid_val, count;
u64 offset;
ssize_t len;
struct p9_server_fid *fid;
mm_segment_t fs;
p9pdu_readf(in, "dqd", &fid_val, &offset, &count);
fid = lookup_fid(s, fid_val);
if (IS_ERR(fid))
return PTR_ERR(fid);
if (IS_ERR_OR_NULL(fid->filp))
return -EBADF;
if (data->count > count)
data->count = count;
fs = get_fs();
set_fs(KERNEL_DS);
len = vfs_iter_read(fid->filp, data, &offset);
set_fs(fs);
if (len < 0)
return len;
p9pdu_writef(out, "d", (u32) len);
out->size += len;
return 0;
}
#define ATTR_MASK 127
static int p9_op_setattr(struct p9_server *s, struct p9_fcall *in,
struct p9_fcall *out)
{
int err = 0;
u32 fid_val;
struct p9_server_fid *fid;
struct p9_iattr_dotl p9attr;
struct iattr iattr;
struct dentry *dentry;
p9pdu_readf(in, "dddugqqqqq", &fid_val,
&p9attr.valid, &p9attr.mode,
&p9attr.uid, &p9attr.gid, &p9attr.size,
&p9attr.atime_sec, &p9attr.atime_nsec,
&p9attr.mtime_sec, &p9attr.mtime_nsec);
p9s_debug("setattr : fid %d, valid %x, mode %x, uid %d, gid %d\n"
"size %lld, at_sec %lld, at_nsec %lld\n"
"mt_sec %lld, mt_nsec %lld\n",
fid_val, p9attr.valid, p9attr.mode,
p9attr.uid.val, p9attr.gid.val, p9attr.size,
p9attr.atime_sec, p9attr.atime_nsec,
p9attr.mtime_sec, p9attr.mtime_nsec);
fid = lookup_fid(s, fid_val);
if (IS_ERR(fid))
return PTR_ERR(fid);
dentry = fid->path.dentry;
memset(&iattr, 0, sizeof(struct iattr));
if (p9attr.valid & ATTR_MODE) {
iattr.ia_valid |= ATTR_MODE | ATTR_CTIME;
iattr.ia_mode = p9attr.mode;
iattr.ia_ctime = current_time(dentry->d_inode);
}
if (p9attr.valid & ATTR_ATIME) {
iattr.ia_valid |= ATTR_ATIME;
if (p9attr.valid & ATTR_ATIME_SET) {
iattr.ia_valid |= ATTR_ATIME_SET;
iattr.ia_atime.tv_sec = p9attr.atime_sec;
iattr.ia_atime.tv_nsec = p9attr.atime_nsec;
} else
iattr.ia_atime.tv_nsec = UTIME_NOW;
} else
iattr.ia_atime.tv_nsec = UTIME_OMIT;
if (p9attr.valid & ATTR_MTIME) {
iattr.ia_valid |= ATTR_MTIME;
if (p9attr.valid & ATTR_MTIME_SET) {
iattr.ia_valid |= ATTR_MTIME_SET;
iattr.ia_mtime.tv_sec = p9attr.mtime_sec;
iattr.ia_mtime.tv_nsec = p9attr.mtime_nsec;
} else
iattr.ia_mtime.tv_nsec = UTIME_NOW;
} else
iattr.ia_mtime.tv_nsec = UTIME_OMIT;
if (p9attr.valid & ATTR_UID) {
iattr.ia_valid |= ATTR_UID;
iattr.ia_uid.val = p9attr.uid.val;
}
if (p9attr.valid & ATTR_GID) {
iattr.ia_valid |= ATTR_GID;
iattr.ia_gid.val = p9attr.gid.val;
}
if (p9attr.valid & ATTR_CTIME) {
iattr.ia_valid |= ATTR_CTIME;
iattr.ia_ctime = current_time(dentry->d_inode);
}
if (iattr.ia_valid) {
inode_lock(dentry->d_inode);
err = notify_change(dentry, &iattr, NULL);
inode_unlock(dentry->d_inode);
if (err < 0)
return err;
}
if (p9attr.valid & ATTR_SIZE) {
err = vfs_truncate(&fid->path, p9attr.size);
if (err < 0)
return err;
}
p9s_debug("setattr : fid %d\n", fid->fid);
return 0;
}
static int p9_op_write(struct p9_server *s, struct p9_fcall *in,
struct p9_fcall *out)
{
u64 offset;
u32 fid_val, count;
ssize_t len;
struct p9_server_fid *fid;
mm_segment_t fs;
int err;
p9pdu_readf(in, "dqd", &fid_val, &offset, &count);
p9s_debug("p9_op_write : fid %d offset %llu count %d\n",
fid_val, (unsigned long long) offset, count);
fid = lookup_fid(s, fid_val);
p9s_debug("p9_op_write:fid->type:%d, fid_val:%d\n",
fid->fid_type, fid_val);
if (fid->fid_type == P9_FID_XATTR) {
memcpy(fid->xattr.value, in->sdata + in->offset, fid->xattr.len);
fid->xattr.value[fid->xattr.len] = '\0';
len = fid->xattr.copied_len = fid->xattr.len;
err = vfs_setxattr(fid->path.dentry,
fid->xattr.name,
fid->xattr.value,
fid->xattr.len,
fid->xattr.flags);
p9s_debug("p9_op_write: wrote value %s, for name %s, err %d\n",
fid->xattr.value, fid->xattr.name, err);
} else {
if (IS_ERR(fid))
return PTR_ERR(fid);
if (IS_ERR_OR_NULL(fid->filp))
return -EBADF;
p9s_debug("p9_op_write: Writing to file\n");
fs = get_fs();
set_fs(KERNEL_DS);
len = vfs_write(fid->filp, in->sdata + in->offset, count, &offset);
set_fs(fs);
}
if (len < 0)
return len;
p9_clear_sugid(s, fid);
p9pdu_writef(out, "d", (u32) len);
p9s_debug("wrote : count %d\n", count);
return 0;
}
static int p9_op_writev(struct p9_server *s, struct p9_fcall *in,
struct p9_fcall *out, struct iov_iter *data)
{
u64 offset;
u32 fid_val, count;
ssize_t len;
struct p9_server_fid *fid;
p9pdu_readf(in, "dqd", &fid_val, &offset, &count);
fid = lookup_fid(s, fid_val);
if (IS_ERR(fid))
return PTR_ERR(fid);
if (IS_ERR_OR_NULL(fid->filp))
return -EBADF;
if (data->count > count)
data->count = count;
len = vfs_iter_write(fid->filp, data, &offset);
if (len < 0)
return len;
p9_clear_sugid(s, fid);
p9pdu_writef(out, "d", (u32) len);
return 0;
}