diff options
Diffstat (limited to 'hw/virtio-9p.c')
| -rw-r--r-- | hw/virtio-9p.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c index 7668e52586..4467aea3ff 100644 --- a/hw/virtio-9p.c +++ b/hw/virtio-9p.c @@ -176,6 +176,126 @@ static size_t v9fs_string_size(V9fsString *str) return str->size; } +static V9fsFidState *lookup_fid(V9fsState *s, int32_t fid) +{ + V9fsFidState *f; + + for (f = s->fid_list; f; f = f->next) { + if (f->fid == fid) { + v9fs_do_setuid(s, f->uid); + return f; + } + } + + return NULL; +} + +static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) +{ + V9fsFidState *f; + + f = lookup_fid(s, fid); + if (f) { + return NULL; + } + + f = qemu_mallocz(sizeof(V9fsFidState)); + + f->fid = fid; + f->fd = -1; + f->dir = NULL; + + f->next = s->fid_list; + s->fid_list = f; + + return f; +} + +static int free_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 -ENOENT; + } + + fidp = *fidpp; + *fidpp = fidp->next; + + if (fidp->fd != -1) { + v9fs_do_close(s, fidp->fd); + } + if (fidp->dir) { + v9fs_do_closedir(s, fidp->dir); + } + v9fs_string_free(&fidp->path); + qemu_free(fidp); + + return 0; +} + +#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; + + 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(V9fsState *s, V9fsFidState *fidp, V9fsQID *qidp) +{ + struct stat stbuf; + int err; + + err = v9fs_do_lstat(s, &fidp->path, &stbuf); + if (err) { + return err; + } + + stat_to_qid(&stbuf, qidp); + return 0; +} + static V9fsPDU *alloc_pdu(V9fsState *s) { V9fsPDU *pdu = NULL; @@ -477,6 +597,9 @@ static void v9fs_dummy(V9fsState *s, V9fsPDU *pdu) (void) v9fs_do_readlink; (void) v9fs_do_close; (void) v9fs_do_closedir; + (void) alloc_fid; + (void) free_fid; + (void) fid_to_qid; } static void v9fs_version(V9fsState *s, V9fsPDU *pdu) |