Archipelago » qemu

/*

 * Virtio 9p backend

 *

 * Copyright IBM, Corp. 2011

 *

 * Authors:

 *  Aneesh Kumar K.V <aneesh.kumar@linux.vnet.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 "fsdev/qemu-fsdev.h"

#include "qemu-thread.h"

#include "block/coroutine.h"

#include "virtio-9p-coth.h"

int v9fs_co_readlink(V9fsPDU *pdu, V9fsPath *path, V9fsString *buf)

{

    int err;

    ssize_t len;

    V9fsState *s = pdu->s;

    if (v9fs_request_cancelled(pdu)) {

        return -EINTR;

    }

    buf->data = g_malloc(PATH_MAX);

    v9fs_path_read_lock(s);

    v9fs_co_run_in_worker(

        {

            len = s->ops->readlink(&s->ctx, path,

                                   buf->data, PATH_MAX - 1);

            if (len > -1) {

                buf->size = len;

                buf->data[len] = 0;

                err = 0;

            } else {

                err = -errno;

            }

        });

    v9fs_path_unlock(s);

    if (err) {

        g_free(buf->data);

        buf->data = NULL;

        buf->size = 0;

    }

    return err;

}

int v9fs_co_statfs(V9fsPDU *pdu, V9fsPath *path, struct statfs *stbuf)

{

    int err;

    V9fsState *s = pdu->s;

    if (v9fs_request_cancelled(pdu)) {

        return -EINTR;

    }

    v9fs_path_read_lock(s);

    v9fs_co_run_in_worker(

        {

            err = s->ops->statfs(&s->ctx, path, stbuf);

            if (err < 0) {

                err = -errno;

            }

        });

    v9fs_path_unlock(s);

    return err;

}

int v9fs_co_chmod(V9fsPDU *pdu, V9fsPath *path, mode_t mode)

{

    int err;

    FsCred cred;

    V9fsState *s = pdu->s;

    if (v9fs_request_cancelled(pdu)) {

        return -EINTR;

    }

    cred_init(&cred);

    cred.fc_mode = mode;

    v9fs_path_read_lock(s);

    v9fs_co_run_in_worker(

        {

            err = s->ops->chmod(&s->ctx, path, &cred);

            if (err < 0) {

                err = -errno;

            }

        });

    v9fs_path_unlock(s);

    return err;

}

int v9fs_co_utimensat(V9fsPDU *pdu, V9fsPath *path,

                      struct timespec times[2])

{

    int err;

    V9fsState *s = pdu->s;

    if (v9fs_request_cancelled(pdu)) {

        return -EINTR;

    }

    v9fs_path_read_lock(s);

    v9fs_co_run_in_worker(

        {

            err = s->ops->utimensat(&s->ctx, path, times);

            if (err < 0) {

                err = -errno;

            }

        });

    v9fs_path_unlock(s);

    return err;

}

int v9fs_co_chown(V9fsPDU *pdu, V9fsPath *path, uid_t uid, gid_t gid)

{

    int err;

    FsCred cred;

    V9fsState *s = pdu->s;

    if (v9fs_request_cancelled(pdu)) {

        return -EINTR;

    }

    cred_init(&cred);

    cred.fc_uid = uid;

    cred.fc_gid = gid;

    v9fs_path_read_lock(s);

    v9fs_co_run_in_worker(

        {

            err = s->ops->chown(&s->ctx, path, &cred);

            if (err < 0) {

                err = -errno;

            }

        });

    v9fs_path_unlock(s);

    return err;

}

int v9fs_co_truncate(V9fsPDU *pdu, V9fsPath *path, off_t size)

{

    int err;

    V9fsState *s = pdu->s;

    if (v9fs_request_cancelled(pdu)) {

        return -EINTR;

    }

    v9fs_path_read_lock(s);

    v9fs_co_run_in_worker(

        {

            err = s->ops->truncate(&s->ctx, path, size);

            if (err < 0) {

                err = -errno;

            }

        });

    v9fs_path_unlock(s);

    return err;

}

int v9fs_co_mknod(V9fsPDU *pdu, V9fsFidState *fidp, V9fsString *name, uid_t uid,

                  gid_t gid, dev_t dev, mode_t mode, struct stat *stbuf)

{

    int err;

    V9fsPath path;

    FsCred cred;

    V9fsState *s = pdu->s;

    if (v9fs_request_cancelled(pdu)) {

        return -EINTR;

    }

    cred_init(&cred);

    cred.fc_uid  = uid;

    cred.fc_gid  = gid;

    cred.fc_mode = mode;

    cred.fc_rdev = dev;

    v9fs_path_read_lock(s);

    v9fs_co_run_in_worker(

        {

            err = s->ops->mknod(&s->ctx, &fidp->path, name->data, &cred);

            if (err < 0) {

                err = -errno;

            } else {

                v9fs_path_init(&path);

                err = v9fs_name_to_path(s, &fidp->path, name->data, &path);

                if (!err) {

                    err = s->ops->lstat(&s->ctx, &path, stbuf);

                    if (err < 0) {

                        err = -errno;

                    }

                }

                v9fs_path_free(&path);

            }

        });

    v9fs_path_unlock(s);

    return err;

}

/* Only works with path name based fid */

int v9fs_co_remove(V9fsPDU *pdu, V9fsPath *path)

{

    int err;

    V9fsState *s = pdu->s;

    if (v9fs_request_cancelled(pdu)) {

        return -EINTR;

    }

    v9fs_path_read_lock(s);

    v9fs_co_run_in_worker(

        {

            err = s->ops->remove(&s->ctx, path->data);

            if (err < 0) {

                err = -errno;

            }

        });

    v9fs_path_unlock(s);

    return err;

}

int v9fs_co_unlinkat(V9fsPDU *pdu, V9fsPath *path, V9fsString *name, int flags)

{

    int err;

    V9fsState *s = pdu->s;

    if (v9fs_request_cancelled(pdu)) {

        return -EINTR;

    }

    v9fs_path_read_lock(s);

    v9fs_co_run_in_worker(

        {

            err = s->ops->unlinkat(&s->ctx, path, name->data, flags);

            if (err < 0) {

                err = -errno;

            }

        });

    v9fs_path_unlock(s);

    return err;

}

/* Only work with path name based fid */

int v9fs_co_rename(V9fsPDU *pdu, V9fsPath *oldpath, V9fsPath *newpath)

{

    int err;

    V9fsState *s = pdu->s;

    if (v9fs_request_cancelled(pdu)) {

        return -EINTR;

    }

    v9fs_co_run_in_worker(

        {

            err = s->ops->rename(&s->ctx, oldpath->data, newpath->data);

            if (err < 0) {

                err = -errno;

            }

        });

    return err;

}

int v9fs_co_renameat(V9fsPDU *pdu, V9fsPath *olddirpath, V9fsString *oldname,

                     V9fsPath *newdirpath, V9fsString *newname)

{

    int err;

    V9fsState *s = pdu->s;

    if (v9fs_request_cancelled(pdu)) {

        return -EINTR;

    }

    v9fs_co_run_in_worker(

        {

            err = s->ops->renameat(&s->ctx, olddirpath, oldname->data,

                                   newdirpath, newname->data);

            if (err < 0) {

                err = -errno;

            }

        });

    return err;

}

int v9fs_co_symlink(V9fsPDU *pdu, V9fsFidState *dfidp, V9fsString *name,

                    const char *oldpath, gid_t gid, struct stat *stbuf)

{

    int err;

    FsCred cred;

    V9fsPath path;

    V9fsState *s = pdu->s;

    if (v9fs_request_cancelled(pdu)) {

        return -EINTR;

    }

    cred_init(&cred);

    cred.fc_uid = dfidp->uid;

    cred.fc_gid = gid;

    cred.fc_mode = 0777;

    v9fs_path_read_lock(s);

    v9fs_co_run_in_worker(

        {

            err = s->ops->symlink(&s->ctx, oldpath, &dfidp->path,

                                  name->data, &cred);

            if (err < 0) {

                err = -errno;

            } else {

                v9fs_path_init(&path);

                err = v9fs_name_to_path(s, &dfidp->path, name->data, &path);

                if (!err) {

                    err = s->ops->lstat(&s->ctx, &path, stbuf);

                    if (err < 0) {

                        err = -errno;

                    }

                }

                v9fs_path_free(&path);

            }

        });

    v9fs_path_unlock(s);

    return err;

}

/*

 * For path name based fid we don't block. So we can

 * directly call the fs driver ops.

 */

int v9fs_co_name_to_path(V9fsPDU *pdu, V9fsPath *dirpath,

                         const char *name, V9fsPath *path)

{

    int err;

    V9fsState *s = pdu->s;

    if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {

        err = s->ops->name_to_path(&s->ctx, dirpath, name, path);

        if (err < 0) {

            err = -errno;

        }

    } else {

        if (v9fs_request_cancelled(pdu)) {

            return -EINTR;

        }

        v9fs_co_run_in_worker(

            {

                err = s->ops->name_to_path(&s->ctx, dirpath, name, path);

                if (err < 0) {

                    err = -errno;

                }

            });

    }

    return err;

}