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qemu/hw/9pfs/virtio-9p.c
Aneesh Kumar K.V 7999f7e127 hw/9pfs: Make VirtFS tracing work correctly 
this patch fix multiple issues with VirtFS tracing.
a) Add tracepoint to the correct code path. We handle error in complete_pdu
b) Fix indentation in python script
c) Fix variable naming issue in python script

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2011-10-30 09:05:28 +00:00

3361 lines
88 KiB
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/*
* Virtio 9p backend
*
* Copyright IBM, Corp. 2010
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#include "hw/virtio.h"
#include "hw/pc.h"
#include "qemu_socket.h"
#include "hw/virtio-pci.h"
#include "virtio-9p.h"
#include "fsdev/qemu-fsdev.h"
#include "virtio-9p-xattr.h"
#include "virtio-9p-coth.h"
#include "trace.h"
int open_fd_hw;
int total_open_fd;
static int open_fd_rc;
enum {
Oread = 0x00,
Owrite = 0x01,
Ordwr = 0x02,
Oexec = 0x03,
Oexcl = 0x04,
Otrunc = 0x10,
Orexec = 0x20,
Orclose = 0x40,
Oappend = 0x80,
};
static int omode_to_uflags(int8_t mode)
{
int ret = 0;
switch (mode & 3) {
case Oread:
ret = O_RDONLY;
break;
case Ordwr:
ret = O_RDWR;
break;
case Owrite:
ret = O_WRONLY;
break;
case Oexec:
ret = O_RDONLY;
break;
}
if (mode & Otrunc) {
ret |= O_TRUNC;
}
if (mode & Oappend) {
ret |= O_APPEND;
}
if (mode & Oexcl) {
ret |= O_EXCL;
}
return ret;
}
static int dotl_to_at_flags(int flags)
{
int rflags = 0;
if (flags & P9_DOTL_AT_REMOVEDIR) {
rflags |= AT_REMOVEDIR;
}
return rflags;
}
struct dotl_openflag_map {
int dotl_flag;
int open_flag;
};
static int dotl_to_open_flags(int flags)
{
int i;
/*
* We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
* and P9_DOTL_NOACCESS
*/
int oflags = flags & O_ACCMODE;
struct dotl_openflag_map dotl_oflag_map[] = {
{ P9_DOTL_CREATE, O_CREAT },
{ P9_DOTL_EXCL, O_EXCL },
{ P9_DOTL_NOCTTY , O_NOCTTY },
{ P9_DOTL_TRUNC, O_TRUNC },
{ P9_DOTL_APPEND, O_APPEND },
{ P9_DOTL_NONBLOCK, O_NONBLOCK } ,
{ P9_DOTL_DSYNC, O_DSYNC },
{ P9_DOTL_FASYNC, FASYNC },
{ P9_DOTL_DIRECT, O_DIRECT },
{ P9_DOTL_LARGEFILE, O_LARGEFILE },
{ P9_DOTL_DIRECTORY, O_DIRECTORY },
{ P9_DOTL_NOFOLLOW, O_NOFOLLOW },
{ P9_DOTL_NOATIME, O_NOATIME },
{ P9_DOTL_SYNC, O_SYNC },
};
for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
if (flags & dotl_oflag_map[i].dotl_flag) {
oflags |= dotl_oflag_map[i].open_flag;
}
}
return oflags;
}
void cred_init(FsCred *credp)
{
credp->fc_uid = -1;
credp->fc_gid = -1;
credp->fc_mode = -1;
credp->fc_rdev = -1;
}
static int get_dotl_openflags(V9fsState *s, int oflags)
{
int flags;
/*
* Filter the client open flags
*/
flags = dotl_to_open_flags(oflags);
flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT);
/*
* Ignore direct disk access hint until the server supports it.
*/
flags &= ~O_DIRECT;
return flags;
}
void v9fs_string_init(V9fsString *str)
{
str->data = NULL;
str->size = 0;
}
void v9fs_string_free(V9fsString *str)
{
g_free(str->data);
str->data = NULL;
str->size = 0;
}
void v9fs_string_null(V9fsString *str)
{
v9fs_string_free(str);
}
static int number_to_string(void *arg, char type)
{
unsigned int ret = 0;
switch (type) {
case 'u': {
unsigned int num = *(unsigned int *)arg;
do {
ret++;
num = num/10;
} while (num);
break;
}
case 'U': {
unsigned long num = *(unsigned long *)arg;
do {
ret++;
num = num/10;
} while (num);
break;
}
default:
printf("Number_to_string: Unknown number format\n");
return -1;
}
return ret;
}
static int GCC_FMT_ATTR(2, 0)
v9fs_string_alloc_printf(char **strp, const char *fmt, va_list ap)
{
va_list ap2;
char *iter = (char *)fmt;
int len = 0;
int nr_args = 0;
char *arg_char_ptr;
unsigned int arg_uint;
unsigned long arg_ulong;
/* Find the number of %'s that denotes an argument */
for (iter = strstr(iter, "%"); iter; iter = strstr(iter, "%")) {
nr_args++;
iter++;
}
len = strlen(fmt) - 2*nr_args;
if (!nr_args) {
goto alloc_print;
}
va_copy(ap2, ap);
iter = (char *)fmt;
/* Now parse the format string */
for (iter = strstr(iter, "%"); iter; iter = strstr(iter, "%")) {
iter++;
switch (*iter) {
case 'u':
arg_uint = va_arg(ap2, unsigned int);
len += number_to_string((void *)&arg_uint, 'u');
break;
case 'l':
if (*++iter == 'u') {
arg_ulong = va_arg(ap2, unsigned long);
len += number_to_string((void *)&arg_ulong, 'U');
} else {
return -1;
}
break;
case 's':
arg_char_ptr = va_arg(ap2, char *);
len += strlen(arg_char_ptr);
break;
case 'c':
len += 1;
break;
default:
fprintf(stderr,
"v9fs_string_alloc_printf:Incorrect format %c", *iter);
return -1;
}
iter++;
}
alloc_print:
*strp = g_malloc((len + 1) * sizeof(**strp));
return vsprintf(*strp, fmt, ap);
}
void GCC_FMT_ATTR(2, 3)
v9fs_string_sprintf(V9fsString *str, const char *fmt, ...)
{
va_list ap;
int err;
v9fs_string_free(str);
va_start(ap, fmt);
err = v9fs_string_alloc_printf(&str->data, fmt, ap);
BUG_ON(err == -1);
va_end(ap);
str->size = err;
}
void v9fs_string_copy(V9fsString *lhs, V9fsString *rhs)
{
v9fs_string_free(lhs);
v9fs_string_sprintf(lhs, "%s", rhs->data);
}
void v9fs_path_init(V9fsPath *path)
{
path->data = NULL;
path->size = 0;
}
void v9fs_path_free(V9fsPath *path)
{
g_free(path->data);
path->data = NULL;
path->size = 0;
}
void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs)
{
v9fs_path_free(lhs);
lhs->data = g_malloc(rhs->size);
memcpy(lhs->data, rhs->data, rhs->size);
lhs->size = rhs->size;
}
int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath,
const char *name, V9fsPath *path)
{
int err;
err = s->ops->name_to_path(&s->ctx, dirpath, name, path);
if (err < 0) {
err = -errno;
}
return err;
}
/*
* Return TRUE if s1 is an ancestor of s2.
*
* E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d".
* As a special case, We treat s1 as ancestor of s2 if they are same!
*/
static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2)
{
if (!strncmp(s1->data, s2->data, s1->size - 1)) {
if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') {
return 1;
}
}
return 0;
}
static size_t v9fs_string_size(V9fsString *str)
{
return str->size;
}
/*
* returns 0 if fid got re-opened, 1 if not, < 0 on error */
static int v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f)
{
int err = 1;
if (f->fid_type == P9_FID_FILE) {
if (f->fs.fd == -1) {
do {
err = v9fs_co_open(pdu, f, f->open_flags);
} while (err == -EINTR && !pdu->cancelled);
}
} else if (f->fid_type == P9_FID_DIR) {
if (f->fs.dir == NULL) {
do {
err = v9fs_co_opendir(pdu, f);
} while (err == -EINTR && !pdu->cancelled);
}
}
return err;
}
static V9fsFidState *get_fid(V9fsPDU *pdu, int32_t fid)
{
int err;
V9fsFidState *f;
V9fsState *s = pdu->s;
for (f = s->fid_list; f; f = f->next) {
BUG_ON(f->clunked);
if (f->fid == fid) {
/*
* Update the fid ref upfront so that
* we don't get reclaimed when we yield
* in open later.
*/
f->ref++;
/*
* check whether we need to reopen the
* file. We might have closed the fd
* while trying to free up some file
* descriptors.
*/
err = v9fs_reopen_fid(pdu, f);
if (err < 0) {
f->ref--;
return NULL;
}
/*
* Mark the fid as referenced so that the LRU
* reclaim won't close the file descriptor
*/
f->flags |= FID_REFERENCED;
return f;
}
}
return NULL;
}
static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid)
{
V9fsFidState *f;
for (f = s->fid_list; f; f = f->next) {
/* If fid is already there return NULL */
BUG_ON(f->clunked);
if (f->fid == fid) {
return NULL;
}
}
f = g_malloc0(sizeof(V9fsFidState));
f->fid = fid;
f->fid_type = P9_FID_NONE;
f->ref = 1;
/*
* Mark the fid as referenced so that the LRU
* reclaim won't close the file descriptor
*/
f->flags |= FID_REFERENCED;
f->next = s->fid_list;
s->fid_list = f;
return f;
}
static int v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp)
{
int retval = 0;
if (fidp->fs.xattr.copied_len == -1) {
/* getxattr/listxattr fid */
goto free_value;
}
/*
* if this is fid for setxattr. clunk should
* result in setxattr localcall
*/
if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) {
/* clunk after partial write */
retval = -EINVAL;
goto free_out;
}
if (fidp->fs.xattr.len) {
retval = v9fs_co_lsetxattr(pdu, &fidp->path, &fidp->fs.xattr.name,
fidp->fs.xattr.value,
fidp->fs.xattr.len,
fidp->fs.xattr.flags);
} else {
retval = v9fs_co_lremovexattr(pdu, &fidp->path, &fidp->fs.xattr.name);
}
free_out:
v9fs_string_free(&fidp->fs.xattr.name);
free_value:
if (fidp->fs.xattr.value) {
g_free(fidp->fs.xattr.value);
}
return retval;
}
static int free_fid(V9fsPDU *pdu, V9fsFidState *fidp)
{
int retval = 0;
if (fidp->fid_type == P9_FID_FILE) {
/* If we reclaimed the fd no need to close */
if (fidp->fs.fd != -1) {
retval = v9fs_co_close(pdu, fidp->fs.fd);
}
} else if (fidp->fid_type == P9_FID_DIR) {
if (fidp->fs.dir != NULL) {
retval = v9fs_co_closedir(pdu, fidp->fs.dir);
}
} else if (fidp->fid_type == P9_FID_XATTR) {
retval = v9fs_xattr_fid_clunk(pdu, fidp);
}
v9fs_path_free(&fidp->path);
g_free(fidp);
return retval;
}
static void put_fid(V9fsPDU *pdu, V9fsFidState *fidp)
{
BUG_ON(!fidp->ref);
fidp->ref--;
/*
* Don't free the fid if it is in reclaim list
*/
if (!fidp->ref && fidp->clunked) {
free_fid(pdu, fidp);
}
}
static V9fsFidState *clunk_fid(V9fsState *s, int32_t fid)
{
V9fsFidState **fidpp, *fidp;
for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) {
if ((*fidpp)->fid == fid) {
break;
}
}
if (*fidpp == NULL) {
return NULL;
}
fidp = *fidpp;
*fidpp = fidp->next;
fidp->clunked = 1;
return fidp;
}
void v9fs_reclaim_fd(V9fsPDU *pdu)
{
int reclaim_count = 0;
V9fsState *s = pdu->s;
V9fsFidState *f, *reclaim_list = NULL;
for (f = s->fid_list; f; f = f->next) {
/*
* Unlink fids cannot be reclaimed. Check
* for them and skip them. Also skip fids
* currently being operated on.
*/
if (f->ref || f->flags & FID_NON_RECLAIMABLE) {
continue;
}
/*
* if it is a recently referenced fid
* we leave the fid untouched and clear the
* reference bit. We come back to it later
* in the next iteration. (a simple LRU without
* moving list elements around)
*/
if (f->flags & FID_REFERENCED) {
f->flags &= ~FID_REFERENCED;
continue;
}
/*
* Add fids to reclaim list.
*/
if (f->fid_type == P9_FID_FILE) {
if (f->fs.fd != -1) {
/*
* Up the reference count so that
* a clunk request won't free this fid
*/
f->ref++;
f->rclm_lst = reclaim_list;
reclaim_list = f;
f->fs_reclaim.fd = f->fs.fd;
f->fs.fd = -1;
reclaim_count++;
}
} else if (f->fid_type == P9_FID_DIR) {
if (f->fs.dir != NULL) {
/*
* Up the reference count so that
* a clunk request won't free this fid
*/
f->ref++;
f->rclm_lst = reclaim_list;
reclaim_list = f;
f->fs_reclaim.dir = f->fs.dir;
f->fs.dir = NULL;
reclaim_count++;
}
}
if (reclaim_count >= open_fd_rc) {
break;
}
}
/*
* Now close the fid in reclaim list. Free them if they
* are already clunked.
*/
while (reclaim_list) {
f = reclaim_list;
reclaim_list = f->rclm_lst;
if (f->fid_type == P9_FID_FILE) {
v9fs_co_close(pdu, f->fs_reclaim.fd);
} else if (f->fid_type == P9_FID_DIR) {
v9fs_co_closedir(pdu, f->fs_reclaim.dir);
}
f->rclm_lst = NULL;
/*
* Now drop the fid reference, free it
* if clunked.
*/
put_fid(pdu, f);
}
}
static int v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path)
{
int err;
V9fsState *s = pdu->s;
V9fsFidState *fidp, head_fid;
head_fid.next = s->fid_list;
for (fidp = s->fid_list; fidp; fidp = fidp->next) {
if (fidp->path.size != path->size) {
continue;
}
if (!memcmp(fidp->path.data, path->data, path->size)) {
/* Mark the fid non reclaimable. */
fidp->flags |= FID_NON_RECLAIMABLE;
/* reopen the file/dir if already closed */
err = v9fs_reopen_fid(pdu, fidp);
if (err < 0) {
return -1;
}
/*
* Go back to head of fid list because
* the list could have got updated when
* switched to the worker thread
*/
if (err == 0) {
fidp = &head_fid;
}
}
}
return 0;
}
#define P9_QID_TYPE_DIR 0x80
#define P9_QID_TYPE_SYMLINK 0x02
#define P9_STAT_MODE_DIR 0x80000000
#define P9_STAT_MODE_APPEND 0x40000000
#define P9_STAT_MODE_EXCL 0x20000000
#define P9_STAT_MODE_MOUNT 0x10000000
#define P9_STAT_MODE_AUTH 0x08000000
#define P9_STAT_MODE_TMP 0x04000000
#define P9_STAT_MODE_SYMLINK 0x02000000
#define P9_STAT_MODE_LINK 0x01000000
#define P9_STAT_MODE_DEVICE 0x00800000
#define P9_STAT_MODE_NAMED_PIPE 0x00200000
#define P9_STAT_MODE_SOCKET 0x00100000
#define P9_STAT_MODE_SETUID 0x00080000
#define P9_STAT_MODE_SETGID 0x00040000
#define P9_STAT_MODE_SETVTX 0x00010000
#define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \
P9_STAT_MODE_SYMLINK | \
P9_STAT_MODE_LINK | \
P9_STAT_MODE_DEVICE | \
P9_STAT_MODE_NAMED_PIPE | \
P9_STAT_MODE_SOCKET)
/* This is the algorithm from ufs in spfs */
static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp)
{
size_t size;
memset(&qidp->path, 0, sizeof(qidp->path));
size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path));
memcpy(&qidp->path, &stbuf->st_ino, size);
qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8);
qidp->type = 0;
if (S_ISDIR(stbuf->st_mode)) {
qidp->type |= P9_QID_TYPE_DIR;
}
if (S_ISLNK(stbuf->st_mode)) {
qidp->type |= P9_QID_TYPE_SYMLINK;
}
}
static int fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp, V9fsQID *qidp)
{
struct stat stbuf;
int err;
err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
if (err < 0) {
return err;
}
stat_to_qid(&stbuf, qidp);
return 0;
}
static V9fsPDU *alloc_pdu(V9fsState *s)
{
V9fsPDU *pdu = NULL;
if (!QLIST_EMPTY(&s->free_list)) {
pdu = QLIST_FIRST(&s->free_list);
QLIST_REMOVE(pdu, next);
QLIST_INSERT_HEAD(&s->active_list, pdu, next);
}
return pdu;
}
static void free_pdu(V9fsState *s, V9fsPDU *pdu)
{
if (pdu) {
/*
* Cancelled pdu are added back to the freelist
* by flush request .
*/
if (!pdu->cancelled) {
QLIST_REMOVE(pdu, next);
QLIST_INSERT_HEAD(&s->free_list, pdu, next);
}
}
}
size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count,
size_t offset, size_t size, int pack)
{
int i = 0;
size_t copied = 0;
for (i = 0; size && i < sg_count; i++) {
size_t len;
if (offset >= sg[i].iov_len) {
/* skip this sg */
offset -= sg[i].iov_len;
continue;
} else {
len = MIN(sg[i].iov_len - offset, size);
if (pack) {
memcpy(sg[i].iov_base + offset, addr, len);
} else {
memcpy(addr, sg[i].iov_base + offset, len);
}
size -= len;
copied += len;
addr += len;
if (size) {
offset = 0;
continue;
}
}
}
return copied;
}
static size_t pdu_unpack(void *dst, V9fsPDU *pdu, size_t offset, size_t size)
{
return pdu_packunpack(dst, pdu->elem.out_sg, pdu->elem.out_num,
offset, size, 0);
}
static size_t pdu_pack(V9fsPDU *pdu, size_t offset, const void *src,
size_t size)
{
return pdu_packunpack((void *)src, pdu->elem.in_sg, pdu->elem.in_num,
offset, size, 1);
}
static int pdu_copy_sg(V9fsPDU *pdu, size_t offset, int rx, struct iovec *sg)
{
size_t pos = 0;
int i, j;
struct iovec *src_sg;
unsigned int num;
if (rx) {
src_sg = pdu->elem.in_sg;
num = pdu->elem.in_num;
} else {
src_sg = pdu->elem.out_sg;
num = pdu->elem.out_num;
}
j = 0;
for (i = 0; i < num; i++) {
if (offset <= pos) {
sg[j].iov_base = src_sg[i].iov_base;
sg[j].iov_len = src_sg[i].iov_len;
j++;
} else if (offset < (src_sg[i].iov_len + pos)) {
sg[j].iov_base = src_sg[i].iov_base;
sg[j].iov_len = src_sg[i].iov_len;
sg[j].iov_base += (offset - pos);
sg[j].iov_len -= (offset - pos);
j++;
}
pos += src_sg[i].iov_len;
}
return j;
}
static size_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
{
size_t old_offset = offset;
va_list ap;
int i;
va_start(ap, fmt);
for (i = 0; fmt[i]; i++) {
switch (fmt[i]) {
case 'b': {
uint8_t *valp = va_arg(ap, uint8_t *);
offset += pdu_unpack(valp, pdu, offset, sizeof(*valp));
break;
}
case 'w': {
uint16_t val, *valp;
valp = va_arg(ap, uint16_t *);
offset += pdu_unpack(&val, pdu, offset, sizeof(val));
*valp = le16_to_cpu(val);
break;
}
case 'd': {
uint32_t val, *valp;
valp = va_arg(ap, uint32_t *);
offset += pdu_unpack(&val, pdu, offset, sizeof(val));
*valp = le32_to_cpu(val);
break;
}
case 'q': {
uint64_t val, *valp;
valp = va_arg(ap, uint64_t *);
offset += pdu_unpack(&val, pdu, offset, sizeof(val));
*valp = le64_to_cpu(val);
break;
}
case 'v': {
struct iovec *iov = va_arg(ap, struct iovec *);
int *iovcnt = va_arg(ap, int *);
*iovcnt = pdu_copy_sg(pdu, offset, 0, iov);
break;
}
case 's': {
V9fsString *str = va_arg(ap, V9fsString *);
offset += pdu_unmarshal(pdu, offset, "w", &str->size);
/* FIXME: sanity check str->size */
str->data = g_malloc(str->size + 1);
offset += pdu_unpack(str->data, pdu, offset, str->size);
str->data[str->size] = 0;
break;
}
case 'Q': {
V9fsQID *qidp = va_arg(ap, V9fsQID *);
offset += pdu_unmarshal(pdu, offset, "bdq",
&qidp->type, &qidp->version, &qidp->path);
break;
}
case 'S': {
V9fsStat *statp = va_arg(ap, V9fsStat *);
offset += pdu_unmarshal(pdu, offset, "wwdQdddqsssssddd",
&statp->size, &statp->type, &statp->dev,
&statp->qid, &statp->mode, &statp->atime,
&statp->mtime, &statp->length,
&statp->name, &statp->uid, &statp->gid,
&statp->muid, &statp->extension,
&statp->n_uid, &statp->n_gid,
&statp->n_muid);
break;
}
case 'I': {
V9fsIattr *iattr = va_arg(ap, V9fsIattr *);
offset += pdu_unmarshal(pdu, offset, "ddddqqqqq",
&iattr->valid, &iattr->mode,
&iattr->uid, &iattr->gid, &iattr->size,
&iattr->atime_sec, &iattr->atime_nsec,
&iattr->mtime_sec, &iattr->mtime_nsec);
break;
}
default:
break;
}
}
va_end(ap);
return offset - old_offset;
}
static size_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
{
size_t old_offset = offset;
va_list ap;
int i;
va_start(ap, fmt);
for (i = 0; fmt[i]; i++) {
switch (fmt[i]) {
case 'b': {
uint8_t val = va_arg(ap, int);
offset += pdu_pack(pdu, offset, &val, sizeof(val));
break;
}
case 'w': {
uint16_t val;
cpu_to_le16w(&val, va_arg(ap, int));
offset += pdu_pack(pdu, offset, &val, sizeof(val));
break;
}
case 'd': {
uint32_t val;
cpu_to_le32w(&val, va_arg(ap, uint32_t));
offset += pdu_pack(pdu, offset, &val, sizeof(val));
break;
}
case 'q': {
uint64_t val;
cpu_to_le64w(&val, va_arg(ap, uint64_t));
offset += pdu_pack(pdu, offset, &val, sizeof(val));
break;
}
case 'v': {
struct iovec *iov = va_arg(ap, struct iovec *);
int *iovcnt = va_arg(ap, int *);
*iovcnt = pdu_copy_sg(pdu, offset, 1, iov);
break;
}
case 's': {
V9fsString *str = va_arg(ap, V9fsString *);
offset += pdu_marshal(pdu, offset, "w", str->size);
offset += pdu_pack(pdu, offset, str->data, str->size);
break;
}
case 'Q': {
V9fsQID *qidp = va_arg(ap, V9fsQID *);
offset += pdu_marshal(pdu, offset, "bdq",
qidp->type, qidp->version, qidp->path);
break;
}
case 'S': {
V9fsStat *statp = va_arg(ap, V9fsStat *);
offset += pdu_marshal(pdu, offset, "wwdQdddqsssssddd",
statp->size, statp->type, statp->dev,
&statp->qid, statp->mode, statp->atime,
statp->mtime, statp->length, &statp->name,
&statp->uid, &statp->gid, &statp->muid,
&statp->extension, statp->n_uid,
statp->n_gid, statp->n_muid);
break;
}
case 'A': {
V9fsStatDotl *statp = va_arg(ap, V9fsStatDotl *);
offset += pdu_marshal(pdu, offset, "qQdddqqqqqqqqqqqqqqq",
statp->st_result_mask,
&statp->qid, statp->st_mode,
statp->st_uid, statp->st_gid,
statp->st_nlink, statp->st_rdev,
statp->st_size, statp->st_blksize, statp->st_blocks,
statp->st_atime_sec, statp->st_atime_nsec,
statp->st_mtime_sec, statp->st_mtime_nsec,
statp->st_ctime_sec, statp->st_ctime_nsec,
statp->st_btime_sec, statp->st_btime_nsec,
statp->st_gen, statp->st_data_version);
break;
}
default:
break;
}
}
va_end(ap);
return offset - old_offset;
}
static void complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len)
{
int8_t id = pdu->id + 1; /* Response */
if (len < 0) {
int err = -len;
len = 7;
if (s->proto_version != V9FS_PROTO_2000L) {
V9fsString str;
str.data = strerror(err);
str.size = strlen(str.data);
len += pdu_marshal(pdu, len, "s", &str);
id = P9_RERROR;
}
len += pdu_marshal(pdu, len, "d", err);
if (s->proto_version == V9FS_PROTO_2000L) {
id = P9_RLERROR;
}
trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */
}
/* fill out the header */
pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag);
/* keep these in sync */
pdu->size = len;
pdu->id = id;
/* push onto queue and notify */
virtqueue_push(s->vq, &pdu->elem, len);
/* FIXME: we should batch these completions */
virtio_notify(&s->vdev, s->vq);
/* Now wakeup anybody waiting in flush for this request */
qemu_co_queue_next(&pdu->complete);
free_pdu(s, pdu);
}
static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension)
{
mode_t ret;
ret = mode & 0777;
if (mode & P9_STAT_MODE_DIR) {
ret |= S_IFDIR;
}
if (mode & P9_STAT_MODE_SYMLINK) {
ret |= S_IFLNK;
}
if (mode & P9_STAT_MODE_SOCKET) {
ret |= S_IFSOCK;
}
if (mode & P9_STAT_MODE_NAMED_PIPE) {
ret |= S_IFIFO;
}
if (mode & P9_STAT_MODE_DEVICE) {
if (extension && extension->data[0] == 'c') {
ret |= S_IFCHR;
} else {
ret |= S_IFBLK;
}
}
if (!(ret&~0777)) {
ret |= S_IFREG;
}
if (mode & P9_STAT_MODE_SETUID) {
ret |= S_ISUID;
}
if (mode & P9_STAT_MODE_SETGID) {
ret |= S_ISGID;
}
if (mode & P9_STAT_MODE_SETVTX) {
ret |= S_ISVTX;
}
return ret;
}
static int donttouch_stat(V9fsStat *stat)
{
if (stat->type == -1 &&
stat->dev == -1 &&
stat->qid.type == -1 &&
stat->qid.version == -1 &&
stat->qid.path == -1 &&
stat->mode == -1 &&
stat->atime == -1 &&
stat->mtime == -1 &&
stat->length == -1 &&
!stat->name.size &&
!stat->uid.size &&
!stat->gid.size &&
!stat->muid.size &&
stat->n_uid == -1 &&
stat->n_gid == -1 &&
stat->n_muid == -1) {
return 1;
}
return 0;
}
static void v9fs_stat_free(V9fsStat *stat)
{
v9fs_string_free(&stat->name);
v9fs_string_free(&stat->uid);
v9fs_string_free(&stat->gid);
v9fs_string_free(&stat->muid);
v9fs_string_free(&stat->extension);
}
static uint32_t stat_to_v9mode(const struct stat *stbuf)
{
uint32_t mode;
mode = stbuf->st_mode & 0777;
if (S_ISDIR(stbuf->st_mode)) {
mode |= P9_STAT_MODE_DIR;
}
if (S_ISLNK(stbuf->st_mode)) {
mode |= P9_STAT_MODE_SYMLINK;
}
if (S_ISSOCK(stbuf->st_mode)) {
mode |= P9_STAT_MODE_SOCKET;
}
if (S_ISFIFO(stbuf->st_mode)) {
mode |= P9_STAT_MODE_NAMED_PIPE;
}
if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) {
mode |= P9_STAT_MODE_DEVICE;
}
if (stbuf->st_mode & S_ISUID) {
mode |= P9_STAT_MODE_SETUID;
}
if (stbuf->st_mode & S_ISGID) {
mode |= P9_STAT_MODE_SETGID;
}
if (stbuf->st_mode & S_ISVTX) {
mode |= P9_STAT_MODE_SETVTX;
}
return mode;
}
static int stat_to_v9stat(V9fsPDU *pdu, V9fsPath *name,
const struct stat *stbuf,
V9fsStat *v9stat)
{
int err;
const char *str;
memset(v9stat, 0, sizeof(*v9stat));
stat_to_qid(stbuf, &v9stat->qid);
v9stat->mode = stat_to_v9mode(stbuf);
v9stat->atime = stbuf->st_atime;
v9stat->mtime = stbuf->st_mtime;
v9stat->length = stbuf->st_size;
v9fs_string_null(&v9stat->uid);
v9fs_string_null(&v9stat->gid);
v9fs_string_null(&v9stat->muid);
v9stat->n_uid = stbuf->st_uid;
v9stat->n_gid = stbuf->st_gid;
v9stat->n_muid = 0;
v9fs_string_null(&v9stat->extension);
if (v9stat->mode & P9_STAT_MODE_SYMLINK) {
err = v9fs_co_readlink(pdu, name, &v9stat->extension);
if (err < 0) {
return err;
}
} else if (v9stat->mode & P9_STAT_MODE_DEVICE) {
v9fs_string_sprintf(&v9stat->extension, "%c %u %u",
S_ISCHR(stbuf->st_mode) ? 'c' : 'b',
major(stbuf->st_rdev), minor(stbuf->st_rdev));
} else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) {
v9fs_string_sprintf(&v9stat->extension, "%s %lu",
"HARDLINKCOUNT", (unsigned long)stbuf->st_nlink);
}
str = strrchr(name->data, '/');
if (str) {
str += 1;
} else {
str = name->data;
}
v9fs_string_sprintf(&v9stat->name, "%s", str);
v9stat->size = 61 +
v9fs_string_size(&v9stat->name) +
v9fs_string_size(&v9stat->uid) +
v9fs_string_size(&v9stat->gid) +
v9fs_string_size(&v9stat->muid) +
v9fs_string_size(&v9stat->extension);
return 0;
}
#define P9_STATS_MODE 0x00000001ULL
#define P9_STATS_NLINK 0x00000002ULL
#define P9_STATS_UID 0x00000004ULL
#define P9_STATS_GID 0x00000008ULL
#define P9_STATS_RDEV 0x00000010ULL
#define P9_STATS_ATIME 0x00000020ULL
#define P9_STATS_MTIME 0x00000040ULL
#define P9_STATS_CTIME 0x00000080ULL
#define P9_STATS_INO 0x00000100ULL
#define P9_STATS_SIZE 0x00000200ULL
#define P9_STATS_BLOCKS 0x00000400ULL
#define P9_STATS_BTIME 0x00000800ULL
#define P9_STATS_GEN 0x00001000ULL
#define P9_STATS_DATA_VERSION 0x00002000ULL
#define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */
#define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */
static void stat_to_v9stat_dotl(V9fsState *s, const struct stat *stbuf,
V9fsStatDotl *v9lstat)
{
memset(v9lstat, 0, sizeof(*v9lstat));
v9lstat->st_mode = stbuf->st_mode;
v9lstat->st_nlink = stbuf->st_nlink;
v9lstat->st_uid = stbuf->st_uid;
v9lstat->st_gid = stbuf->st_gid;
v9lstat->st_rdev = stbuf->st_rdev;
v9lstat->st_size = stbuf->st_size;
v9lstat->st_blksize = stbuf->st_blksize;
v9lstat->st_blocks = stbuf->st_blocks;
v9lstat->st_atime_sec = stbuf->st_atime;
v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec;
v9lstat->st_mtime_sec = stbuf->st_mtime;
v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec;
v9lstat->st_ctime_sec = stbuf->st_ctime;
v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec;
/* Currently we only support BASIC fields in stat */
v9lstat->st_result_mask = P9_STATS_BASIC;
stat_to_qid(stbuf, &v9lstat->qid);
}
static struct iovec *adjust_sg(struct iovec *sg, int len, int *iovcnt)
{
while (len && *iovcnt) {
if (len < sg->iov_len) {
sg->iov_len -= len;
sg->iov_base += len;
len = 0;
} else {
len -= sg->iov_len;
sg++;
*iovcnt -= 1;
}
}
return sg;
}
static struct iovec *cap_sg(struct iovec *sg, int cap, int *cnt)
{
int i;
int total = 0;
for (i = 0; i < *cnt; i++) {
if ((total + sg[i].iov_len) > cap) {
sg[i].iov_len -= ((total + sg[i].iov_len) - cap);
i++;
break;
}
total += sg[i].iov_len;
}
*cnt = i;
return sg;
}
static void print_sg(struct iovec *sg, int cnt)
{
int i;
printf("sg[%d]: {", cnt);
for (i = 0; i < cnt; i++) {
if (i) {
printf(", ");
}
printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len);
}
printf("}\n");
}
/* Will call this only for path name based fid */
static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len)
{
V9fsPath str;
v9fs_path_init(&str);
v9fs_path_copy(&str, dst);
v9fs_string_sprintf((V9fsString *)dst, "%s%s", src->data, str.data+len);
v9fs_path_free(&str);
/* +1 to include terminating NULL */
dst->size++;
}
static void v9fs_version(void *opaque)
{
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
V9fsString version;
size_t offset = 7;
pdu_unmarshal(pdu, offset, "ds", &s->msize, &version);
trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data);
if (!strcmp(version.data, "9P2000.u")) {
s->proto_version = V9FS_PROTO_2000U;
} else if (!strcmp(version.data, "9P2000.L")) {
s->proto_version = V9FS_PROTO_2000L;
} else {
v9fs_string_sprintf(&version, "unknown");
}
offset += pdu_marshal(pdu, offset, "ds", s->msize, &version);
trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data);
complete_pdu(s, pdu, offset);
v9fs_string_free(&version);
return;
}
static void v9fs_attach(void *opaque)
{
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
int32_t fid, afid, n_uname;
V9fsString uname, aname;
V9fsFidState *fidp;
size_t offset = 7;
V9fsQID qid;
ssize_t err;
pdu_unmarshal(pdu, offset, "ddssd", &fid, &afid, &uname, &aname, &n_uname);
trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data);
fidp = alloc_fid(s, fid);
if (fidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
fidp->uid = n_uname;
err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path);
if (err < 0) {
err = -EINVAL;
clunk_fid(s, fid);
goto out;
}
err = fid_to_qid(pdu, fidp, &qid);
if (err < 0) {
err = -EINVAL;
clunk_fid(s, fid);
goto out;
}
offset += pdu_marshal(pdu, offset, "Q", &qid);
err = offset;
trace_v9fs_attach_return(pdu->tag, pdu->id,
qid.type, qid.version, qid.path);
out:
put_fid(pdu, fidp);
out_nofid:
complete_pdu(s, pdu, err);
v9fs_string_free(&uname);
v9fs_string_free(&aname);
}
static void v9fs_stat(void *opaque)
{
int32_t fid;
V9fsStat v9stat;
ssize_t err = 0;
size_t offset = 7;
struct stat stbuf;
V9fsFidState *fidp;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
pdu_unmarshal(pdu, offset, "d", &fid);
trace_v9fs_stat(pdu->tag, pdu->id, fid);
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
if (err < 0) {
goto out;
}
err = stat_to_v9stat(pdu, &fidp->path, &stbuf, &v9stat);
if (err < 0) {
goto out;
}
offset += pdu_marshal(pdu, offset, "wS", 0, &v9stat);
err = offset;
trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode,
v9stat.atime, v9stat.mtime, v9stat.length);
v9fs_stat_free(&v9stat);
out:
put_fid(pdu, fidp);
out_nofid:
complete_pdu(s, pdu, err);
}
static void v9fs_getattr(void *opaque)
{
int32_t fid;
size_t offset = 7;
ssize_t retval = 0;
struct stat stbuf;
V9fsFidState *fidp;
uint64_t request_mask;
V9fsStatDotl v9stat_dotl;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask);
trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask);
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
retval = -ENOENT;
goto out_nofid;
}
/*
* Currently we only support BASIC fields in stat, so there is no
* need to look at request_mask.
*/
retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
if (retval < 0) {
goto out;
}
stat_to_v9stat_dotl(s, &stbuf, &v9stat_dotl);
/* fill st_gen if requested and supported by underlying fs */
if (request_mask & P9_STATS_GEN) {
retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl);
if (retval < 0) {
goto out;
}
v9stat_dotl.st_result_mask |= P9_STATS_GEN;
}
retval = offset;
retval += pdu_marshal(pdu, offset, "A", &v9stat_dotl);
trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask,
v9stat_dotl.st_mode, v9stat_dotl.st_uid,
v9stat_dotl.st_gid);
out:
put_fid(pdu, fidp);
out_nofid:
complete_pdu(s, pdu, retval);
}
/* From Linux kernel code */
#define ATTR_MODE (1 << 0)
#define ATTR_UID (1 << 1)
#define ATTR_GID (1 << 2)
#define ATTR_SIZE (1 << 3)
#define ATTR_ATIME (1 << 4)
#define ATTR_MTIME (1 << 5)
#define ATTR_CTIME (1 << 6)
#define ATTR_MASK 127
#define ATTR_ATIME_SET (1 << 7)
#define ATTR_MTIME_SET (1 << 8)
static void v9fs_setattr(void *opaque)
{
int err = 0;
int32_t fid;
V9fsFidState *fidp;
size_t offset = 7;
V9fsIattr v9iattr;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr);
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
if (v9iattr.valid & ATTR_MODE) {
err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode);
if (err < 0) {
goto out;
}
}
if (v9iattr.valid & (ATTR_ATIME | ATTR_MTIME)) {
struct timespec times[2];
if (v9iattr.valid & ATTR_ATIME) {
if (v9iattr.valid & ATTR_ATIME_SET) {
times[0].tv_sec = v9iattr.atime_sec;
times[0].tv_nsec = v9iattr.atime_nsec;
} else {
times[0].tv_nsec = UTIME_NOW;
}
} else {
times[0].tv_nsec = UTIME_OMIT;
}
if (v9iattr.valid & ATTR_MTIME) {
if (v9iattr.valid & ATTR_MTIME_SET) {
times[1].tv_sec = v9iattr.mtime_sec;
times[1].tv_nsec = v9iattr.mtime_nsec;
} else {
times[1].tv_nsec = UTIME_NOW;
}
} else {
times[1].tv_nsec = UTIME_OMIT;
}
err = v9fs_co_utimensat(pdu, &fidp->path, times);
if (err < 0) {
goto out;
}
}
/*
* If the only valid entry in iattr is ctime we can call
* chown(-1,-1) to update the ctime of the file
*/
if ((v9iattr.valid & (ATTR_UID | ATTR_GID)) ||
((v9iattr.valid & ATTR_CTIME)
&& !((v9iattr.valid & ATTR_MASK) & ~ATTR_CTIME))) {
if (!(v9iattr.valid & ATTR_UID)) {
v9iattr.uid = -1;
}
if (!(v9iattr.valid & ATTR_GID)) {
v9iattr.gid = -1;
}
err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid,
v9iattr.gid);
if (err < 0) {
goto out;
}
}
if (v9iattr.valid & (ATTR_SIZE)) {
err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size);
if (err < 0) {
goto out;
}
}
err = offset;
out:
put_fid(pdu, fidp);
out_nofid:
complete_pdu(s, pdu, err);
}
static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids)
{
int i;
size_t offset = 7;
offset += pdu_marshal(pdu, offset, "w", nwnames);
for (i = 0; i < nwnames; i++) {
offset += pdu_marshal(pdu, offset, "Q", &qids[i]);
}
return offset;
}
static void v9fs_walk(void *opaque)
{
int name_idx;
V9fsQID *qids = NULL;
int i, err = 0;
V9fsPath dpath, path;
uint16_t nwnames;
struct stat stbuf;
size_t offset = 7;
int32_t fid, newfid;
V9fsString *wnames = NULL;
V9fsFidState *fidp;
V9fsFidState *newfidp = NULL;;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
offset += pdu_unmarshal(pdu, offset, "ddw", &fid,
&newfid, &nwnames);
trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames);
if (nwnames && nwnames <= P9_MAXWELEM) {
wnames = g_malloc0(sizeof(wnames[0]) * nwnames);
qids = g_malloc0(sizeof(qids[0]) * nwnames);
for (i = 0; i < nwnames; i++) {
offset += pdu_unmarshal(pdu, offset, "s", &wnames[i]);
}
} else if (nwnames > P9_MAXWELEM) {
err = -EINVAL;
goto out_nofid;
}
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
v9fs_path_init(&dpath);
v9fs_path_init(&path);
/*
* Both dpath and path initially poin to fidp.
* Needed to handle request with nwnames == 0
*/
v9fs_path_copy(&dpath, &fidp->path);
v9fs_path_copy(&path, &fidp->path);
for (name_idx = 0; name_idx < nwnames; name_idx++) {
err = v9fs_co_name_to_path(pdu, &dpath, wnames[name_idx].data, &path);
if (err < 0) {
goto out;
}
err = v9fs_co_lstat(pdu, &path, &stbuf);
if (err < 0) {
goto out;
}
stat_to_qid(&stbuf, &qids[name_idx]);
v9fs_path_copy(&dpath, &path);
}
if (fid == newfid) {
BUG_ON(fidp->fid_type != P9_FID_NONE);
v9fs_path_copy(&fidp->path, &path);
} else {
newfidp = alloc_fid(s, newfid);
if (newfidp == NULL) {
err = -EINVAL;
goto out;
}
newfidp->uid = fidp->uid;
v9fs_path_copy(&newfidp->path, &path);
}
err = v9fs_walk_marshal(pdu, nwnames, qids);
trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids);
out:
put_fid(pdu, fidp);
if (newfidp) {
put_fid(pdu, newfidp);
}
v9fs_path_free(&dpath);
v9fs_path_free(&path);
out_nofid:
complete_pdu(s, pdu, err);
if (nwnames && nwnames <= P9_MAXWELEM) {
for (name_idx = 0; name_idx < nwnames; name_idx++) {
v9fs_string_free(&wnames[name_idx]);
}
g_free(wnames);
g_free(qids);
}
return;
}
static int32_t get_iounit(V9fsPDU *pdu, V9fsPath *path)
{
struct statfs stbuf;
int32_t iounit = 0;
V9fsState *s = pdu->s;
/*
* iounit should be multiples of f_bsize (host filesystem block size
* and as well as less than (client msize - P9_IOHDRSZ))
*/
if (!v9fs_co_statfs(pdu, path, &stbuf)) {
iounit = stbuf.f_bsize;
iounit *= (s->msize - P9_IOHDRSZ)/stbuf.f_bsize;
}
if (!iounit) {
iounit = s->msize - P9_IOHDRSZ;
}
return iounit;
}
static void v9fs_open(void *opaque)
{
int flags;
int32_t fid;
int32_t mode;
V9fsQID qid;
int iounit = 0;
ssize_t err = 0;
size_t offset = 7;
struct stat stbuf;
V9fsFidState *fidp;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
if (s->proto_version == V9FS_PROTO_2000L) {
pdu_unmarshal(pdu, offset, "dd", &fid, &mode);
} else {
pdu_unmarshal(pdu, offset, "db", &fid, &mode);
}
trace_v9fs_open(pdu->tag, pdu->id, fid, mode);
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
BUG_ON(fidp->fid_type != P9_FID_NONE);
err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
if (err < 0) {
goto out;
}
stat_to_qid(&stbuf, &qid);
if (S_ISDIR(stbuf.st_mode)) {
err = v9fs_co_opendir(pdu, fidp);
if (err < 0) {
goto out;
}
fidp->fid_type = P9_FID_DIR;
offset += pdu_marshal(pdu, offset, "Qd", &qid, 0);
err = offset;
} else {
if (s->proto_version == V9FS_PROTO_2000L) {
flags = get_dotl_openflags(s, mode);
} else {
flags = omode_to_uflags(mode);
}
err = v9fs_co_open(pdu, fidp, flags);
if (err < 0) {
goto out;
}
fidp->fid_type = P9_FID_FILE;
fidp->open_flags = flags;
if (flags & O_EXCL) {
/*
* We let the host file system do O_EXCL check
* We should not reclaim such fd
*/
fidp->flags |= FID_NON_RECLAIMABLE;
}
iounit = get_iounit(pdu, &fidp->path);
offset += pdu_marshal(pdu, offset, "Qd", &qid, iounit);
err = offset;
}
trace_v9fs_open_return(pdu->tag, pdu->id,
qid.type, qid.version, qid.path, iounit);
out:
put_fid(pdu, fidp);
out_nofid:
complete_pdu(s, pdu, err);
}
static void v9fs_lcreate(void *opaque)
{
int32_t dfid, flags, mode;
gid_t gid;
ssize_t err = 0;
ssize_t offset = 7;
V9fsString name;
V9fsFidState *fidp;
struct stat stbuf;
V9fsQID qid;
int32_t iounit;
V9fsPDU *pdu = opaque;
pdu_unmarshal(pdu, offset, "dsddd", &dfid, &name, &flags,
&mode, &gid);
trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid);
fidp = get_fid(pdu, dfid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
flags = get_dotl_openflags(pdu->s, flags);
err = v9fs_co_open2(pdu, fidp, &name, gid,
flags | O_CREAT, mode, &stbuf);
if (err < 0) {
goto out;
}
fidp->fid_type = P9_FID_FILE;
fidp->open_flags = flags;
if (flags & O_EXCL) {
/*
* We let the host file system do O_EXCL check
* We should not reclaim such fd
*/
fidp->flags |= FID_NON_RECLAIMABLE;
}
iounit = get_iounit(pdu, &fidp->path);
stat_to_qid(&stbuf, &qid);
offset += pdu_marshal(pdu, offset, "Qd", &qid, iounit);
err = offset;
trace_v9fs_lcreate_return(pdu->tag, pdu->id,
qid.type, qid.version, qid.path, iounit);
out:
put_fid(pdu, fidp);
out_nofid:
complete_pdu(pdu->s, pdu, err);
v9fs_string_free(&name);
}
static void v9fs_fsync(void *opaque)
{
int err;
int32_t fid;
int datasync;
size_t offset = 7;
V9fsFidState *fidp;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
pdu_unmarshal(pdu, offset, "dd", &fid, &datasync);
trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync);
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
err = v9fs_co_fsync(pdu, fidp, datasync);
if (!err) {
err = offset;
}
put_fid(pdu, fidp);
out_nofid:
complete_pdu(s, pdu, err);
}
static void v9fs_clunk(void *opaque)
{
int err;
int32_t fid;
size_t offset = 7;
V9fsFidState *fidp;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
pdu_unmarshal(pdu, offset, "d", &fid);
trace_v9fs_clunk(pdu->tag, pdu->id, fid);
fidp = clunk_fid(s, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
/*
* Bump the ref so that put_fid will
* free the fid.
*/
fidp->ref++;
err = offset;
put_fid(pdu, fidp);
out_nofid:
complete_pdu(s, pdu, err);
}
static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu,
V9fsFidState *fidp, int64_t off, int32_t max_count)
{
size_t offset = 7;
int read_count;
int64_t xattr_len;
xattr_len = fidp->fs.xattr.len;
read_count = xattr_len - off;
if (read_count > max_count) {
read_count = max_count;
} else if (read_count < 0) {
/*
* read beyond XATTR value
*/
read_count = 0;
}
offset += pdu_marshal(pdu, offset, "d", read_count);
offset += pdu_pack(pdu, offset,
((char *)fidp->fs.xattr.value) + off,
read_count);
return offset;
}
static int v9fs_do_readdir_with_stat(V9fsPDU *pdu,
V9fsFidState *fidp, int32_t max_count)
{
V9fsPath path;
V9fsStat v9stat;
int len, err = 0;
int32_t count = 0;
struct stat stbuf;
off_t saved_dir_pos;
struct dirent *dent, *result;
/* save the directory position */
saved_dir_pos = v9fs_co_telldir(pdu, fidp);
if (saved_dir_pos < 0) {
return saved_dir_pos;
}
dent = g_malloc(sizeof(struct dirent));
while (1) {
v9fs_path_init(&path);
err = v9fs_co_readdir_r(pdu, fidp, dent, &result);
if (err || !result) {
break;
}
err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path);
if (err < 0) {
goto out;
}
err = v9fs_co_lstat(pdu, &path, &stbuf);
if (err < 0) {
goto out;
}
err = stat_to_v9stat(pdu, &path, &stbuf, &v9stat);
if (err < 0) {
goto out;
}
/* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
len = pdu_marshal(pdu, 11 + count, "S", &v9stat);
if ((len != (v9stat.size + 2)) || ((count + len) > max_count)) {
/* Ran out of buffer. Set dir back to old position and return */
v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
v9fs_stat_free(&v9stat);
v9fs_path_free(&path);
g_free(dent);
return count;
}
count += len;
v9fs_stat_free(&v9stat);
v9fs_path_free(&path);
saved_dir_pos = dent->d_off;
}
out:
g_free(dent);
v9fs_path_free(&path);
if (err < 0) {
return err;
}
return count;
}
static void v9fs_read(void *opaque)
{
int32_t fid;
int64_t off;
ssize_t err = 0;
int32_t count = 0;
size_t offset = 7;
int32_t max_count;
V9fsFidState *fidp;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count);
trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count);
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
if (fidp->fid_type == P9_FID_DIR) {
if (off == 0) {
v9fs_co_rewinddir(pdu, fidp);
}
count = v9fs_do_readdir_with_stat(pdu, fidp, max_count);
if (count < 0) {
err = count;
goto out;
}
err = offset;
err += pdu_marshal(pdu, offset, "d", count);
err += count;
} else if (fidp->fid_type == P9_FID_FILE) {
int32_t cnt;
int32_t len;
struct iovec *sg;
struct iovec iov[128]; /* FIXME: bad, bad, bad */
sg = iov;
pdu_marshal(pdu, offset + 4, "v", sg, &cnt);
sg = cap_sg(sg, max_count, &cnt);
do {
if (0) {
print_sg(sg, cnt);
}
/* Loop in case of EINTR */
do {
len = v9fs_co_preadv(pdu, fidp, sg, cnt, off);
if (len >= 0) {
off += len;
count += len;
}
} while (len == -EINTR && !pdu->cancelled);
if (len < 0) {
/* IO error return the error */
err = len;
goto out;
}
sg = adjust_sg(sg, len, &cnt);
} while (count < max_count && len > 0);
err = offset;
err += pdu_marshal(pdu, offset, "d", count);
err += count;
} else if (fidp->fid_type == P9_FID_XATTR) {
err = v9fs_xattr_read(s, pdu, fidp, off, max_count);
} else {
err = -EINVAL;
}
trace_v9fs_read_return(pdu->tag, pdu->id, count, err);
out:
put_fid(pdu, fidp);
out_nofid:
complete_pdu(s, pdu, err);
}
static size_t v9fs_readdir_data_size(V9fsString *name)
{
/*
* Size of each dirent on the wire: size of qid (13) + size of offset (8)
* size of type (1) + size of name.size (2) + strlen(name.data)
*/
return 24 + v9fs_string_size(name);
}
static int v9fs_do_readdir(V9fsPDU *pdu,
V9fsFidState *fidp, int32_t max_count)
{
size_t size;
V9fsQID qid;
V9fsString name;
int len, err = 0;
int32_t count = 0;
off_t saved_dir_pos;
struct dirent *dent, *result;
/* save the directory position */
saved_dir_pos = v9fs_co_telldir(pdu, fidp);
if (saved_dir_pos < 0) {
return saved_dir_pos;
}
dent = g_malloc(sizeof(struct dirent));
while (1) {
err = v9fs_co_readdir_r(pdu, fidp, dent, &result);
if (err || !result) {
break;
}
v9fs_string_init(&name);
v9fs_string_sprintf(&name, "%s", dent->d_name);
if ((count + v9fs_readdir_data_size(&name)) > max_count) {
/* Ran out of buffer. Set dir back to old position and return */
v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
v9fs_string_free(&name);
g_free(dent);
return count;
}
/*
* Fill up just the path field of qid because the client uses
* only that. To fill the entire qid structure we will have
* to stat each dirent found, which is expensive
*/
size = MIN(sizeof(dent->d_ino), sizeof(qid.path));
memcpy(&qid.path, &dent->d_ino, size);
/* Fill the other fields with dummy values */
qid.type = 0;
qid.version = 0;
/* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
len = pdu_marshal(pdu, 11 + count, "Qqbs",
&qid, dent->d_off,
dent->d_type, &name);
count += len;
v9fs_string_free(&name);
saved_dir_pos = dent->d_off;
}
g_free(dent);
if (err < 0) {
return err;
}
return count;
}
static void v9fs_readdir(void *opaque)
{
int32_t fid;
V9fsFidState *fidp;
ssize_t retval = 0;
size_t offset = 7;
int64_t initial_offset;
int32_t count, max_count;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
pdu_unmarshal(pdu, offset, "dqd", &fid, &initial_offset, &max_count);
trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count);
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
retval = -EINVAL;
goto out_nofid;
}
if (!fidp->fs.dir) {
retval = -EINVAL;
goto out;
}
if (initial_offset == 0) {
v9fs_co_rewinddir(pdu, fidp);
} else {
v9fs_co_seekdir(pdu, fidp, initial_offset);
}
count = v9fs_do_readdir(pdu, fidp, max_count);
if (count < 0) {
retval = count;
goto out;
}
retval = offset;
retval += pdu_marshal(pdu, offset, "d", count);
retval += count;
trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval);
out:
put_fid(pdu, fidp);
out_nofid:
complete_pdu(s, pdu, retval);
}
static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp,
int64_t off, int32_t count,
struct iovec *sg, int cnt)
{
int i, to_copy;
ssize_t err = 0;
int write_count;
int64_t xattr_len;
size_t offset = 7;
xattr_len = fidp->fs.xattr.len;
write_count = xattr_len - off;
if (write_count > count) {
write_count = count;
} else if (write_count < 0) {
/*
* write beyond XATTR value len specified in
* xattrcreate
*/
err = -ENOSPC;
goto out;
}
offset += pdu_marshal(pdu, offset, "d", write_count);
err = offset;
fidp->fs.xattr.copied_len += write_count;
/*
* Now copy the content from sg list
*/
for (i = 0; i < cnt; i++) {
if (write_count > sg[i].iov_len) {
to_copy = sg[i].iov_len;
} else {
to_copy = write_count;
}
memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy);
/* updating vs->off since we are not using below */
off += to_copy;
write_count -= to_copy;
}
out:
return err;
}
static void v9fs_write(void *opaque)
{
int cnt;
ssize_t err;
int32_t fid;
int64_t off;
int32_t count;
int32_t len = 0;
int32_t total = 0;
size_t offset = 7;
V9fsFidState *fidp;
struct iovec iov[128]; /* FIXME: bad, bad, bad */
struct iovec *sg = iov;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
pdu_unmarshal(pdu, offset, "dqdv", &fid, &off, &count, sg, &cnt);
trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, cnt);
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
if (fidp->fid_type == P9_FID_FILE) {
if (fidp->fs.fd == -1) {
err = -EINVAL;
goto out;
}
} else if (fidp->fid_type == P9_FID_XATTR) {
/*
* setxattr operation
*/
err = v9fs_xattr_write(s, pdu, fidp, off, count, sg, cnt);
goto out;
} else {
err = -EINVAL;
goto out;
}
sg = cap_sg(sg, count, &cnt);
do {
if (0) {
print_sg(sg, cnt);
}
/* Loop in case of EINTR */
do {
len = v9fs_co_pwritev(pdu, fidp, sg, cnt, off);
if (len >= 0) {
off += len;
total += len;
}
} while (len == -EINTR && !pdu->cancelled);
if (len < 0) {
/* IO error return the error */
err = len;
goto out;
}
sg = adjust_sg(sg, len, &cnt);
} while (total < count && len > 0);
offset += pdu_marshal(pdu, offset, "d", total);
err = offset;
trace_v9fs_write_return(pdu->tag, pdu->id, total, err);
out:
put_fid(pdu, fidp);
out_nofid:
complete_pdu(s, pdu, err);
}
static void v9fs_create(void *opaque)
{
int32_t fid;
int err = 0;
size_t offset = 7;
V9fsFidState *fidp;
V9fsQID qid;
int32_t perm;
int8_t mode;
V9fsPath path;
struct stat stbuf;
V9fsString name;
V9fsString extension;
int iounit;
V9fsPDU *pdu = opaque;
v9fs_path_init(&path);
pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name,
&perm, &mode, &extension);
trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode);
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
if (perm & P9_STAT_MODE_DIR) {
err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777,
fidp->uid, -1, &stbuf);
if (err < 0) {
goto out;
}
err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
if (err < 0) {
goto out;
}
v9fs_path_copy(&fidp->path, &path);
err = v9fs_co_opendir(pdu, fidp);
if (err < 0) {
goto out;
}
fidp->fid_type = P9_FID_DIR;
} else if (perm & P9_STAT_MODE_SYMLINK) {
err = v9fs_co_symlink(pdu, fidp, &name,
extension.data, -1 , &stbuf);
if (err < 0) {
goto out;
}
err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
if (err < 0) {
goto out;
}
v9fs_path_copy(&fidp->path, &path);
} else if (perm & P9_STAT_MODE_LINK) {
int32_t ofid = atoi(extension.data);
V9fsFidState *ofidp = get_fid(pdu, ofid);
if (ofidp == NULL) {
err = -EINVAL;
goto out;
}
err = v9fs_co_link(pdu, ofidp, fidp, &name);
put_fid(pdu, ofidp);
if (err < 0) {
goto out;
}
err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
if (err < 0) {
fidp->fid_type = P9_FID_NONE;
goto out;
}
v9fs_path_copy(&fidp->path, &path);
err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
if (err < 0) {
fidp->fid_type = P9_FID_NONE;
goto out;
}
} else if (perm & P9_STAT_MODE_DEVICE) {
char ctype;
uint32_t major, minor;
mode_t nmode = 0;
if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) {
err = -errno;
goto out;
}
switch (ctype) {
case 'c':
nmode = S_IFCHR;
break;
case 'b':
nmode = S_IFBLK;
break;
default:
err = -EIO;
goto out;
}
nmode |= perm & 0777;
err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
makedev(major, minor), nmode, &stbuf);
if (err < 0) {
goto out;
}
err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
if (err < 0) {
goto out;
}
v9fs_path_copy(&fidp->path, &path);
} else if (perm & P9_STAT_MODE_NAMED_PIPE) {
err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
0, S_IFIFO | (perm & 0777), &stbuf);
if (err < 0) {
goto out;
}
err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
if (err < 0) {
goto out;
}
v9fs_path_copy(&fidp->path, &path);
} else if (perm & P9_STAT_MODE_SOCKET) {
err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
0, S_IFSOCK | (perm & 0777), &stbuf);
if (err < 0) {
goto out;
}
err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
if (err < 0) {
goto out;
}
v9fs_path_copy(&fidp->path, &path);
} else {
err = v9fs_co_open2(pdu, fidp, &name, -1,
omode_to_uflags(mode)|O_CREAT, perm, &stbuf);
if (err < 0) {
goto out;
}
fidp->fid_type = P9_FID_FILE;
fidp->open_flags = omode_to_uflags(mode);
if (fidp->open_flags & O_EXCL) {
/*
* We let the host file system do O_EXCL check
* We should not reclaim such fd
*/
fidp->flags |= FID_NON_RECLAIMABLE;
}
}
iounit = get_iounit(pdu, &fidp->path);
stat_to_qid(&stbuf, &qid);
offset += pdu_marshal(pdu, offset, "Qd", &qid, iounit);
err = offset;
trace_v9fs_create_return(pdu->tag, pdu->id,
qid.type, qid.version, qid.path, iounit);
out:
put_fid(pdu, fidp);
out_nofid:
complete_pdu(pdu->s, pdu, err);
v9fs_string_free(&name);
v9fs_string_free(&extension);
v9fs_path_free(&path);
}
static void v9fs_symlink(void *opaque)
{
V9fsPDU *pdu = opaque;
V9fsString name;
V9fsString symname;
V9fsFidState *dfidp;
V9fsQID qid;
struct stat stbuf;
int32_t dfid;
int err = 0;
gid_t gid;
size_t offset = 7;
pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid);
trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid);
dfidp = get_fid(pdu, dfid);
if (dfidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf);
if (err < 0) {
goto out;
}
stat_to_qid(&stbuf, &qid);
offset += pdu_marshal(pdu, offset, "Q", &qid);
err = offset;
trace_v9fs_symlink_return(pdu->tag, pdu->id,
qid.type, qid.version, qid.path);
out:
put_fid(pdu, dfidp);
out_nofid:
complete_pdu(pdu->s, pdu, err);
v9fs_string_free(&name);
v9fs_string_free(&symname);
}
static void v9fs_flush(void *opaque)
{
int16_t tag;
size_t offset = 7;
V9fsPDU *cancel_pdu;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
pdu_unmarshal(pdu, offset, "w", &tag);
trace_v9fs_flush(pdu->tag, pdu->id, tag);
QLIST_FOREACH(cancel_pdu, &s->active_list, next) {
if (cancel_pdu->tag == tag) {
break;
}
}
if (cancel_pdu) {
cancel_pdu->cancelled = 1;
/*
* Wait for pdu to complete.
*/
qemu_co_queue_wait(&cancel_pdu->complete);
cancel_pdu->cancelled = 0;
free_pdu(pdu->s, cancel_pdu);
}
complete_pdu(s, pdu, 7);
return;
}
static void v9fs_link(void *opaque)
{
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
int32_t dfid, oldfid;
V9fsFidState *dfidp, *oldfidp;
V9fsString name;;
size_t offset = 7;
int err = 0;
pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name);
trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data);
dfidp = get_fid(pdu, dfid);
if (dfidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
oldfidp = get_fid(pdu, oldfid);
if (oldfidp == NULL) {
err = -ENOENT;
goto out;
}
err = v9fs_co_link(pdu, oldfidp, dfidp, &name);
if (!err) {
err = offset;
}
out:
put_fid(pdu, dfidp);
out_nofid:
v9fs_string_free(&name);
complete_pdu(s, pdu, err);
}
/* Only works with path name based fid */
static void v9fs_remove(void *opaque)
{
int32_t fid;
int err = 0;
size_t offset = 7;
V9fsFidState *fidp;
V9fsPDU *pdu = opaque;
pdu_unmarshal(pdu, offset, "d", &fid);
trace_v9fs_remove(pdu->tag, pdu->id, fid);
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
/* if fs driver is not path based, return EOPNOTSUPP */
if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) {
err = -EOPNOTSUPP;
goto out_err;
}
/*
* IF the file is unlinked, we cannot reopen
* the file later. So don't reclaim fd
*/
err = v9fs_mark_fids_unreclaim(pdu, &fidp->path);
if (err < 0) {
goto out_err;
}
err = v9fs_co_remove(pdu, &fidp->path);
if (!err) {
err = offset;
}
out_err:
/* For TREMOVE we need to clunk the fid even on failed remove */
clunk_fid(pdu->s, fidp->fid);
put_fid(pdu, fidp);
out_nofid:
complete_pdu(pdu->s, pdu, err);
}
static void v9fs_unlinkat(void *opaque)
{
int err = 0;
V9fsString name;
int32_t dfid, flags;
size_t offset = 7;
V9fsPath path;
V9fsFidState *dfidp;
V9fsPDU *pdu = opaque;
pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags);
flags = dotl_to_at_flags(flags);
dfidp = get_fid(pdu, dfid);
if (dfidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
/*
* IF the file is unlinked, we cannot reopen
* the file later. So don't reclaim fd
*/
v9fs_path_init(&path);
err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path);
if (err < 0) {
goto out_err;
}
err = v9fs_mark_fids_unreclaim(pdu, &path);
if (err < 0) {
goto out_err;
}
err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, flags);
if (!err) {
err = offset;
}
out_err:
put_fid(pdu, dfidp);
v9fs_path_free(&path);
out_nofid:
complete_pdu(pdu->s, pdu, err);
v9fs_string_free(&name);
}
/* Only works with path name based fid */
static int v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp,
int32_t newdirfid, V9fsString *name)
{
char *end;
int err = 0;
V9fsPath new_path;
V9fsFidState *tfidp;
V9fsState *s = pdu->s;
V9fsFidState *dirfidp = NULL;
char *old_name, *new_name;
v9fs_path_init(&new_path);
if (newdirfid != -1) {
dirfidp = get_fid(pdu, newdirfid);
if (dirfidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
BUG_ON(dirfidp->fid_type != P9_FID_NONE);
v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path);
} else {
old_name = fidp->path.data;
end = strrchr(old_name, '/');
if (end) {
end++;
} else {
end = old_name;
}
new_name = g_malloc0(end - old_name + name->size + 1);
strncat(new_name, old_name, end - old_name);
strncat(new_name + (end - old_name), name->data, name->size);
v9fs_co_name_to_path(pdu, NULL, new_name, &new_path);
g_free(new_name);
}
err = v9fs_co_rename(pdu, &fidp->path, &new_path);
if (err < 0) {
goto out;
}
/*
* Fixup fid's pointing to the old name to
* start pointing to the new name
*/
for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) {
if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) {
/* replace the name */
v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data));
}
}
out:
if (dirfidp) {
put_fid(pdu, dirfidp);
}
v9fs_path_free(&new_path);
out_nofid:
return err;
}
/* Only works with path name based fid */
static void v9fs_rename(void *opaque)
{
int32_t fid;
ssize_t err = 0;
size_t offset = 7;
V9fsString name;
int32_t newdirfid;
V9fsFidState *fidp;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name);
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
BUG_ON(fidp->fid_type != P9_FID_NONE);
/* if fs driver is not path based, return EOPNOTSUPP */
if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) {
err = -EOPNOTSUPP;
goto out;
}
v9fs_path_write_lock(s);
err = v9fs_complete_rename(pdu, fidp, newdirfid, &name);
v9fs_path_unlock(s);
if (!err) {
err = offset;
}
out:
put_fid(pdu, fidp);
out_nofid:
complete_pdu(s, pdu, err);
v9fs_string_free(&name);
}
static void v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir,
V9fsString *old_name, V9fsPath *newdir,
V9fsString *new_name)
{
V9fsFidState *tfidp;
V9fsPath oldpath, newpath;
V9fsState *s = pdu->s;
v9fs_path_init(&oldpath);
v9fs_path_init(&newpath);
v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath);
v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath);
/*
* Fixup fid's pointing to the old name to
* start pointing to the new name
*/
for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) {
if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) {
/* replace the name */
v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data));
}
}
v9fs_path_free(&oldpath);
v9fs_path_free(&newpath);
}
static int v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid,
V9fsString *old_name, int32_t newdirfid,
V9fsString *new_name)
{
int err = 0;
V9fsState *s = pdu->s;
V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL;
olddirfidp = get_fid(pdu, olddirfid);
if (olddirfidp == NULL) {
err = -ENOENT;
goto out;
}
if (newdirfid != -1) {
newdirfidp = get_fid(pdu, newdirfid);
if (newdirfidp == NULL) {
err = -ENOENT;
goto out;
}
} else {
newdirfidp = get_fid(pdu, olddirfid);
}
err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name,
&newdirfidp->path, new_name);
if (err < 0) {
goto out;
}
if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
/* Only for path based fid we need to do the below fixup */
v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name,
&newdirfidp->path, new_name);
}
out:
if (olddirfidp) {
put_fid(pdu, olddirfidp);
}
if (newdirfidp) {
put_fid(pdu, newdirfidp);
}
return err;
}
static void v9fs_renameat(void *opaque)
{
ssize_t err = 0;
size_t offset = 7;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
int32_t olddirfid, newdirfid;
V9fsString old_name, new_name;
pdu_unmarshal(pdu, offset, "dsds", &olddirfid,
&old_name, &newdirfid, &new_name);
v9fs_path_write_lock(s);
err = v9fs_complete_renameat(pdu, olddirfid,
&old_name, newdirfid, &new_name);
v9fs_path_unlock(s);
if (!err) {
err = offset;
}
complete_pdu(s, pdu, err);
v9fs_string_free(&old_name);
v9fs_string_free(&new_name);
}
static void v9fs_wstat(void *opaque)
{
int32_t fid;
int err = 0;
int16_t unused;
V9fsStat v9stat;
size_t offset = 7;
struct stat stbuf;
V9fsFidState *fidp;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat);
trace_v9fs_wstat(pdu->tag, pdu->id, fid,
v9stat.mode, v9stat.atime, v9stat.mtime);
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
/* do we need to sync the file? */
if (donttouch_stat(&v9stat)) {
err = v9fs_co_fsync(pdu, fidp, 0);
goto out;
}
if (v9stat.mode != -1) {
uint32_t v9_mode;
err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
if (err < 0) {
goto out;
}
v9_mode = stat_to_v9mode(&stbuf);
if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) !=
(v9_mode & P9_STAT_MODE_TYPE_BITS)) {
/* Attempting to change the type */
err = -EIO;
goto out;
}
err = v9fs_co_chmod(pdu, &fidp->path,
v9mode_to_mode(v9stat.mode,
&v9stat.extension));
if (err < 0) {
goto out;
}
}
if (v9stat.mtime != -1 || v9stat.atime != -1) {
struct timespec times[2];
if (v9stat.atime != -1) {
times[0].tv_sec = v9stat.atime;
times[0].tv_nsec = 0;
} else {
times[0].tv_nsec = UTIME_OMIT;
}
if (v9stat.mtime != -1) {
times[1].tv_sec = v9stat.mtime;
times[1].tv_nsec = 0;
} else {
times[1].tv_nsec = UTIME_OMIT;
}
err = v9fs_co_utimensat(pdu, &fidp->path, times);
if (err < 0) {
goto out;
}
}
if (v9stat.n_gid != -1 || v9stat.n_uid != -1) {
err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid);
if (err < 0) {
goto out;
}
}
if (v9stat.name.size != 0) {
err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name);
if (err < 0) {
goto out;
}
}
if (v9stat.length != -1) {
err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length);
if (err < 0) {
goto out;
}
}
err = offset;
out:
put_fid(pdu, fidp);
out_nofid:
v9fs_stat_free(&v9stat);
complete_pdu(s, pdu, err);
}
static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf)
{
uint32_t f_type;
uint32_t f_bsize;
uint64_t f_blocks;
uint64_t f_bfree;
uint64_t f_bavail;
uint64_t f_files;
uint64_t f_ffree;
uint64_t fsid_val;
uint32_t f_namelen;
size_t offset = 7;
int32_t bsize_factor;
/*
* compute bsize factor based on host file system block size
* and client msize
*/
bsize_factor = (s->msize - P9_IOHDRSZ)/stbuf->f_bsize;
if (!bsize_factor) {
bsize_factor = 1;
}
f_type = stbuf->f_type;
f_bsize = stbuf->f_bsize;
f_bsize *= bsize_factor;
/*
* f_bsize is adjusted(multiplied) by bsize factor, so we need to
* adjust(divide) the number of blocks, free blocks and available
* blocks by bsize factor
*/
f_blocks = stbuf->f_blocks/bsize_factor;
f_bfree = stbuf->f_bfree/bsize_factor;
f_bavail = stbuf->f_bavail/bsize_factor;
f_files = stbuf->f_files;
f_ffree = stbuf->f_ffree;
fsid_val = (unsigned int) stbuf->f_fsid.__val[0] |
(unsigned long long)stbuf->f_fsid.__val[1] << 32;
f_namelen = stbuf->f_namelen;
return pdu_marshal(pdu, offset, "ddqqqqqqd",
f_type, f_bsize, f_blocks, f_bfree,
f_bavail, f_files, f_ffree,
fsid_val, f_namelen);
}
static void v9fs_statfs(void *opaque)
{
int32_t fid;
ssize_t retval = 0;
size_t offset = 7;
V9fsFidState *fidp;
struct statfs stbuf;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
pdu_unmarshal(pdu, offset, "d", &fid);
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
retval = -ENOENT;
goto out_nofid;
}
retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf);
if (retval < 0) {
goto out;
}
retval = offset;
retval += v9fs_fill_statfs(s, pdu, &stbuf);
out:
put_fid(pdu, fidp);
out_nofid:
complete_pdu(s, pdu, retval);
return;
}
static void v9fs_mknod(void *opaque)
{
int mode;
gid_t gid;
int32_t fid;
V9fsQID qid;
int err = 0;
int major, minor;
size_t offset = 7;
V9fsString name;
struct stat stbuf;
V9fsFidState *fidp;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode,
&major, &minor, &gid);
trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor);
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid,
makedev(major, minor), mode, &stbuf);
if (err < 0) {
goto out;
}
stat_to_qid(&stbuf, &qid);
err = offset;
err += pdu_marshal(pdu, offset, "Q", &qid);
trace_v9fs_mknod_return(pdu->tag, pdu->id,
qid.type, qid.version, qid.path);
out:
put_fid(pdu, fidp);
out_nofid:
complete_pdu(s, pdu, err);
v9fs_string_free(&name);
}
/*
* Implement posix byte range locking code
* Server side handling of locking code is very simple, because 9p server in
* QEMU can handle only one client. And most of the lock handling
* (like conflict, merging) etc is done by the VFS layer itself, so no need to
* do any thing in * qemu 9p server side lock code path.
* So when a TLOCK request comes, always return success
*/
static void v9fs_lock(void *opaque)
{
int8_t status;
V9fsFlock *flock;
size_t offset = 7;
struct stat stbuf;
V9fsFidState *fidp;
int32_t fid, err = 0;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
flock = g_malloc(sizeof(*flock));
pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock->type,
&flock->flags, &flock->start, &flock->length,
&flock->proc_id, &flock->client_id);
trace_v9fs_lock(pdu->tag, pdu->id, fid,
flock->type, flock->start, flock->length);
status = P9_LOCK_ERROR;
/* We support only block flag now (that too ignored currently) */
if (flock->flags & ~P9_LOCK_FLAGS_BLOCK) {
err = -EINVAL;
goto out_nofid;
}
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
err = v9fs_co_fstat(pdu, fidp->fs.fd, &stbuf);
if (err < 0) {
goto out;
}
status = P9_LOCK_SUCCESS;
out:
put_fid(pdu, fidp);
out_nofid:
err = offset;
err += pdu_marshal(pdu, offset, "b", status);
trace_v9fs_lock_return(pdu->tag, pdu->id, status);
complete_pdu(s, pdu, err);
v9fs_string_free(&flock->client_id);
g_free(flock);
}
/*
* When a TGETLOCK request comes, always return success because all lock
* handling is done by client's VFS layer.
*/
static void v9fs_getlock(void *opaque)
{
size_t offset = 7;
struct stat stbuf;
V9fsFidState *fidp;
V9fsGetlock *glock;
int32_t fid, err = 0;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
glock = g_malloc(sizeof(*glock));
pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock->type,
&glock->start, &glock->length, &glock->proc_id,
&glock->client_id);
trace_v9fs_getlock(pdu->tag, pdu->id, fid,
glock->type, glock->start, glock->length);
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
err = v9fs_co_fstat(pdu, fidp->fs.fd, &stbuf);
if (err < 0) {
goto out;
}
glock->type = P9_LOCK_TYPE_UNLCK;
offset += pdu_marshal(pdu, offset, "bqqds", glock->type,
glock->start, glock->length, glock->proc_id,
&glock->client_id);
err = offset;
trace_v9fs_getlock_return(pdu->tag, pdu->id, glock->type, glock->start,
glock->length, glock->proc_id);
out:
put_fid(pdu, fidp);
out_nofid:
complete_pdu(s, pdu, err);
v9fs_string_free(&glock->client_id);
g_free(glock);
}
static void v9fs_mkdir(void *opaque)
{
V9fsPDU *pdu = opaque;
size_t offset = 7;
int32_t fid;
struct stat stbuf;
V9fsQID qid;
V9fsString name;
V9fsFidState *fidp;
gid_t gid;
int mode;
int err = 0;
pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid);
trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid);
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf);
if (err < 0) {
goto out;
}
stat_to_qid(&stbuf, &qid);
offset += pdu_marshal(pdu, offset, "Q", &qid);
err = offset;
trace_v9fs_mkdir_return(pdu->tag, pdu->id,
qid.type, qid.version, qid.path, err);
out:
put_fid(pdu, fidp);
out_nofid:
complete_pdu(pdu->s, pdu, err);
v9fs_string_free(&name);
}
static void v9fs_xattrwalk(void *opaque)
{
int64_t size;
V9fsString name;
ssize_t err = 0;
size_t offset = 7;
int32_t fid, newfid;
V9fsFidState *file_fidp;
V9fsFidState *xattr_fidp = NULL;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name);
trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data);
file_fidp = get_fid(pdu, fid);
if (file_fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
xattr_fidp = alloc_fid(s, newfid);
if (xattr_fidp == NULL) {
err = -EINVAL;
goto out;
}
v9fs_path_copy(&xattr_fidp->path, &file_fidp->path);
if (name.data[0] == 0) {
/*
* listxattr request. Get the size first
*/
size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0);
if (size < 0) {
err = size;
clunk_fid(s, xattr_fidp->fid);
goto out;
}
/*
* Read the xattr value
*/
xattr_fidp->fs.xattr.len = size;
xattr_fidp->fid_type = P9_FID_XATTR;
xattr_fidp->fs.xattr.copied_len = -1;
if (size) {
xattr_fidp->fs.xattr.value = g_malloc(size);
err = v9fs_co_llistxattr(pdu, &xattr_fidp->path,
xattr_fidp->fs.xattr.value,
xattr_fidp->fs.xattr.len);
if (err < 0) {
clunk_fid(s, xattr_fidp->fid);
goto out;
}
}
offset += pdu_marshal(pdu, offset, "q", size);
err = offset;
} else {
/*
* specific xattr fid. We check for xattr
* presence also collect the xattr size
*/
size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path,
&name, NULL, 0);
if (size < 0) {
err = size;
clunk_fid(s, xattr_fidp->fid);
goto out;
}
/*
* Read the xattr value
*/
xattr_fidp->fs.xattr.len = size;
xattr_fidp->fid_type = P9_FID_XATTR;
xattr_fidp->fs.xattr.copied_len = -1;
if (size) {
xattr_fidp->fs.xattr.value = g_malloc(size);
err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path,
&name, xattr_fidp->fs.xattr.value,
xattr_fidp->fs.xattr.len);
if (err < 0) {
clunk_fid(s, xattr_fidp->fid);
goto out;
}
}
offset += pdu_marshal(pdu, offset, "q", size);
err = offset;
}
trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size);
out:
put_fid(pdu, file_fidp);
if (xattr_fidp) {
put_fid(pdu, xattr_fidp);
}
out_nofid:
complete_pdu(s, pdu, err);
v9fs_string_free(&name);
}
static void v9fs_xattrcreate(void *opaque)
{
int flags;
int32_t fid;
int64_t size;
ssize_t err = 0;
V9fsString name;
size_t offset = 7;
V9fsFidState *file_fidp;
V9fsFidState *xattr_fidp;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
pdu_unmarshal(pdu, offset, "dsqd",
&fid, &name, &size, &flags);
trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags);
file_fidp = get_fid(pdu, fid);
if (file_fidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
/* Make the file fid point to xattr */
xattr_fidp = file_fidp;
xattr_fidp->fid_type = P9_FID_XATTR;
xattr_fidp->fs.xattr.copied_len = 0;
xattr_fidp->fs.xattr.len = size;
xattr_fidp->fs.xattr.flags = flags;
v9fs_string_init(&xattr_fidp->fs.xattr.name);
v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name);
if (size) {
xattr_fidp->fs.xattr.value = g_malloc(size);
} else {
xattr_fidp->fs.xattr.value = NULL;
}
err = offset;
put_fid(pdu, file_fidp);
out_nofid:
complete_pdu(s, pdu, err);
v9fs_string_free(&name);
}
static void v9fs_readlink(void *opaque)
{
V9fsPDU *pdu = opaque;
size_t offset = 7;
V9fsString target;
int32_t fid;
int err = 0;
V9fsFidState *fidp;
pdu_unmarshal(pdu, offset, "d", &fid);
trace_v9fs_readlink(pdu->tag, pdu->id, fid);
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
v9fs_string_init(&target);
err = v9fs_co_readlink(pdu, &fidp->path, &target);
if (err < 0) {
goto out;
}
offset += pdu_marshal(pdu, offset, "s", &target);
err = offset;
trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data);
v9fs_string_free(&target);
out:
put_fid(pdu, fidp);
out_nofid:
complete_pdu(pdu->s, pdu, err);
}
static CoroutineEntry *pdu_co_handlers[] = {
[P9_TREADDIR] = v9fs_readdir,
[P9_TSTATFS] = v9fs_statfs,
[P9_TGETATTR] = v9fs_getattr,
[P9_TSETATTR] = v9fs_setattr,
[P9_TXATTRWALK] = v9fs_xattrwalk,
[P9_TXATTRCREATE] = v9fs_xattrcreate,
[P9_TMKNOD] = v9fs_mknod,
[P9_TRENAME] = v9fs_rename,
[P9_TLOCK] = v9fs_lock,
[P9_TGETLOCK] = v9fs_getlock,
[P9_TRENAMEAT] = v9fs_renameat,
[P9_TREADLINK] = v9fs_readlink,
[P9_TUNLINKAT] = v9fs_unlinkat,
[P9_TMKDIR] = v9fs_mkdir,
[P9_TVERSION] = v9fs_version,
[P9_TLOPEN] = v9fs_open,
[P9_TATTACH] = v9fs_attach,
[P9_TSTAT] = v9fs_stat,
[P9_TWALK] = v9fs_walk,
[P9_TCLUNK] = v9fs_clunk,
[P9_TFSYNC] = v9fs_fsync,
[P9_TOPEN] = v9fs_open,
[P9_TREAD] = v9fs_read,
#if 0
[P9_TAUTH] = v9fs_auth,
#endif
[P9_TFLUSH] = v9fs_flush,
[P9_TLINK] = v9fs_link,
[P9_TSYMLINK] = v9fs_symlink,
[P9_TCREATE] = v9fs_create,
[P9_TLCREATE] = v9fs_lcreate,
[P9_TWRITE] = v9fs_write,
[P9_TWSTAT] = v9fs_wstat,
[P9_TREMOVE] = v9fs_remove,
};
static void v9fs_op_not_supp(void *opaque)
{
V9fsPDU *pdu = opaque;
complete_pdu(pdu->s, pdu, -EOPNOTSUPP);
}
static void submit_pdu(V9fsState *s, V9fsPDU *pdu)
{
Coroutine *co;
CoroutineEntry *handler;
if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) ||
(pdu_co_handlers[pdu->id] == NULL)) {
handler = v9fs_op_not_supp;
} else {
handler = pdu_co_handlers[pdu->id];
}
co = qemu_coroutine_create(handler);
qemu_coroutine_enter(co, pdu);
}
void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
{
V9fsState *s = (V9fsState *)vdev;
V9fsPDU *pdu;
ssize_t len;
while ((pdu = alloc_pdu(s)) &&
(len = virtqueue_pop(vq, &pdu->elem)) != 0) {
uint8_t *ptr;
pdu->s = s;
BUG_ON(pdu->elem.out_num == 0 || pdu->elem.in_num == 0);
BUG_ON(pdu->elem.out_sg[0].iov_len < 7);
ptr = pdu->elem.out_sg[0].iov_base;
memcpy(&pdu->size, ptr, 4);
pdu->id = ptr[4];
memcpy(&pdu->tag, ptr + 5, 2);
qemu_co_queue_init(&pdu->complete);
submit_pdu(s, pdu);
}
free_pdu(s, pdu);
}
void virtio_9p_set_fd_limit(void)
{
struct rlimit rlim;
if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) {
fprintf(stderr, "Failed to get the resource limit\n");
exit(1);
}
open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur/3);
open_fd_rc = rlim.rlim_cur/2;
}
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