diff options
author | 2016-05-18 13:18:31 +0300 | |
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committer | 2016-05-18 13:42:15 +0300 | |
commit | 437fd90c0250dee670290f9b714253671a990160 (patch) | |
tree | b871786c360704244a07411c69fb58da9ead4a06 /qemu/hw/9pfs/9p-handle.c | |
parent | 5bbd6fe9b8bab2a93e548c5a53b032d1939eec05 (diff) |
These changes are the raw update to qemu-2.6.
Collission happened in the following patches:
migration: do cleanup operation after completion(738df5b9)
Bug fix.(1750c932f86)
kvmclock: add a new function to update env->tsc.(b52baab2)
The code provided by the patches was already in the upstreamed
version.
Change-Id: I3cc11841a6a76ae20887b2e245710199e1ea7f9a
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'qemu/hw/9pfs/9p-handle.c')
-rw-r--r-- | qemu/hw/9pfs/9p-handle.c | 709 |
1 files changed, 709 insertions, 0 deletions
diff --git a/qemu/hw/9pfs/9p-handle.c b/qemu/hw/9pfs/9p-handle.c new file mode 100644 index 000000000..894041488 --- /dev/null +++ b/qemu/hw/9pfs/9p-handle.c @@ -0,0 +1,709 @@ +/* + * 9p handle callback + * + * Copyright IBM, Corp. 2011 + * + * Authors: + * Aneesh Kumar K.V <aneesh.kumar@linux.vnet.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 "qemu/osdep.h" +#include "9p.h" +#include "9p-xattr.h" +#include <arpa/inet.h> +#include <pwd.h> +#include <grp.h> +#include <sys/socket.h> +#include <sys/un.h> +#include "qemu/xattr.h" +#include "qemu/cutils.h" +#include "qemu/error-report.h" +#include <linux/fs.h> +#ifdef CONFIG_LINUX_MAGIC_H +#include <linux/magic.h> +#endif +#include <sys/ioctl.h> + +#ifndef XFS_SUPER_MAGIC +#define XFS_SUPER_MAGIC 0x58465342 +#endif +#ifndef EXT2_SUPER_MAGIC +#define EXT2_SUPER_MAGIC 0xEF53 +#endif +#ifndef REISERFS_SUPER_MAGIC +#define REISERFS_SUPER_MAGIC 0x52654973 +#endif +#ifndef BTRFS_SUPER_MAGIC +#define BTRFS_SUPER_MAGIC 0x9123683E +#endif + +struct handle_data { + int mountfd; + int handle_bytes; +}; + +static inline int name_to_handle(int dirfd, const char *name, + struct file_handle *fh, int *mnt_id, int flags) +{ + return name_to_handle_at(dirfd, name, fh, mnt_id, flags); +} + +static inline int open_by_handle(int mountfd, const char *fh, int flags) +{ + return open_by_handle_at(mountfd, (struct file_handle *)fh, flags); +} + +static int handle_update_file_cred(int dirfd, const char *name, FsCred *credp) +{ + int fd, ret; + fd = openat(dirfd, name, O_NONBLOCK | O_NOFOLLOW); + if (fd < 0) { + return fd; + } + ret = fchownat(fd, "", credp->fc_uid, credp->fc_gid, AT_EMPTY_PATH); + if (ret < 0) { + goto err_out; + } + ret = fchmod(fd, credp->fc_mode & 07777); +err_out: + close(fd); + return ret; +} + + +static int handle_lstat(FsContext *fs_ctx, V9fsPath *fs_path, + struct stat *stbuf) +{ + int fd, ret; + struct handle_data *data = (struct handle_data *)fs_ctx->private; + + fd = open_by_handle(data->mountfd, fs_path->data, O_PATH); + if (fd < 0) { + return fd; + } + ret = fstatat(fd, "", stbuf, AT_EMPTY_PATH); + close(fd); + return ret; +} + +static ssize_t handle_readlink(FsContext *fs_ctx, V9fsPath *fs_path, + char *buf, size_t bufsz) +{ + int fd, ret; + struct handle_data *data = (struct handle_data *)fs_ctx->private; + + fd = open_by_handle(data->mountfd, fs_path->data, O_PATH); + if (fd < 0) { + return fd; + } + ret = readlinkat(fd, "", buf, bufsz); + close(fd); + return ret; +} + +static int handle_close(FsContext *ctx, V9fsFidOpenState *fs) +{ + return close(fs->fd); +} + +static int handle_closedir(FsContext *ctx, V9fsFidOpenState *fs) +{ + return closedir(fs->dir); +} + +static int handle_open(FsContext *ctx, V9fsPath *fs_path, + int flags, V9fsFidOpenState *fs) +{ + struct handle_data *data = (struct handle_data *)ctx->private; + + fs->fd = open_by_handle(data->mountfd, fs_path->data, flags); + return fs->fd; +} + +static int handle_opendir(FsContext *ctx, + V9fsPath *fs_path, V9fsFidOpenState *fs) +{ + int ret; + ret = handle_open(ctx, fs_path, O_DIRECTORY, fs); + if (ret < 0) { + return -1; + } + fs->dir = fdopendir(ret); + if (!fs->dir) { + return -1; + } + return 0; +} + +static void handle_rewinddir(FsContext *ctx, V9fsFidOpenState *fs) +{ + rewinddir(fs->dir); +} + +static off_t handle_telldir(FsContext *ctx, V9fsFidOpenState *fs) +{ + return telldir(fs->dir); +} + +static int handle_readdir_r(FsContext *ctx, V9fsFidOpenState *fs, + struct dirent *entry, + struct dirent **result) +{ + return readdir_r(fs->dir, entry, result); +} + +static void handle_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off) +{ + seekdir(fs->dir, off); +} + +static ssize_t handle_preadv(FsContext *ctx, V9fsFidOpenState *fs, + const struct iovec *iov, + int iovcnt, off_t offset) +{ +#ifdef CONFIG_PREADV + return preadv(fs->fd, iov, iovcnt, offset); +#else + int err = lseek(fs->fd, offset, SEEK_SET); + if (err == -1) { + return err; + } else { + return readv(fs->fd, iov, iovcnt); + } +#endif +} + +static ssize_t handle_pwritev(FsContext *ctx, V9fsFidOpenState *fs, + const struct iovec *iov, + int iovcnt, off_t offset) +{ + ssize_t ret; +#ifdef CONFIG_PREADV + ret = pwritev(fs->fd, iov, iovcnt, offset); +#else + int err = lseek(fs->fd, offset, SEEK_SET); + if (err == -1) { + return err; + } else { + ret = writev(fs->fd, iov, iovcnt); + } +#endif +#ifdef CONFIG_SYNC_FILE_RANGE + if (ret > 0 && ctx->export_flags & V9FS_IMMEDIATE_WRITEOUT) { + /* + * Initiate a writeback. This is not a data integrity sync. + * We want to ensure that we don't leave dirty pages in the cache + * after write when writeout=immediate is sepcified. + */ + sync_file_range(fs->fd, offset, ret, + SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE); + } +#endif + return ret; +} + +static int handle_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp) +{ + int fd, ret; + struct handle_data *data = (struct handle_data *)fs_ctx->private; + + fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK); + if (fd < 0) { + return fd; + } + ret = fchmod(fd, credp->fc_mode); + close(fd); + return ret; +} + +static int handle_mknod(FsContext *fs_ctx, V9fsPath *dir_path, + const char *name, FsCred *credp) +{ + int dirfd, ret; + struct handle_data *data = (struct handle_data *)fs_ctx->private; + + dirfd = open_by_handle(data->mountfd, dir_path->data, O_PATH); + if (dirfd < 0) { + return dirfd; + } + ret = mknodat(dirfd, name, credp->fc_mode, credp->fc_rdev); + if (!ret) { + ret = handle_update_file_cred(dirfd, name, credp); + } + close(dirfd); + return ret; +} + +static int handle_mkdir(FsContext *fs_ctx, V9fsPath *dir_path, + const char *name, FsCred *credp) +{ + int dirfd, ret; + struct handle_data *data = (struct handle_data *)fs_ctx->private; + + dirfd = open_by_handle(data->mountfd, dir_path->data, O_PATH); + if (dirfd < 0) { + return dirfd; + } + ret = mkdirat(dirfd, name, credp->fc_mode); + if (!ret) { + ret = handle_update_file_cred(dirfd, name, credp); + } + close(dirfd); + return ret; +} + +static int handle_fstat(FsContext *fs_ctx, int fid_type, + V9fsFidOpenState *fs, struct stat *stbuf) +{ + int fd; + + if (fid_type == P9_FID_DIR) { + fd = dirfd(fs->dir); + } else { + fd = fs->fd; + } + return fstat(fd, stbuf); +} + +static int handle_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name, + int flags, FsCred *credp, V9fsFidOpenState *fs) +{ + int ret; + int dirfd, fd; + struct handle_data *data = (struct handle_data *)fs_ctx->private; + + dirfd = open_by_handle(data->mountfd, dir_path->data, O_PATH); + if (dirfd < 0) { + return dirfd; + } + fd = openat(dirfd, name, flags | O_NOFOLLOW, credp->fc_mode); + if (fd >= 0) { + ret = handle_update_file_cred(dirfd, name, credp); + if (ret < 0) { + close(fd); + fd = ret; + } else { + fs->fd = fd; + } + } + close(dirfd); + return fd; +} + + +static int handle_symlink(FsContext *fs_ctx, const char *oldpath, + V9fsPath *dir_path, const char *name, FsCred *credp) +{ + int fd, dirfd, ret; + struct handle_data *data = (struct handle_data *)fs_ctx->private; + + dirfd = open_by_handle(data->mountfd, dir_path->data, O_PATH); + if (dirfd < 0) { + return dirfd; + } + ret = symlinkat(oldpath, dirfd, name); + if (!ret) { + fd = openat(dirfd, name, O_PATH | O_NOFOLLOW); + if (fd < 0) { + ret = fd; + goto err_out; + } + ret = fchownat(fd, "", credp->fc_uid, credp->fc_gid, AT_EMPTY_PATH); + close(fd); + } +err_out: + close(dirfd); + return ret; +} + +static int handle_link(FsContext *ctx, V9fsPath *oldpath, + V9fsPath *dirpath, const char *name) +{ + int oldfd, newdirfd, ret; + struct handle_data *data = (struct handle_data *)ctx->private; + + oldfd = open_by_handle(data->mountfd, oldpath->data, O_PATH); + if (oldfd < 0) { + return oldfd; + } + newdirfd = open_by_handle(data->mountfd, dirpath->data, O_PATH); + if (newdirfd < 0) { + close(oldfd); + return newdirfd; + } + ret = linkat(oldfd, "", newdirfd, name, AT_EMPTY_PATH); + close(newdirfd); + close(oldfd); + return ret; +} + +static int handle_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size) +{ + int fd, ret; + struct handle_data *data = (struct handle_data *)ctx->private; + + fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK | O_WRONLY); + if (fd < 0) { + return fd; + } + ret = ftruncate(fd, size); + close(fd); + return ret; +} + +static int handle_rename(FsContext *ctx, const char *oldpath, + const char *newpath) +{ + errno = EOPNOTSUPP; + return -1; +} + +static int handle_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp) +{ + int fd, ret; + struct handle_data *data = (struct handle_data *)fs_ctx->private; + + fd = open_by_handle(data->mountfd, fs_path->data, O_PATH); + if (fd < 0) { + return fd; + } + ret = fchownat(fd, "", credp->fc_uid, credp->fc_gid, AT_EMPTY_PATH); + close(fd); + return ret; +} + +static int handle_utimensat(FsContext *ctx, V9fsPath *fs_path, + const struct timespec *buf) +{ + int ret; +#ifdef CONFIG_UTIMENSAT + int fd; + struct handle_data *data = (struct handle_data *)ctx->private; + + fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK); + if (fd < 0) { + return fd; + } + ret = futimens(fd, buf); + close(fd); +#else + ret = -1; + errno = ENOSYS; +#endif + return ret; +} + +static int handle_remove(FsContext *ctx, const char *path) +{ + errno = EOPNOTSUPP; + return -1; +} + +static int handle_fsync(FsContext *ctx, int fid_type, + V9fsFidOpenState *fs, int datasync) +{ + int fd; + + if (fid_type == P9_FID_DIR) { + fd = dirfd(fs->dir); + } else { + fd = fs->fd; + } + + if (datasync) { + return qemu_fdatasync(fd); + } else { + return fsync(fd); + } +} + +static int handle_statfs(FsContext *ctx, V9fsPath *fs_path, + struct statfs *stbuf) +{ + int fd, ret; + struct handle_data *data = (struct handle_data *)ctx->private; + + fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK); + if (fd < 0) { + return fd; + } + ret = fstatfs(fd, stbuf); + close(fd); + return ret; +} + +static ssize_t handle_lgetxattr(FsContext *ctx, V9fsPath *fs_path, + const char *name, void *value, size_t size) +{ + int fd, ret; + struct handle_data *data = (struct handle_data *)ctx->private; + + fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK); + if (fd < 0) { + return fd; + } + ret = fgetxattr(fd, name, value, size); + close(fd); + return ret; +} + +static ssize_t handle_llistxattr(FsContext *ctx, V9fsPath *fs_path, + void *value, size_t size) +{ + int fd, ret; + struct handle_data *data = (struct handle_data *)ctx->private; + + fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK); + if (fd < 0) { + return fd; + } + ret = flistxattr(fd, value, size); + close(fd); + return ret; +} + +static int handle_lsetxattr(FsContext *ctx, V9fsPath *fs_path, const char *name, + void *value, size_t size, int flags) +{ + int fd, ret; + struct handle_data *data = (struct handle_data *)ctx->private; + + fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK); + if (fd < 0) { + return fd; + } + ret = fsetxattr(fd, name, value, size, flags); + close(fd); + return ret; +} + +static int handle_lremovexattr(FsContext *ctx, V9fsPath *fs_path, + const char *name) +{ + int fd, ret; + struct handle_data *data = (struct handle_data *)ctx->private; + + fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK); + if (fd < 0) { + return fd; + } + ret = fremovexattr(fd, name); + close(fd); + return ret; +} + +static int handle_name_to_path(FsContext *ctx, V9fsPath *dir_path, + const char *name, V9fsPath *target) +{ + char *buffer; + struct file_handle *fh; + int dirfd, ret, mnt_id; + struct handle_data *data = (struct handle_data *)ctx->private; + + /* "." and ".." are not allowed */ + if (!strcmp(name, ".") || !strcmp(name, "..")) { + errno = EINVAL; + return -1; + + } + if (dir_path) { + dirfd = open_by_handle(data->mountfd, dir_path->data, O_PATH); + } else { + /* relative to export root */ + buffer = rpath(ctx, "."); + dirfd = open(buffer, O_DIRECTORY); + g_free(buffer); + } + if (dirfd < 0) { + return dirfd; + } + fh = g_malloc(sizeof(struct file_handle) + data->handle_bytes); + fh->handle_bytes = data->handle_bytes; + /* add a "./" at the beginning of the path */ + buffer = g_strdup_printf("./%s", name); + /* flag = 0 imply don't follow symlink */ + ret = name_to_handle(dirfd, buffer, fh, &mnt_id, 0); + if (!ret) { + target->data = (char *)fh; + target->size = sizeof(struct file_handle) + data->handle_bytes; + } else { + g_free(fh); + } + close(dirfd); + g_free(buffer); + return ret; +} + +static int handle_renameat(FsContext *ctx, V9fsPath *olddir, + const char *old_name, V9fsPath *newdir, + const char *new_name) +{ + int olddirfd, newdirfd, ret; + struct handle_data *data = (struct handle_data *)ctx->private; + + olddirfd = open_by_handle(data->mountfd, olddir->data, O_PATH); + if (olddirfd < 0) { + return olddirfd; + } + newdirfd = open_by_handle(data->mountfd, newdir->data, O_PATH); + if (newdirfd < 0) { + close(olddirfd); + return newdirfd; + } + ret = renameat(olddirfd, old_name, newdirfd, new_name); + close(newdirfd); + close(olddirfd); + return ret; +} + +static int handle_unlinkat(FsContext *ctx, V9fsPath *dir, + const char *name, int flags) +{ + int dirfd, ret; + struct handle_data *data = (struct handle_data *)ctx->private; + int rflags; + + dirfd = open_by_handle(data->mountfd, dir->data, O_PATH); + if (dirfd < 0) { + return dirfd; + } + + rflags = 0; + if (flags & P9_DOTL_AT_REMOVEDIR) { + rflags |= AT_REMOVEDIR; + } + + ret = unlinkat(dirfd, name, rflags); + + close(dirfd); + return ret; +} + +static int handle_ioc_getversion(FsContext *ctx, V9fsPath *path, + mode_t st_mode, uint64_t *st_gen) +{ +#ifdef FS_IOC_GETVERSION + int err; + V9fsFidOpenState fid_open; + + /* + * Do not try to open special files like device nodes, fifos etc + * We can get fd for regular files and directories only + */ + if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) { + errno = ENOTTY; + return -1; + } + err = handle_open(ctx, path, O_RDONLY, &fid_open); + if (err < 0) { + return err; + } + err = ioctl(fid_open.fd, FS_IOC_GETVERSION, st_gen); + handle_close(ctx, &fid_open); + return err; +#else + errno = ENOTTY; + return -1; +#endif +} + +static int handle_init(FsContext *ctx) +{ + int ret, mnt_id; + struct statfs stbuf; + struct file_handle fh; + struct handle_data *data = g_malloc(sizeof(struct handle_data)); + + data->mountfd = open(ctx->fs_root, O_DIRECTORY); + if (data->mountfd < 0) { + ret = data->mountfd; + goto err_out; + } + ret = statfs(ctx->fs_root, &stbuf); + if (!ret) { + 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 = handle_ioc_getversion; + break; + } + } + memset(&fh, 0, sizeof(struct file_handle)); + ret = name_to_handle(data->mountfd, ".", &fh, &mnt_id, 0); + if (ret && errno == EOVERFLOW) { + data->handle_bytes = fh.handle_bytes; + ctx->private = data; + ret = 0; + goto out; + } + /* we got 0 byte handle ? */ + ret = -1; + close(data->mountfd); +err_out: + g_free(data); +out: + return ret; +} + +static int handle_parse_opts(QemuOpts *opts, struct FsDriverEntry *fse) +{ + const char *sec_model = qemu_opt_get(opts, "security_model"); + const char *path = qemu_opt_get(opts, "path"); + + if (sec_model) { + error_report("Invalid argument security_model specified with handle fsdriver"); + return -1; + } + + if (!path) { + error_report("fsdev: No path specified"); + return -1; + } + fse->path = g_strdup(path); + return 0; + +} + +FileOperations handle_ops = { + .parse_opts = handle_parse_opts, + .init = handle_init, + .lstat = handle_lstat, + .readlink = handle_readlink, + .close = handle_close, + .closedir = handle_closedir, + .open = handle_open, + .opendir = handle_opendir, + .rewinddir = handle_rewinddir, + .telldir = handle_telldir, + .readdir_r = handle_readdir_r, + .seekdir = handle_seekdir, + .preadv = handle_preadv, + .pwritev = handle_pwritev, + .chmod = handle_chmod, + .mknod = handle_mknod, + .mkdir = handle_mkdir, + .fstat = handle_fstat, + .open2 = handle_open2, + .symlink = handle_symlink, + .link = handle_link, + .truncate = handle_truncate, + .rename = handle_rename, + .chown = handle_chown, + .utimensat = handle_utimensat, + .remove = handle_remove, + .fsync = handle_fsync, + .statfs = handle_statfs, + .lgetxattr = handle_lgetxattr, + .llistxattr = handle_llistxattr, + .lsetxattr = handle_lsetxattr, + .lremovexattr = handle_lremovexattr, + .name_to_path = handle_name_to_path, + .renameat = handle_renameat, + .unlinkat = handle_unlinkat, +}; 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