#include "qemu/osdep.h"
#include "9p.h"
+#include "9p-local.h"
#include "9p-xattr.h"
+#include "9p-util.h"
#include "fsdev/qemu-fsdev.h" /* local_ops */
#include <arpa/inet.h>
#include <pwd.h>
#define BTRFS_SUPER_MAGIC 0x9123683E
#endif
+typedef struct {
+ int mountfd;
+} LocalData;
+
+int local_open_nofollow(FsContext *fs_ctx, const char *path, int flags,
+ mode_t mode)
+{
+ LocalData *data = fs_ctx->private;
+
+ /* All paths are relative to the path data->mountfd points to */
+ while (*path == '/') {
+ path++;
+ }
+
+ return relative_openat_nofollow(data->mountfd, path, flags, mode);
+}
+
+int local_opendir_nofollow(FsContext *fs_ctx, const char *path)
+{
+ return local_open_nofollow(fs_ctx, path, O_DIRECTORY | O_RDONLY, 0);
+}
+
#define VIRTFS_META_DIR ".virtfs_metadata"
static char *local_mapped_attr_path(FsContext *ctx, const char *path)
return fp;
}
+static FILE *local_fopenat(int dirfd, const char *name, const char *mode)
+{
+ int fd, o_mode = 0;
+ FILE *fp;
+ int flags;
+ /*
+ * only supports two modes
+ */
+ if (mode[0] == 'r') {
+ flags = O_RDONLY;
+ } else if (mode[0] == 'w') {
+ flags = O_WRONLY | O_TRUNC | O_CREAT;
+ o_mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
+ } else {
+ return NULL;
+ }
+ fd = openat_file(dirfd, name, flags, o_mode);
+ if (fd == -1) {
+ return NULL;
+ }
+ fp = fdopen(fd, mode);
+ if (!fp) {
+ close(fd);
+ }
+ return fp;
+}
+
#define ATTR_MAX 100
-static void local_mapped_file_attr(FsContext *ctx, const char *path,
+static void local_mapped_file_attr(int dirfd, const char *name,
struct stat *stbuf)
{
FILE *fp;
char buf[ATTR_MAX];
- char *attr_path;
+ int map_dirfd;
- attr_path = local_mapped_attr_path(ctx, path);
- fp = local_fopen(attr_path, "r");
- g_free(attr_path);
+ map_dirfd = openat(dirfd, VIRTFS_META_DIR,
+ O_RDONLY | O_DIRECTORY | O_NOFOLLOW);
+ if (map_dirfd == -1) {
+ return;
+ }
+
+ fp = local_fopenat(map_dirfd, name, "r");
+ close_preserve_errno(map_dirfd);
if (!fp) {
return;
}
static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf)
{
- int err;
- char *buffer;
- char *path = fs_path->data;
+ int err = -1;
+ char *dirpath = g_path_get_dirname(fs_path->data);
+ char *name = g_path_get_basename(fs_path->data);
+ int dirfd;
- buffer = rpath(fs_ctx, path);
- err = lstat(buffer, stbuf);
+ dirfd = local_opendir_nofollow(fs_ctx, dirpath);
+ if (dirfd == -1) {
+ goto out;
+ }
+
+ err = fstatat(dirfd, name, stbuf, AT_SYMLINK_NOFOLLOW);
if (err) {
goto err_out;
}
gid_t tmp_gid;
mode_t tmp_mode;
dev_t tmp_dev;
- if (getxattr(buffer, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) {
+
+ if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.uid", &tmp_uid,
+ sizeof(uid_t)) > 0) {
stbuf->st_uid = le32_to_cpu(tmp_uid);
}
- if (getxattr(buffer, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) {
+ if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.gid", &tmp_gid,
+ sizeof(gid_t)) > 0) {
stbuf->st_gid = le32_to_cpu(tmp_gid);
}
- if (getxattr(buffer, "user.virtfs.mode",
- &tmp_mode, sizeof(mode_t)) > 0) {
+ if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.mode", &tmp_mode,
+ sizeof(mode_t)) > 0) {
stbuf->st_mode = le32_to_cpu(tmp_mode);
}
- if (getxattr(buffer, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) {
+ if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.rdev", &tmp_dev,
+ sizeof(dev_t)) > 0) {
stbuf->st_rdev = le64_to_cpu(tmp_dev);
}
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
- local_mapped_file_attr(fs_ctx, path, stbuf);
+ local_mapped_file_attr(dirfd, name, stbuf);
}
err_out:
- g_free(buffer);
+ close_preserve_errno(dirfd);
+out:
+ g_free(name);
+ g_free(dirpath);
return err;
}
char *buf, size_t bufsz)
{
ssize_t tsize = -1;
- char *buffer;
- char *path = fs_path->data;
if ((fs_ctx->export_flags & V9FS_SM_MAPPED) ||
(fs_ctx->export_flags & V9FS_SM_MAPPED_FILE)) {
int fd;
- buffer = rpath(fs_ctx, path);
- fd = open(buffer, O_RDONLY | O_NOFOLLOW);
- g_free(buffer);
+
+ fd = local_open_nofollow(fs_ctx, fs_path->data, O_RDONLY, 0);
if (fd == -1) {
return -1;
}
do {
tsize = read(fd, (void *)buf, bufsz);
} while (tsize == -1 && errno == EINTR);
- close(fd);
+ close_preserve_errno(fd);
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
(fs_ctx->export_flags & V9FS_SM_NONE)) {
- buffer = rpath(fs_ctx, path);
- tsize = readlink(buffer, buf, bufsz);
- g_free(buffer);
+ char *dirpath = g_path_get_dirname(fs_path->data);
+ char *name = g_path_get_basename(fs_path->data);
+ int dirfd;
+
+ dirfd = local_opendir_nofollow(fs_ctx, dirpath);
+ if (dirfd == -1) {
+ goto out;
+ }
+
+ tsize = readlinkat(dirfd, name, buf, bufsz);
+ close_preserve_errno(dirfd);
+ out:
+ g_free(name);
+ g_free(dirpath);
}
return tsize;
}
static int local_closedir(FsContext *ctx, V9fsFidOpenState *fs)
{
- return closedir(fs->dir);
+ return closedir(fs->dir.stream);
}
static int local_open(FsContext *ctx, V9fsPath *fs_path,
int flags, V9fsFidOpenState *fs)
{
- char *buffer;
- char *path = fs_path->data;
+ int fd;
- buffer = rpath(ctx, path);
- fs->fd = open(buffer, flags | O_NOFOLLOW);
- g_free(buffer);
+ fd = local_open_nofollow(ctx, fs_path->data, flags, 0);
+ if (fd == -1) {
+ return -1;
+ }
+ fs->fd = fd;
return fs->fd;
}
static int local_opendir(FsContext *ctx,
V9fsPath *fs_path, V9fsFidOpenState *fs)
{
- char *buffer;
- char *path = fs_path->data;
+ int dirfd;
+ DIR *stream;
- buffer = rpath(ctx, path);
- fs->dir = opendir(buffer);
- g_free(buffer);
- if (!fs->dir) {
+ dirfd = local_opendir_nofollow(ctx, fs_path->data);
+ if (dirfd == -1) {
+ return -1;
+ }
+
+ stream = fdopendir(dirfd);
+ if (!stream) {
return -1;
}
+ fs->dir.stream = stream;
return 0;
}
static void local_rewinddir(FsContext *ctx, V9fsFidOpenState *fs)
{
- rewinddir(fs->dir);
+ rewinddir(fs->dir.stream);
}
static off_t local_telldir(FsContext *ctx, V9fsFidOpenState *fs)
{
- return telldir(fs->dir);
+ return telldir(fs->dir.stream);
}
-static int local_readdir_r(FsContext *ctx, V9fsFidOpenState *fs,
- struct dirent *entry,
- struct dirent **result)
+static struct dirent *local_readdir(FsContext *ctx, V9fsFidOpenState *fs)
{
- int ret;
+ struct dirent *entry;
again:
- ret = readdir_r(fs->dir, entry, result);
+ entry = readdir(fs->dir.stream);
+ if (!entry) {
+ return NULL;
+ }
+
if (ctx->export_flags & V9FS_SM_MAPPED) {
entry->d_type = DT_UNKNOWN;
} else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
- if (!ret && *result != NULL &&
- !strcmp(entry->d_name, VIRTFS_META_DIR)) {
+ if (!strcmp(entry->d_name, VIRTFS_META_DIR)) {
/* skp the meta data directory */
goto again;
}
entry->d_type = DT_UNKNOWN;
}
- return ret;
+
+ return entry;
}
static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
{
- seekdir(fs->dir, off);
+ seekdir(fs->dir.stream, off);
}
static ssize_t local_preadv(FsContext *ctx, V9fsFidOpenState *fs,
const struct iovec *iov,
int iovcnt, off_t offset)
{
- ssize_t ret
-;
+ ssize_t ret;
#ifdef CONFIG_PREADV
ret = pwritev(fs->fd, iov, iovcnt, offset);
#else
int err, fd;
if (fid_type == P9_FID_DIR) {
- fd = dirfd(fs->dir);
+ fd = dirfd(fs->dir.stream);
} else {
fd = fs->fd;
}
static int local_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size)
{
- char *buffer;
- int ret;
- char *path = fs_path->data;
+ int fd, ret;
- buffer = rpath(ctx, path);
- ret = truncate(buffer, size);
- g_free(buffer);
+ fd = local_open_nofollow(ctx, fs_path->data, O_WRONLY, 0);
+ if (fd == -1) {
+ return -1;
+ }
+ ret = ftruncate(fd, size);
+ close_preserve_errno(fd);
return ret;
}
static int local_utimensat(FsContext *s, V9fsPath *fs_path,
const struct timespec *buf)
{
- char *buffer;
- int ret;
- char *path = fs_path->data;
+ char *dirpath = g_path_get_dirname(fs_path->data);
+ char *name = g_path_get_basename(fs_path->data);
+ int dirfd, ret = -1;
- buffer = rpath(s, path);
- ret = qemu_utimens(buffer, buf);
- g_free(buffer);
+ dirfd = local_opendir_nofollow(s, dirpath);
+ if (dirfd == -1) {
+ goto out;
+ }
+
+ ret = utimensat(dirfd, name, buf, AT_SYMLINK_NOFOLLOW);
+ close_preserve_errno(dirfd);
+out:
+ g_free(dirpath);
+ g_free(name);
return ret;
}
-static int local_remove(FsContext *ctx, const char *path)
+static int local_unlinkat_common(FsContext *ctx, int dirfd, const char *name,
+ int flags)
{
- int err;
- struct stat stbuf;
- char *buffer;
+ int ret = -1;
if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
- buffer = rpath(ctx, path);
- err = lstat(buffer, &stbuf);
- g_free(buffer);
- if (err) {
- goto err_out;
- }
- /*
- * If directory remove .virtfs_metadata contained in the
- * directory
- */
- if (S_ISDIR(stbuf.st_mode)) {
- buffer = g_strdup_printf("%s/%s/%s", ctx->fs_root,
- path, VIRTFS_META_DIR);
- err = remove(buffer);
- g_free(buffer);
- if (err < 0 && errno != ENOENT) {
+ int map_dirfd;
+
+ if (flags == AT_REMOVEDIR) {
+ int fd;
+
+ fd = openat(dirfd, name, O_RDONLY | O_DIRECTORY | O_PATH);
+ if (fd == -1) {
+ goto err_out;
+ }
+ /*
+ * If directory remove .virtfs_metadata contained in the
+ * directory
+ */
+ ret = unlinkat(fd, VIRTFS_META_DIR, AT_REMOVEDIR);
+ close_preserve_errno(fd);
+ if (ret < 0 && errno != ENOENT) {
/*
* We didn't had the .virtfs_metadata file. May be file created
* in non-mapped mode ?. Ignore ENOENT.
}
/*
* Now remove the name from parent directory
- * .virtfs_metadata directory
+ * .virtfs_metadata directory.
*/
- buffer = local_mapped_attr_path(ctx, path);
- err = remove(buffer);
- g_free(buffer);
- if (err < 0 && errno != ENOENT) {
+ map_dirfd = openat_dir(dirfd, VIRTFS_META_DIR);
+ ret = unlinkat(map_dirfd, name, 0);
+ close_preserve_errno(map_dirfd);
+ if (ret < 0 && errno != ENOENT) {
/*
* We didn't had the .virtfs_metadata file. May be file created
* in non-mapped mode ?. Ignore ENOENT.
}
}
- buffer = rpath(ctx, path);
- err = remove(buffer);
- g_free(buffer);
+ ret = unlinkat(dirfd, name, flags);
err_out:
+ return ret;
+}
+
+static int local_remove(FsContext *ctx, const char *path)
+{
+ struct stat stbuf;
+ char *dirpath = g_path_get_dirname(path);
+ char *name = g_path_get_basename(path);
+ int flags = 0;
+ int dirfd;
+ int err = -1;
+
+ dirfd = local_opendir_nofollow(ctx, dirpath);
+ if (dirfd) {
+ goto out;
+ }
+
+ if (fstatat(dirfd, path, &stbuf, AT_SYMLINK_NOFOLLOW) < 0) {
+ goto err_out;
+ }
+
+ if (S_ISDIR(stbuf.st_mode)) {
+ flags |= AT_REMOVEDIR;
+ }
+
+ err = local_unlinkat_common(ctx, dirfd, name, flags);
+err_out:
+ close_preserve_errno(dirfd);
+out:
+ g_free(name);
+ g_free(dirpath);
return err;
}
int fd;
if (fid_type == P9_FID_DIR) {
- fd = dirfd(fs->dir);
+ fd = dirfd(fs->dir.stream);
} else {
fd = fs->fd;
}
static int local_statfs(FsContext *s, V9fsPath *fs_path, struct statfs *stbuf)
{
- char *buffer;
- int ret;
- char *path = fs_path->data;
+ int fd, ret;
- buffer = rpath(s, path);
- ret = statfs(buffer, stbuf);
- g_free(buffer);
+ fd = local_open_nofollow(s, fs_path->data, O_RDONLY, 0);
+ ret = fstatfs(fd, stbuf);
+ close_preserve_errno(fd);
return ret;
}
const char *name, V9fsPath *target)
{
if (dir_path) {
- v9fs_string_sprintf((V9fsString *)target, "%s/%s",
- dir_path->data, name);
+ v9fs_path_sprintf(target, "%s/%s", dir_path->data, name);
} else {
- v9fs_string_sprintf((V9fsString *)target, "%s", name);
+ v9fs_path_sprintf(target, "%s", name);
}
- /* Bump the size for including terminating NULL */
- target->size++;
return 0;
}
const char *name, int flags)
{
int ret;
- V9fsString fullname;
- char *buffer;
+ int dirfd;
- 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
- */
- buffer = g_strdup_printf("%s/%s/%s", ctx->fs_root,
- fullname.data, VIRTFS_META_DIR);
- ret = remove(buffer);
- g_free(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.
- */
- buffer = local_mapped_attr_path(ctx, fullname.data);
- ret = remove(buffer);
- g_free(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;
- }
+ dirfd = local_opendir_nofollow(ctx, dir->data);
+ if (dirfd == -1) {
+ return -1;
}
- /* Remove the name finally */
- buffer = rpath(ctx, fullname.data);
- ret = remove(buffer);
- g_free(buffer);
-err_out:
- v9fs_string_free(&fullname);
+ ret = local_unlinkat_common(ctx, dirfd, name, flags);
+ close_preserve_errno(dirfd);
return ret;
}
static int local_init(FsContext *ctx)
{
- int err = 0;
struct statfs stbuf;
+ LocalData *data = g_malloc(sizeof(*data));
+
+ data->mountfd = open(ctx->fs_root, O_DIRECTORY | O_RDONLY);
+ if (data->mountfd == -1) {
+ goto err;
+ }
+
+#ifdef FS_IOC_GETVERSION
+ /*
+ * use ioc_getversion only if the ioctl is definied
+ */
+ if (fstatfs(data->mountfd, &stbuf) < 0) {
+ close_preserve_errno(data->mountfd);
+ goto err;
+ }
+ switch (stbuf.f_type) {
+ case EXT2_SUPER_MAGIC:
+ case BTRFS_SUPER_MAGIC:
+ case REISERFS_SUPER_MAGIC:
+ case XFS_SUPER_MAGIC:
+ ctx->exops.get_st_gen = local_ioc_getversion;
+ break;
+ }
+#endif
if (ctx->export_flags & V9FS_SM_PASSTHROUGH) {
ctx->xops = passthrough_xattr_ops;
ctx->xops = passthrough_xattr_ops;
}
ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT;
-#ifdef FS_IOC_GETVERSION
- /*
- * use ioc_getversion only if the iocl is definied
- */
- err = statfs(ctx->fs_root, &stbuf);
- if (!err) {
- switch (stbuf.f_type) {
- case EXT2_SUPER_MAGIC:
- case BTRFS_SUPER_MAGIC:
- case REISERFS_SUPER_MAGIC:
- case XFS_SUPER_MAGIC:
- ctx->exops.get_st_gen = local_ioc_getversion;
- break;
- }
- }
-#endif
- return err;
+
+ ctx->private = data;
+ return 0;
+
+err:
+ g_free(data);
+ return -1;
+}
+
+static void local_cleanup(FsContext *ctx)
+{
+ LocalData *data = ctx->private;
+
+ close(data->mountfd);
+ g_free(data);
}
static int local_parse_opts(QemuOpts *opts, struct FsDriverEntry *fse)
FileOperations local_ops = {
.parse_opts = local_parse_opts,
.init = local_init,
+ .cleanup = local_cleanup,
.lstat = local_lstat,
.readlink = local_readlink,
.close = local_close,
.opendir = local_opendir,
.rewinddir = local_rewinddir,
.telldir = local_telldir,
- .readdir_r = local_readdir_r,
+ .readdir = local_readdir,
.seekdir = local_seekdir,
.preadv = local_preadv,
.pwritev = local_pwritev,
projects / qemu.git / blobdiff