diff options
Diffstat (limited to 'qemu/hw/9pfs/cofs.c')
| -rw-r--r-- | qemu/hw/9pfs/cofs.c | 364 |
1 files changed, 364 insertions, 0 deletions
diff --git a/qemu/hw/9pfs/cofs.c b/qemu/hw/9pfs/cofs.c new file mode 100644 index 000000000..42ee614e2 --- /dev/null +++ b/qemu/hw/9pfs/cofs.c @@ -0,0 +1,364 @@ + +/* + * 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" + +static ssize_t __readlink(V9fsState *s, V9fsPath *path, V9fsString *buf) +{ + ssize_t len, maxlen = PATH_MAX; + + buf->data = g_malloc(PATH_MAX); + for(;;) { + len = s->ops->readlink(&s->ctx, path, buf->data, maxlen); + if (len < 0) { + g_free(buf->data); + buf->data = NULL; + buf->size = 0; + break; + } else if (len == maxlen) { + /* + * We dodn't have space to put the NULL or we have more + * to read. Increase the size and try again + */ + maxlen *= 2; + g_free(buf->data); + buf->data = g_malloc(maxlen); + continue; + } + /* + * Null terminate the readlink output + */ + buf->data[len] = '\0'; + buf->size = len; + break; + } + return len; +} + +int v9fs_co_readlink(V9fsPDU *pdu, V9fsPath *path, V9fsString *buf) +{ + int err; + V9fsState *s = pdu->s; + + if (v9fs_request_cancelled(pdu)) { + return -EINTR; + } + v9fs_path_read_lock(s); + v9fs_co_run_in_worker( + { + err = __readlink(s, path, buf); + if (err < 0) { + err = -errno; + } + }); + v9fs_path_unlock(s); + 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; +} |