virtio-9p: Add stat and mode related helper functions.
Add helpers to obtain file stat and mode details. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Anthony Liguori
parent
286d56526e
commit
bb9e3216bf
186
hw/virtio-9p.c
186
hw/virtio-9p.c
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@ -580,6 +580,188 @@ static void complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len)
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free_pdu(s, pdu);
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}
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static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension)
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{
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mode_t ret;
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ret = mode & 0777;
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if (mode & P9_STAT_MODE_DIR) {
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ret |= S_IFDIR;
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}
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if (dotu) {
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if (mode & P9_STAT_MODE_SYMLINK) {
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ret |= S_IFLNK;
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}
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if (mode & P9_STAT_MODE_SOCKET) {
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ret |= S_IFSOCK;
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}
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if (mode & P9_STAT_MODE_NAMED_PIPE) {
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ret |= S_IFIFO;
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}
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if (mode & P9_STAT_MODE_DEVICE) {
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if (extension && extension->data[0] == 'c') {
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ret |= S_IFCHR;
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} else {
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ret |= S_IFBLK;
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}
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}
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}
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if (!(ret&~0777)) {
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ret |= S_IFREG;
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}
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if (mode & P9_STAT_MODE_SETUID) {
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ret |= S_ISUID;
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}
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if (mode & P9_STAT_MODE_SETGID) {
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ret |= S_ISGID;
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}
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if (mode & P9_STAT_MODE_SETVTX) {
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ret |= S_ISVTX;
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}
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return ret;
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}
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static int donttouch_stat(V9fsStat *stat)
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{
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if (stat->type == -1 &&
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stat->dev == -1 &&
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stat->qid.type == -1 &&
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stat->qid.version == -1 &&
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stat->qid.path == -1 &&
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stat->mode == -1 &&
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stat->atime == -1 &&
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stat->mtime == -1 &&
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stat->length == -1 &&
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!stat->name.size &&
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!stat->uid.size &&
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!stat->gid.size &&
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!stat->muid.size &&
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stat->n_uid == -1 &&
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stat->n_gid == -1 &&
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stat->n_muid == -1) {
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return 1;
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}
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return 0;
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}
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static void v9fs_stat_free(V9fsStat *stat)
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{
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v9fs_string_free(&stat->name);
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v9fs_string_free(&stat->uid);
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v9fs_string_free(&stat->gid);
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v9fs_string_free(&stat->muid);
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v9fs_string_free(&stat->extension);
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}
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static uint32_t stat_to_v9mode(const struct stat *stbuf)
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{
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uint32_t mode;
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mode = stbuf->st_mode & 0777;
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if (S_ISDIR(stbuf->st_mode)) {
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mode |= P9_STAT_MODE_DIR;
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}
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if (dotu) {
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if (S_ISLNK(stbuf->st_mode)) {
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mode |= P9_STAT_MODE_SYMLINK;
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}
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if (S_ISSOCK(stbuf->st_mode)) {
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mode |= P9_STAT_MODE_SOCKET;
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}
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if (S_ISFIFO(stbuf->st_mode)) {
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mode |= P9_STAT_MODE_NAMED_PIPE;
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}
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if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) {
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mode |= P9_STAT_MODE_DEVICE;
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}
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if (stbuf->st_mode & S_ISUID) {
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mode |= P9_STAT_MODE_SETUID;
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}
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if (stbuf->st_mode & S_ISGID) {
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mode |= P9_STAT_MODE_SETGID;
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}
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if (stbuf->st_mode & S_ISVTX) {
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mode |= P9_STAT_MODE_SETVTX;
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}
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}
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return mode;
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}
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static int stat_to_v9stat(V9fsState *s, V9fsString *name,
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const struct stat *stbuf,
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V9fsStat *v9stat)
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{
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int err;
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const char *str;
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memset(v9stat, 0, sizeof(*v9stat));
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stat_to_qid(stbuf, &v9stat->qid);
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v9stat->mode = stat_to_v9mode(stbuf);
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v9stat->atime = stbuf->st_atime;
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v9stat->mtime = stbuf->st_mtime;
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v9stat->length = stbuf->st_size;
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v9fs_string_null(&v9stat->uid);
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v9fs_string_null(&v9stat->gid);
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v9fs_string_null(&v9stat->muid);
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if (dotu) {
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v9stat->n_uid = stbuf->st_uid;
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v9stat->n_gid = stbuf->st_gid;
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v9stat->n_muid = 0;
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v9fs_string_null(&v9stat->extension);
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if (v9stat->mode & P9_STAT_MODE_SYMLINK) {
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err = v9fs_do_readlink(s, name, &v9stat->extension);
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if (err == -1) {
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err = -errno;
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return err;
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}
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v9stat->extension.data[err] = 0;
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v9stat->extension.size = err;
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} else if (v9stat->mode & P9_STAT_MODE_DEVICE) {
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v9fs_string_sprintf(&v9stat->extension, "%c %u %u",
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S_ISCHR(stbuf->st_mode) ? 'c' : 'b',
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major(stbuf->st_rdev), minor(stbuf->st_rdev));
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} else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) {
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v9fs_string_sprintf(&v9stat->extension, "%s %u",
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"HARDLINKCOUNT", stbuf->st_nlink);
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}
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}
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str = strrchr(name->data, '/');
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if (str) {
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str += 1;
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} else {
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str = name->data;
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}
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v9fs_string_sprintf(&v9stat->name, "%s", str);
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v9stat->size = 61 +
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v9fs_string_size(&v9stat->name) +
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v9fs_string_size(&v9stat->uid) +
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v9fs_string_size(&v9stat->gid) +
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v9fs_string_size(&v9stat->muid) +
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v9fs_string_size(&v9stat->extension);
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return 0;
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}
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static void v9fs_dummy(V9fsState *s, V9fsPDU *pdu)
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{
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/* Note: The following have been added to prevent GCC from complaining
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@ -600,6 +782,10 @@ static void v9fs_dummy(V9fsState *s, V9fsPDU *pdu)
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(void) alloc_fid;
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(void) free_fid;
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(void) fid_to_qid;
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(void) v9mode_to_mode;
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(void) donttouch_stat;
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(void) v9fs_stat_free;
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(void) stat_to_v9stat;
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}
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static void v9fs_version(V9fsState *s, V9fsPDU *pdu)
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