root / hw / 9pfs / cofs.c @ a8aec295
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/*
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* Virtio 9p backend
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*
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* Copyright IBM, Corp. 2011
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*
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* Authors:
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* Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "fsdev/qemu-fsdev.h" |
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#include "qemu/thread.h" |
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#include "block/coroutine.h" |
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#include "virtio-9p-coth.h" |
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int v9fs_co_readlink(V9fsPDU *pdu, V9fsPath *path, V9fsString *buf)
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{
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int err;
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ssize_t len; |
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V9fsState *s = pdu->s; |
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if (v9fs_request_cancelled(pdu)) {
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return -EINTR;
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} |
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buf->data = g_malloc(PATH_MAX); |
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v9fs_path_read_lock(s); |
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v9fs_co_run_in_worker( |
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{
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len = s->ops->readlink(&s->ctx, path, |
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buf->data, PATH_MAX - 1);
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if (len > -1) { |
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buf->size = len; |
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buf->data[len] = 0;
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err = 0;
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} else {
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err = -errno; |
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} |
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}); |
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v9fs_path_unlock(s); |
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if (err) {
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g_free(buf->data); |
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buf->data = NULL;
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buf->size = 0;
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} |
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return err;
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} |
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int v9fs_co_statfs(V9fsPDU *pdu, V9fsPath *path, struct statfs *stbuf) |
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{
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int err;
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V9fsState *s = pdu->s; |
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if (v9fs_request_cancelled(pdu)) {
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return -EINTR;
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} |
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v9fs_path_read_lock(s); |
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v9fs_co_run_in_worker( |
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{
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err = s->ops->statfs(&s->ctx, path, stbuf); |
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if (err < 0) { |
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err = -errno; |
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} |
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}); |
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v9fs_path_unlock(s); |
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return err;
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} |
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int v9fs_co_chmod(V9fsPDU *pdu, V9fsPath *path, mode_t mode)
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{
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int err;
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FsCred cred; |
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V9fsState *s = pdu->s; |
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if (v9fs_request_cancelled(pdu)) {
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return -EINTR;
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} |
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cred_init(&cred); |
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cred.fc_mode = mode; |
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v9fs_path_read_lock(s); |
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v9fs_co_run_in_worker( |
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{
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err = s->ops->chmod(&s->ctx, path, &cred); |
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if (err < 0) { |
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err = -errno; |
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} |
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}); |
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v9fs_path_unlock(s); |
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return err;
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} |
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int v9fs_co_utimensat(V9fsPDU *pdu, V9fsPath *path,
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struct timespec times[2]) |
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{
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int err;
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V9fsState *s = pdu->s; |
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if (v9fs_request_cancelled(pdu)) {
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return -EINTR;
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} |
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v9fs_path_read_lock(s); |
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v9fs_co_run_in_worker( |
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{
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err = s->ops->utimensat(&s->ctx, path, times); |
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if (err < 0) { |
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err = -errno; |
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} |
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}); |
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v9fs_path_unlock(s); |
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return err;
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} |
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int v9fs_co_chown(V9fsPDU *pdu, V9fsPath *path, uid_t uid, gid_t gid)
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{
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int err;
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FsCred cred; |
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V9fsState *s = pdu->s; |
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if (v9fs_request_cancelled(pdu)) {
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return -EINTR;
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} |
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cred_init(&cred); |
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cred.fc_uid = uid; |
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cred.fc_gid = gid; |
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v9fs_path_read_lock(s); |
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v9fs_co_run_in_worker( |
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{
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err = s->ops->chown(&s->ctx, path, &cred); |
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if (err < 0) { |
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err = -errno; |
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} |
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}); |
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v9fs_path_unlock(s); |
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return err;
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} |
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int v9fs_co_truncate(V9fsPDU *pdu, V9fsPath *path, off_t size)
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{
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int err;
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V9fsState *s = pdu->s; |
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if (v9fs_request_cancelled(pdu)) {
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return -EINTR;
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} |
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v9fs_path_read_lock(s); |
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v9fs_co_run_in_worker( |
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{
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err = s->ops->truncate(&s->ctx, path, size); |
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if (err < 0) { |
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err = -errno; |
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} |
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}); |
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v9fs_path_unlock(s); |
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return err;
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} |
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int v9fs_co_mknod(V9fsPDU *pdu, V9fsFidState *fidp, V9fsString *name, uid_t uid,
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gid_t gid, dev_t dev, mode_t mode, struct stat *stbuf)
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{
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int err;
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V9fsPath path; |
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FsCred cred; |
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V9fsState *s = pdu->s; |
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if (v9fs_request_cancelled(pdu)) {
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return -EINTR;
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} |
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cred_init(&cred); |
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cred.fc_uid = uid; |
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cred.fc_gid = gid; |
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cred.fc_mode = mode; |
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cred.fc_rdev = dev; |
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v9fs_path_read_lock(s); |
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v9fs_co_run_in_worker( |
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{
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err = s->ops->mknod(&s->ctx, &fidp->path, name->data, &cred); |
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if (err < 0) { |
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err = -errno; |
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} else {
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v9fs_path_init(&path); |
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err = v9fs_name_to_path(s, &fidp->path, name->data, &path); |
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if (!err) {
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err = s->ops->lstat(&s->ctx, &path, stbuf); |
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if (err < 0) { |
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err = -errno; |
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} |
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} |
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v9fs_path_free(&path); |
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} |
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}); |
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v9fs_path_unlock(s); |
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return err;
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} |
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/* Only works with path name based fid */
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int v9fs_co_remove(V9fsPDU *pdu, V9fsPath *path)
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{
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int err;
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V9fsState *s = pdu->s; |
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if (v9fs_request_cancelled(pdu)) {
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return -EINTR;
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} |
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v9fs_path_read_lock(s); |
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v9fs_co_run_in_worker( |
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{
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err = s->ops->remove(&s->ctx, path->data); |
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if (err < 0) { |
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err = -errno; |
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} |
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}); |
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v9fs_path_unlock(s); |
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return err;
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} |
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int v9fs_co_unlinkat(V9fsPDU *pdu, V9fsPath *path, V9fsString *name, int flags) |
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{
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int err;
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V9fsState *s = pdu->s; |
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if (v9fs_request_cancelled(pdu)) {
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return -EINTR;
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} |
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v9fs_path_read_lock(s); |
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v9fs_co_run_in_worker( |
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{
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err = s->ops->unlinkat(&s->ctx, path, name->data, flags); |
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if (err < 0) { |
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err = -errno; |
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} |
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}); |
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v9fs_path_unlock(s); |
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return err;
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} |
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/* Only work with path name based fid */
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int v9fs_co_rename(V9fsPDU *pdu, V9fsPath *oldpath, V9fsPath *newpath)
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{
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int err;
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V9fsState *s = pdu->s; |
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if (v9fs_request_cancelled(pdu)) {
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return -EINTR;
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} |
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v9fs_co_run_in_worker( |
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{
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err = s->ops->rename(&s->ctx, oldpath->data, newpath->data); |
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if (err < 0) { |
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err = -errno; |
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} |
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}); |
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return err;
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} |
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int v9fs_co_renameat(V9fsPDU *pdu, V9fsPath *olddirpath, V9fsString *oldname,
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V9fsPath *newdirpath, V9fsString *newname) |
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{
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int err;
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V9fsState *s = pdu->s; |
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if (v9fs_request_cancelled(pdu)) {
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return -EINTR;
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} |
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v9fs_co_run_in_worker( |
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{
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err = s->ops->renameat(&s->ctx, olddirpath, oldname->data, |
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newdirpath, newname->data); |
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if (err < 0) { |
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err = -errno; |
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} |
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}); |
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return err;
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} |
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int v9fs_co_symlink(V9fsPDU *pdu, V9fsFidState *dfidp, V9fsString *name,
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const char *oldpath, gid_t gid, struct stat *stbuf) |
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{
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int err;
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FsCred cred; |
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V9fsPath path; |
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V9fsState *s = pdu->s; |
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if (v9fs_request_cancelled(pdu)) {
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return -EINTR;
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} |
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cred_init(&cred); |
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cred.fc_uid = dfidp->uid; |
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cred.fc_gid = gid; |
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cred.fc_mode = 0777;
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v9fs_path_read_lock(s); |
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v9fs_co_run_in_worker( |
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{
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err = s->ops->symlink(&s->ctx, oldpath, &dfidp->path, |
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name->data, &cred); |
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if (err < 0) { |
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err = -errno; |
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} else {
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v9fs_path_init(&path); |
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err = v9fs_name_to_path(s, &dfidp->path, name->data, &path); |
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if (!err) {
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err = s->ops->lstat(&s->ctx, &path, stbuf); |
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if (err < 0) { |
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err = -errno; |
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} |
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} |
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v9fs_path_free(&path); |
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} |
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}); |
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v9fs_path_unlock(s); |
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return err;
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} |
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/*
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* For path name based fid we don't block. So we can
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* directly call the fs driver ops.
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*/
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int v9fs_co_name_to_path(V9fsPDU *pdu, V9fsPath *dirpath,
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const char *name, V9fsPath *path) |
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{
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int err;
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V9fsState *s = pdu->s; |
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if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
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err = s->ops->name_to_path(&s->ctx, dirpath, name, path); |
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if (err < 0) { |
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err = -errno; |
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} |
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} else {
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if (v9fs_request_cancelled(pdu)) {
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return -EINTR;
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} |
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v9fs_co_run_in_worker( |
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{
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err = s->ops->name_to_path(&s->ctx, dirpath, name, path); |
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if (err < 0) { |
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err = -errno; |
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} |
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}); |
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} |
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return err;
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} |