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qemu-patch-raspberry4/hw/9pfs/9p.c
Christian Schoenebeck 29c9d2ca80 9pfs: make v9fs_readdir_response_size() public 
Rename function v9fs_readdir_data_size() -> v9fs_readdir_response_size()
and make it callable from other units. So far this function is only
used by 9p.c, however subsequent patches require the function to be
callable from another 9pfs unit. And as we're at it; also make it clear
for what this function is used for.

Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Message-Id: <3668ebc7d5b929a0e4f1357457060d96f50f76f4.1596012787.git.qemu_oss@crudebyte.com>
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
2020-08-12 09:17:32 +02:00

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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 "qemu/osdep.h"
#include <glib/gprintf.h>
#include "hw/virtio/virtio.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "qemu/iov.h"
#include "qemu/main-loop.h"
#include "qemu/sockets.h"
#include "virtio-9p.h"
#include "fsdev/qemu-fsdev.h"
#include "9p-xattr.h"
#include "coth.h"
#include "trace.h"
#include "migration/blocker.h"
#include "sysemu/qtest.h"
#include "qemu/xxhash.h"
#include <math.h>
#include <linux/limits.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 ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
{
ssize_t ret;
va_list ap;
va_start(ap, fmt);
ret = pdu->s->transport->pdu_vmarshal(pdu, offset, fmt, ap);
va_end(ap);
return ret;
}
static ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
{
ssize_t ret;
va_list ap;
va_start(ap, fmt);
ret = pdu->s->transport->pdu_vunmarshal(pdu, offset, fmt, ap);
va_end(ap);
return ret;
}
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;
}
typedef struct DotlOpenflagMap {
int dotl_flag;
int open_flag;
} DotlOpenflagMap;
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;
DotlOpenflagMap 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_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 GCC_FMT_ATTR(2, 3)
v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...)
{
va_list ap;
v9fs_path_free(path);
va_start(ap, fmt);
/* Bump the size for including terminating NULL */
path->size = g_vasprintf(&path->data, fmt, ap) + 1;
va_end(ap);
}
void v9fs_path_copy(V9fsPath *dst, const V9fsPath *src)
{
v9fs_path_free(dst);
dst->size = src->size;
dst->data = g_memdup(src->data, src->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 coroutine_fn 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.stream == NULL) {
do {
err = v9fs_co_opendir(pdu, f);
} while (err == -EINTR && !pdu->cancelled);
}
}
return err;
}
static V9fsFidState *coroutine_fn 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;
v9fs_readdir_init(&f->fs.dir);
v9fs_readdir_init(&f->fs_reclaim.dir);
return f;
}
static int coroutine_fn v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp)
{
int retval = 0;
if (fidp->fs.xattr.xattrwalk_fid) {
/* 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:
g_free(fidp->fs.xattr.value);
return retval;
}
static int coroutine_fn 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);
}
} else if (fidp->fid_type == P9_FID_DIR) {
if (fidp->fs.dir.stream != NULL) {
retval = v9fs_co_closedir(pdu, &fidp->fs);
}
} 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 int coroutine_fn 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) {
if (fidp->fid == pdu->s->root_fid) {
/*
* if the clunked fid is root fid then we
* have unmounted the fs on the client side.
* delete the migration blocker. Ideally, this
* should be hooked to transport close notification
*/
if (pdu->s->migration_blocker) {
migrate_del_blocker(pdu->s->migration_blocker);
error_free(pdu->s->migration_blocker);
pdu->s->migration_blocker = NULL;
}
}
return free_fid(pdu, fidp);
}
return 0;
}
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 coroutine_fn 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.stream != 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.stream = f->fs.dir.stream;
f->fs.dir.stream = 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);
} else if (f->fid_type == P9_FID_DIR) {
v9fs_co_closedir(pdu, &f->fs_reclaim);
}
f->rclm_lst = NULL;
/*
* Now drop the fid reference, free it
* if clunked.
*/
put_fid(pdu, f);
}
}
static int coroutine_fn 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 err;
}
/*
* 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;
}
static void coroutine_fn virtfs_reset(V9fsPDU *pdu)
{
V9fsState *s = pdu->s;
V9fsFidState *fidp;
/* Free all fids */
while (s->fid_list) {
/* Get fid */
fidp = s->fid_list;
fidp->ref++;
/* Clunk fid */
s->fid_list = fidp->next;
fidp->clunked = 1;
put_fid(pdu, fidp);
}
}
#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)
/* Mirrors all bits of a byte. So e.g. binary 10100000 would become 00000101. */
static inline uint8_t mirror8bit(uint8_t byte)
{
return (byte * 0x0202020202ULL & 0x010884422010ULL) % 1023;
}
/* Same as mirror8bit() just for a 64 bit data type instead for a byte. */
static inline uint64_t mirror64bit(uint64_t value)
{
return ((uint64_t)mirror8bit(value & 0xff) << 56) |
((uint64_t)mirror8bit((value >> 8) & 0xff) << 48) |
((uint64_t)mirror8bit((value >> 16) & 0xff) << 40) |
((uint64_t)mirror8bit((value >> 24) & 0xff) << 32) |
((uint64_t)mirror8bit((value >> 32) & 0xff) << 24) |
((uint64_t)mirror8bit((value >> 40) & 0xff) << 16) |
((uint64_t)mirror8bit((value >> 48) & 0xff) << 8) |
((uint64_t)mirror8bit((value >> 56) & 0xff));
}
/**
* @brief Parameter k for the Exponential Golomb algorihm to be used.
*
* The smaller this value, the smaller the minimum bit count for the Exp.
* Golomb generated affixes will be (at lowest index) however for the
* price of having higher maximum bit count of generated affixes (at highest
* index). Likewise increasing this parameter yields in smaller maximum bit
* count for the price of having higher minimum bit count.
*
* In practice that means: a good value for k depends on the expected amount
* of devices to be exposed by one export. For a small amount of devices k
* should be small, for a large amount of devices k might be increased
* instead. The default of k=0 should be fine for most users though.
*
* @b IMPORTANT: In case this ever becomes a runtime parameter; the value of
* k should not change as long as guest is still running! Because that would
* cause completely different inode numbers to be generated on guest.
*/
#define EXP_GOLOMB_K 0
/**
* @brief Exponential Golomb algorithm for arbitrary k (including k=0).
*
* The Exponential Golomb algorithm generates @b prefixes (@b not suffixes!)
* with growing length and with the mathematical property of being
* "prefix-free". The latter means the generated prefixes can be prepended
* in front of arbitrary numbers and the resulting concatenated numbers are
* guaranteed to be always unique.
*
* This is a minor adjustment to the original Exp. Golomb algorithm in the
* sense that lowest allowed index (@param n) starts with 1, not with zero.
*
* @param n - natural number (or index) of the prefix to be generated
* (1, 2, 3, ...)
* @param k - parameter k of Exp. Golomb algorithm to be used
* (see comment on EXP_GOLOMB_K macro for details about k)
*/
static VariLenAffix expGolombEncode(uint64_t n, int k)
{
const uint64_t value = n + (1 << k) - 1;
const int bits = (int) log2(value) + 1;
return (VariLenAffix) {
.type = AffixType_Prefix,
.value = value,
.bits = bits + MAX((bits - 1 - k), 0)
};
}
/**
* @brief Converts a suffix into a prefix, or a prefix into a suffix.
*
* Simply mirror all bits of the affix value, for the purpose to preserve
* respectively the mathematical "prefix-free" or "suffix-free" property
* after the conversion.
*
* If a passed prefix is suitable to create unique numbers, then the
* returned suffix is suitable to create unique numbers as well (and vice
* versa).
*/
static VariLenAffix invertAffix(const VariLenAffix *affix)
{
return (VariLenAffix) {
.type =
(affix->type == AffixType_Suffix) ?
AffixType_Prefix : AffixType_Suffix,
.value =
mirror64bit(affix->value) >>
((sizeof(affix->value) * 8) - affix->bits),
.bits = affix->bits
};
}
/**
* @brief Generates suffix numbers with "suffix-free" property.
*
* This is just a wrapper function on top of the Exp. Golomb algorithm.
*
* Since the Exp. Golomb algorithm generates prefixes, but we need suffixes,
* this function converts the Exp. Golomb prefixes into appropriate suffixes
* which are still suitable for generating unique numbers.
*
* @param n - natural number (or index) of the suffix to be generated
* (1, 2, 3, ...)
*/
static VariLenAffix affixForIndex(uint64_t index)
{
VariLenAffix prefix;
prefix = expGolombEncode(index, EXP_GOLOMB_K);
return invertAffix(&prefix); /* convert prefix to suffix */
}
/* creative abuse of tb_hash_func7, which is based on xxhash */
static uint32_t qpp_hash(QppEntry e)
{
return qemu_xxhash7(e.ino_prefix, e.dev, 0, 0, 0);
}
static uint32_t qpf_hash(QpfEntry e)
{
return qemu_xxhash7(e.ino, e.dev, 0, 0, 0);
}
static bool qpd_cmp_func(const void *obj, const void *userp)
{
const QpdEntry *e1 = obj, *e2 = userp;
return e1->dev == e2->dev;
}
static bool qpp_cmp_func(const void *obj, const void *userp)
{
const QppEntry *e1 = obj, *e2 = userp;
return e1->dev == e2->dev && e1->ino_prefix == e2->ino_prefix;
}
static bool qpf_cmp_func(const void *obj, const void *userp)
{
const QpfEntry *e1 = obj, *e2 = userp;
return e1->dev == e2->dev && e1->ino == e2->ino;
}
static void qp_table_remove(void *p, uint32_t h, void *up)
{
g_free(p);
}
static void qp_table_destroy(struct qht *ht)
{
if (!ht || !ht->map) {
return;
}
qht_iter(ht, qp_table_remove, NULL);
qht_destroy(ht);
}
static void qpd_table_init(struct qht *ht)
{
qht_init(ht, qpd_cmp_func, 1, QHT_MODE_AUTO_RESIZE);
}
static void qpp_table_init(struct qht *ht)
{
qht_init(ht, qpp_cmp_func, 1, QHT_MODE_AUTO_RESIZE);
}
static void qpf_table_init(struct qht *ht)
{
qht_init(ht, qpf_cmp_func, 1 << 16, QHT_MODE_AUTO_RESIZE);
}
/*
* Returns how many (high end) bits of inode numbers of the passed fs
* device shall be used (in combination with the device number) to
* generate hash values for qpp_table entries.
*
* This function is required if variable length suffixes are used for inode
* number mapping on guest level. Since a device may end up having multiple
* entries in qpp_table, each entry most probably with a different suffix
* length, we thus need this function in conjunction with qpd_table to
* "agree" about a fix amount of bits (per device) to be always used for
* generating hash values for the purpose of accessing qpp_table in order
* get consistent behaviour when accessing qpp_table.
*/
static int qid_inode_prefix_hash_bits(V9fsPDU *pdu, dev_t dev)
{
QpdEntry lookup = {
.dev = dev
}, *val;
uint32_t hash = dev;
VariLenAffix affix;
val = qht_lookup(&pdu->s->qpd_table, &lookup, hash);
if (!val) {
val = g_malloc0(sizeof(QpdEntry));
*val = lookup;
affix = affixForIndex(pdu->s->qp_affix_next);
val->prefix_bits = affix.bits;
qht_insert(&pdu->s->qpd_table, val, hash, NULL);
pdu->s->qp_ndevices++;
}
return val->prefix_bits;
}
/**
* @brief Slow / full mapping host inode nr -> guest inode nr.
*
* This function performs a slower and much more costly remapping of an
* original file inode number on host to an appropriate different inode
* number on guest. For every (dev, inode) combination on host a new
* sequential number is generated, cached and exposed as inode number on
* guest.
*
* This is just a "last resort" fallback solution if the much faster/cheaper
* qid_path_suffixmap() failed. In practice this slow / full mapping is not
* expected ever to be used at all though.
*
* @see qid_path_suffixmap() for details
*
*/
static int qid_path_fullmap(V9fsPDU *pdu, const struct stat *stbuf,
uint64_t *path)
{
QpfEntry lookup = {
.dev = stbuf->st_dev,
.ino = stbuf->st_ino
}, *val;
uint32_t hash = qpf_hash(lookup);
VariLenAffix affix;
val = qht_lookup(&pdu->s->qpf_table, &lookup, hash);
if (!val) {
if (pdu->s->qp_fullpath_next == 0) {
/* no more files can be mapped :'( */
error_report_once(
"9p: No more prefixes available for remapping inodes from "
"host to guest."
);
return -ENFILE;
}
val = g_malloc0(sizeof(QppEntry));
*val = lookup;
/* new unique inode and device combo */
affix = affixForIndex(
1ULL << (sizeof(pdu->s->qp_affix_next) * 8)
);
val->path = (pdu->s->qp_fullpath_next++ << affix.bits) | affix.value;
pdu->s->qp_fullpath_next &= ((1ULL << (64 - affix.bits)) - 1);
qht_insert(&pdu->s->qpf_table, val, hash, NULL);
}
*path = val->path;
return 0;
}
/**
* @brief Quick mapping host inode nr -> guest inode nr.
*
* This function performs quick remapping of an original file inode number
* on host to an appropriate different inode number on guest. This remapping
* of inodes is required to avoid inode nr collisions on guest which would
* happen if the 9p export contains more than 1 exported file system (or
* more than 1 file system data set), because unlike on host level where the
* files would have different device nrs, all files exported by 9p would
* share the same device nr on guest (the device nr of the virtual 9p device
* that is).
*
* Inode remapping is performed by chopping off high end bits of the original
* inode number from host, shifting the result upwards and then assigning a
* generated suffix number for the low end bits, where the same suffix number
* will be shared by all inodes with the same device id AND the same high end
* bits that have been chopped off. That approach utilizes the fact that inode
* numbers very likely share the same high end bits (i.e. due to their common
* sequential generation by file systems) and hence we only have to generate
* and track a very limited amount of suffixes in practice due to that.
*
* We generate variable size suffixes for that purpose. The 1st generated
* suffix will only have 1 bit and hence we only need to chop off 1 bit from
* the original inode number. The subsequent suffixes being generated will
* grow in (bit) size subsequently, i.e. the 2nd and 3rd suffix being
* generated will have 3 bits and hence we have to chop off 3 bits from their
* original inodes, and so on. That approach of using variable length suffixes
* (i.e. over fixed size ones) utilizes the fact that in practice only a very
* limited amount of devices are shared by the same export (e.g. typically
* less than 2 dozen devices per 9p export), so in practice we need to chop
* off less bits than with fixed size prefixes and yet are flexible to add
* new devices at runtime below host's export directory at any time without
* having to reboot guest nor requiring to reconfigure guest for that. And due
* to the very limited amount of original high end bits that we chop off that
* way, the total amount of suffixes we need to generate is less than by using
* fixed size prefixes and hence it also improves performance of the inode
* remapping algorithm, and finally has the nice side effect that the inode
* numbers on guest will be much smaller & human friendly. ;-)
*/
static int qid_path_suffixmap(V9fsPDU *pdu, const struct stat *stbuf,
uint64_t *path)
{
const int ino_hash_bits = qid_inode_prefix_hash_bits(pdu, stbuf->st_dev);
QppEntry lookup = {
.dev = stbuf->st_dev,
.ino_prefix = (uint16_t) (stbuf->st_ino >> (64 - ino_hash_bits))
}, *val;
uint32_t hash = qpp_hash(lookup);
val = qht_lookup(&pdu->s->qpp_table, &lookup, hash);
if (!val) {
if (pdu->s->qp_affix_next == 0) {
/* we ran out of affixes */
warn_report_once(
"9p: Potential degraded performance of inode remapping"
);
return -ENFILE;
}
val = g_malloc0(sizeof(QppEntry));
*val = lookup;
/* new unique inode affix and device combo */
val->qp_affix_index = pdu->s->qp_affix_next++;
val->qp_affix = affixForIndex(val->qp_affix_index);
qht_insert(&pdu->s->qpp_table, val, hash, NULL);
}
/* assuming generated affix to be suffix type, not prefix */
*path = (stbuf->st_ino << val->qp_affix.bits) | val->qp_affix.value;
return 0;
}
static int stat_to_qid(V9fsPDU *pdu, const struct stat *stbuf, V9fsQID *qidp)
{
int err;
size_t size;
if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) {
/* map inode+device to qid path (fast path) */
err = qid_path_suffixmap(pdu, stbuf, &qidp->path);
if (err == -ENFILE) {
/* fast path didn't work, fall back to full map */
err = qid_path_fullmap(pdu, stbuf, &qidp->path);
}
if (err) {
return err;
}
} else {
if (pdu->s->dev_id != stbuf->st_dev) {
if (pdu->s->ctx.export_flags & V9FS_FORBID_MULTIDEVS) {
error_report_once(
"9p: Multiple devices detected in same VirtFS export. "
"Access of guest to additional devices is (partly) "
"denied due to virtfs option 'multidevs=forbid' being "
"effective."
);
return -ENODEV;
} else {
warn_report_once(
"9p: Multiple devices detected in same VirtFS export, "
"which might lead to file ID collisions and severe "
"misbehaviours on guest! You should either use a "
"separate export for each device shared from host or "
"use virtfs option 'multidevs=remap'!"
);
}
}
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;
}
return 0;
}
static int coroutine_fn 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;
}
err = stat_to_qid(pdu, &stbuf, qidp);
if (err < 0) {
return err;
}
return 0;
}
static int coroutine_fn dirent_to_qid(V9fsPDU *pdu, V9fsFidState *fidp,
struct dirent *dent, V9fsQID *qidp)
{
struct stat stbuf;
V9fsPath path;
int err;
v9fs_path_init(&path);
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_qid(pdu, &stbuf, qidp);
out:
v9fs_path_free(&path);
return err;
}
V9fsPDU *pdu_alloc(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;
}
void pdu_free(V9fsPDU *pdu)
{
V9fsState *s = pdu->s;
g_assert(!pdu->cancelled);
QLIST_REMOVE(pdu, next);
QLIST_INSERT_HEAD(&s->free_list, pdu, next);
}
static void coroutine_fn pdu_complete(V9fsPDU *pdu, ssize_t len)
{
int8_t id = pdu->id + 1; /* Response */
V9fsState *s = pdu->s;
int ret;
/*
* The 9p spec requires that successfully cancelled pdus receive no reply.
* Sending a reply would confuse clients because they would
* assume that any EINTR is the actual result of the operation,
* rather than a consequence of the cancellation. However, if
* the operation completed (succesfully or with an error other
* than caused be cancellation), we do send out that reply, both
* for efficiency and to avoid confusing the rest of the state machine
* that assumes passing a non-error here will mean a successful
* transmission of the reply.
*/
bool discard = pdu->cancelled && len == -EINTR;
if (discard) {
trace_v9fs_rcancel(pdu->tag, pdu->id);
pdu->size = 0;
goto out_notify;
}
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);
ret = pdu_marshal(pdu, len, "s", &str);
if (ret < 0) {
goto out_notify;
}
len += ret;
id = P9_RERROR;
}
ret = pdu_marshal(pdu, len, "d", err);
if (ret < 0) {
goto out_notify;
}
len += ret;
if (s->proto_version == V9FS_PROTO_2000L) {
id = P9_RLERROR;
}
trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */
}
/* fill out the header */
if (pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag) < 0) {
goto out_notify;
}
/* keep these in sync */
pdu->size = len;
pdu->id = id;
out_notify:
pdu->s->transport->push_and_notify(pdu);
/* Now wakeup anybody waiting in flush for this request */
if (!qemu_co_queue_next(&pdu->complete)) {
pdu_free(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->size && 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 == 0xff &&
stat->qid.version == (uint32_t) -1 &&
stat->qid.path == (uint64_t) -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_init(V9fsStat *stat)
{
v9fs_string_init(&stat->name);
v9fs_string_init(&stat->uid);
v9fs_string_init(&stat->gid);
v9fs_string_init(&stat->muid);
v9fs_string_init(&stat->extension);
}
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 coroutine_fn stat_to_v9stat(V9fsPDU *pdu, V9fsPath *path,
const char *basename,
const struct stat *stbuf,
V9fsStat *v9stat)
{
int err;
memset(v9stat, 0, sizeof(*v9stat));
err = stat_to_qid(pdu, stbuf, &v9stat->qid);
if (err < 0) {
return err;
}
v9stat->mode = stat_to_v9mode(stbuf);
v9stat->atime = stbuf->st_atime;
v9stat->mtime = stbuf->st_mtime;
v9stat->length = stbuf->st_size;
v9fs_string_free(&v9stat->uid);
v9fs_string_free(&v9stat->gid);
v9fs_string_free(&v9stat->muid);
v9stat->n_uid = stbuf->st_uid;
v9stat->n_gid = stbuf->st_gid;
v9stat->n_muid = 0;
v9fs_string_free(&v9stat->extension);
if (v9stat->mode & P9_STAT_MODE_SYMLINK) {
err = v9fs_co_readlink(pdu, path, &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);
}
v9fs_string_sprintf(&v9stat->name, "%s", basename);
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 int stat_to_v9stat_dotl(V9fsPDU *pdu, 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;
return stat_to_qid(pdu, stbuf, &v9lstat->qid);
}
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_path_sprintf(dst, "%s%s", src->data, str.data + len);
v9fs_path_free(&str);
}
static inline bool is_ro_export(FsContext *ctx)
{
return ctx->export_flags & V9FS_RDONLY;
}
static void coroutine_fn v9fs_version(void *opaque)
{
ssize_t err;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
V9fsString version;
size_t offset = 7;
v9fs_string_init(&version);
err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version);
if (err < 0) {
goto out;
}
trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data);
virtfs_reset(pdu);
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");
/* skip min. msize check, reporting invalid version has priority */
goto marshal;
}
if (s->msize < P9_MIN_MSIZE) {
err = -EMSGSIZE;
error_report(
"9pfs: Client requested msize < minimum msize ("
stringify(P9_MIN_MSIZE) ") supported by this server."
);
goto out;
}
marshal:
err = pdu_marshal(pdu, offset, "ds", s->msize, &version);
if (err < 0) {
goto out;
}
err += offset;
trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data);
out:
pdu_complete(pdu, err);
v9fs_string_free(&version);
}
static void coroutine_fn 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;
v9fs_string_init(&uname);
v9fs_string_init(&aname);
err = pdu_unmarshal(pdu, offset, "ddssd", &fid,
&afid, &uname, &aname, &n_uname);
if (err < 0) {
goto out_nofid;
}
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;
}
/*
* disable migration if we haven't done already.
* attach could get called multiple times for the same export.
*/
if (!s->migration_blocker) {
error_setg(&s->migration_blocker,
"Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'",
s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag);
err = migrate_add_blocker(s->migration_blocker, NULL);
if (err < 0) {
error_free(s->migration_blocker);
s->migration_blocker = NULL;
clunk_fid(s, fid);
goto out;
}
s->root_fid = fid;
}
err = pdu_marshal(pdu, offset, "Q", &qid);
if (err < 0) {
clunk_fid(s, fid);
goto out;
}
err += offset;
memcpy(&s->root_qid, &qid, sizeof(qid));
trace_v9fs_attach_return(pdu->tag, pdu->id,
qid.type, qid.version, qid.path);
out:
put_fid(pdu, fidp);
out_nofid:
pdu_complete(pdu, err);
v9fs_string_free(&uname);
v9fs_string_free(&aname);
}
static void coroutine_fn 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;
char *basename;
err = pdu_unmarshal(pdu, offset, "d", &fid);
if (err < 0) {
goto out_nofid;
}
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;
}
basename = g_path_get_basename(fidp->path.data);
err = stat_to_v9stat(pdu, &fidp->path, basename, &stbuf, &v9stat);
g_free(basename);
if (err < 0) {
goto out;
}
err = pdu_marshal(pdu, offset, "wS", 0, &v9stat);
if (err < 0) {
v9fs_stat_free(&v9stat);
goto out;
}
trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode,
v9stat.atime, v9stat.mtime, v9stat.length);
err += offset;
v9fs_stat_free(&v9stat);
out:
put_fid(pdu, fidp);
out_nofid:
pdu_complete(pdu, err);
}
static void coroutine_fn 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;
retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask);
if (retval < 0) {
goto out_nofid;
}
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;
}
retval = stat_to_v9stat_dotl(pdu, &stbuf, &v9stat_dotl);
if (retval < 0) {
goto out;
}
/* 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);
switch (retval) {
case 0:
/* we have valid st_gen: update result mask */
v9stat_dotl.st_result_mask |= P9_STATS_GEN;
break;
case -EINTR:
/* request cancelled, e.g. by Tflush */
goto out;
default:
/* failed to get st_gen: not fatal, ignore */
break;
}
}
retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl);
if (retval < 0) {
goto out;
}
retval += offset;
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:
pdu_complete(pdu, retval);
}
/* Attribute flags */
#define P9_ATTR_MODE (1 << 0)
#define P9_ATTR_UID (1 << 1)
#define P9_ATTR_GID (1 << 2)
#define P9_ATTR_SIZE (1 << 3)
#define P9_ATTR_ATIME (1 << 4)
#define P9_ATTR_MTIME (1 << 5)
#define P9_ATTR_CTIME (1 << 6)
#define P9_ATTR_ATIME_SET (1 << 7)
#define P9_ATTR_MTIME_SET (1 << 8)
#define P9_ATTR_MASK 127
static void coroutine_fn v9fs_setattr(void *opaque)
{
int err = 0;
int32_t fid;
V9fsFidState *fidp;
size_t offset = 7;
V9fsIattr v9iattr;
V9fsPDU *pdu = opaque;
err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr);
if (err < 0) {
goto out_nofid;
}
trace_v9fs_setattr(pdu->tag, pdu->id, fid,
v9iattr.valid, v9iattr.mode, v9iattr.uid, v9iattr.gid,
v9iattr.size, v9iattr.atime_sec, v9iattr.mtime_sec);
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
if (v9iattr.valid & P9_ATTR_MODE) {
err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode);
if (err < 0) {
goto out;
}
}
if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) {
struct timespec times[2];
if (v9iattr.valid & P9_ATTR_ATIME) {
if (v9iattr.valid & P9_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 & P9_ATTR_MTIME) {
if (v9iattr.valid & P9_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 & (P9_ATTR_UID | P9_ATTR_GID)) ||
((v9iattr.valid & P9_ATTR_CTIME)
&& !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) {
if (!(v9iattr.valid & P9_ATTR_UID)) {
v9iattr.uid = -1;
}
if (!(v9iattr.valid & P9_ATTR_GID)) {
v9iattr.gid = -1;
}
err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid,
v9iattr.gid);
if (err < 0) {
goto out;
}
}
if (v9iattr.valid & (P9_ATTR_SIZE)) {
err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size);
if (err < 0) {
goto out;
}
}
err = offset;
trace_v9fs_setattr_return(pdu->tag, pdu->id);
out:
put_fid(pdu, fidp);
out_nofid:
pdu_complete(pdu, err);
}
static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids)
{
int i;
ssize_t err;
size_t offset = 7;
err = pdu_marshal(pdu, offset, "w", nwnames);
if (err < 0) {
return err;
}
offset += err;
for (i = 0; i < nwnames; i++) {
err = pdu_marshal(pdu, offset, "Q", &qids[i]);
if (err < 0) {
return err;
}
offset += err;
}
return offset;
}
static bool name_is_illegal(const char *name)
{
return !*name || strchr(name, '/') != NULL;
}
static bool not_same_qid(const V9fsQID *qid1, const V9fsQID *qid2)
{
return
qid1->type != qid2->type ||
qid1->version != qid2->version ||
qid1->path != qid2->path;
}
static void coroutine_fn 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;
V9fsQID qid;
err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames);
if (err < 0) {
pdu_complete(pdu, err);
return ;
}
offset += err;
trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames);
if (nwnames && nwnames <= P9_MAXWELEM) {
wnames = g_new0(V9fsString, nwnames);
qids = g_new0(V9fsQID, nwnames);
for (i = 0; i < nwnames; i++) {
err = pdu_unmarshal(pdu, offset, "s", &wnames[i]);
if (err < 0) {
goto out_nofid;
}
if (name_is_illegal(wnames[i].data)) {
err = -ENOENT;
goto out_nofid;
}
offset += err;
}
} 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);
err = fid_to_qid(pdu, fidp, &qid);
if (err < 0) {
goto out;
}
/*
* 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++) {
if (not_same_qid(&pdu->s->root_qid, &qid) ||
strcmp("..", wnames[name_idx].data)) {
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;
}
err = stat_to_qid(pdu, &stbuf, &qid);
if (err < 0) {
goto out;
}
v9fs_path_copy(&dpath, &path);
}
memcpy(&qids[name_idx], &qid, sizeof(qid));
}
if (fid == newfid) {
if (fidp->fid_type != P9_FID_NONE) {
err = -EINVAL;
goto out;
}
v9fs_path_write_lock(s);
v9fs_path_copy(&fidp->path, &path);
v9fs_path_unlock(s);
} 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:
pdu_complete(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 coroutine_fn 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)) {
if (stbuf.f_bsize) {
iounit = stbuf.f_bsize;
iounit *= (s->msize - P9_IOHDRSZ) / stbuf.f_bsize;
}
}
if (!iounit) {
iounit = s->msize - P9_IOHDRSZ;
}
return iounit;
}
static void coroutine_fn 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) {
err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode);
} else {
uint8_t modebyte;
err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte);
mode = modebyte;
}
if (err < 0) {
goto out_nofid;
}
trace_v9fs_open(pdu->tag, pdu->id, fid, mode);
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
if (fidp->fid_type != P9_FID_NONE) {
err = -EINVAL;
goto out;
}
err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
if (err < 0) {
goto out;
}
err = stat_to_qid(pdu, &stbuf, &qid);
if (err < 0) {
goto out;
}
if (S_ISDIR(stbuf.st_mode)) {
err = v9fs_co_opendir(pdu, fidp);
if (err < 0) {
goto out;
}
fidp->fid_type = P9_FID_DIR;
err = pdu_marshal(pdu, offset, "Qd", &qid, 0);
if (err < 0) {
goto out;
}
err += offset;
} else {
if (s->proto_version == V9FS_PROTO_2000L) {
flags = get_dotl_openflags(s, mode);
} else {
flags = omode_to_uflags(mode);
}
if (is_ro_export(&s->ctx)) {
if (mode & O_WRONLY || mode & O_RDWR ||
mode & O_APPEND || mode & O_TRUNC) {
err = -EROFS;
goto out;
}
}
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);
err = pdu_marshal(pdu, offset, "Qd", &qid, iounit);
if (err < 0) {
goto out;
}
err += offset;
}
trace_v9fs_open_return(pdu->tag, pdu->id,
qid.type, qid.version, qid.path, iounit);
out:
put_fid(pdu, fidp);
out_nofid:
pdu_complete(pdu, err);
}
static void coroutine_fn 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;
v9fs_string_init(&name);
err = pdu_unmarshal(pdu, offset, "dsddd", &dfid,
&name, &flags, &mode, &gid);
if (err < 0) {
goto out_nofid;
}
trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid);
if (name_is_illegal(name.data)) {
err = -ENOENT;
goto out_nofid;
}
if (!strcmp(".", name.data) || !strcmp("..", name.data)) {
err = -EEXIST;
goto out_nofid;
}
fidp = get_fid(pdu, dfid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
if (fidp->fid_type != P9_FID_NONE) {
err = -EINVAL;
goto out;
}
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);
err = stat_to_qid(pdu, &stbuf, &qid);
if (err < 0) {
goto out;
}
err = pdu_marshal(pdu, offset, "Qd", &qid, iounit);
if (err < 0) {
goto out;
}
err += offset;
trace_v9fs_lcreate_return(pdu->tag, pdu->id,
qid.type, qid.version, qid.path, iounit);
out:
put_fid(pdu, fidp);
out_nofid:
pdu_complete(pdu, err);
v9fs_string_free(&name);
}
static void coroutine_fn v9fs_fsync(void *opaque)
{
int err;
int32_t fid;
int datasync;
size_t offset = 7;
V9fsFidState *fidp;
V9fsPDU *pdu = opaque;
err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync);
if (err < 0) {
goto out_nofid;
}
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:
pdu_complete(pdu, err);
}
static void coroutine_fn v9fs_clunk(void *opaque)
{
int err;
int32_t fid;
size_t offset = 7;
V9fsFidState *fidp;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
err = pdu_unmarshal(pdu, offset, "d", &fid);
if (err < 0) {
goto out_nofid;
}
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 = put_fid(pdu, fidp);
if (!err) {
err = offset;
}
out_nofid:
pdu_complete(pdu, err);
}
/*
* Create a QEMUIOVector for a sub-region of PDU iovecs
*
* @qiov: uninitialized QEMUIOVector
* @skip: number of bytes to skip from beginning of PDU
* @size: number of bytes to include
* @is_write: true - write, false - read
*
* The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up
* with qemu_iovec_destroy().
*/
static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu,
size_t skip, size_t size,
bool is_write)
{
QEMUIOVector elem;
struct iovec *iov;
unsigned int niov;
if (is_write) {
pdu->s->transport->init_out_iov_from_pdu(pdu, &iov, &niov, size + skip);
} else {
pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, size + skip);
}
qemu_iovec_init_external(&elem, iov, niov);
qemu_iovec_init(qiov, niov);
qemu_iovec_concat(qiov, &elem, skip, size);
}
static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp,
uint64_t off, uint32_t max_count)
{
ssize_t err;
size_t offset = 7;
uint64_t read_count;
QEMUIOVector qiov_full;
if (fidp->fs.xattr.len < off) {
read_count = 0;
} else {
read_count = fidp->fs.xattr.len - off;
}
if (read_count > max_count) {
read_count = max_count;
}
err = pdu_marshal(pdu, offset, "d", read_count);
if (err < 0) {
return err;
}
offset += err;
v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, read_count, false);
err = v9fs_pack(qiov_full.iov, qiov_full.niov, 0,
((char *)fidp->fs.xattr.value) + off,
read_count);
qemu_iovec_destroy(&qiov_full);
if (err < 0) {
return err;
}
offset += err;
return offset;
}
static int coroutine_fn v9fs_do_readdir_with_stat(V9fsPDU *pdu,
V9fsFidState *fidp,
uint32_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;
/* save the directory position */
saved_dir_pos = v9fs_co_telldir(pdu, fidp);
if (saved_dir_pos < 0) {
return saved_dir_pos;
}
while (1) {
v9fs_path_init(&path);
v9fs_readdir_lock(&fidp->fs.dir);
err = v9fs_co_readdir(pdu, fidp, &dent);
if (err || !dent) {
break;
}
err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path);
if (err < 0) {
break;
}
err = v9fs_co_lstat(pdu, &path, &stbuf);
if (err < 0) {
break;
}
err = stat_to_v9stat(pdu, &path, dent->d_name, &stbuf, &v9stat);
if (err < 0) {
break;
}
if ((count + v9stat.size + 2) > max_count) {
v9fs_readdir_unlock(&fidp->fs.dir);
/* 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);
return count;
}
/* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
len = pdu_marshal(pdu, 11 + count, "S", &v9stat);
v9fs_readdir_unlock(&fidp->fs.dir);
if (len < 0) {
v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
v9fs_stat_free(&v9stat);
v9fs_path_free(&path);
return len;
}
count += len;
v9fs_stat_free(&v9stat);
v9fs_path_free(&path);
saved_dir_pos = dent->d_off;
}
v9fs_readdir_unlock(&fidp->fs.dir);
v9fs_path_free(&path);
if (err < 0) {
return err;
}
return count;
}
static void coroutine_fn v9fs_read(void *opaque)
{
int32_t fid;
uint64_t off;
ssize_t err = 0;
int32_t count = 0;
size_t offset = 7;
uint32_t max_count;
V9fsFidState *fidp;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count);
if (err < 0) {
goto out_nofid;
}
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 = pdu_marshal(pdu, offset, "d", count);
if (err < 0) {
goto out;
}
err += offset + count;
} else if (fidp->fid_type == P9_FID_FILE) {
QEMUIOVector qiov_full;
QEMUIOVector qiov;
int32_t len;
v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false);
qemu_iovec_init(&qiov, qiov_full.niov);
do {
qemu_iovec_reset(&qiov);
qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count);
if (0) {
print_sg(qiov.iov, qiov.niov);
}
/* Loop in case of EINTR */
do {
len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, 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_free_iovec;
}
} while (count < max_count && len > 0);
err = pdu_marshal(pdu, offset, "d", count);
if (err < 0) {
goto out_free_iovec;
}
err += offset + count;
out_free_iovec:
qemu_iovec_destroy(&qiov);
qemu_iovec_destroy(&qiov_full);
} 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:
pdu_complete(pdu, err);
}
/**
* Returns size required in Rreaddir response for the passed dirent @p name.
*
* @param name - directory entry's name (i.e. file name, directory name)
* @returns required size in bytes
*/
size_t v9fs_readdir_response_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 coroutine_fn 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;
/* save the directory position */
saved_dir_pos = v9fs_co_telldir(pdu, fidp);
if (saved_dir_pos < 0) {
return saved_dir_pos;
}
while (1) {
v9fs_readdir_lock(&fidp->fs.dir);
err = v9fs_co_readdir(pdu, fidp, &dent);
if (err || !dent) {
break;
}
v9fs_string_init(&name);
v9fs_string_sprintf(&name, "%s", dent->d_name);
if ((count + v9fs_readdir_response_size(&name)) > max_count) {
v9fs_readdir_unlock(&fidp->fs.dir);
/* Ran out of buffer. Set dir back to old position and return */
v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
v9fs_string_free(&name);
return count;
}
if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) {
/*
* dirent_to_qid() implies expensive stat call for each entry,
* we must do that here though since inode remapping requires
* the device id, which in turn might be different for
* different entries; we cannot make any assumption to avoid
* that here.
*/
err = dirent_to_qid(pdu, fidp, dent, &qid);
if (err < 0) {
v9fs_readdir_unlock(&fidp->fs.dir);
v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
v9fs_string_free(&name);
return err;
}
} else {
/*
* 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. For the
* latter reason we don't call dirent_to_qid() here. Only drawback
* is that no multi-device export detection of stat_to_qid()
* would be done and provided as error to the user here. But
* user would get that error anyway when accessing those
* files/dirs through other ways.
*/
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);
v9fs_readdir_unlock(&fidp->fs.dir);
if (len < 0) {
v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
v9fs_string_free(&name);
return len;
}
count += len;
v9fs_string_free(&name);
saved_dir_pos = dent->d_off;
}
v9fs_readdir_unlock(&fidp->fs.dir);
if (err < 0) {
return err;
}
return count;
}
static void coroutine_fn v9fs_readdir(void *opaque)
{
int32_t fid;
V9fsFidState *fidp;
ssize_t retval = 0;
size_t offset = 7;
uint64_t initial_offset;
int32_t count;
uint32_t max_count;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
retval = pdu_unmarshal(pdu, offset, "dqd", &fid,
&initial_offset, &max_count);
if (retval < 0) {
goto out_nofid;
}
trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count);
/* Enough space for a R_readdir header: size[4] Rreaddir tag[2] count[4] */
if (max_count > s->msize - 11) {
max_count = s->msize - 11;
warn_report_once(
"9p: bad client: T_readdir with count > msize - 11"
);
}
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
retval = -EINVAL;
goto out_nofid;
}
if (!fidp->fs.dir.stream) {
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 = pdu_marshal(pdu, offset, "d", count);
if (retval < 0) {
goto out;
}
retval += count + offset;
trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval);
out:
put_fid(pdu, fidp);
out_nofid:
pdu_complete(pdu, retval);
}
static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp,
uint64_t off, uint32_t count,
struct iovec *sg, int cnt)
{
int i, to_copy;
ssize_t err = 0;
uint64_t write_count;
size_t offset = 7;
if (fidp->fs.xattr.len < off) {
return -ENOSPC;
}
write_count = fidp->fs.xattr.len - off;
if (write_count > count) {
write_count = count;
}
err = pdu_marshal(pdu, offset, "d", write_count);
if (err < 0) {
return err;
}
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;
}
return err;
}
static void coroutine_fn v9fs_write(void *opaque)
{
ssize_t err;
int32_t fid;
uint64_t off;
uint32_t count;
int32_t len = 0;
int32_t total = 0;
size_t offset = 7;
V9fsFidState *fidp;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
QEMUIOVector qiov_full;
QEMUIOVector qiov;
err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count);
if (err < 0) {
pdu_complete(pdu, err);
return;
}
offset += err;
v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true);
trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov);
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,
qiov_full.iov, qiov_full.niov);
goto out;
} else {
err = -EINVAL;
goto out;
}
qemu_iovec_init(&qiov, qiov_full.niov);
do {
qemu_iovec_reset(&qiov);
qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total);
if (0) {
print_sg(qiov.iov, qiov.niov);
}
/* Loop in case of EINTR */
do {
len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, 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_qiov;
}
} while (total < count && len > 0);
offset = 7;
err = pdu_marshal(pdu, offset, "d", total);
if (err < 0) {
goto out_qiov;
}
err += offset;
trace_v9fs_write_return(pdu->tag, pdu->id, total, err);
out_qiov:
qemu_iovec_destroy(&qiov);
out:
put_fid(pdu, fidp);
out_nofid:
qemu_iovec_destroy(&qiov_full);
pdu_complete(pdu, err);
}
static void coroutine_fn 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;
V9fsState *s = pdu->s;
v9fs_path_init(&path);
v9fs_string_init(&name);
v9fs_string_init(&extension);
err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name,
&perm, &mode, &extension);
if (err < 0) {
goto out_nofid;
}
trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode);
if (name_is_illegal(name.data)) {
err = -ENOENT;
goto out_nofid;
}
if (!strcmp(".", name.data) || !strcmp("..", name.data)) {
err = -EEXIST;
goto out_nofid;
}
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
if (fidp->fid_type != P9_FID_NONE) {
err = -EINVAL;
goto out;
}
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_write_lock(s);
v9fs_path_copy(&fidp->path, &path);
v9fs_path_unlock(s);
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_write_lock(s);
v9fs_path_copy(&fidp->path, &path);
v9fs_path_unlock(s);
} 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_write_lock(s);
v9fs_path_copy(&fidp->path, &path);
v9fs_path_unlock(s);
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_write_lock(s);
v9fs_path_copy(&fidp->path, &path);
v9fs_path_unlock(s);
} 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_write_lock(s);
v9fs_path_copy(&fidp->path, &path);
v9fs_path_unlock(s);
} 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_write_lock(s);
v9fs_path_copy(&fidp->path, &path);
v9fs_path_unlock(s);
} 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);
err = stat_to_qid(pdu, &stbuf, &qid);
if (err < 0) {
goto out;
}
err = pdu_marshal(pdu, offset, "Qd", &qid, iounit);
if (err < 0) {
goto out;
}
err += offset;
trace_v9fs_create_return(pdu->tag, pdu->id,
qid.type, qid.version, qid.path, iounit);
out:
put_fid(pdu, fidp);
out_nofid:
pdu_complete(pdu, err);
v9fs_string_free(&name);
v9fs_string_free(&extension);
v9fs_path_free(&path);
}
static void coroutine_fn 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;
v9fs_string_init(&name);
v9fs_string_init(&symname);
err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid);
if (err < 0) {
goto out_nofid;
}
trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid);
if (name_is_illegal(name.data)) {
err = -ENOENT;
goto out_nofid;
}
if (!strcmp(".", name.data) || !strcmp("..", name.data)) {
err = -EEXIST;
goto out_nofid;
}
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;
}
err = stat_to_qid(pdu, &stbuf, &qid);
if (err < 0) {
goto out;
}
err = pdu_marshal(pdu, offset, "Q", &qid);
if (err < 0) {
goto out;
}
err += offset;
trace_v9fs_symlink_return(pdu->tag, pdu->id,
qid.type, qid.version, qid.path);
out:
put_fid(pdu, dfidp);
out_nofid:
pdu_complete(pdu, err);
v9fs_string_free(&name);
v9fs_string_free(&symname);
}
static void coroutine_fn v9fs_flush(void *opaque)
{
ssize_t err;
int16_t tag;
size_t offset = 7;
V9fsPDU *cancel_pdu = NULL;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
err = pdu_unmarshal(pdu, offset, "w", &tag);
if (err < 0) {
pdu_complete(pdu, err);
return;
}
trace_v9fs_flush(pdu->tag, pdu->id, tag);
if (pdu->tag == tag) {
warn_report("the guest sent a self-referencing 9P flush request");
} else {
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, NULL);
if (!qemu_co_queue_next(&cancel_pdu->complete)) {
cancel_pdu->cancelled = 0;
pdu_free(cancel_pdu);
}
}
pdu_complete(pdu, 7);
}
static void coroutine_fn v9fs_link(void *opaque)
{
V9fsPDU *pdu = opaque;
int32_t dfid, oldfid;
V9fsFidState *dfidp, *oldfidp;
V9fsString name;
size_t offset = 7;
int err = 0;
v9fs_string_init(&name);
err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name);
if (err < 0) {
goto out_nofid;
}
trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data);
if (name_is_illegal(name.data)) {
err = -ENOENT;
goto out_nofid;
}
if (!strcmp(".", name.data) || !strcmp("..", name.data)) {
err = -EEXIST;
goto out_nofid;
}
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;
}
put_fid(pdu, oldfidp);
out:
put_fid(pdu, dfidp);
out_nofid:
v9fs_string_free(&name);
pdu_complete(pdu, err);
}
/* Only works with path name based fid */
static void coroutine_fn v9fs_remove(void *opaque)
{
int32_t fid;
int err = 0;
size_t offset = 7;
V9fsFidState *fidp;
V9fsPDU *pdu = opaque;
err = pdu_unmarshal(pdu, offset, "d", &fid);
if (err < 0) {
goto out_nofid;
}
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:
pdu_complete(pdu, err);
}
static void coroutine_fn v9fs_unlinkat(void *opaque)
{
int err = 0;
V9fsString name;
int32_t dfid, flags, rflags = 0;
size_t offset = 7;
V9fsPath path;
V9fsFidState *dfidp;
V9fsPDU *pdu = opaque;
v9fs_string_init(&name);
err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags);
if (err < 0) {
goto out_nofid;
}
if (name_is_illegal(name.data)) {
err = -ENOENT;
goto out_nofid;
}
if (!strcmp(".", name.data)) {
err = -EINVAL;
goto out_nofid;
}
if (!strcmp("..", name.data)) {
err = -ENOTEMPTY;
goto out_nofid;
}
if (flags & ~P9_DOTL_AT_REMOVEDIR) {
err = -EINVAL;
goto out_nofid;
}
if (flags & P9_DOTL_AT_REMOVEDIR) {
rflags |= AT_REMOVEDIR;
}
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, rflags);
if (!err) {
err = offset;
}
out_err:
put_fid(pdu, dfidp);
v9fs_path_free(&path);
out_nofid:
pdu_complete(pdu, err);
v9fs_string_free(&name);
}
/* Only works with path name based fid */
static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp,
int32_t newdirfid,
V9fsString *name)
{
int err = 0;
V9fsPath new_path;
V9fsFidState *tfidp;
V9fsState *s = pdu->s;
V9fsFidState *dirfidp = NULL;
v9fs_path_init(&new_path);
if (newdirfid != -1) {
dirfidp = get_fid(pdu, newdirfid);
if (dirfidp == NULL) {
return -ENOENT;
}
if (fidp->fid_type != P9_FID_NONE) {
err = -EINVAL;
goto out;
}
err = v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path);
if (err < 0) {
goto out;
}
} else {
char *dir_name = g_path_get_dirname(fidp->path.data);
V9fsPath dir_path;
v9fs_path_init(&dir_path);
v9fs_path_sprintf(&dir_path, "%s", dir_name);
g_free(dir_name);
err = v9fs_co_name_to_path(pdu, &dir_path, name->data, &new_path);
v9fs_path_free(&dir_path);
if (err < 0) {
goto out;
}
}
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);
return err;
}
/* Only works with path name based fid */
static void coroutine_fn 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;
v9fs_string_init(&name);
err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name);
if (err < 0) {
goto out_nofid;
}
if (name_is_illegal(name.data)) {
err = -ENOENT;
goto out_nofid;
}
if (!strcmp(".", name.data) || !strcmp("..", name.data)) {
err = -EISDIR;
goto out_nofid;
}
fidp = get_fid(pdu, fid);
if (fidp == NULL) {
err = -ENOENT;
goto out_nofid;
}
if (fidp->fid_type != P9_FID_NONE) {
err = -EINVAL;
goto out;
}
/* 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:
pdu_complete(pdu, err);
v9fs_string_free(&name);
}
static int coroutine_fn 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;
int err;
v9fs_path_init(&oldpath);
v9fs_path_init(&newpath);
err = v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath);
if (err < 0) {
goto out;
}
err = v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath);
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(&oldpath, &tfidp->path)) {
/* replace the name */
v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data));
}
}
out:
v9fs_path_free(&oldpath);
v9fs_path_free(&newpath);
return err;
}
static int coroutine_fn 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 */
err = 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 coroutine_fn 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;
v9fs_string_init(&old_name);
v9fs_string_init(&new_name);
err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid,
&old_name, &newdirfid, &new_name);
if (err < 0) {
goto out_err;
}
if (name_is_illegal(old_name.data) || name_is_illegal(new_name.data)) {
err = -ENOENT;
goto out_err;
}
if (!strcmp(".", old_name.data) || !strcmp("..", old_name.data) ||
!strcmp(".", new_name.data) || !strcmp("..", new_name.data)) {
err = -EISDIR;
goto out_err;
}
v9fs_path_write_lock(s);
err = v9fs_complete_renameat(pdu, olddirfid,
&old_name, newdirfid, &new_name);
v9fs_path_unlock(s);
if (!err) {
err = offset;
}
out_err:
pdu_complete(pdu, err);
v9fs_string_free(&old_name);
v9fs_string_free(&new_name);
}
static void coroutine_fn 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;
v9fs_stat_init(&v9stat);
err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat);
if (err < 0) {
goto out_nofid;
}
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) {
v9fs_path_write_lock(s);
err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name);
v9fs_path_unlock(s);
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);
pdu_complete(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 coroutine_fn 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;
retval = pdu_unmarshal(pdu, offset, "d", &fid);
if (retval < 0) {
goto out_nofid;
}
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 = v9fs_fill_statfs(s, pdu, &stbuf);
if (retval < 0) {
goto out;
}
retval += offset;
out:
put_fid(pdu, fidp);
out_nofid:
pdu_complete(pdu, retval);
}
static void coroutine_fn 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;
v9fs_string_init(&name);
err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode,
&major, &minor, &gid);
if (err < 0) {
goto out_nofid;
}
trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor);
if (name_is_illegal(name.data)) {
err = -ENOENT;
goto out_nofid;
}
if (!strcmp(".", name.data) || !strcmp("..", name.data)) {
err = -EEXIST;
goto out_nofid;
}
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;
}
err = stat_to_qid(pdu, &stbuf, &qid);
if (err < 0) {
goto out;
}
err = pdu_marshal(pdu, offset, "Q", &qid);
if (err < 0) {
goto out;
}
err += offset;
trace_v9fs_mknod_return(pdu->tag, pdu->id,
qid.type, qid.version, qid.path);
out:
put_fid(pdu, fidp);
out_nofid:
pdu_complete(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 coroutine_fn v9fs_lock(void *opaque)
{
V9fsFlock flock;
size_t offset = 7;
struct stat stbuf;
V9fsFidState *fidp;
int32_t fid, err = 0;
V9fsPDU *pdu = opaque;
v9fs_string_init(&flock.client_id);
err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type,
&flock.flags, &flock.start, &flock.length,
&flock.proc_id, &flock.client_id);
if (err < 0) {
goto out_nofid;
}
trace_v9fs_lock(pdu->tag, pdu->id, fid,
flock.type, flock.start, flock.length);
/* 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, &stbuf);
if (err < 0) {
goto out;
}
err = pdu_marshal(pdu, offset, "b", P9_LOCK_SUCCESS);
if (err < 0) {
goto out;
}
err += offset;
trace_v9fs_lock_return(pdu->tag, pdu->id, P9_LOCK_SUCCESS);
out:
put_fid(pdu, fidp);
out_nofid:
pdu_complete(pdu, err);
v9fs_string_free(&flock.client_id);
}
/*
* When a TGETLOCK request comes, always return success because all lock
* handling is done by client's VFS layer.
*/
static void coroutine_fn v9fs_getlock(void *opaque)
{
size_t offset = 7;
struct stat stbuf;
V9fsFidState *fidp;
V9fsGetlock glock;
int32_t fid, err = 0;
V9fsPDU *pdu = opaque;
v9fs_string_init(&glock.client_id);
err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type,
&glock.start, &glock.length, &glock.proc_id,
&glock.client_id);
if (err < 0) {
goto out_nofid;
}
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, &stbuf);
if (err < 0) {
goto out;
}
glock.type = P9_LOCK_TYPE_UNLCK;
err = pdu_marshal(pdu, offset, "bqqds", glock.type,
glock.start, glock.length, glock.proc_id,
&glock.client_id);
if (err < 0) {
goto out;
}
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:
pdu_complete(pdu, err);
v9fs_string_free(&glock.client_id);
}
static void coroutine_fn 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;
v9fs_string_init(&name);
err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid);
if (err < 0) {
goto out_nofid;
}
trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid);
if (name_is_illegal(name.data)) {
err = -ENOENT;
goto out_nofid;
}
if (!strcmp(".", name.data) || !strcmp("..", name.data)) {
err = -EEXIST;
goto out_nofid;
}
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;
}
err = stat_to_qid(pdu, &stbuf, &qid);
if (err < 0) {
goto out;
}
err = pdu_marshal(pdu, offset, "Q", &qid);
if (err < 0) {
goto out;
}
err += offset;
trace_v9fs_mkdir_return(pdu->tag, pdu->id,
qid.type, qid.version, qid.path, err);
out:
put_fid(pdu, fidp);
out_nofid:
pdu_complete(pdu, err);
v9fs_string_free(&name);
}
static void coroutine_fn 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;
v9fs_string_init(&name);
err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name);
if (err < 0) {
goto out_nofid;
}
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 (!v9fs_string_size(&name)) {
/*
* 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.xattrwalk_fid = true;
xattr_fidp->fs.xattr.value = g_malloc0(size);
if (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;
}
}
err = pdu_marshal(pdu, offset, "q", size);
if (err < 0) {
goto out;
}
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.xattrwalk_fid = true;
xattr_fidp->fs.xattr.value = g_malloc0(size);
if (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;
}
}
err = pdu_marshal(pdu, offset, "q", size);
if (err < 0) {
goto out;
}
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:
pdu_complete(pdu, err);
v9fs_string_free(&name);
}
static void coroutine_fn v9fs_xattrcreate(void *opaque)
{
int flags, rflags = 0;
int32_t fid;
uint64_t size;
ssize_t err = 0;
V9fsString name;
size_t offset = 7;
V9fsFidState *file_fidp;
V9fsFidState *xattr_fidp;
V9fsPDU *pdu = opaque;
v9fs_string_init(&name);
err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags);
if (err < 0) {
goto out_nofid;
}
trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags);
if (flags & ~(P9_XATTR_CREATE | P9_XATTR_REPLACE)) {
err = -EINVAL;
goto out_nofid;
}
if (flags & P9_XATTR_CREATE) {
rflags |= XATTR_CREATE;
}
if (flags & P9_XATTR_REPLACE) {
rflags |= XATTR_REPLACE;
}
if (size > XATTR_SIZE_MAX) {
err = -E2BIG;
goto out_nofid;
}
file_fidp = get_fid(pdu, fid);
if (file_fidp == NULL) {
err = -EINVAL;
goto out_nofid;
}
if (file_fidp->fid_type != P9_FID_NONE) {
err = -EINVAL;
goto out_put_fid;
}
/* 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.xattrwalk_fid = false;
xattr_fidp->fs.xattr.len = size;
xattr_fidp->fs.xattr.flags = rflags;
v9fs_string_init(&xattr_fidp->fs.xattr.name);
v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name);
xattr_fidp->fs.xattr.value = g_malloc0(size);
err = offset;
out_put_fid:
put_fid(pdu, file_fidp);
out_nofid:
pdu_complete(pdu, err);
v9fs_string_free(&name);
}
static void coroutine_fn v9fs_readlink(void *opaque)
{
V9fsPDU *pdu = opaque;
size_t offset = 7;
V9fsString target;
int32_t fid;
int err = 0;
V9fsFidState *fidp;
err = pdu_unmarshal(pdu, offset, "d", &fid);
if (err < 0) {
goto out_nofid;
}
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;
}
err = pdu_marshal(pdu, offset, "s", &target);
if (err < 0) {
v9fs_string_free(&target);
goto out;
}
err += offset;
trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data);
v9fs_string_free(&target);
out:
put_fid(pdu, fidp);
out_nofid:
pdu_complete(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 coroutine_fn v9fs_op_not_supp(void *opaque)
{
V9fsPDU *pdu = opaque;
pdu_complete(pdu, -EOPNOTSUPP);
}
static void coroutine_fn v9fs_fs_ro(void *opaque)
{
V9fsPDU *pdu = opaque;
pdu_complete(pdu, -EROFS);
}
static inline bool is_read_only_op(V9fsPDU *pdu)
{
switch (pdu->id) {
case P9_TREADDIR:
case P9_TSTATFS:
case P9_TGETATTR:
case P9_TXATTRWALK:
case P9_TLOCK:
case P9_TGETLOCK:
case P9_TREADLINK:
case P9_TVERSION:
case P9_TLOPEN:
case P9_TATTACH:
case P9_TSTAT:
case P9_TWALK:
case P9_TCLUNK:
case P9_TFSYNC:
case P9_TOPEN:
case P9_TREAD:
case P9_TAUTH:
case P9_TFLUSH:
return 1;
default:
return 0;
}
}
void pdu_submit(V9fsPDU *pdu, P9MsgHeader *hdr)
{
Coroutine *co;
CoroutineEntry *handler;
V9fsState *s = pdu->s;
pdu->size = le32_to_cpu(hdr->size_le);
pdu->id = hdr->id;
pdu->tag = le16_to_cpu(hdr->tag_le);
if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) ||
(pdu_co_handlers[pdu->id] == NULL)) {
handler = v9fs_op_not_supp;
} else if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) {
handler = v9fs_fs_ro;
} else {
handler = pdu_co_handlers[pdu->id];
}
qemu_co_queue_init(&pdu->complete);
co = qemu_coroutine_create(handler, pdu);
qemu_coroutine_enter(co);
}
/* Returns 0 on success, 1 on failure. */
int v9fs_device_realize_common(V9fsState *s, const V9fsTransport *t,
Error **errp)
{
ERRP_GUARD();
int i, len;
struct stat stat;
FsDriverEntry *fse;
V9fsPath path;
int rc = 1;
assert(!s->transport);
s->transport = t;
/* initialize pdu allocator */
QLIST_INIT(&s->free_list);
QLIST_INIT(&s->active_list);
for (i = 0; i < MAX_REQ; i++) {
QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next);
s->pdus[i].s = s;
s->pdus[i].idx = i;
}
v9fs_path_init(&path);
fse = get_fsdev_fsentry(s->fsconf.fsdev_id);
if (!fse) {
/* We don't have a fsdev identified by fsdev_id */
error_setg(errp, "9pfs device couldn't find fsdev with the "
"id = %s",
s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL");
goto out;
}
if (!s->fsconf.tag) {
/* we haven't specified a mount_tag */
error_setg(errp, "fsdev with id %s needs mount_tag arguments",
s->fsconf.fsdev_id);
goto out;
}
s->ctx.export_flags = fse->export_flags;
s->ctx.fs_root = g_strdup(fse->path);
s->ctx.exops.get_st_gen = NULL;
len = strlen(s->fsconf.tag);
if (len > MAX_TAG_LEN - 1) {
error_setg(errp, "mount tag '%s' (%d bytes) is longer than "
"maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1);
goto out;
}
s->tag = g_strdup(s->fsconf.tag);
s->ctx.uid = -1;
s->ops = fse->ops;
s->ctx.fmode = fse->fmode;
s->ctx.dmode = fse->dmode;
s->fid_list = NULL;
qemu_co_rwlock_init(&s->rename_lock);
if (s->ops->init(&s->ctx, errp) < 0) {
error_prepend(errp, "cannot initialize fsdev '%s': ",
s->fsconf.fsdev_id);
goto out;
}
/*
* Check details of export path, We need to use fs driver
* call back to do that. Since we are in the init path, we don't
* use co-routines here.
*/
if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) {
error_setg(errp,
"error in converting name to path %s", strerror(errno));
goto out;
}
if (s->ops->lstat(&s->ctx, &path, &stat)) {
error_setg(errp, "share path %s does not exist", fse->path);
goto out;
} else if (!S_ISDIR(stat.st_mode)) {
error_setg(errp, "share path %s is not a directory", fse->path);
goto out;
}
s->dev_id = stat.st_dev;
/* init inode remapping : */
/* hash table for variable length inode suffixes */
qpd_table_init(&s->qpd_table);
/* hash table for slow/full inode remapping (most users won't need it) */
qpf_table_init(&s->qpf_table);
/* hash table for quick inode remapping */
qpp_table_init(&s->qpp_table);
s->qp_ndevices = 0;
s->qp_affix_next = 1; /* reserve 0 to detect overflow */
s->qp_fullpath_next = 1;
s->ctx.fst = &fse->fst;
fsdev_throttle_init(s->ctx.fst);
rc = 0;
out:
if (rc) {
v9fs_device_unrealize_common(s);
}
v9fs_path_free(&path);
return rc;
}
void v9fs_device_unrealize_common(V9fsState *s)
{
if (s->ops && s->ops->cleanup) {
s->ops->cleanup(&s->ctx);
}
if (s->ctx.fst) {
fsdev_throttle_cleanup(s->ctx.fst);
}
g_free(s->tag);
qp_table_destroy(&s->qpd_table);
qp_table_destroy(&s->qpp_table);
qp_table_destroy(&s->qpf_table);
g_free(s->ctx.fs_root);
}
typedef struct VirtfsCoResetData {
V9fsPDU pdu;
bool done;
} VirtfsCoResetData;
static void coroutine_fn virtfs_co_reset(void *opaque)
{
VirtfsCoResetData *data = opaque;
virtfs_reset(&data->pdu);
data->done = true;
}
void v9fs_reset(V9fsState *s)
{
VirtfsCoResetData data = { .pdu = { .s = s }, .done = false };
Coroutine *co;
while (!QLIST_EMPTY(&s->active_list)) {
aio_poll(qemu_get_aio_context(), true);
}
co = qemu_coroutine_create(virtfs_co_reset, &data);
qemu_coroutine_enter(co);
while (!data.done) {
aio_poll(qemu_get_aio_context(), true);
}
}
static void __attribute__((__constructor__)) v9fs_set_fd_limit(void)
{
struct rlimit rlim;
if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) {
error_report("Failed to get the resource limit");
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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