diff options
Diffstat (limited to 'hw/9pfs/9p.c')
| -rw-r--r-- | hw/9pfs/9p.c | 3278 |
1 files changed, 3278 insertions, 0 deletions
diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c new file mode 100644 index 0000000000..379fdcb2fe --- /dev/null +++ b/hw/9pfs/9p.c @@ -0,0 +1,3278 @@ +/* + * 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 "hw/virtio/virtio.h" +#include "hw/i386/pc.h" +#include "qemu/error-report.h" +#include "qemu/iov.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/migration.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, +}; + +ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) +{ + ssize_t ret; + va_list ap; + + va_start(ap, fmt); + ret = virtio_pdu_vmarshal(pdu, offset, fmt, ap); + va_end(ap); + + return ret; +} + +ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) +{ + ssize_t ret; + va_list ap; + + va_start(ap, fmt); + ret = virtio_pdu_vunmarshal(pdu, offset, fmt, ap); + va_end(ap); + + return ret; +} + +static void pdu_push_and_notify(V9fsPDU *pdu) +{ + virtio_9p_push_and_notify(pdu); +} + +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; +} + +struct dotl_openflag_map { + int dotl_flag; + int open_flag; +}; + +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; + + struct dotl_openflag_map 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 v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs) +{ + v9fs_path_free(lhs); + lhs->data = g_malloc(rhs->size); + memcpy(lhs->data, rhs->data, rhs->size); + lhs->size = rhs->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 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 == NULL) { + do { + err = v9fs_co_opendir(pdu, f); + } while (err == -EINTR && !pdu->cancelled); + } + } + return err; +} + +static V9fsFidState *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; + + return f; +} + +static int v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp) +{ + int retval = 0; + + if (fidp->fs.xattr.copied_len == -1) { + /* 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 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 != 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 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 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 != 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 = f->fs.dir; + f->fs.dir = 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 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 -1; + } + /* + * 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 virtfs_reset(V9fsPDU *pdu) +{ + V9fsState *s = pdu->s; + V9fsFidState *fidp = NULL; + + /* Free all fids */ + while (s->fid_list) { + fidp = s->fid_list; + s->fid_list = fidp->next; + + if (fidp->ref) { + fidp->clunked = 1; + } else { + free_fid(pdu, fidp); + } + } + if (fidp) { + /* One or more unclunked fids found... */ + error_report("9pfs:%s: One or more uncluncked fids " + "found during reset", __func__); + } +} + +#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) + +/* This is the algorithm from ufs in spfs */ +static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp) +{ + size_t size; + + 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; + } +} + +static int 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; + } + stat_to_qid(&stbuf, qidp); + return 0; +} + +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) +{ + if (pdu) { + V9fsState *s = pdu->s; + /* + * Cancelled pdu are added back to the freelist + * by flush request . + */ + if (!pdu->cancelled) { + QLIST_REMOVE(pdu, next); + QLIST_INSERT_HEAD(&s->free_list, pdu, next); + } + } +} + +/* + * We don't do error checking for pdu_marshal/unmarshal here + * because we always expect to have enough space to encode + * error details + */ +static void pdu_complete(V9fsPDU *pdu, ssize_t len) +{ + int8_t id = pdu->id + 1; /* Response */ + V9fsState *s = pdu->s; + + 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); + + len += pdu_marshal(pdu, len, "s", &str); + id = P9_RERROR; + } + + len += pdu_marshal(pdu, len, "d", err); + + if (s->proto_version == V9FS_PROTO_2000L) { + id = P9_RLERROR; + } + trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */ + } + + /* fill out the header */ + pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag); + + /* keep these in sync */ + pdu->size = len; + pdu->id = id; + + pdu_push_and_notify(pdu); + + /* Now wakeup anybody waiting in flush for this request */ + 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 == -1 && + stat->qid.version == -1 && + stat->qid.path == -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 stat_to_v9stat(V9fsPDU *pdu, V9fsPath *name, + const struct stat *stbuf, + V9fsStat *v9stat) +{ + int err; + const char *str; + + memset(v9stat, 0, sizeof(*v9stat)); + + stat_to_qid(stbuf, &v9stat->qid); + v9stat->mode = stat_to_v9mode(stbuf); + v9stat->atime = stbuf->st_atime; + v9stat->mtime = stbuf->st_mtime; + v9stat->length = stbuf->st_size; + + v9fs_string_null(&v9stat->uid); + v9fs_string_null(&v9stat->gid); + v9fs_string_null(&v9stat->muid); + + v9stat->n_uid = stbuf->st_uid; + v9stat->n_gid = stbuf->st_gid; + v9stat->n_muid = 0; + + v9fs_string_null(&v9stat->extension); + + if (v9stat->mode & P9_STAT_MODE_SYMLINK) { + err = v9fs_co_readlink(pdu, name, &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); + } + + str = strrchr(name->data, '/'); + if (str) { + str += 1; + } else { + str = name->data; + } + + v9fs_string_sprintf(&v9stat->name, "%s", str); + + 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 void stat_to_v9stat_dotl(V9fsState *s, 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; + + stat_to_qid(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_string_sprintf((V9fsString *)dst, "%s%s", src->data, str.data+len); + v9fs_path_free(&str); + /* +1 to include terminating NULL */ + dst->size++; +} + +static inline bool is_ro_export(FsContext *ctx) +{ + return ctx->export_flags & V9FS_RDONLY; +} + +static void 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) { + offset = err; + 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"); + } + + err = pdu_marshal(pdu, offset, "ds", s->msize, &version); + if (err < 0) { + offset = err; + goto out; + } + offset += err; + trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data); +out: + pdu_complete(pdu, offset); + v9fs_string_free(&version); +} + +static void 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; + } + err = pdu_marshal(pdu, offset, "Q", &qid); + if (err < 0) { + clunk_fid(s, fid); + goto out; + } + err += offset; + trace_v9fs_attach_return(pdu->tag, pdu->id, + qid.type, qid.version, qid.path); + /* + * disable migration if we haven't done already. + * attach could get called multiple times for the same export. + */ + if (!s->migration_blocker) { + s->root_fid = fid; + 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); + migrate_add_blocker(s->migration_blocker); + } +out: + put_fid(pdu, fidp); +out_nofid: + pdu_complete(pdu, err); + v9fs_string_free(&uname); + v9fs_string_free(&aname); +} + +static void 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; + + 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; + } + err = stat_to_v9stat(pdu, &fidp->path, &stbuf, &v9stat); + 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 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; + V9fsState *s = pdu->s; + + 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; + } + stat_to_v9stat_dotl(s, &stbuf, &v9stat_dotl); + + /* 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 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; + } + + 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; +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 void 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; + + 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_malloc0(sizeof(wnames[0]) * nwnames); + qids = g_malloc0(sizeof(qids[0]) * nwnames); + for (i = 0; i < nwnames; i++) { + err = pdu_unmarshal(pdu, offset, "s", &wnames[i]); + if (err < 0) { + 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); + /* + * 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++) { + 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; + } + stat_to_qid(&stbuf, &qids[name_idx]); + v9fs_path_copy(&dpath, &path); + } + if (fid == newfid) { + BUG_ON(fidp->fid_type != P9_FID_NONE); + v9fs_path_copy(&fidp->path, &path); + } 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 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)) { + iounit = stbuf.f_bsize; + iounit *= (s->msize - P9_IOHDRSZ)/stbuf.f_bsize; + } + if (!iounit) { + iounit = s->msize - P9_IOHDRSZ; + } + return iounit; +} + +static void 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; + } + BUG_ON(fidp->fid_type != P9_FID_NONE); + + err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); + if (err < 0) { + goto out; + } + stat_to_qid(&stbuf, &qid); + 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 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); + + fidp = get_fid(pdu, dfid); + if (fidp == NULL) { + err = -ENOENT; + goto out_nofid; + } + + 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); + stat_to_qid(&stbuf, &qid); + 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 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 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); +} + +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; + int read_count; + int64_t xattr_len; + + xattr_len = fidp->fs.xattr.len; + read_count = xattr_len - off; + if (read_count > max_count) { + read_count = max_count; + } else if (read_count < 0) { + /* + * read beyond XATTR value + */ + read_count = 0; + } + err = pdu_marshal(pdu, offset, "d", read_count); + if (err < 0) { + return err; + } + offset += err; + err = v9fs_pack(pdu->elem.in_sg, pdu->elem.in_num, offset, + ((char *)fidp->fs.xattr.value) + off, + read_count); + if (err < 0) { + return err; + } + offset += err; + return offset; +} + +static int 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, *result; + + /* save the directory position */ + saved_dir_pos = v9fs_co_telldir(pdu, fidp); + if (saved_dir_pos < 0) { + return saved_dir_pos; + } + + dent = g_malloc(sizeof(struct dirent)); + + while (1) { + v9fs_path_init(&path); + err = v9fs_co_readdir_r(pdu, fidp, dent, &result); + if (err || !result) { + break; + } + 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_v9stat(pdu, &path, &stbuf, &v9stat); + if (err < 0) { + goto out; + } + /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ + len = pdu_marshal(pdu, 11 + count, "S", &v9stat); + if ((len != (v9stat.size + 2)) || ((count + len) > max_count)) { + /* 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); + g_free(dent); + return count; + } + count += len; + v9fs_stat_free(&v9stat); + v9fs_path_free(&path); + saved_dir_pos = dent->d_off; + } +out: + g_free(dent); + v9fs_path_free(&path); + if (err < 0) { + return err; + } + return count; +} + +/* + * 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; + + virtio_init_iov_from_pdu(pdu, &iov, &niov, is_write); + + qemu_iovec_init_external(&elem, iov, niov); + qemu_iovec_init(qiov, niov); + qemu_iovec_concat(qiov, &elem, skip, size); +} + +static void 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; + } + } while (count < max_count && len > 0); + err = pdu_marshal(pdu, offset, "d", count); + if (err < 0) { + goto out; + } + err += offset + count; + 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); +} + +static size_t v9fs_readdir_data_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 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, *result; + + /* save the directory position */ + saved_dir_pos = v9fs_co_telldir(pdu, fidp); + if (saved_dir_pos < 0) { + return saved_dir_pos; + } + + dent = g_malloc(sizeof(struct dirent)); + + while (1) { + err = v9fs_co_readdir_r(pdu, fidp, dent, &result); + if (err || !result) { + break; + } + v9fs_string_init(&name); + v9fs_string_sprintf(&name, "%s", dent->d_name); + if ((count + v9fs_readdir_data_size(&name)) > max_count) { + /* Ran out of buffer. Set dir back to old position and return */ + v9fs_co_seekdir(pdu, fidp, saved_dir_pos); + v9fs_string_free(&name); + g_free(dent); + return count; + } + /* + * 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 + */ + 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); + if (len < 0) { + v9fs_co_seekdir(pdu, fidp, saved_dir_pos); + v9fs_string_free(&name); + g_free(dent); + return len; + } + count += len; + v9fs_string_free(&name); + saved_dir_pos = dent->d_off; + } + g_free(dent); + if (err < 0) { + return err; + } + return count; +} + +static void 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; + + 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); + + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + retval = -EINVAL; + goto out_nofid; + } + if (!fidp->fs.dir) { + 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; + int write_count; + int64_t xattr_len; + size_t offset = 7; + + + xattr_len = fidp->fs.xattr.len; + write_count = xattr_len - off; + if (write_count > count) { + write_count = count; + } else if (write_count < 0) { + /* + * write beyond XATTR value len specified in + * xattrcreate + */ + err = -ENOSPC; + goto out; + } + 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; + } +out: + return err; +} + +static void 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; + } + 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 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; + + 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); + + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + err = -EINVAL; + goto out_nofid; + } + 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_copy(&fidp->path, &path); + 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_copy(&fidp->path, &path); + } 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_copy(&fidp->path, &path); + 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_copy(&fidp->path, &path); + } 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_copy(&fidp->path, &path); + } 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_copy(&fidp->path, &path); + } 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); + stat_to_qid(&stbuf, &qid); + 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 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); + + 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; + } + stat_to_qid(&stbuf, &qid); + 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 v9fs_flush(void *opaque) +{ + ssize_t err; + int16_t tag; + size_t offset = 7; + V9fsPDU *cancel_pdu; + 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); + + 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); + cancel_pdu->cancelled = 0; + pdu_free(cancel_pdu); + } + pdu_complete(pdu, 7); +} + +static void 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); + + 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; + } +out: + put_fid(pdu, dfidp); +out_nofid: + v9fs_string_free(&name); + pdu_complete(pdu, err); +} + +/* Only works with path name based fid */ +static void 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 v9fs_unlinkat(void *opaque) +{ + int err = 0; + V9fsString name; + int32_t dfid, flags; + 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; + } + 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, flags); + 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 v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp, + int32_t newdirfid, V9fsString *name) +{ + char *end; + int err = 0; + V9fsPath new_path; + V9fsFidState *tfidp; + V9fsState *s = pdu->s; + V9fsFidState *dirfidp = NULL; + char *old_name, *new_name; + + v9fs_path_init(&new_path); + if (newdirfid != -1) { + dirfidp = get_fid(pdu, newdirfid); + if (dirfidp == NULL) { + err = -ENOENT; + goto out_nofid; + } + BUG_ON(dirfidp->fid_type != P9_FID_NONE); + v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path); + } else { + old_name = fidp->path.data; + end = strrchr(old_name, '/'); + if (end) { + end++; + } else { + end = old_name; + } + new_name = g_malloc0(end - old_name + name->size + 1); + strncat(new_name, old_name, end - old_name); + strncat(new_name + (end - old_name), name->data, name->size); + v9fs_co_name_to_path(pdu, NULL, new_name, &new_path); + g_free(new_name); + } + 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); +out_nofid: + return err; +} + +/* Only works with path name based fid */ +static void 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; + } + fidp = get_fid(pdu, fid); + if (fidp == NULL) { + err = -ENOENT; + goto out_nofid; + } + BUG_ON(fidp->fid_type != P9_FID_NONE); + /* 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 void 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; + + + v9fs_path_init(&oldpath); + v9fs_path_init(&newpath); + v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath); + v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath); + + /* + * 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)); + } + } + v9fs_path_free(&oldpath); + v9fs_path_free(&newpath); +} + +static int 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 */ + 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 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; + } + + 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 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; + + 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) { + err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name); + 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 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 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); + + 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; + } + stat_to_qid(&stbuf, &qid); + 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 v9fs_lock(void *opaque) +{ + int8_t status; + V9fsFlock flock; + size_t offset = 7; + struct stat stbuf; + V9fsFidState *fidp; + int32_t fid, err = 0; + V9fsPDU *pdu = opaque; + + status = P9_LOCK_ERROR; + 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; + } + status = P9_LOCK_SUCCESS; +out: + put_fid(pdu, fidp); +out_nofid: + err = pdu_marshal(pdu, offset, "b", status); + if (err > 0) { + err += offset; + } + trace_v9fs_lock_return(pdu->tag, pdu->id, status); + 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 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 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); + + 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; + } + stat_to_qid(&stbuf, &qid); + 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 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 (name.data == NULL) { + /* + * 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.copied_len = -1; + if (size) { + xattr_fidp->fs.xattr.value = g_malloc(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.copied_len = -1; + if (size) { + xattr_fidp->fs.xattr.value = g_malloc(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 v9fs_xattrcreate(void *opaque) +{ + int flags; + int32_t fid; + int64_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); + + file_fidp = get_fid(pdu, fid); + if (file_fidp == NULL) { + err = -EINVAL; + goto out_nofid; + } + /* 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.len = size; + xattr_fidp->fs.xattr.flags = flags; + v9fs_string_init(&xattr_fidp->fs.xattr.name); + v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name); + xattr_fidp->fs.xattr.value = g_malloc(size); + err = offset; + put_fid(pdu, file_fidp); +out_nofid: + pdu_complete(pdu, err); + v9fs_string_free(&name); +} + +static void 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 v9fs_op_not_supp(void *opaque) +{ + V9fsPDU *pdu = opaque; + pdu_complete(pdu, -EOPNOTSUPP); +} + +static void 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) +{ + Coroutine *co; + CoroutineEntry *handler; + V9fsState *s = pdu->s; + + if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) || + (pdu_co_handlers[pdu->id] == NULL)) { + handler = v9fs_op_not_supp; + } else { + handler = pdu_co_handlers[pdu->id]; + } + + if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { + handler = v9fs_fs_ro; + } + co = qemu_coroutine_create(handler); + qemu_coroutine_enter(co, pdu); +} + +static void __attribute__((__constructor__)) v9fs_set_fd_limit(void) +{ + struct rlimit rlim; + if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { + fprintf(stderr, "Failed to get the resource limit\n"); + exit(1); + } + open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur/3); + open_fd_rc = rlim.rlim_cur/2; +} |