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407fee0f02
qemu/hw/9pfs/virtio-9p.c
Aneesh Kumar K.V 407fee0f02 hw/9pfs: Update the fidp path before opendir 
We need to update the fidp path before opendir. Since we don't
use the fid returned by mkdir, earlier code should not have
much issue. We do a double v9fs_string_copy here. The later patch
cleanup the entire function.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
2011-09-09 14:45:53 +05:30

3038 lines
78 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-debug.h"
#include "virtio-9p-xattr.h"
#include "virtio-9p-coth.h"
int debug_9p_pdu;
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;
}
void cred_init(FsCred *credp)
{
credp->fc_uid = -1;
credp->fc_gid = -1;
credp->fc_mode = -1;
credp->fc_rdev = -1;
}
static void v9fs_string_init(V9fsString *str)
{
str->data = NULL;
str->size = 0;
}
static void v9fs_string_free(V9fsString *str)
{
g_free(str->data);
str->data = NULL;
str->size = 0;
}
static 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);
}
static 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;
}
static void v9fs_string_copy(V9fsString *lhs, V9fsString *rhs)
{
v9fs_string_free(lhs);
v9fs_string_sprintf(lhs, "%s", rhs->data);
}
/*
* 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(V9fsString *s1, V9fsString *s2)
{
if (!strncmp(s1->data, s2->data, s1->size)) {
if (s2->data[s1->size] == '\0' || s2->data[s1->size] == '/') {
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(V9fsState *s, V9fsFidState *f)
{
int err = 1;
if (f->fid_type == P9_FID_FILE) {
if (f->fs.fd == -1) {
do {
err = v9fs_co_open(s, f, f->open_flags);
} while (err == -EINTR);
}
} else if (f->fid_type == P9_FID_DIR) {
if (f->fs.dir == NULL) {
do {
err = v9fs_co_opendir(s, f);
} while (err == -EINTR);
}
}
return err;
}
static V9fsFidState *get_fid(V9fsState *s, int32_t fid)
{
int err;
V9fsFidState *f;
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(s, 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(V9fsState *s, 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(s, &fidp->path, &fidp->fs.xattr.name,
fidp->fs.xattr.value,
fidp->fs.xattr.len,
fidp->fs.xattr.flags);
} else {
retval = v9fs_co_lremovexattr(s, &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(V9fsState *s, 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(s, fidp->fs.fd);
}
} else if (fidp->fid_type == P9_FID_DIR) {
if (fidp->fs.dir != NULL) {
retval = v9fs_co_closedir(s, fidp->fs.dir);
}
} else if (fidp->fid_type == P9_FID_XATTR) {
retval = v9fs_xattr_fid_clunk(s, fidp);
}
v9fs_string_free(&fidp->path);
g_free(fidp);
return retval;
}
static void put_fid(V9fsState *s, 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(s, fidp);
}
}
static int 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 -ENOENT;
}
fidp = *fidpp;
*fidpp = fidp->next;
fidp->clunked = 1;
return 0;
}
void v9fs_reclaim_fd(V9fsState *s)
{
int reclaim_count = 0;
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(s, f->fs_reclaim.fd);
} else if (f->fid_type == P9_FID_DIR) {
v9fs_co_closedir(s, f->fs_reclaim.dir);
}
f->rclm_lst = NULL;
/*
* Now drop the fid reference, free it
* if clunked.
*/
put_fid(s, f);
}
}
static int v9fs_mark_fids_unreclaim(V9fsState *s, V9fsString *str)
{
int err;
V9fsFidState *fidp, head_fid;
head_fid.next = s->fid_list;
for (fidp = s->fid_list; fidp; fidp = fidp->next) {
if (!strcmp(fidp->path.data, str->data)) {
/* Mark the fid non reclaimable. */
fidp->flags |= FID_NON_RECLAIMABLE;
/* reopen the file/dir if already closed */
err = v9fs_reopen_fid(s, 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;
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(V9fsState *s, V9fsFidState *fidp, V9fsQID *qidp)
{
struct stat stbuf;
int err;
err = v9fs_co_lstat(s, &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);
}
return pdu;
}
static void free_pdu(V9fsState *s, V9fsPDU *pdu)
{
if (pdu) {
if (debug_9p_pdu) {
pprint_pdu(pdu);
}
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;
}
}
/* 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);
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(V9fsState *s, V9fsString *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(s, 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");
}
static void v9fs_fix_path(V9fsString *dst, V9fsString *src, int len)
{
V9fsString str;
v9fs_string_init(&str);
v9fs_string_copy(&str, dst);
v9fs_string_sprintf(dst, "%s%s", src->data, str.data+len);
v9fs_string_free(&str);
}
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);
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);
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);
fidp = alloc_fid(s, fid);
if (fidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
fidp->uid = n_uname;
v9fs_string_sprintf(&fidp->path, "%s", "/");
err = fid_to_qid(s, fidp, &qid);
if (err < 0) {
err = -EINVAL;
clunk_fid(s, fid);
goto out;
}
offset += pdu_marshal(pdu, offset, "Q", &qid);
err = offset;
out:
put_fid(s, 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);
fidp = get_fid(s, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
err = v9fs_co_lstat(s, &fidp->path, &stbuf);
if (err < 0) {
goto out;
}
err = stat_to_v9stat(s, &fidp->path, &stbuf, &v9stat);
if (err < 0) {
goto out;
}
offset += pdu_marshal(pdu, offset, "wS", 0, &v9stat);
err = offset;
v9fs_stat_free(&v9stat);
out:
put_fid(s, 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);
fidp = get_fid(s, 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(s, &fidp->path, &stbuf);
if (retval < 0) {
goto out;
}
stat_to_v9stat_dotl(s, &stbuf, &v9stat_dotl);
retval = offset;
retval += pdu_marshal(pdu, offset, "A", &v9stat_dotl);
out:
put_fid(s, 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(s, fid);
if (fidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
if (v9iattr.valid & ATTR_MODE) {
err = v9fs_co_chmod(s, &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(s, &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(s, &fidp->path, v9iattr.uid,
v9iattr.gid);
if (err < 0) {
goto out;
}
}
if (v9iattr.valid & (ATTR_SIZE)) {
err = v9fs_co_truncate(s, &fidp->path, v9iattr.size);
if (err < 0) {
goto out;
}
}
err = offset;
out:
put_fid(s, 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;
V9fsString 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);
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(s, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
if (fid == newfid) {
BUG_ON(fidp->fid_type != P9_FID_NONE);
v9fs_string_init(&path);
for (name_idx = 0; name_idx < nwnames; name_idx++) {
v9fs_string_sprintf(&path, "%s/%s",
fidp->path.data, wnames[name_idx].data);
v9fs_string_copy(&fidp->path, &path);
err = v9fs_co_lstat(s, &fidp->path, &stbuf);
if (err < 0) {
v9fs_string_free(&path);
goto out;
}
stat_to_qid(&stbuf, &qids[name_idx]);
}
v9fs_string_free(&path);
} else {
newfidp = alloc_fid(s, newfid);
if (newfidp == NULL) {
err = -EINVAL;
goto out;
}
newfidp->uid = fidp->uid;
v9fs_string_init(&path);
v9fs_string_copy(&newfidp->path, &fidp->path);
for (name_idx = 0; name_idx < nwnames; name_idx++) {
v9fs_string_sprintf(&path, "%s/%s", newfidp->path.data,
wnames[name_idx].data);
v9fs_string_copy(&newfidp->path, &path);
err = v9fs_co_lstat(s, &newfidp->path, &stbuf);
if (err < 0) {
clunk_fid(s, newfidp->fid);
v9fs_string_free(&path);
goto out;
}
stat_to_qid(&stbuf, &qids[name_idx]);
}
v9fs_string_free(&path);
}
err = v9fs_walk_marshal(pdu, nwnames, qids);
out:
put_fid(s, fidp);
if (newfidp) {
put_fid(s, newfidp);
}
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);
}
}
static int32_t get_iounit(V9fsState *s, V9fsString *name)
{
struct statfs stbuf;
int32_t iounit = 0;
/*
* 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(s, name, &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;
int iounit;
int32_t fid;
int32_t mode;
V9fsQID qid;
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);
}
fidp = get_fid(s, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
BUG_ON(fidp->fid_type != P9_FID_NONE);
err = v9fs_co_lstat(s, &fidp->path, &stbuf);
if (err < 0) {
goto out;
}
stat_to_qid(&stbuf, &qid);
if (S_ISDIR(stbuf.st_mode)) {
err = v9fs_co_opendir(s, 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 = mode;
flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT);
/* Ignore direct disk access hint until the server supports it. */
flags &= ~O_DIRECT;
} else {
flags = omode_to_uflags(mode);
}
err = v9fs_co_open(s, 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(s, &fidp->path);
offset += pdu_marshal(pdu, offset, "Qd", &qid, iounit);
err = offset;
}
out:
put_fid(s, 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 fullname;
V9fsString name;
V9fsFidState *fidp;
struct stat stbuf;
V9fsQID qid;
int32_t iounit;
V9fsPDU *pdu = opaque;
v9fs_string_init(&fullname);
pdu_unmarshal(pdu, offset, "dsddd", &dfid, &name, &flags,
&mode, &gid);
fidp = get_fid(pdu->s, dfid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
v9fs_string_sprintf(&fullname, "%s/%s", fidp->path.data, name.data);
/* Ignore direct disk access hint until the server supports it. */
flags &= ~O_DIRECT;
err = v9fs_co_open2(pdu->s, fidp, fullname.data, gid, flags, mode);
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->s, &fullname);
err = v9fs_co_lstat(pdu->s, &fullname, &stbuf);
if (err < 0) {
fidp->fid_type = P9_FID_NONE;
if (fidp->fs.fd > 0) {
v9fs_co_close(pdu->s, fidp->fs.fd);
}
goto out;
}
v9fs_string_copy(&fidp->path, &fullname);
stat_to_qid(&stbuf, &qid);
offset += pdu_marshal(pdu, offset, "Qd", &qid, iounit);
err = offset;
out:
put_fid(pdu->s, fidp);
out_nofid:
complete_pdu(pdu->s, pdu, err);
v9fs_string_free(&name);
v9fs_string_free(&fullname);
}
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);
fidp = get_fid(s, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
err = v9fs_co_fsync(s, fidp, datasync);
if (!err) {
err = offset;
}
put_fid(s, 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);
fidp = get_fid(s, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
err = clunk_fid(s, fidp->fid);
if (err < 0) {
goto out;
}
err = offset;
out:
put_fid(s, 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(V9fsState *s, V9fsPDU *pdu,
V9fsFidState *fidp, int32_t max_count)
{
V9fsString name;
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(s, fidp);
if (saved_dir_pos < 0) {
return saved_dir_pos;
}
dent = g_malloc(sizeof(struct dirent));
while (1) {
v9fs_string_init(&name);
err = v9fs_co_readdir_r(s, fidp, dent, &result);
if (err || !result) {
break;
}
v9fs_string_sprintf(&name, "%s/%s", fidp->path.data, dent->d_name);
err = v9fs_co_lstat(s, &name, &stbuf);
if (err < 0) {
goto out;
}
err = stat_to_v9stat(s, &name, &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(s, fidp, saved_dir_pos);
v9fs_stat_free(&v9stat);
v9fs_string_free(&name);
g_free(dent);
return count;
}
count += len;
v9fs_stat_free(&v9stat);
v9fs_string_free(&name);
saved_dir_pos = dent->d_off;
}
out:
g_free(dent);
v9fs_string_free(&name);
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);
fidp = get_fid(s, fid);
if (fidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
if (fidp->fid_type == P9_FID_DIR) {
if (off == 0) {
v9fs_co_rewinddir(s, fidp);
}
count = v9fs_do_readdir_with_stat(s, 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(s, fidp, sg, cnt, off);
if (len >= 0) {
off += len;
count += len;
}
} while (len == -EINTR);
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;
}
out:
put_fid(s, 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(V9fsState *s, 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(s, fidp);
if (saved_dir_pos < 0) {
return saved_dir_pos;
}
dent = g_malloc(sizeof(struct dirent));
while (1) {
err = v9fs_co_readdir_r(s, 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(s, 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);
fidp = get_fid(s, fid);
if (fidp == NULL) {
retval = -EINVAL;
goto out_nofid;
}
if (!fidp->fs.dir) {
retval = -EINVAL;
goto out;
}
if (initial_offset == 0) {
v9fs_co_rewinddir(s, fidp);
} else {
v9fs_co_seekdir(s, fidp, initial_offset);
}
count = v9fs_do_readdir(s, pdu, fidp, max_count);
if (count < 0) {
retval = count;
goto out;
}
retval = offset;
retval += pdu_marshal(pdu, offset, "d", count);
retval += count;
out:
put_fid(s, 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);
fidp = get_fid(s, 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(s, fidp, sg, cnt, off);
if (len >= 0) {
off += len;
total += len;
}
} while (len == -EINTR);
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;
out:
put_fid(s, 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;
struct stat stbuf;
V9fsString name;
V9fsString extension;
V9fsString fullname;
int iounit;
V9fsPDU *pdu = opaque;
v9fs_string_init(&fullname);
pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name,
&perm, &mode, &extension);
fidp = get_fid(pdu->s, fid);
if (fidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
v9fs_string_sprintf(&fullname, "%s/%s", fidp->path.data, name.data);
err = v9fs_co_lstat(pdu->s, &fullname, &stbuf);
if (!err) {
err = -EEXIST;
goto out;
} else if (err != -ENOENT) {
goto out;
}
if (perm & P9_STAT_MODE_DIR) {
err = v9fs_co_mkdir(pdu->s, fullname.data, perm & 0777,
fidp->uid, -1);
if (err < 0) {
goto out;
}
v9fs_string_copy(&fidp->path, &fullname);
err = v9fs_co_opendir(pdu->s, fidp);
if (err < 0) {
goto out;
}
fidp->fid_type = P9_FID_DIR;
} else if (perm & P9_STAT_MODE_SYMLINK) {
err = v9fs_co_symlink(pdu->s, fidp, extension.data,
fullname.data, -1);
if (err < 0) {
goto out;
}
} else if (perm & P9_STAT_MODE_LINK) {
int32_t nfid = atoi(extension.data);
V9fsFidState *nfidp = get_fid(pdu->s, nfid);
if (nfidp == NULL) {
err = -EINVAL;
goto out;
}
err = v9fs_co_link(pdu->s, &nfidp->path, &fullname);
if (err < 0) {
put_fid(pdu->s, nfidp);
goto out;
}
put_fid(pdu->s, nfidp);
} 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->s, &fullname, fidp->uid, -1,
makedev(major, minor), nmode);
if (err < 0) {
goto out;
}
} else if (perm & P9_STAT_MODE_NAMED_PIPE) {
err = v9fs_co_mknod(pdu->s, &fullname, fidp->uid, -1,
0, S_IFIFO | (perm & 0777));
if (err < 0) {
goto out;
}
} else if (perm & P9_STAT_MODE_SOCKET) {
err = v9fs_co_mknod(pdu->s, &fullname, fidp->uid, -1,
0, S_IFSOCK | (perm & 0777));
if (err < 0) {
goto out;
}
} else {
err = v9fs_co_open2(pdu->s, fidp, fullname.data, -1,
omode_to_uflags(mode)|O_CREAT, perm);
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;
}
}
err = v9fs_co_lstat(pdu->s, &fullname, &stbuf);
if (err < 0) {
fidp->fid_type = P9_FID_NONE;
if (fidp->fs.fd) {
v9fs_co_close(pdu->s, fidp->fs.fd);
}
goto out;
}
iounit = get_iounit(pdu->s, &fidp->path);
v9fs_string_copy(&fidp->path, &fullname);
stat_to_qid(&stbuf, &qid);
offset += pdu_marshal(pdu, offset, "Qd", &qid, iounit);
err = offset;
out:
put_fid(pdu->s, fidp);
out_nofid:
complete_pdu(pdu->s, pdu, err);
v9fs_string_free(&name);
v9fs_string_free(&extension);
v9fs_string_free(&fullname);
}
static void v9fs_symlink(void *opaque)
{
V9fsPDU *pdu = opaque;
V9fsString name;
V9fsString symname;
V9fsString fullname;
V9fsFidState *dfidp;
V9fsQID qid;
struct stat stbuf;
int32_t dfid;
int err = 0;
gid_t gid;
size_t offset = 7;
v9fs_string_init(&fullname);
pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid);
dfidp = get_fid(pdu->s, dfid);
if (dfidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
v9fs_string_sprintf(&fullname, "%s/%s", dfidp->path.data, name.data);
err = v9fs_co_symlink(pdu->s, dfidp, symname.data, fullname.data, gid);
if (err < 0) {
goto out;
}
err = v9fs_co_lstat(pdu->s, &fullname, &stbuf);
if (err < 0) {
goto out;
}
stat_to_qid(&stbuf, &qid);
offset += pdu_marshal(pdu, offset, "Q", &qid);
err = offset;
out:
put_fid(pdu->s, dfidp);
out_nofid:
complete_pdu(pdu->s, pdu, err);
v9fs_string_free(&name);
v9fs_string_free(&symname);
v9fs_string_free(&fullname);
}
static void v9fs_flush(void *opaque)
{
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
/* A nop call with no return */
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, fullname;
size_t offset = 7;
int err = 0;
v9fs_string_init(&fullname);
pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name);
dfidp = get_fid(s, dfid);
if (dfidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
oldfidp = get_fid(s, oldfid);
if (oldfidp == NULL) {
err = -ENOENT;
goto out;
}
v9fs_string_sprintf(&fullname, "%s/%s", dfidp->path.data, name.data);
err = v9fs_co_link(s, &oldfidp->path, &fullname);
if (!err) {
err = offset;
}
v9fs_string_free(&fullname);
out:
put_fid(s, dfidp);
out_nofid:
v9fs_string_free(&name);
complete_pdu(s, pdu, err);
}
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);
fidp = get_fid(pdu->s, fid);
if (fidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
/*
* IF the file is unlinked, we cannot reopen
* the file later. So don't reclaim fd
*/
err = v9fs_mark_fids_unreclaim(pdu->s, &fidp->path);
if (err < 0) {
goto out_err;
}
err = v9fs_co_remove(pdu->s, &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->s, fidp);
out_nofid:
complete_pdu(pdu->s, pdu, err);
}
static int v9fs_complete_rename(V9fsState *s, V9fsFidState *fidp,
int32_t newdirfid, V9fsString *name)
{
char *end;
int err = 0;
V9fsFidState *dirfidp = NULL;
char *old_name, *new_name;
if (newdirfid != -1) {
dirfidp = get_fid(s, newdirfid);
if (dirfidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
BUG_ON(dirfidp->fid_type != P9_FID_NONE);
new_name = g_malloc0(dirfidp->path.size + name->size + 2);
strcpy(new_name, dirfidp->path.data);
strcat(new_name, "/");
strcat(new_name + dirfidp->path.size, name->data);
} 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_string_free(name);
name->data = new_name;
name->size = strlen(new_name);
if (strcmp(new_name, fidp->path.data) != 0) {
err = v9fs_co_rename(s, &fidp->path, name);
if (err < 0) {
goto out;
}
V9fsFidState *tfidp;
/*
* 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 (fidp == tfidp) {
/*
* we replace name of this fid towards the end
* so that our below strcmp will work
*/
continue;
}
if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) {
/* replace the name */
v9fs_fix_path(&tfidp->path, name, strlen(fidp->path.data));
}
}
v9fs_string_copy(&fidp->path, name);
}
out:
if (dirfidp) {
put_fid(s, dirfidp);
}
out_nofid:
return err;
}
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(s, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
BUG_ON(fidp->fid_type != P9_FID_NONE);
err = v9fs_complete_rename(s, fidp, newdirfid, &name);
if (!err) {
err = offset;
}
put_fid(s, fidp);
out_nofid:
complete_pdu(s, pdu, err);
v9fs_string_free(&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);
fidp = get_fid(s, fid);
if (fidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
/* do we need to sync the file? */
if (donttouch_stat(&v9stat)) {
err = v9fs_co_fsync(s, fidp, 0);
goto out;
}
if (v9stat.mode != -1) {
uint32_t v9_mode;
err = v9fs_co_lstat(s, &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(s, &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(s, &fidp->path, times);
if (err < 0) {
goto out;
}
}
if (v9stat.n_gid != -1 || v9stat.n_uid != -1) {
err = v9fs_co_chown(s, &fidp->path, v9stat.n_uid, v9stat.n_gid);
if (err < 0) {
goto out;
}
}
if (v9stat.name.size != 0) {
err = v9fs_complete_rename(s, fidp, -1, &v9stat.name);
if (err < 0) {
goto out;
}
}
if (v9stat.length != -1) {
err = v9fs_co_truncate(s, &fidp->path, v9stat.length);
if (err < 0) {
goto out;
}
}
err = offset;
out:
put_fid(s, 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(s, fid);
if (fidp == NULL) {
retval = -ENOENT;
goto out_nofid;
}
retval = v9fs_co_statfs(s, &fidp->path, &stbuf);
if (retval < 0) {
goto out;
}
retval = offset;
retval += v9fs_fill_statfs(s, pdu, &stbuf);
out:
put_fid(s, 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;
V9fsString fullname;
V9fsFidState *fidp;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
v9fs_string_init(&fullname);
pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode,
&major, &minor, &gid);
fidp = get_fid(s, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
v9fs_string_sprintf(&fullname, "%s/%s", fidp->path.data, name.data);
err = v9fs_co_mknod(s, &fullname, fidp->uid, gid,
makedev(major, minor), mode);
if (err < 0) {
goto out;
}
err = v9fs_co_lstat(s, &fullname, &stbuf);
if (err < 0) {
goto out;
}
stat_to_qid(&stbuf, &qid);
err = offset;
err += pdu_marshal(pdu, offset, "Q", &qid);
out:
put_fid(s, fidp);
out_nofid:
complete_pdu(s, pdu, err);
v9fs_string_free(&fullname);
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);
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(s, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
err = v9fs_co_fstat(s, fidp->fs.fd, &stbuf);
if (err < 0) {
goto out;
}
status = P9_LOCK_SUCCESS;
out:
put_fid(s, fidp);
out_nofid:
err = offset;
err += pdu_marshal(pdu, offset, "b", status);
complete_pdu(s, pdu, err);
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);
fidp = get_fid(s, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
err = v9fs_co_fstat(s, fidp->fs.fd, &stbuf);
if (err < 0) {
goto out;
}
glock->type = F_UNLCK;
offset += pdu_marshal(pdu, offset, "bqqds", glock->type,
glock->start, glock->length, glock->proc_id,
&glock->client_id);
err = offset;
out:
put_fid(s, fidp);
out_nofid:
complete_pdu(s, pdu, err);
g_free(glock);
}
static void v9fs_mkdir(void *opaque)
{
V9fsPDU *pdu = opaque;
size_t offset = 7;
int32_t fid;
struct stat stbuf;
V9fsString name, fullname;
V9fsQID qid;
V9fsFidState *fidp;
gid_t gid;
int mode;
int err = 0;
v9fs_string_init(&fullname);
pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid);
fidp = get_fid(pdu->s, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
v9fs_string_sprintf(&fullname, "%s/%s", fidp->path.data, name.data);
err = v9fs_co_mkdir(pdu->s, fullname.data, mode, fidp->uid, gid);
if (err < 0) {
goto out;
}
err = v9fs_co_lstat(pdu->s, &fullname, &stbuf);
if (err < 0) {
goto out;
}
stat_to_qid(&stbuf, &qid);
offset += pdu_marshal(pdu, offset, "Q", &qid);
err = offset;
out:
put_fid(pdu->s, fidp);
out_nofid:
complete_pdu(pdu->s, pdu, err);
v9fs_string_free(&fullname);
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);
file_fidp = get_fid(s, 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_string_copy(&xattr_fidp->path, &file_fidp->path);
if (name.data[0] == 0) {
/*
* listxattr request. Get the size first
*/
size = v9fs_co_llistxattr(s, &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(s, &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(s, &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(s, &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;
}
out:
put_fid(s, file_fidp);
if (xattr_fidp) {
put_fid(s, 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);
file_fidp = get_fid(s, 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(s, 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);
fidp = get_fid(pdu->s, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
v9fs_string_init(&target);
err = v9fs_co_readlink(pdu->s, &fidp->path, &target);
if (err < 0) {
goto out;
}
offset += pdu_marshal(pdu, offset, "s", &target);
err = offset;
v9fs_string_free(&target);
out:
put_fid(pdu->s, 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_TREADLINK] = v9fs_readlink,
[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 (debug_9p_pdu) {
pprint_pdu(pdu);
}
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);
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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