root / hw / 9pfs / cofile.c @ 2c30dd74
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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 "qemu-coroutine.h" |
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#include "virtio-9p-coth.h" |
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int v9fs_co_st_gen(V9fsPDU *pdu, V9fsPath *path, mode_t st_mode,
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V9fsStatDotl *v9stat) |
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{
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int err = 0; |
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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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if (s->ctx.exops.get_st_gen) {
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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->ctx.exops.get_st_gen(&s->ctx, path, st_mode, |
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&v9stat->st_gen); |
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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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} |
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return err;
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} |
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int v9fs_co_lstat(V9fsPDU *pdu, V9fsPath *path, struct stat *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->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_unlock(s); |
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return err;
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} |
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int v9fs_co_fstat(V9fsPDU *pdu, V9fsFidState *fidp, struct stat *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_co_run_in_worker( |
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{
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err = s->ops->fstat(&s->ctx, fidp->fid_type, &fidp->fs, 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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/*
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* Some FS driver (local:mapped-file) can't support fetching attributes
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* using file descriptor. Use Path name in that case.
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*/
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if (err == -EOPNOTSUPP) {
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err = v9fs_co_lstat(pdu, &fidp->path, stbuf); |
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if (err == -ENOENT) {
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/*
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* fstat on an unlinked file. Work with partial results
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* returned from s->ops->fstat
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*/
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err = 0;
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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_open(V9fsPDU *pdu, V9fsFidState *fidp, 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->open(&s->ctx, &fidp->path, flags, &fidp->fs); |
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if (err == -1) { |
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err = -errno; |
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} else {
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err = 0;
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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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total_open_fd++; |
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if (total_open_fd > open_fd_hw) {
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v9fs_reclaim_fd(pdu); |
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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_open2(V9fsPDU *pdu, V9fsFidState *fidp, V9fsString *name, gid_t gid,
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int flags, int mode, 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_mode = mode & 07777;
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cred.fc_uid = fidp->uid; |
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cred.fc_gid = gid; |
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/*
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* Hold the directory fid lock so that directory path name
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* don't change. Read lock is fine because this fid cannot
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* be used by any other operation.
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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->open2(&s->ctx, &fidp->path, |
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name->data, flags, &cred, &fidp->fs); |
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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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s->ops->close(&s->ctx, &fidp->fs); |
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} else {
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v9fs_path_copy(&fidp->path, &path); |
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} |
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} else {
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s->ops->close(&s->ctx, &fidp->fs); |
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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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if (!err) {
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total_open_fd++; |
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if (total_open_fd > open_fd_hw) {
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v9fs_reclaim_fd(pdu); |
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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_close(V9fsPDU *pdu, V9fsFidOpenState *fs)
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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->close(&s->ctx, fs); |
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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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if (!err) {
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total_open_fd--; |
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} |
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return err;
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} |
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int v9fs_co_fsync(V9fsPDU *pdu, V9fsFidState *fidp, int datasync) |
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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->fsync(&s->ctx, fidp->fid_type, &fidp->fs, datasync); |
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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_link(V9fsPDU *pdu, V9fsFidState *oldfid,
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V9fsFidState *newdirfid, V9fsString *name) |
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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->link(&s->ctx, &oldfid->path, |
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&newdirfid->path, name->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_pwritev(V9fsPDU *pdu, V9fsFidState *fidp,
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struct iovec *iov, int iovcnt, int64_t offset) |
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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->pwritev(&s->ctx, &fidp->fs, iov, iovcnt, offset); |
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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_preadv(V9fsPDU *pdu, V9fsFidState *fidp,
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struct iovec *iov, int iovcnt, int64_t offset) |
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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->preadv(&s->ctx, &fidp->fs, iov, iovcnt, offset); |
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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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} |