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-rw-r--r--qemu/hw/9pfs/virtio-9p.c3300
1 files changed, 3300 insertions, 0 deletions
diff --git a/qemu/hw/9pfs/virtio-9p.c b/qemu/hw/9pfs/virtio-9p.c
new file mode 100644
index 000000000..f972731f5
--- /dev/null
+++ b/qemu/hw/9pfs/virtio-9p.c
@@ -0,0 +1,3300 @@
+/*
+ * 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 "virtio-9p-xattr.h"
+#include "virtio-9p-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,
+};
+
+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;
+}
+
+static V9fsPDU *alloc_pdu(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;
+}
+
+static void free_pdu(V9fsState *s, V9fsPDU *pdu)
+{
+ if (pdu) {
+ /*
+ * 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 complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len)
+{
+ int8_t id = pdu->id + 1; /* Response */
+
+ 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;
+
+ /* push onto queue and notify */
+ virtqueue_push(s->vq, &pdu->elem, len);
+
+ /* FIXME: we should batch these completions */
+ virtio_notify(VIRTIO_DEVICE(s), s->vq);
+
+ /* Now wakeup anybody waiting in flush for this request */
+ qemu_co_queue_next(&pdu->complete);
+
+ free_pdu(s, 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:
+ complete_pdu(s, 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:
+ complete_pdu(s, 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;
+ V9fsState *s = pdu->s;
+
+ 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:
+ complete_pdu(s, 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:
+ complete_pdu(s, 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;
+ V9fsState *s = pdu->s;
+
+ 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:
+ complete_pdu(s, 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) {
+ complete_pdu(s, 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:
+ complete_pdu(s, 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:
+ complete_pdu(s, 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:
+ complete_pdu(pdu->s, 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;
+ V9fsState *s = pdu->s;
+
+ 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:
+ complete_pdu(s, 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:
+ complete_pdu(s, 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;
+
+ if (is_write) {
+ iov = pdu->elem.out_sg;
+ niov = pdu->elem.out_num;
+ } else {
+ iov = pdu->elem.in_sg;
+ niov = pdu->elem.in_num;
+ }
+
+ 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:
+ complete_pdu(s, 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;
+ V9fsState *s = pdu->s;
+
+ 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:
+ complete_pdu(s, 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) {
+ complete_pdu(s, 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);
+ complete_pdu(s, 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:
+ complete_pdu(pdu->s, 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:
+ complete_pdu(pdu->s, 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) {
+ complete_pdu(s, 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;
+ free_pdu(pdu->s, cancel_pdu);
+ }
+ complete_pdu(s, pdu, 7);
+}
+
+static void v9fs_link(void *opaque)
+{
+ V9fsPDU *pdu = opaque;
+ V9fsState *s = pdu->s;
+ 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);
+ complete_pdu(s, 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:
+ complete_pdu(pdu->s, 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:
+ complete_pdu(pdu->s, 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:
+ complete_pdu(s, 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:
+ complete_pdu(s, 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;
+ V9fsState *s = pdu->s;
+
+ 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);
+ complete_pdu(s, 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:
+ complete_pdu(s, 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;
+ V9fsState *s = pdu->s;
+
+ 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:
+ complete_pdu(s, 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;
+ V9fsState *s = pdu->s;
+
+ 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);
+ complete_pdu(s, 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;
+ V9fsState *s = pdu->s;
+
+ 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:
+ complete_pdu(s, 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:
+ complete_pdu(pdu->s, 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:
+ complete_pdu(s, 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;
+ V9fsState *s = pdu->s;
+
+ 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:
+ complete_pdu(s, 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:
+ complete_pdu(pdu->s, 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;
+ complete_pdu(pdu->s, pdu, -EOPNOTSUPP);
+}
+
+static void v9fs_fs_ro(void *opaque)
+{
+ V9fsPDU *pdu = opaque;
+ complete_pdu(pdu->s, 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;
+ }
+}
+
+static void submit_pdu(V9fsState *s, V9fsPDU *pdu)
+{
+ Coroutine *co;
+ CoroutineEntry *handler;
+
+ 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);
+}
+
+void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
+{
+ V9fsState *s = (V9fsState *)vdev;
+ V9fsPDU *pdu;
+ ssize_t len;
+
+ while ((pdu = alloc_pdu(s)) &&
+ (len = virtqueue_pop(vq, &pdu->elem)) != 0) {
+ struct {
+ uint32_t size_le;
+ uint8_t id;
+ uint16_t tag_le;
+ } QEMU_PACKED out;
+ int len;
+
+ pdu->s = s;
+ BUG_ON(pdu->elem.out_num == 0 || pdu->elem.in_num == 0);
+ QEMU_BUILD_BUG_ON(sizeof out != 7);
+
+ len = iov_to_buf(pdu->elem.out_sg, pdu->elem.out_num, 0,
+ &out, sizeof out);
+ BUG_ON(len != sizeof out);
+
+ pdu->size = le32_to_cpu(out.size_le);
+
+ pdu->id = out.id;
+ pdu->tag = le16_to_cpu(out.tag_le);
+
+ qemu_co_queue_init(&pdu->complete);
+ submit_pdu(s, pdu);
+ }
+ free_pdu(s, pdu);
+}
+
+static void __attribute__((__constructor__)) virtio_9p_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;
+}