@@ -56,11 +56,15 @@ typedef struct extended_ops {
* On failure ignore the error.
*/
#define V9FS_SM_NONE 0x00000010
-#define V9FS_RDONLY 0x00000020
-#define V9FS_PROXY_SOCK_FD 0x00000040
-#define V9FS_PROXY_SOCK_NAME 0x00000080
+/*
+ * uid/gid part of .virtfs_meatadata namespace
+ */
+#define V9FS_SM_MAPPED_FILE 0x00000020
+#define V9FS_RDONLY 0x00000040
+#define V9FS_PROXY_SOCK_FD 0x00000080
+#define V9FS_PROXY_SOCK_NAME 0x00000100
-#define V9FS_SEC_MASK 0x0000001C
+#define V9FS_SEC_MASK 0x0000003C
typedef struct FileOperations FileOperations;
@@ -76,6 +76,20 @@ int v9fs_co_fstat(V9fsPDU *pdu, V9fsFidState *fidp, struct stat *stbuf)
err = -errno;
}
});
+ /*
+ * Some FS driver (local:mapped-file) can't support fetching attributes
+ * using file descriptor. Use Path name in that case.
+ */
+ if (err == -EOPNOTSUPP) {
+ err = v9fs_co_lstat(pdu, &fidp->path, stbuf);
+ if (err == -ENOENT) {
+ /*
+ * fstat on an unlinked file. Work with partial results
+ * returned from s->ops->fstat
+ */
+ err = 0;
+ }
+ }
return err;
}
@@ -91,15 +91,6 @@ VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf)
s->ctx.fs_root = NULL;
}
s->ctx.exops.get_st_gen = NULL;
-
- if (fse->export_flags & V9FS_SM_PASSTHROUGH) {
- s->ctx.xops = passthrough_xattr_ops;
- } else if (fse->export_flags & V9FS_SM_MAPPED) {
- s->ctx.xops = mapped_xattr_ops;
- } else if (fse->export_flags & V9FS_SM_NONE) {
- s->ctx.xops = none_xattr_ops;
- }
-
len = strlen(conf->tag);
if (len > MAX_TAG_LEN - 1) {
fprintf(stderr, "mount tag '%s' (%d bytes) is longer than "
@@ -20,6 +20,7 @@
#include <sys/socket.h>
#include <sys/un.h>
#include "qemu-xattr.h"
+#include <libgen.h>
#include <linux/fs.h>
#ifdef CONFIG_LINUX_MAGIC_H
#include <linux/magic.h>
@@ -39,6 +40,54 @@
#define BTRFS_SUPER_MAGIC 0x9123683E
#endif
+#define VIRTFS_META_DIR ".virtfs_metadata"
+
+static const char *local_mapped_attr_path(FsContext *ctx,
+ const char *path, char *buffer)
+{
+ char *dir_name;
+ char *tmp_path = strdup(path);
+ char *base_name = basename(tmp_path);
+
+ /* NULL terminate the directory */
+ dir_name = tmp_path;
+ *(base_name - 1) = '\0';
+
+ snprintf(buffer, PATH_MAX, "%s/%s/%s/%s",
+ ctx->fs_root, dir_name, VIRTFS_META_DIR, base_name);
+ free(tmp_path);
+ return buffer;
+}
+
+#define ATTR_MAX 100
+static void local_mapped_file_attr(FsContext *ctx, const char *path,
+ struct stat *stbuf)
+{
+ FILE *fp;
+ char buf[ATTR_MAX];
+ char attr_path[PATH_MAX];
+
+ local_mapped_attr_path(ctx, path, attr_path);
+ fp = fopen(attr_path, "r");
+ if (!fp) {
+ return;
+ }
+ memset(buf, 0, ATTR_MAX);
+ while (fgets(buf, ATTR_MAX, fp)) {
+ if (!strncmp(buf, "virtfs.uid", 10)) {
+ stbuf->st_uid = atoi(buf+11);
+ } else if (!strncmp(buf, "virtfs.gid", 10)) {
+ stbuf->st_gid = atoi(buf+11);
+ } else if (!strncmp(buf, "virtfs.mode", 11)) {
+ stbuf->st_mode = atoi(buf+12);
+ } else if (!strncmp(buf, "virtfs.rdev", 11)) {
+ stbuf->st_rdev = atoi(buf+12);
+ }
+ memset(buf, 0, ATTR_MAX);
+ }
+ fclose(fp);
+}
+
static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf)
{
int err;
@@ -71,10 +120,94 @@ static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf)
sizeof(dev_t)) > 0) {
stbuf->st_rdev = tmp_dev;
}
+ } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+ local_mapped_file_attr(fs_ctx, path, stbuf);
+ }
+ return err;
+}
+
+static int local_create_mapped_attr_dir(FsContext *ctx, const char *path)
+{
+ int err;
+ char attr_dir[PATH_MAX];
+ char *tmp_path = strdup(path);
+
+ snprintf(attr_dir, PATH_MAX, "%s/%s/%s",
+ ctx->fs_root, dirname(tmp_path), VIRTFS_META_DIR);
+
+ err = mkdir(attr_dir, 0700);
+ if (err < 0 && errno == EEXIST) {
+ err = 0;
}
+ free(tmp_path);
return err;
}
+static int local_set_mapped_file_attr(FsContext *ctx,
+ const char *path, FsCred *credp)
+{
+ FILE *fp;
+ int ret = 0;
+ char buf[ATTR_MAX];
+ char attr_path[PATH_MAX];
+ int uid, gid, mode, rdev;
+
+ fp = fopen(local_mapped_attr_path(ctx, path, attr_path), "r");
+ if (!fp) {
+ goto create_map_file;
+ }
+ memset(buf, 0, ATTR_MAX);
+ while (fgets(buf, ATTR_MAX, fp)) {
+ if (!strncmp(buf, "virtfs.uid", 10)) {
+ uid = atoi(buf+11);
+ } else if (!strncmp(buf, "virtfs.gid", 10)) {
+ gid = atoi(buf+11);
+ } else if (!strncmp(buf, "virtfs.mode", 11)) {
+ mode = atoi(buf+12);
+ } else if (!strncmp(buf, "virtfs.rdev", 11)) {
+ rdev = atoi(buf+12);
+ }
+ memset(buf, 0, ATTR_MAX);
+ }
+ fclose(fp);
+ goto update_map_file;
+
+create_map_file:
+ ret = local_create_mapped_attr_dir(ctx, path);
+ if (ret < 0) {
+ goto err_out;
+ }
+
+update_map_file:
+ fp = fopen(attr_path, "w");
+ if (!fp) {
+ ret = -1;
+ goto err_out;
+ }
+
+ if (credp->fc_uid != -1) {
+ uid = credp->fc_uid;
+ }
+ if (credp->fc_gid != -1) {
+ gid = credp->fc_gid;
+ }
+ if (credp->fc_mode != -1) {
+ mode = credp->fc_mode;
+ }
+ if (credp->fc_rdev != -1) {
+ rdev = credp->fc_rdev;
+ }
+ fprintf(fp, "virtfs.uid=%d\n", uid);
+ fprintf(fp, "virtfs.gid=%d\n", gid);
+ fprintf(fp, "virtfs.mode=%d\n", mode);
+ fprintf(fp, "virtfs.rdev=%d\n", rdev);
+
+ fclose(fp);
+
+err_out:
+ return ret;
+}
+
static int local_set_xattr(const char *path, FsCred *credp)
{
int err;
@@ -138,7 +271,8 @@ static ssize_t local_readlink(FsContext *fs_ctx, V9fsPath *fs_path,
char buffer[PATH_MAX];
char *path = fs_path->data;
- if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
+ if ((fs_ctx->export_flags & V9FS_SM_MAPPED) ||
+ (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE)) {
int fd;
fd = open(rpath(fs_ctx, path, buffer), O_RDONLY);
if (fd == -1) {
@@ -203,7 +337,18 @@ static int local_readdir_r(FsContext *ctx, V9fsFidOpenState *fs,
struct dirent *entry,
struct dirent **result)
{
- return readdir_r(fs->dir, entry, result);
+ int ret;
+
+again:
+ ret = readdir_r(fs->dir, entry, result);
+ if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+ if (!ret && *result != NULL &&
+ !strcmp(entry->d_name, VIRTFS_META_DIR)) {
+ /* skp the meta data directory */
+ goto again;
+ }
+ }
+ return ret;
}
static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
@@ -264,6 +409,8 @@ static int local_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
return local_set_xattr(rpath(fs_ctx, path, buffer), credp);
+ } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+ return local_set_mapped_file_attr(fs_ctx, path, credp);
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
(fs_ctx->export_flags & V9FS_SM_NONE)) {
return chmod(rpath(fs_ctx, path, buffer), credp->fc_mode);
@@ -296,6 +443,18 @@ static int local_mknod(FsContext *fs_ctx, V9fsPath *dir_path,
serrno = errno;
goto err_end;
}
+ } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+
+ err = mknod(rpath(fs_ctx, path, buffer),
+ SM_LOCAL_MODE_BITS|S_IFREG, 0);
+ if (err == -1) {
+ goto out;
+ }
+ err = local_set_mapped_file_attr(fs_ctx, path, credp);
+ if (err == -1) {
+ serrno = errno;
+ goto err_end;
+ }
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
(fs_ctx->export_flags & V9FS_SM_NONE)) {
err = mknod(rpath(fs_ctx, path, buffer), credp->fc_mode,
@@ -344,6 +503,17 @@ static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path,
serrno = errno;
goto err_end;
}
+ } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+ err = mkdir(rpath(fs_ctx, path, buffer), SM_LOCAL_DIR_MODE_BITS);
+ if (err == -1) {
+ goto out;
+ }
+ credp->fc_mode = credp->fc_mode|S_IFDIR;
+ err = local_set_mapped_file_attr(fs_ctx, path, credp);
+ if (err == -1) {
+ serrno = errno;
+ goto err_end;
+ }
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
(fs_ctx->export_flags & V9FS_SM_NONE)) {
err = mkdir(rpath(fs_ctx, path, buffer), credp->fc_mode);
@@ -404,6 +574,9 @@ static int local_fstat(FsContext *fs_ctx, int fid_type,
&tmp_dev, sizeof(dev_t)) > 0) {
stbuf->st_rdev = tmp_dev;
}
+ } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+ errno = EOPNOTSUPP;
+ return -1;
}
return err;
}
@@ -436,6 +609,19 @@ static int local_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name,
serrno = errno;
goto err_end;
}
+ } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+ fd = open(rpath(fs_ctx, path, buffer), flags, SM_LOCAL_MODE_BITS);
+ if (fd == -1) {
+ err = fd;
+ goto out;
+ }
+ credp->fc_mode = credp->fc_mode|S_IFREG;
+ /* Set client credentials in .virtfs_metadata directory files */
+ err = local_set_mapped_file_attr(fs_ctx, path, credp);
+ if (err == -1) {
+ serrno = errno;
+ goto err_end;
+ }
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
(fs_ctx->export_flags & V9FS_SM_NONE)) {
fd = open(rpath(fs_ctx, path, buffer), flags, credp->fc_mode);
@@ -506,6 +692,35 @@ static int local_symlink(FsContext *fs_ctx, const char *oldpath,
serrno = errno;
goto err_end;
}
+ } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+ int fd;
+ ssize_t oldpath_size, write_size;
+ fd = open(rpath(fs_ctx, newpath, buffer), O_CREAT|O_EXCL|O_RDWR,
+ SM_LOCAL_MODE_BITS);
+ if (fd == -1) {
+ err = fd;
+ goto out;
+ }
+ /* Write the oldpath (target) to the file. */
+ oldpath_size = strlen(oldpath);
+ do {
+ write_size = write(fd, (void *)oldpath, oldpath_size);
+ } while (write_size == -1 && errno == EINTR);
+
+ if (write_size != oldpath_size) {
+ serrno = errno;
+ close(fd);
+ err = -1;
+ goto err_end;
+ }
+ close(fd);
+ /* Set cleint credentials in symlink's xattr */
+ credp->fc_mode = credp->fc_mode|S_IFLNK;
+ err = local_set_mapped_file_attr(fs_ctx, newpath, credp);
+ if (err == -1) {
+ serrno = errno;
+ goto err_end;
+ }
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
(fs_ctx->export_flags & V9FS_SM_NONE)) {
err = symlink(oldpath, rpath(fs_ctx, newpath, buffer));
@@ -548,6 +763,21 @@ static int local_link(FsContext *ctx, V9fsPath *oldpath,
ret = link(rpath(ctx, oldpath->data, buffer),
rpath(ctx, newpath.data, buffer1));
+
+ /* now link the virtfs_metadata files */
+ if (!ret && (ctx->export_flags & V9FS_SM_MAPPED_FILE)) {
+ /* Link the .virtfs_metadata files. Create the metada directory */
+ ret = local_create_mapped_attr_dir(ctx, newpath.data);
+ if (ret < 0) {
+ goto err_out;
+ }
+ ret = link(local_mapped_attr_path(ctx, oldpath->data, buffer),
+ local_mapped_attr_path(ctx, newpath.data, buffer1));
+ if (ret < 0 && errno != ENOENT) {
+ goto err_out;
+ }
+ }
+err_out:
v9fs_string_free(&newpath);
return ret;
}
@@ -563,8 +793,21 @@ static int local_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size)
static int local_rename(FsContext *ctx, const char *oldpath,
const char *newpath)
{
+ int err;
char buffer[PATH_MAX], buffer1[PATH_MAX];
+ if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+ err = local_create_mapped_attr_dir(ctx, newpath);
+ if (err < 0) {
+ return err;
+ }
+ /* rename the .virtfs_metadata files */
+ err = rename(local_mapped_attr_path(ctx, oldpath, buffer),
+ local_mapped_attr_path(ctx, newpath, buffer1));
+ if (err < 0 && errno != ENOENT) {
+ return err;
+ }
+ }
return rename(rpath(ctx, oldpath, buffer), rpath(ctx, newpath, buffer1));
}
@@ -580,6 +823,8 @@ static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
credp->fc_uid, credp->fc_gid);
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
return local_set_xattr(rpath(fs_ctx, path, buffer), credp);
+ } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+ return local_set_mapped_file_attr(fs_ctx, path, credp);
}
return -1;
}
@@ -595,8 +840,46 @@ static int local_utimensat(FsContext *s, V9fsPath *fs_path,
static int local_remove(FsContext *ctx, const char *path)
{
+ int err;
+ struct stat stbuf;
char buffer[PATH_MAX];
+
+ if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+ err = lstat(rpath(ctx, path, buffer), &stbuf);
+ if (err) {
+ goto err_out;
+ }
+ /*
+ * If directory remove .virtfs_metadata contained in the
+ * directory
+ */
+ if (S_ISDIR(stbuf.st_mode)) {
+ sprintf(buffer, "%s/%s/%s", ctx->fs_root, path, VIRTFS_META_DIR);
+ err = remove(buffer);
+ if (err < 0 && errno != ENOENT) {
+ /*
+ * We didn't had the .virtfs_metadata file. May be file created
+ * in non-mapped mode ?. Ignore ENOENT.
+ */
+ goto err_out;
+ }
+ }
+ /*
+ * Now remove the name from parent directory
+ * .virtfs_metadata directory
+ */
+ err = remove(local_mapped_attr_path(ctx, path, buffer));;
+ if (err < 0 && errno != ENOENT) {
+ /*
+ * We didn't had the .virtfs_metadata file. May be file created
+ * in non-mapped mode ?. Ignore ENOENT.
+ */
+ goto err_out;
+ }
+ }
return remove(rpath(ctx, path, buffer));
+err_out:
+ return err;
}
static int local_fsync(FsContext *ctx, int fid_type,
@@ -696,12 +979,45 @@ static int local_unlinkat(FsContext *ctx, V9fsPath *dir,
int ret;
V9fsString fullname;
char buffer[PATH_MAX];
+
v9fs_string_init(&fullname);
v9fs_string_sprintf(&fullname, "%s/%s", dir->data, name);
+ if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+ if (flags == AT_REMOVEDIR) {
+ /*
+ * If directory remove .virtfs_metadata contained in the
+ * directory
+ */
+ sprintf(buffer, "%s/%s/%s", ctx->fs_root,
+ fullname.data, VIRTFS_META_DIR);
+ ret = remove(buffer);
+ if (ret < 0 && errno != ENOENT) {
+ /*
+ * We didn't had the .virtfs_metadata file. May be file created
+ * in non-mapped mode ?. Ignore ENOENT.
+ */
+ goto err_out;
+ }
+ }
+ /*
+ * Now remove the name from parent directory
+ * .virtfs_metadata directory.
+ */
+ ret = remove(local_mapped_attr_path(ctx, fullname.data, buffer));
+ if (ret < 0 && errno != ENOENT) {
+ /*
+ * We didn't had the .virtfs_metadata file. May be file created
+ * in non-mapped mode ?. Ignore ENOENT.
+ */
+ goto err_out;
+ }
+ }
+ /* Remove the name finally */
ret = remove(rpath(ctx, fullname.data, buffer));
v9fs_string_free(&fullname);
+err_out:
return ret;
}
@@ -736,6 +1052,19 @@ static int local_init(FsContext *ctx)
int err = 0;
struct statfs stbuf;
+ if (ctx->export_flags & V9FS_SM_PASSTHROUGH) {
+ ctx->xops = passthrough_xattr_ops;
+ } else if (ctx->export_flags & V9FS_SM_MAPPED) {
+ ctx->xops = mapped_xattr_ops;
+ } else if (ctx->export_flags & V9FS_SM_NONE) {
+ ctx->xops = none_xattr_ops;
+ } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
+ /*
+ * xattr operation for mapped-file and passthrough
+ * remain same.
+ */
+ ctx->xops = passthrough_xattr_ops;
+ }
ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT;
#ifdef FS_IOC_GETVERSION
/*
@@ -770,13 +1099,17 @@ static int local_parse_opts(QemuOpts *opts, struct FsDriverEntry *fse)
if (!strcmp(sec_model, "passthrough")) {
fse->export_flags |= V9FS_SM_PASSTHROUGH;
- } else if (!strcmp(sec_model, "mapped")) {
+ } else if (!strcmp(sec_model, "mapped") ||
+ !strcmp(sec_model, "mapped-xattr")) {
fse->export_flags |= V9FS_SM_MAPPED;
} else if (!strcmp(sec_model, "none")) {
fse->export_flags |= V9FS_SM_NONE;
+ } else if (!strcmp(sec_model, "mapped-file")) {
+ fse->export_flags |= V9FS_SM_MAPPED_FILE;
} else {
fprintf(stderr, "Invalid security model %s specified, valid options are"
- "\n\t [passthrough|mapped|none]\n", sec_model);
+ "\n\t [passthrough|mapped-xattr|mapped-file|none]\n",
+ sec_model);
return -1;
}