Anthony Liguori | 9f10751 | 2010-04-29 17:44:44 +0530 | [diff] [blame] | 1 | /* |
Wei Liu | f00d4f5 | 2015-11-18 18:05:29 +0000 | [diff] [blame] | 2 | * 9p Posix callback |
Anthony Liguori | 9f10751 | 2010-04-29 17:44:44 +0530 | [diff] [blame] | 3 | * |
| 4 | * Copyright IBM, Corp. 2010 |
| 5 | * |
| 6 | * Authors: |
| 7 | * Anthony Liguori <aliguori@us.ibm.com> |
| 8 | * |
| 9 | * This work is licensed under the terms of the GNU GPL, version 2. See |
| 10 | * the COPYING file in the top-level directory. |
| 11 | * |
| 12 | */ |
Stefan Weil | 873c321 | 2011-06-01 12:35:14 +0530 | [diff] [blame] | 13 | |
Peter Maydell | fbc0412 | 2016-01-26 18:17:10 +0000 | [diff] [blame] | 14 | #include "qemu/osdep.h" |
Wei Liu | ebe74f8 | 2016-01-07 18:18:02 +0000 | [diff] [blame] | 15 | #include "9p.h" |
Greg Kurz | 996a0d7 | 2017-02-26 23:42:18 +0100 | [diff] [blame] | 16 | #include "9p-local.h" |
Wei Liu | 267ae09 | 2015-11-18 18:31:52 +0000 | [diff] [blame] | 17 | #include "9p-xattr.h" |
Greg Kurz | 0e35a37 | 2017-02-26 23:42:10 +0100 | [diff] [blame] | 18 | #include "9p-util.h" |
Stefan Weil | 69b1521 | 2014-05-02 22:22:32 +0200 | [diff] [blame] | 19 | #include "fsdev/qemu-fsdev.h" /* local_ops */ |
Anthony Liguori | c494dd6 | 2010-04-29 17:44:59 +0530 | [diff] [blame] | 20 | #include <arpa/inet.h> |
Anthony Liguori | 131dcb2 | 2010-04-29 17:44:47 +0530 | [diff] [blame] | 21 | #include <pwd.h> |
| 22 | #include <grp.h> |
Anthony Liguori | c494dd6 | 2010-04-29 17:44:59 +0530 | [diff] [blame] | 23 | #include <sys/socket.h> |
| 24 | #include <sys/un.h> |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 25 | #include "qemu/xattr.h" |
Veronia Bahaa | f348b6d | 2016-03-20 19:16:19 +0200 | [diff] [blame] | 26 | #include "qemu/cutils.h" |
Greg Kurz | 63325b1 | 2016-01-22 15:12:17 +0100 | [diff] [blame] | 27 | #include "qemu/error-report.h" |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 28 | #include <libgen.h> |
Harsh Prateek Bora | e06a765 | 2011-10-12 19:11:25 +0530 | [diff] [blame] | 29 | #include <linux/fs.h> |
| 30 | #ifdef CONFIG_LINUX_MAGIC_H |
| 31 | #include <linux/magic.h> |
| 32 | #endif |
| 33 | #include <sys/ioctl.h> |
| 34 | |
| 35 | #ifndef XFS_SUPER_MAGIC |
| 36 | #define XFS_SUPER_MAGIC 0x58465342 |
| 37 | #endif |
| 38 | #ifndef EXT2_SUPER_MAGIC |
| 39 | #define EXT2_SUPER_MAGIC 0xEF53 |
| 40 | #endif |
| 41 | #ifndef REISERFS_SUPER_MAGIC |
| 42 | #define REISERFS_SUPER_MAGIC 0x52654973 |
| 43 | #endif |
| 44 | #ifndef BTRFS_SUPER_MAGIC |
| 45 | #define BTRFS_SUPER_MAGIC 0x9123683E |
| 46 | #endif |
Anthony Liguori | 131dcb2 | 2010-04-29 17:44:47 +0530 | [diff] [blame] | 47 | |
Greg Kurz | 0e35a37 | 2017-02-26 23:42:10 +0100 | [diff] [blame] | 48 | typedef struct { |
| 49 | int mountfd; |
| 50 | } LocalData; |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 51 | |
Greg Kurz | 996a0d7 | 2017-02-26 23:42:18 +0100 | [diff] [blame] | 52 | int local_open_nofollow(FsContext *fs_ctx, const char *path, int flags, |
| 53 | mode_t mode) |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 54 | { |
Greg Kurz | 996a0d7 | 2017-02-26 23:42:18 +0100 | [diff] [blame] | 55 | LocalData *data = fs_ctx->private; |
Greg Kurz | 3dbcf27 | 2017-05-25 10:30:14 +0200 | [diff] [blame] | 56 | int fd = data->mountfd; |
Greg Kurz | 996a0d7 | 2017-02-26 23:42:18 +0100 | [diff] [blame] | 57 | |
Greg Kurz | 3dbcf27 | 2017-05-25 10:30:14 +0200 | [diff] [blame] | 58 | while (*path && fd != -1) { |
| 59 | const char *c; |
| 60 | int next_fd; |
| 61 | char *head; |
| 62 | |
| 63 | /* Only relative paths without consecutive slashes */ |
| 64 | assert(*path != '/'); |
| 65 | |
| 66 | head = g_strdup(path); |
| 67 | c = strchrnul(path, '/'); |
| 68 | if (*c) { |
| 69 | /* Intermediate path element */ |
| 70 | head[c - path] = 0; |
| 71 | path = c + 1; |
| 72 | next_fd = openat_dir(fd, head); |
| 73 | } else { |
| 74 | /* Rightmost path element */ |
| 75 | next_fd = openat_file(fd, head, flags, mode); |
| 76 | path = c; |
| 77 | } |
| 78 | g_free(head); |
| 79 | if (fd != data->mountfd) { |
| 80 | close_preserve_errno(fd); |
| 81 | } |
| 82 | fd = next_fd; |
Michael Tokarev | 1b6f85e | 2015-03-12 09:52:30 +0300 | [diff] [blame] | 83 | } |
Greg Kurz | 996a0d7 | 2017-02-26 23:42:18 +0100 | [diff] [blame] | 84 | |
Greg Kurz | 3dbcf27 | 2017-05-25 10:30:14 +0200 | [diff] [blame] | 85 | assert(fd != data->mountfd); |
| 86 | return fd; |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 87 | } |
| 88 | |
Greg Kurz | 996a0d7 | 2017-02-26 23:42:18 +0100 | [diff] [blame] | 89 | int local_opendir_nofollow(FsContext *fs_ctx, const char *path) |
| 90 | { |
| 91 | return local_open_nofollow(fs_ctx, path, O_DIRECTORY | O_RDONLY, 0); |
| 92 | } |
| 93 | |
Greg Kurz | 99f2cf4 | 2017-02-26 23:43:55 +0100 | [diff] [blame] | 94 | static void renameat_preserve_errno(int odirfd, const char *opath, int ndirfd, |
| 95 | const char *npath) |
| 96 | { |
| 97 | int serrno = errno; |
| 98 | renameat(odirfd, opath, ndirfd, npath); |
| 99 | errno = serrno; |
| 100 | } |
| 101 | |
Greg Kurz | ad0b46e | 2017-02-26 23:44:20 +0100 | [diff] [blame] | 102 | static void unlinkat_preserve_errno(int dirfd, const char *path, int flags) |
| 103 | { |
| 104 | int serrno = errno; |
| 105 | unlinkat(dirfd, path, flags); |
| 106 | errno = serrno; |
| 107 | } |
| 108 | |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 109 | #define VIRTFS_META_DIR ".virtfs_metadata" |
Greg Kurz | 81ffbf5 | 2017-05-25 10:30:14 +0200 | [diff] [blame] | 110 | #define VIRTFS_META_ROOT_FILE VIRTFS_META_DIR "_root" |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 111 | |
Greg Kurz | f9aef99 | 2017-02-26 23:43:48 +0100 | [diff] [blame] | 112 | static FILE *local_fopenat(int dirfd, const char *name, const char *mode) |
Aneesh Kumar K.V | 0ceb092 | 2013-05-20 19:43:15 +0530 | [diff] [blame] | 113 | { |
| 114 | int fd, o_mode = 0; |
| 115 | FILE *fp; |
Greg Kurz | f9aef99 | 2017-02-26 23:43:48 +0100 | [diff] [blame] | 116 | int flags; |
Aneesh Kumar K.V | 0ceb092 | 2013-05-20 19:43:15 +0530 | [diff] [blame] | 117 | /* |
| 118 | * only supports two modes |
| 119 | */ |
| 120 | if (mode[0] == 'r') { |
Greg Kurz | f9aef99 | 2017-02-26 23:43:48 +0100 | [diff] [blame] | 121 | flags = O_RDONLY; |
Aneesh Kumar K.V | 0ceb092 | 2013-05-20 19:43:15 +0530 | [diff] [blame] | 122 | } else if (mode[0] == 'w') { |
Greg Kurz | f9aef99 | 2017-02-26 23:43:48 +0100 | [diff] [blame] | 123 | flags = O_WRONLY | O_TRUNC | O_CREAT; |
Aneesh Kumar K.V | 0ceb092 | 2013-05-20 19:43:15 +0530 | [diff] [blame] | 124 | o_mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH; |
| 125 | } else { |
| 126 | return NULL; |
| 127 | } |
Greg Kurz | f9aef99 | 2017-02-26 23:43:48 +0100 | [diff] [blame] | 128 | fd = openat_file(dirfd, name, flags, o_mode); |
Aneesh Kumar K.V | 0ceb092 | 2013-05-20 19:43:15 +0530 | [diff] [blame] | 129 | if (fd == -1) { |
| 130 | return NULL; |
| 131 | } |
| 132 | fp = fdopen(fd, mode); |
| 133 | if (!fp) { |
| 134 | close(fd); |
| 135 | } |
| 136 | return fp; |
| 137 | } |
| 138 | |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 139 | #define ATTR_MAX 100 |
Greg Kurz | f9aef99 | 2017-02-26 23:43:48 +0100 | [diff] [blame] | 140 | static void local_mapped_file_attr(int dirfd, const char *name, |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 141 | struct stat *stbuf) |
| 142 | { |
| 143 | FILE *fp; |
| 144 | char buf[ATTR_MAX]; |
Greg Kurz | f9aef99 | 2017-02-26 23:43:48 +0100 | [diff] [blame] | 145 | int map_dirfd; |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 146 | |
Greg Kurz | 81ffbf5 | 2017-05-25 10:30:14 +0200 | [diff] [blame] | 147 | if (strcmp(name, ".")) { |
| 148 | map_dirfd = openat_dir(dirfd, VIRTFS_META_DIR); |
| 149 | if (map_dirfd == -1) { |
| 150 | return; |
| 151 | } |
Greg Kurz | f9aef99 | 2017-02-26 23:43:48 +0100 | [diff] [blame] | 152 | |
Greg Kurz | 81ffbf5 | 2017-05-25 10:30:14 +0200 | [diff] [blame] | 153 | fp = local_fopenat(map_dirfd, name, "r"); |
| 154 | close_preserve_errno(map_dirfd); |
| 155 | } else { |
| 156 | fp = local_fopenat(dirfd, VIRTFS_META_ROOT_FILE, "r"); |
| 157 | } |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 158 | if (!fp) { |
| 159 | return; |
| 160 | } |
| 161 | memset(buf, 0, ATTR_MAX); |
| 162 | while (fgets(buf, ATTR_MAX, fp)) { |
| 163 | if (!strncmp(buf, "virtfs.uid", 10)) { |
| 164 | stbuf->st_uid = atoi(buf+11); |
| 165 | } else if (!strncmp(buf, "virtfs.gid", 10)) { |
| 166 | stbuf->st_gid = atoi(buf+11); |
| 167 | } else if (!strncmp(buf, "virtfs.mode", 11)) { |
| 168 | stbuf->st_mode = atoi(buf+12); |
| 169 | } else if (!strncmp(buf, "virtfs.rdev", 11)) { |
| 170 | stbuf->st_rdev = atoi(buf+12); |
| 171 | } |
| 172 | memset(buf, 0, ATTR_MAX); |
| 173 | } |
| 174 | fclose(fp); |
| 175 | } |
| 176 | |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 177 | static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf) |
Anthony Liguori | 131dcb2 | 2010-04-29 17:44:47 +0530 | [diff] [blame] | 178 | { |
Greg Kurz | f9aef99 | 2017-02-26 23:43:48 +0100 | [diff] [blame] | 179 | int err = -1; |
| 180 | char *dirpath = g_path_get_dirname(fs_path->data); |
| 181 | char *name = g_path_get_basename(fs_path->data); |
| 182 | int dirfd; |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 183 | |
Greg Kurz | f9aef99 | 2017-02-26 23:43:48 +0100 | [diff] [blame] | 184 | dirfd = local_opendir_nofollow(fs_ctx, dirpath); |
| 185 | if (dirfd == -1) { |
| 186 | goto out; |
| 187 | } |
| 188 | |
| 189 | err = fstatat(dirfd, name, stbuf, AT_SYMLINK_NOFOLLOW); |
Venkateswararao Jujjuri (JV) | 1237ad7 | 2010-06-14 13:34:44 -0700 | [diff] [blame] | 190 | if (err) { |
Chen Gang | 4fa4ce7 | 2014-03-02 01:36:19 +0800 | [diff] [blame] | 191 | goto err_out; |
Venkateswararao Jujjuri (JV) | 1237ad7 | 2010-06-14 13:34:44 -0700 | [diff] [blame] | 192 | } |
Aneesh Kumar K.V | b97400c | 2011-10-13 13:21:00 +0530 | [diff] [blame] | 193 | if (fs_ctx->export_flags & V9FS_SM_MAPPED) { |
Venkateswararao Jujjuri (JV) | 1237ad7 | 2010-06-14 13:34:44 -0700 | [diff] [blame] | 194 | /* Actual credentials are part of extended attrs */ |
| 195 | uid_t tmp_uid; |
| 196 | gid_t tmp_gid; |
| 197 | mode_t tmp_mode; |
| 198 | dev_t tmp_dev; |
Greg Kurz | f9aef99 | 2017-02-26 23:43:48 +0100 | [diff] [blame] | 199 | |
| 200 | if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.uid", &tmp_uid, |
| 201 | sizeof(uid_t)) > 0) { |
Aneesh Kumar K.V | f8ad4a8 | 2014-08-03 17:02:55 +0530 | [diff] [blame] | 202 | stbuf->st_uid = le32_to_cpu(tmp_uid); |
Venkateswararao Jujjuri (JV) | 1237ad7 | 2010-06-14 13:34:44 -0700 | [diff] [blame] | 203 | } |
Greg Kurz | f9aef99 | 2017-02-26 23:43:48 +0100 | [diff] [blame] | 204 | if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.gid", &tmp_gid, |
| 205 | sizeof(gid_t)) > 0) { |
Aneesh Kumar K.V | f8ad4a8 | 2014-08-03 17:02:55 +0530 | [diff] [blame] | 206 | stbuf->st_gid = le32_to_cpu(tmp_gid); |
Venkateswararao Jujjuri (JV) | 1237ad7 | 2010-06-14 13:34:44 -0700 | [diff] [blame] | 207 | } |
Greg Kurz | f9aef99 | 2017-02-26 23:43:48 +0100 | [diff] [blame] | 208 | if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.mode", &tmp_mode, |
| 209 | sizeof(mode_t)) > 0) { |
Aneesh Kumar K.V | f8ad4a8 | 2014-08-03 17:02:55 +0530 | [diff] [blame] | 210 | stbuf->st_mode = le32_to_cpu(tmp_mode); |
Venkateswararao Jujjuri (JV) | 1237ad7 | 2010-06-14 13:34:44 -0700 | [diff] [blame] | 211 | } |
Greg Kurz | f9aef99 | 2017-02-26 23:43:48 +0100 | [diff] [blame] | 212 | if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.rdev", &tmp_dev, |
| 213 | sizeof(dev_t)) > 0) { |
Aneesh Kumar K.V | f8ad4a8 | 2014-08-03 17:02:55 +0530 | [diff] [blame] | 214 | stbuf->st_rdev = le64_to_cpu(tmp_dev); |
Venkateswararao Jujjuri (JV) | 1237ad7 | 2010-06-14 13:34:44 -0700 | [diff] [blame] | 215 | } |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 216 | } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
Greg Kurz | f9aef99 | 2017-02-26 23:43:48 +0100 | [diff] [blame] | 217 | local_mapped_file_attr(dirfd, name, stbuf); |
Venkateswararao Jujjuri (JV) | 1237ad7 | 2010-06-14 13:34:44 -0700 | [diff] [blame] | 218 | } |
Chen Gang | 4fa4ce7 | 2014-03-02 01:36:19 +0800 | [diff] [blame] | 219 | |
| 220 | err_out: |
Greg Kurz | f9aef99 | 2017-02-26 23:43:48 +0100 | [diff] [blame] | 221 | close_preserve_errno(dirfd); |
| 222 | out: |
| 223 | g_free(name); |
| 224 | g_free(dirpath); |
Venkateswararao Jujjuri (JV) | 1237ad7 | 2010-06-14 13:34:44 -0700 | [diff] [blame] | 225 | return err; |
Anthony Liguori | 131dcb2 | 2010-04-29 17:44:47 +0530 | [diff] [blame] | 226 | } |
| 227 | |
Greg Kurz | e3187a4 | 2017-02-26 23:44:28 +0100 | [diff] [blame] | 228 | static int local_set_mapped_file_attrat(int dirfd, const char *name, |
| 229 | FsCred *credp) |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 230 | { |
| 231 | FILE *fp; |
Greg Kurz | e3187a4 | 2017-02-26 23:44:28 +0100 | [diff] [blame] | 232 | int ret; |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 233 | char buf[ATTR_MAX]; |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 234 | int uid = -1, gid = -1, mode = -1, rdev = -1; |
Greg Kurz | 81ffbf5 | 2017-05-25 10:30:14 +0200 | [diff] [blame] | 235 | int map_dirfd = -1, map_fd; |
| 236 | bool is_root = !strcmp(name, "."); |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 237 | |
Greg Kurz | 81ffbf5 | 2017-05-25 10:30:14 +0200 | [diff] [blame] | 238 | if (is_root) { |
| 239 | fp = local_fopenat(dirfd, VIRTFS_META_ROOT_FILE, "r"); |
| 240 | if (!fp) { |
| 241 | if (errno == ENOENT) { |
| 242 | goto update_map_file; |
| 243 | } else { |
| 244 | return -1; |
| 245 | } |
| 246 | } |
| 247 | } else { |
| 248 | ret = mkdirat(dirfd, VIRTFS_META_DIR, 0700); |
| 249 | if (ret < 0 && errno != EEXIST) { |
Greg Kurz | e3187a4 | 2017-02-26 23:44:28 +0100 | [diff] [blame] | 250 | return -1; |
| 251 | } |
Greg Kurz | 81ffbf5 | 2017-05-25 10:30:14 +0200 | [diff] [blame] | 252 | |
| 253 | map_dirfd = openat_dir(dirfd, VIRTFS_META_DIR); |
| 254 | if (map_dirfd == -1) { |
| 255 | return -1; |
| 256 | } |
| 257 | |
| 258 | fp = local_fopenat(map_dirfd, name, "r"); |
| 259 | if (!fp) { |
| 260 | if (errno == ENOENT) { |
| 261 | goto update_map_file; |
| 262 | } else { |
| 263 | close_preserve_errno(map_dirfd); |
| 264 | return -1; |
| 265 | } |
| 266 | } |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 267 | } |
| 268 | memset(buf, 0, ATTR_MAX); |
| 269 | while (fgets(buf, ATTR_MAX, fp)) { |
| 270 | if (!strncmp(buf, "virtfs.uid", 10)) { |
Greg Kurz | e3187a4 | 2017-02-26 23:44:28 +0100 | [diff] [blame] | 271 | uid = atoi(buf + 11); |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 272 | } else if (!strncmp(buf, "virtfs.gid", 10)) { |
Greg Kurz | e3187a4 | 2017-02-26 23:44:28 +0100 | [diff] [blame] | 273 | gid = atoi(buf + 11); |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 274 | } else if (!strncmp(buf, "virtfs.mode", 11)) { |
Greg Kurz | e3187a4 | 2017-02-26 23:44:28 +0100 | [diff] [blame] | 275 | mode = atoi(buf + 12); |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 276 | } else if (!strncmp(buf, "virtfs.rdev", 11)) { |
Greg Kurz | e3187a4 | 2017-02-26 23:44:28 +0100 | [diff] [blame] | 277 | rdev = atoi(buf + 12); |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 278 | } |
| 279 | memset(buf, 0, ATTR_MAX); |
| 280 | } |
| 281 | fclose(fp); |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 282 | |
| 283 | update_map_file: |
Greg Kurz | 81ffbf5 | 2017-05-25 10:30:14 +0200 | [diff] [blame] | 284 | if (is_root) { |
| 285 | fp = local_fopenat(dirfd, VIRTFS_META_ROOT_FILE, "w"); |
| 286 | } else { |
| 287 | fp = local_fopenat(map_dirfd, name, "w"); |
| 288 | /* We can't go this far with map_dirfd not being a valid file descriptor |
| 289 | * but some versions of gcc aren't smart enough to see it. |
| 290 | */ |
| 291 | if (map_dirfd != -1) { |
| 292 | close_preserve_errno(map_dirfd); |
| 293 | } |
| 294 | } |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 295 | if (!fp) { |
Greg Kurz | e3187a4 | 2017-02-26 23:44:28 +0100 | [diff] [blame] | 296 | return -1; |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 297 | } |
| 298 | |
Greg Kurz | 81ffbf5 | 2017-05-25 10:30:14 +0200 | [diff] [blame] | 299 | map_fd = fileno(fp); |
| 300 | assert(map_fd != -1); |
| 301 | ret = fchmod(map_fd, 0600); |
| 302 | assert(ret == 0); |
| 303 | |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 304 | if (credp->fc_uid != -1) { |
| 305 | uid = credp->fc_uid; |
| 306 | } |
| 307 | if (credp->fc_gid != -1) { |
| 308 | gid = credp->fc_gid; |
| 309 | } |
| 310 | if (credp->fc_mode != -1) { |
| 311 | mode = credp->fc_mode; |
| 312 | } |
| 313 | if (credp->fc_rdev != -1) { |
| 314 | rdev = credp->fc_rdev; |
| 315 | } |
| 316 | |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 317 | if (uid != -1) { |
| 318 | fprintf(fp, "virtfs.uid=%d\n", uid); |
| 319 | } |
| 320 | if (gid != -1) { |
| 321 | fprintf(fp, "virtfs.gid=%d\n", gid); |
| 322 | } |
| 323 | if (mode != -1) { |
| 324 | fprintf(fp, "virtfs.mode=%d\n", mode); |
| 325 | } |
| 326 | if (rdev != -1) { |
| 327 | fprintf(fp, "virtfs.rdev=%d\n", rdev); |
| 328 | } |
| 329 | fclose(fp); |
| 330 | |
Greg Kurz | e3187a4 | 2017-02-26 23:44:28 +0100 | [diff] [blame] | 331 | return 0; |
| 332 | } |
| 333 | |
| 334 | static int fchmodat_nofollow(int dirfd, const char *name, mode_t mode) |
| 335 | { |
| 336 | int fd, ret; |
| 337 | |
| 338 | /* FIXME: this should be handled with fchmodat(AT_SYMLINK_NOFOLLOW). |
| 339 | * Unfortunately, the linux kernel doesn't implement it yet. As an |
| 340 | * alternative, let's open the file and use fchmod() instead. This |
| 341 | * may fail depending on the permissions of the file, but it is the |
| 342 | * best we can do to avoid TOCTTOU. We first try to open read-only |
| 343 | * in case name points to a directory. If that fails, we try write-only |
| 344 | * in case name doesn't point to a directory. |
| 345 | */ |
| 346 | fd = openat_file(dirfd, name, O_RDONLY, 0); |
| 347 | if (fd == -1) { |
| 348 | /* In case the file is writable-only and isn't a directory. */ |
| 349 | if (errno == EACCES) { |
| 350 | fd = openat_file(dirfd, name, O_WRONLY, 0); |
| 351 | } |
| 352 | if (fd == -1 && errno == EISDIR) { |
| 353 | errno = EACCES; |
| 354 | } |
| 355 | } |
| 356 | if (fd == -1) { |
| 357 | return -1; |
| 358 | } |
| 359 | ret = fchmod(fd, mode); |
| 360 | close_preserve_errno(fd); |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 361 | return ret; |
| 362 | } |
| 363 | |
Greg Kurz | e3187a4 | 2017-02-26 23:44:28 +0100 | [diff] [blame] | 364 | static int local_set_xattrat(int dirfd, const char *path, FsCred *credp) |
Anthony Liguori | 131dcb2 | 2010-04-29 17:44:47 +0530 | [diff] [blame] | 365 | { |
Venkateswararao Jujjuri (JV) | 758e8e3 | 2010-06-14 13:34:41 -0700 | [diff] [blame] | 366 | int err; |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 367 | |
Venkateswararao Jujjuri (JV) | 758e8e3 | 2010-06-14 13:34:41 -0700 | [diff] [blame] | 368 | if (credp->fc_uid != -1) { |
Aneesh Kumar K.V | f8ad4a8 | 2014-08-03 17:02:55 +0530 | [diff] [blame] | 369 | uint32_t tmp_uid = cpu_to_le32(credp->fc_uid); |
Greg Kurz | e3187a4 | 2017-02-26 23:44:28 +0100 | [diff] [blame] | 370 | err = fsetxattrat_nofollow(dirfd, path, "user.virtfs.uid", &tmp_uid, |
| 371 | sizeof(uid_t), 0); |
Venkateswararao Jujjuri (JV) | 758e8e3 | 2010-06-14 13:34:41 -0700 | [diff] [blame] | 372 | if (err) { |
| 373 | return err; |
| 374 | } |
Anthony Liguori | 131dcb2 | 2010-04-29 17:44:47 +0530 | [diff] [blame] | 375 | } |
Venkateswararao Jujjuri (JV) | 758e8e3 | 2010-06-14 13:34:41 -0700 | [diff] [blame] | 376 | if (credp->fc_gid != -1) { |
Aneesh Kumar K.V | f8ad4a8 | 2014-08-03 17:02:55 +0530 | [diff] [blame] | 377 | uint32_t tmp_gid = cpu_to_le32(credp->fc_gid); |
Greg Kurz | e3187a4 | 2017-02-26 23:44:28 +0100 | [diff] [blame] | 378 | err = fsetxattrat_nofollow(dirfd, path, "user.virtfs.gid", &tmp_gid, |
| 379 | sizeof(gid_t), 0); |
Venkateswararao Jujjuri (JV) | 758e8e3 | 2010-06-14 13:34:41 -0700 | [diff] [blame] | 380 | if (err) { |
| 381 | return err; |
| 382 | } |
Anthony Liguori | 131dcb2 | 2010-04-29 17:44:47 +0530 | [diff] [blame] | 383 | } |
Venkateswararao Jujjuri (JV) | 758e8e3 | 2010-06-14 13:34:41 -0700 | [diff] [blame] | 384 | if (credp->fc_mode != -1) { |
Aneesh Kumar K.V | f8ad4a8 | 2014-08-03 17:02:55 +0530 | [diff] [blame] | 385 | uint32_t tmp_mode = cpu_to_le32(credp->fc_mode); |
Greg Kurz | e3187a4 | 2017-02-26 23:44:28 +0100 | [diff] [blame] | 386 | err = fsetxattrat_nofollow(dirfd, path, "user.virtfs.mode", &tmp_mode, |
| 387 | sizeof(mode_t), 0); |
Venkateswararao Jujjuri (JV) | 758e8e3 | 2010-06-14 13:34:41 -0700 | [diff] [blame] | 388 | if (err) { |
| 389 | return err; |
| 390 | } |
Anthony Liguori | 131dcb2 | 2010-04-29 17:44:47 +0530 | [diff] [blame] | 391 | } |
Venkateswararao Jujjuri (JV) | 758e8e3 | 2010-06-14 13:34:41 -0700 | [diff] [blame] | 392 | if (credp->fc_rdev != -1) { |
Aneesh Kumar K.V | f8ad4a8 | 2014-08-03 17:02:55 +0530 | [diff] [blame] | 393 | uint64_t tmp_rdev = cpu_to_le64(credp->fc_rdev); |
Greg Kurz | e3187a4 | 2017-02-26 23:44:28 +0100 | [diff] [blame] | 394 | err = fsetxattrat_nofollow(dirfd, path, "user.virtfs.rdev", &tmp_rdev, |
| 395 | sizeof(dev_t), 0); |
Venkateswararao Jujjuri (JV) | 758e8e3 | 2010-06-14 13:34:41 -0700 | [diff] [blame] | 396 | if (err) { |
| 397 | return err; |
| 398 | } |
Anthony Liguori | 131dcb2 | 2010-04-29 17:44:47 +0530 | [diff] [blame] | 399 | } |
Anthony Liguori | 131dcb2 | 2010-04-29 17:44:47 +0530 | [diff] [blame] | 400 | return 0; |
| 401 | } |
| 402 | |
Greg Kurz | d815e72 | 2017-02-26 23:44:54 +0100 | [diff] [blame] | 403 | static int local_set_cred_passthrough(FsContext *fs_ctx, int dirfd, |
| 404 | const char *name, FsCred *credp) |
Venkateswararao Jujjuri (JV) | 4750a96 | 2010-06-14 13:34:45 -0700 | [diff] [blame] | 405 | { |
Greg Kurz | d815e72 | 2017-02-26 23:44:54 +0100 | [diff] [blame] | 406 | if (fchownat(dirfd, name, credp->fc_uid, credp->fc_gid, |
Greg Kurz | b314f6a | 2017-03-06 17:34:01 +0100 | [diff] [blame] | 407 | AT_SYMLINK_NOFOLLOW) < 0) { |
Aneesh Kumar K.V | 12848bf | 2010-09-02 11:09:07 +0530 | [diff] [blame] | 408 | /* |
| 409 | * If we fail to change ownership and if we are |
| 410 | * using security model none. Ignore the error |
| 411 | */ |
Aneesh Kumar K.V | b97400c | 2011-10-13 13:21:00 +0530 | [diff] [blame] | 412 | if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) { |
Greg Kurz | d815e72 | 2017-02-26 23:44:54 +0100 | [diff] [blame] | 413 | return -1; |
Aneesh Kumar K.V | 12848bf | 2010-09-02 11:09:07 +0530 | [diff] [blame] | 414 | } |
Venkateswararao Jujjuri (JV) | 4750a96 | 2010-06-14 13:34:45 -0700 | [diff] [blame] | 415 | } |
M. Mohan Kumar | 2d40564 | 2012-01-19 12:21:12 +0530 | [diff] [blame] | 416 | |
Greg Kurz | d815e72 | 2017-02-26 23:44:54 +0100 | [diff] [blame] | 417 | return fchmodat_nofollow(dirfd, name, credp->fc_mode & 07777); |
Venkateswararao Jujjuri (JV) | 4750a96 | 2010-06-14 13:34:45 -0700 | [diff] [blame] | 418 | } |
| 419 | |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 420 | static ssize_t local_readlink(FsContext *fs_ctx, V9fsPath *fs_path, |
| 421 | char *buf, size_t bufsz) |
Anthony Liguori | 131dcb2 | 2010-04-29 17:44:47 +0530 | [diff] [blame] | 422 | { |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 423 | ssize_t tsize = -1; |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 424 | |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 425 | if ((fs_ctx->export_flags & V9FS_SM_MAPPED) || |
| 426 | (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE)) { |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 427 | int fd; |
Greg Kurz | bec1e95 | 2017-02-26 23:43:40 +0100 | [diff] [blame] | 428 | |
| 429 | fd = local_open_nofollow(fs_ctx, fs_path->data, O_RDONLY, 0); |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 430 | if (fd == -1) { |
| 431 | return -1; |
| 432 | } |
| 433 | do { |
| 434 | tsize = read(fd, (void *)buf, bufsz); |
| 435 | } while (tsize == -1 && errno == EINTR); |
Greg Kurz | bec1e95 | 2017-02-26 23:43:40 +0100 | [diff] [blame] | 436 | close_preserve_errno(fd); |
Aneesh Kumar K.V | b97400c | 2011-10-13 13:21:00 +0530 | [diff] [blame] | 437 | } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || |
| 438 | (fs_ctx->export_flags & V9FS_SM_NONE)) { |
Greg Kurz | bec1e95 | 2017-02-26 23:43:40 +0100 | [diff] [blame] | 439 | char *dirpath = g_path_get_dirname(fs_path->data); |
| 440 | char *name = g_path_get_basename(fs_path->data); |
| 441 | int dirfd; |
| 442 | |
| 443 | dirfd = local_opendir_nofollow(fs_ctx, dirpath); |
| 444 | if (dirfd == -1) { |
| 445 | goto out; |
| 446 | } |
| 447 | |
| 448 | tsize = readlinkat(dirfd, name, buf, bufsz); |
| 449 | close_preserve_errno(dirfd); |
| 450 | out: |
| 451 | g_free(name); |
| 452 | g_free(dirpath); |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 453 | } |
| 454 | return tsize; |
Anthony Liguori | 131dcb2 | 2010-04-29 17:44:47 +0530 | [diff] [blame] | 455 | } |
| 456 | |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 457 | static int local_close(FsContext *ctx, V9fsFidOpenState *fs) |
Anthony Liguori | 131dcb2 | 2010-04-29 17:44:47 +0530 | [diff] [blame] | 458 | { |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 459 | return close(fs->fd); |
Anthony Liguori | 131dcb2 | 2010-04-29 17:44:47 +0530 | [diff] [blame] | 460 | } |
| 461 | |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 462 | static int local_closedir(FsContext *ctx, V9fsFidOpenState *fs) |
Anthony Liguori | 131dcb2 | 2010-04-29 17:44:47 +0530 | [diff] [blame] | 463 | { |
Greg Kurz | f314ea4 | 2016-06-06 11:52:34 +0200 | [diff] [blame] | 464 | return closedir(fs->dir.stream); |
Anthony Liguori | 131dcb2 | 2010-04-29 17:44:47 +0530 | [diff] [blame] | 465 | } |
Anthony Liguori | 9f10751 | 2010-04-29 17:44:44 +0530 | [diff] [blame] | 466 | |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 467 | static int local_open(FsContext *ctx, V9fsPath *fs_path, |
| 468 | int flags, V9fsFidOpenState *fs) |
Anthony Liguori | a6568fe | 2010-04-29 17:44:55 +0530 | [diff] [blame] | 469 | { |
Greg Kurz | 21328e1 | 2017-02-26 23:41:55 +0100 | [diff] [blame] | 470 | int fd; |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 471 | |
Greg Kurz | 996a0d7 | 2017-02-26 23:42:18 +0100 | [diff] [blame] | 472 | fd = local_open_nofollow(ctx, fs_path->data, flags, 0); |
Greg Kurz | 21328e1 | 2017-02-26 23:41:55 +0100 | [diff] [blame] | 473 | if (fd == -1) { |
| 474 | return -1; |
| 475 | } |
| 476 | fs->fd = fd; |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 477 | return fs->fd; |
Anthony Liguori | a6568fe | 2010-04-29 17:44:55 +0530 | [diff] [blame] | 478 | } |
| 479 | |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 480 | static int local_opendir(FsContext *ctx, |
| 481 | V9fsPath *fs_path, V9fsFidOpenState *fs) |
Anthony Liguori | a6568fe | 2010-04-29 17:44:55 +0530 | [diff] [blame] | 482 | { |
Greg Kurz | 996a0d7 | 2017-02-26 23:42:18 +0100 | [diff] [blame] | 483 | int dirfd; |
Greg Kurz | 21328e1 | 2017-02-26 23:41:55 +0100 | [diff] [blame] | 484 | DIR *stream; |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 485 | |
Greg Kurz | 996a0d7 | 2017-02-26 23:42:18 +0100 | [diff] [blame] | 486 | dirfd = local_opendir_nofollow(ctx, fs_path->data); |
| 487 | if (dirfd == -1) { |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 488 | return -1; |
| 489 | } |
Greg Kurz | 996a0d7 | 2017-02-26 23:42:18 +0100 | [diff] [blame] | 490 | |
| 491 | stream = fdopendir(dirfd); |
Greg Kurz | 21328e1 | 2017-02-26 23:41:55 +0100 | [diff] [blame] | 492 | if (!stream) { |
Greg Kurz | faab207 | 2017-03-06 17:34:01 +0100 | [diff] [blame] | 493 | close(dirfd); |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 494 | return -1; |
| 495 | } |
Greg Kurz | 21328e1 | 2017-02-26 23:41:55 +0100 | [diff] [blame] | 496 | fs->dir.stream = stream; |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 497 | return 0; |
Anthony Liguori | a6568fe | 2010-04-29 17:44:55 +0530 | [diff] [blame] | 498 | } |
| 499 | |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 500 | static void local_rewinddir(FsContext *ctx, V9fsFidOpenState *fs) |
Anthony Liguori | a923155 | 2010-04-29 17:44:56 +0530 | [diff] [blame] | 501 | { |
Greg Kurz | f314ea4 | 2016-06-06 11:52:34 +0200 | [diff] [blame] | 502 | rewinddir(fs->dir.stream); |
Anthony Liguori | a923155 | 2010-04-29 17:44:56 +0530 | [diff] [blame] | 503 | } |
| 504 | |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 505 | static off_t local_telldir(FsContext *ctx, V9fsFidOpenState *fs) |
Anthony Liguori | a923155 | 2010-04-29 17:44:56 +0530 | [diff] [blame] | 506 | { |
Greg Kurz | f314ea4 | 2016-06-06 11:52:34 +0200 | [diff] [blame] | 507 | return telldir(fs->dir.stream); |
Anthony Liguori | a923155 | 2010-04-29 17:44:56 +0530 | [diff] [blame] | 508 | } |
| 509 | |
Greg Kurz | 7a95434 | 2017-05-05 14:48:08 +0200 | [diff] [blame] | 510 | static bool local_is_mapped_file_metadata(FsContext *fs_ctx, const char *name) |
| 511 | { |
Greg Kurz | 81ffbf5 | 2017-05-25 10:30:14 +0200 | [diff] [blame] | 512 | return |
| 513 | !strcmp(name, VIRTFS_META_DIR) || !strcmp(name, VIRTFS_META_ROOT_FILE); |
Greg Kurz | 7a95434 | 2017-05-05 14:48:08 +0200 | [diff] [blame] | 514 | } |
| 515 | |
Greg Kurz | 635324e | 2016-06-06 11:52:34 +0200 | [diff] [blame] | 516 | static struct dirent *local_readdir(FsContext *ctx, V9fsFidOpenState *fs) |
Anthony Liguori | a923155 | 2010-04-29 17:44:56 +0530 | [diff] [blame] | 517 | { |
Greg Kurz | 635324e | 2016-06-06 11:52:34 +0200 | [diff] [blame] | 518 | struct dirent *entry; |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 519 | |
| 520 | again: |
Greg Kurz | 635324e | 2016-06-06 11:52:34 +0200 | [diff] [blame] | 521 | entry = readdir(fs->dir.stream); |
| 522 | if (!entry) { |
| 523 | return NULL; |
| 524 | } |
| 525 | |
Bastian Blank | 840a1bf | 2014-08-22 13:22:21 +0400 | [diff] [blame] | 526 | if (ctx->export_flags & V9FS_SM_MAPPED) { |
| 527 | entry->d_type = DT_UNKNOWN; |
| 528 | } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
Greg Kurz | 7a95434 | 2017-05-05 14:48:08 +0200 | [diff] [blame] | 529 | if (local_is_mapped_file_metadata(ctx, entry->d_name)) { |
Greg Kurz | 81ffbf5 | 2017-05-25 10:30:14 +0200 | [diff] [blame] | 530 | /* skip the meta data */ |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 531 | goto again; |
| 532 | } |
Bastian Blank | 840a1bf | 2014-08-22 13:22:21 +0400 | [diff] [blame] | 533 | entry->d_type = DT_UNKNOWN; |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 534 | } |
Greg Kurz | 635324e | 2016-06-06 11:52:34 +0200 | [diff] [blame] | 535 | |
| 536 | return entry; |
Anthony Liguori | a923155 | 2010-04-29 17:44:56 +0530 | [diff] [blame] | 537 | } |
| 538 | |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 539 | static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off) |
Anthony Liguori | a923155 | 2010-04-29 17:44:56 +0530 | [diff] [blame] | 540 | { |
Greg Kurz | f314ea4 | 2016-06-06 11:52:34 +0200 | [diff] [blame] | 541 | seekdir(fs->dir.stream, off); |
Anthony Liguori | a923155 | 2010-04-29 17:44:56 +0530 | [diff] [blame] | 542 | } |
| 543 | |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 544 | static ssize_t local_preadv(FsContext *ctx, V9fsFidOpenState *fs, |
| 545 | const struct iovec *iov, |
Sanchit Garg | 56d15a5 | 2010-10-08 11:30:16 +0530 | [diff] [blame] | 546 | int iovcnt, off_t offset) |
Anthony Liguori | a923155 | 2010-04-29 17:44:56 +0530 | [diff] [blame] | 547 | { |
Sanchit Garg | 56d15a5 | 2010-10-08 11:30:16 +0530 | [diff] [blame] | 548 | #ifdef CONFIG_PREADV |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 549 | return preadv(fs->fd, iov, iovcnt, offset); |
Sanchit Garg | 56d15a5 | 2010-10-08 11:30:16 +0530 | [diff] [blame] | 550 | #else |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 551 | int err = lseek(fs->fd, offset, SEEK_SET); |
Sanchit Garg | 56d15a5 | 2010-10-08 11:30:16 +0530 | [diff] [blame] | 552 | if (err == -1) { |
| 553 | return err; |
| 554 | } else { |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 555 | return readv(fs->fd, iov, iovcnt); |
Sanchit Garg | 56d15a5 | 2010-10-08 11:30:16 +0530 | [diff] [blame] | 556 | } |
| 557 | #endif |
Anthony Liguori | a923155 | 2010-04-29 17:44:56 +0530 | [diff] [blame] | 558 | } |
| 559 | |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 560 | static ssize_t local_pwritev(FsContext *ctx, V9fsFidOpenState *fs, |
| 561 | const struct iovec *iov, |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 562 | int iovcnt, off_t offset) |
Anthony Liguori | a923155 | 2010-04-29 17:44:56 +0530 | [diff] [blame] | 563 | { |
Greg Kurz | 6fe76ac | 2017-01-23 09:46:13 +0100 | [diff] [blame] | 564 | ssize_t ret; |
Sanchit Garg | 56d15a5 | 2010-10-08 11:30:16 +0530 | [diff] [blame] | 565 | #ifdef CONFIG_PREADV |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 566 | ret = pwritev(fs->fd, iov, iovcnt, offset); |
Sanchit Garg | 56d15a5 | 2010-10-08 11:30:16 +0530 | [diff] [blame] | 567 | #else |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 568 | int err = lseek(fs->fd, offset, SEEK_SET); |
Sanchit Garg | 56d15a5 | 2010-10-08 11:30:16 +0530 | [diff] [blame] | 569 | if (err == -1) { |
| 570 | return err; |
| 571 | } else { |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 572 | ret = writev(fs->fd, iov, iovcnt); |
Sanchit Garg | 56d15a5 | 2010-10-08 11:30:16 +0530 | [diff] [blame] | 573 | } |
| 574 | #endif |
Aneesh Kumar K.V | d3ab98e | 2011-10-12 19:11:23 +0530 | [diff] [blame] | 575 | #ifdef CONFIG_SYNC_FILE_RANGE |
| 576 | if (ret > 0 && ctx->export_flags & V9FS_IMMEDIATE_WRITEOUT) { |
| 577 | /* |
| 578 | * Initiate a writeback. This is not a data integrity sync. |
| 579 | * We want to ensure that we don't leave dirty pages in the cache |
| 580 | * after write when writeout=immediate is sepcified. |
| 581 | */ |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 582 | sync_file_range(fs->fd, offset, ret, |
Aneesh Kumar K.V | d3ab98e | 2011-10-12 19:11:23 +0530 | [diff] [blame] | 583 | SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE); |
| 584 | } |
| 585 | #endif |
| 586 | return ret; |
Anthony Liguori | 8449360 | 2010-04-29 17:44:58 +0530 | [diff] [blame] | 587 | } |
| 588 | |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 589 | static int local_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp) |
Anthony Liguori | c494dd6 | 2010-04-29 17:44:59 +0530 | [diff] [blame] | 590 | { |
Greg Kurz | e3187a4 | 2017-02-26 23:44:28 +0100 | [diff] [blame] | 591 | char *dirpath = g_path_get_dirname(fs_path->data); |
| 592 | char *name = g_path_get_basename(fs_path->data); |
Chen Gang | 4fa4ce7 | 2014-03-02 01:36:19 +0800 | [diff] [blame] | 593 | int ret = -1; |
Greg Kurz | e3187a4 | 2017-02-26 23:44:28 +0100 | [diff] [blame] | 594 | int dirfd; |
| 595 | |
| 596 | dirfd = local_opendir_nofollow(fs_ctx, dirpath); |
| 597 | if (dirfd == -1) { |
| 598 | goto out; |
| 599 | } |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 600 | |
Aneesh Kumar K.V | b97400c | 2011-10-13 13:21:00 +0530 | [diff] [blame] | 601 | if (fs_ctx->export_flags & V9FS_SM_MAPPED) { |
Greg Kurz | e3187a4 | 2017-02-26 23:44:28 +0100 | [diff] [blame] | 602 | ret = local_set_xattrat(dirfd, name, credp); |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 603 | } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
Greg Kurz | e3187a4 | 2017-02-26 23:44:28 +0100 | [diff] [blame] | 604 | ret = local_set_mapped_file_attrat(dirfd, name, credp); |
| 605 | } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH || |
| 606 | fs_ctx->export_flags & V9FS_SM_NONE) { |
| 607 | ret = fchmodat_nofollow(dirfd, name, credp->fc_mode); |
Venkateswararao Jujjuri (JV) | e95ead3 | 2010-06-14 13:34:42 -0700 | [diff] [blame] | 608 | } |
Greg Kurz | e3187a4 | 2017-02-26 23:44:28 +0100 | [diff] [blame] | 609 | close_preserve_errno(dirfd); |
| 610 | |
| 611 | out: |
| 612 | g_free(dirpath); |
| 613 | g_free(name); |
Chen Gang | 4fa4ce7 | 2014-03-02 01:36:19 +0800 | [diff] [blame] | 614 | return ret; |
Anthony Liguori | c494dd6 | 2010-04-29 17:44:59 +0530 | [diff] [blame] | 615 | } |
| 616 | |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 617 | static int local_mknod(FsContext *fs_ctx, V9fsPath *dir_path, |
| 618 | const char *name, FsCred *credp) |
Anthony Liguori | c494dd6 | 2010-04-29 17:44:59 +0530 | [diff] [blame] | 619 | { |
Venkateswararao Jujjuri (JV) | 1c29331 | 2010-06-14 13:34:48 -0700 | [diff] [blame] | 620 | int err = -1; |
Greg Kurz | d815e72 | 2017-02-26 23:44:54 +0100 | [diff] [blame] | 621 | int dirfd; |
Venkateswararao Jujjuri (JV) | 1c29331 | 2010-06-14 13:34:48 -0700 | [diff] [blame] | 622 | |
Greg Kurz | 7a95434 | 2017-05-05 14:48:08 +0200 | [diff] [blame] | 623 | if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE && |
| 624 | local_is_mapped_file_metadata(fs_ctx, name)) { |
| 625 | errno = EINVAL; |
| 626 | return -1; |
| 627 | } |
| 628 | |
Greg Kurz | d815e72 | 2017-02-26 23:44:54 +0100 | [diff] [blame] | 629 | dirfd = local_opendir_nofollow(fs_ctx, dir_path->data); |
| 630 | if (dirfd == -1) { |
| 631 | return -1; |
| 632 | } |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 633 | |
Greg Kurz | d815e72 | 2017-02-26 23:44:54 +0100 | [diff] [blame] | 634 | if (fs_ctx->export_flags & V9FS_SM_MAPPED || |
| 635 | fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
Tobias Schramm | b96feb2 | 2017-06-29 15:11:50 +0200 | [diff] [blame] | 636 | err = mknodat(dirfd, name, fs_ctx->fmode | S_IFREG, 0); |
Venkateswararao Jujjuri (JV) | 1c29331 | 2010-06-14 13:34:48 -0700 | [diff] [blame] | 637 | if (err == -1) { |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 638 | goto out; |
Venkateswararao Jujjuri (JV) | 1c29331 | 2010-06-14 13:34:48 -0700 | [diff] [blame] | 639 | } |
Greg Kurz | d815e72 | 2017-02-26 23:44:54 +0100 | [diff] [blame] | 640 | |
| 641 | if (fs_ctx->export_flags & V9FS_SM_MAPPED) { |
| 642 | err = local_set_xattrat(dirfd, name, credp); |
| 643 | } else { |
| 644 | err = local_set_mapped_file_attrat(dirfd, name, credp); |
| 645 | } |
Venkateswararao Jujjuri (JV) | 1c29331 | 2010-06-14 13:34:48 -0700 | [diff] [blame] | 646 | if (err == -1) { |
Venkateswararao Jujjuri (JV) | 1c29331 | 2010-06-14 13:34:48 -0700 | [diff] [blame] | 647 | goto err_end; |
| 648 | } |
Greg Kurz | d815e72 | 2017-02-26 23:44:54 +0100 | [diff] [blame] | 649 | } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH || |
| 650 | fs_ctx->export_flags & V9FS_SM_NONE) { |
| 651 | err = mknodat(dirfd, name, credp->fc_mode, credp->fc_rdev); |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 652 | if (err == -1) { |
| 653 | goto out; |
| 654 | } |
Greg Kurz | d815e72 | 2017-02-26 23:44:54 +0100 | [diff] [blame] | 655 | err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp); |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 656 | if (err == -1) { |
Venkateswararao Jujjuri (JV) | 1c29331 | 2010-06-14 13:34:48 -0700 | [diff] [blame] | 657 | goto err_end; |
| 658 | } |
| 659 | } |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 660 | goto out; |
Venkateswararao Jujjuri (JV) | 1c29331 | 2010-06-14 13:34:48 -0700 | [diff] [blame] | 661 | |
| 662 | err_end: |
Greg Kurz | d815e72 | 2017-02-26 23:44:54 +0100 | [diff] [blame] | 663 | unlinkat_preserve_errno(dirfd, name, 0); |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 664 | out: |
Greg Kurz | d815e72 | 2017-02-26 23:44:54 +0100 | [diff] [blame] | 665 | close_preserve_errno(dirfd); |
Venkateswararao Jujjuri (JV) | 1c29331 | 2010-06-14 13:34:48 -0700 | [diff] [blame] | 666 | return err; |
Anthony Liguori | c494dd6 | 2010-04-29 17:44:59 +0530 | [diff] [blame] | 667 | } |
| 668 | |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 669 | static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path, |
| 670 | const char *name, FsCred *credp) |
Anthony Liguori | c494dd6 | 2010-04-29 17:44:59 +0530 | [diff] [blame] | 671 | { |
Venkateswararao Jujjuri (JV) | 00ec5c3 | 2010-06-14 13:34:46 -0700 | [diff] [blame] | 672 | int err = -1; |
Greg Kurz | 3f3a169 | 2017-02-26 23:45:02 +0100 | [diff] [blame] | 673 | int dirfd; |
Venkateswararao Jujjuri (JV) | 00ec5c3 | 2010-06-14 13:34:46 -0700 | [diff] [blame] | 674 | |
Greg Kurz | 7a95434 | 2017-05-05 14:48:08 +0200 | [diff] [blame] | 675 | if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE && |
| 676 | local_is_mapped_file_metadata(fs_ctx, name)) { |
| 677 | errno = EINVAL; |
| 678 | return -1; |
| 679 | } |
| 680 | |
Greg Kurz | 3f3a169 | 2017-02-26 23:45:02 +0100 | [diff] [blame] | 681 | dirfd = local_opendir_nofollow(fs_ctx, dir_path->data); |
| 682 | if (dirfd == -1) { |
| 683 | return -1; |
| 684 | } |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 685 | |
Greg Kurz | 3f3a169 | 2017-02-26 23:45:02 +0100 | [diff] [blame] | 686 | if (fs_ctx->export_flags & V9FS_SM_MAPPED || |
| 687 | fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
Tobias Schramm | b96feb2 | 2017-06-29 15:11:50 +0200 | [diff] [blame] | 688 | err = mkdirat(dirfd, name, fs_ctx->dmode); |
Venkateswararao Jujjuri (JV) | 00ec5c3 | 2010-06-14 13:34:46 -0700 | [diff] [blame] | 689 | if (err == -1) { |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 690 | goto out; |
Venkateswararao Jujjuri (JV) | 00ec5c3 | 2010-06-14 13:34:46 -0700 | [diff] [blame] | 691 | } |
Greg Kurz | 3f3a169 | 2017-02-26 23:45:02 +0100 | [diff] [blame] | 692 | credp->fc_mode = credp->fc_mode | S_IFDIR; |
| 693 | |
| 694 | if (fs_ctx->export_flags & V9FS_SM_MAPPED) { |
| 695 | err = local_set_xattrat(dirfd, name, credp); |
| 696 | } else { |
| 697 | err = local_set_mapped_file_attrat(dirfd, name, credp); |
| 698 | } |
Venkateswararao Jujjuri (JV) | 00ec5c3 | 2010-06-14 13:34:46 -0700 | [diff] [blame] | 699 | if (err == -1) { |
Venkateswararao Jujjuri (JV) | 00ec5c3 | 2010-06-14 13:34:46 -0700 | [diff] [blame] | 700 | goto err_end; |
| 701 | } |
Greg Kurz | 3f3a169 | 2017-02-26 23:45:02 +0100 | [diff] [blame] | 702 | } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH || |
| 703 | fs_ctx->export_flags & V9FS_SM_NONE) { |
| 704 | err = mkdirat(dirfd, name, credp->fc_mode); |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 705 | if (err == -1) { |
| 706 | goto out; |
| 707 | } |
Greg Kurz | 3f3a169 | 2017-02-26 23:45:02 +0100 | [diff] [blame] | 708 | err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp); |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 709 | if (err == -1) { |
Venkateswararao Jujjuri (JV) | 00ec5c3 | 2010-06-14 13:34:46 -0700 | [diff] [blame] | 710 | goto err_end; |
| 711 | } |
| 712 | } |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 713 | goto out; |
Venkateswararao Jujjuri (JV) | 00ec5c3 | 2010-06-14 13:34:46 -0700 | [diff] [blame] | 714 | |
| 715 | err_end: |
Greg Kurz | 3f3a169 | 2017-02-26 23:45:02 +0100 | [diff] [blame] | 716 | unlinkat_preserve_errno(dirfd, name, AT_REMOVEDIR); |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 717 | out: |
Greg Kurz | 3f3a169 | 2017-02-26 23:45:02 +0100 | [diff] [blame] | 718 | close_preserve_errno(dirfd); |
Venkateswararao Jujjuri (JV) | 00ec5c3 | 2010-06-14 13:34:46 -0700 | [diff] [blame] | 719 | return err; |
Anthony Liguori | c494dd6 | 2010-04-29 17:44:59 +0530 | [diff] [blame] | 720 | } |
| 721 | |
Aneesh Kumar K.V | 8b88827 | 2011-12-04 22:35:28 +0530 | [diff] [blame] | 722 | static int local_fstat(FsContext *fs_ctx, int fid_type, |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 723 | V9fsFidOpenState *fs, struct stat *stbuf) |
Anthony Liguori | c494dd6 | 2010-04-29 17:44:59 +0530 | [diff] [blame] | 724 | { |
Aneesh Kumar K.V | 8b88827 | 2011-12-04 22:35:28 +0530 | [diff] [blame] | 725 | int err, fd; |
| 726 | |
| 727 | if (fid_type == P9_FID_DIR) { |
Greg Kurz | f314ea4 | 2016-06-06 11:52:34 +0200 | [diff] [blame] | 728 | fd = dirfd(fs->dir.stream); |
Aneesh Kumar K.V | 8b88827 | 2011-12-04 22:35:28 +0530 | [diff] [blame] | 729 | } else { |
| 730 | fd = fs->fd; |
| 731 | } |
| 732 | |
| 733 | err = fstat(fd, stbuf); |
Venkateswararao Jujjuri (JV) | 1237ad7 | 2010-06-14 13:34:44 -0700 | [diff] [blame] | 734 | if (err) { |
| 735 | return err; |
| 736 | } |
Aneesh Kumar K.V | b97400c | 2011-10-13 13:21:00 +0530 | [diff] [blame] | 737 | if (fs_ctx->export_flags & V9FS_SM_MAPPED) { |
Venkateswararao Jujjuri (JV) | 1237ad7 | 2010-06-14 13:34:44 -0700 | [diff] [blame] | 738 | /* Actual credentials are part of extended attrs */ |
| 739 | uid_t tmp_uid; |
| 740 | gid_t tmp_gid; |
| 741 | mode_t tmp_mode; |
| 742 | dev_t tmp_dev; |
| 743 | |
Aneesh Kumar K.V | f8ad4a8 | 2014-08-03 17:02:55 +0530 | [diff] [blame] | 744 | if (fgetxattr(fd, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) { |
| 745 | stbuf->st_uid = le32_to_cpu(tmp_uid); |
Venkateswararao Jujjuri (JV) | 1237ad7 | 2010-06-14 13:34:44 -0700 | [diff] [blame] | 746 | } |
Aneesh Kumar K.V | f8ad4a8 | 2014-08-03 17:02:55 +0530 | [diff] [blame] | 747 | if (fgetxattr(fd, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) { |
| 748 | stbuf->st_gid = le32_to_cpu(tmp_gid); |
Venkateswararao Jujjuri (JV) | 1237ad7 | 2010-06-14 13:34:44 -0700 | [diff] [blame] | 749 | } |
Aneesh Kumar K.V | f8ad4a8 | 2014-08-03 17:02:55 +0530 | [diff] [blame] | 750 | if (fgetxattr(fd, "user.virtfs.mode", &tmp_mode, sizeof(mode_t)) > 0) { |
| 751 | stbuf->st_mode = le32_to_cpu(tmp_mode); |
Venkateswararao Jujjuri (JV) | 1237ad7 | 2010-06-14 13:34:44 -0700 | [diff] [blame] | 752 | } |
Aneesh Kumar K.V | f8ad4a8 | 2014-08-03 17:02:55 +0530 | [diff] [blame] | 753 | if (fgetxattr(fd, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) { |
| 754 | stbuf->st_rdev = le64_to_cpu(tmp_dev); |
Venkateswararao Jujjuri (JV) | 1237ad7 | 2010-06-14 13:34:44 -0700 | [diff] [blame] | 755 | } |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 756 | } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| 757 | errno = EOPNOTSUPP; |
| 758 | return -1; |
Venkateswararao Jujjuri (JV) | 1237ad7 | 2010-06-14 13:34:44 -0700 | [diff] [blame] | 759 | } |
| 760 | return err; |
Anthony Liguori | c494dd6 | 2010-04-29 17:44:59 +0530 | [diff] [blame] | 761 | } |
| 762 | |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 763 | static int local_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name, |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 764 | int flags, FsCred *credp, V9fsFidOpenState *fs) |
Anthony Liguori | c494dd6 | 2010-04-29 17:44:59 +0530 | [diff] [blame] | 765 | { |
Venkateswararao Jujjuri (JV) | 4750a96 | 2010-06-14 13:34:45 -0700 | [diff] [blame] | 766 | int fd = -1; |
| 767 | int err = -1; |
Greg Kurz | a565fea | 2017-02-26 23:45:09 +0100 | [diff] [blame] | 768 | int dirfd; |
Venkateswararao Jujjuri (JV) | 4750a96 | 2010-06-14 13:34:45 -0700 | [diff] [blame] | 769 | |
Greg Kurz | 7a95434 | 2017-05-05 14:48:08 +0200 | [diff] [blame] | 770 | if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE && |
| 771 | local_is_mapped_file_metadata(fs_ctx, name)) { |
| 772 | errno = EINVAL; |
| 773 | return -1; |
| 774 | } |
| 775 | |
Aneesh Kumar K.V | 0ceb092 | 2013-05-20 19:43:15 +0530 | [diff] [blame] | 776 | /* |
| 777 | * Mark all the open to not follow symlinks |
| 778 | */ |
| 779 | flags |= O_NOFOLLOW; |
| 780 | |
Greg Kurz | a565fea | 2017-02-26 23:45:09 +0100 | [diff] [blame] | 781 | dirfd = local_opendir_nofollow(fs_ctx, dir_path->data); |
| 782 | if (dirfd == -1) { |
| 783 | return -1; |
| 784 | } |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 785 | |
Venkateswararao Jujjuri (JV) | 4750a96 | 2010-06-14 13:34:45 -0700 | [diff] [blame] | 786 | /* Determine the security model */ |
Greg Kurz | a565fea | 2017-02-26 23:45:09 +0100 | [diff] [blame] | 787 | if (fs_ctx->export_flags & V9FS_SM_MAPPED || |
| 788 | fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
Tobias Schramm | b96feb2 | 2017-06-29 15:11:50 +0200 | [diff] [blame] | 789 | fd = openat_file(dirfd, name, flags, fs_ctx->fmode); |
Venkateswararao Jujjuri (JV) | 4750a96 | 2010-06-14 13:34:45 -0700 | [diff] [blame] | 790 | if (fd == -1) { |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 791 | goto out; |
Venkateswararao Jujjuri (JV) | 4750a96 | 2010-06-14 13:34:45 -0700 | [diff] [blame] | 792 | } |
| 793 | credp->fc_mode = credp->fc_mode|S_IFREG; |
Greg Kurz | a565fea | 2017-02-26 23:45:09 +0100 | [diff] [blame] | 794 | if (fs_ctx->export_flags & V9FS_SM_MAPPED) { |
| 795 | /* Set cleint credentials in xattr */ |
| 796 | err = local_set_xattrat(dirfd, name, credp); |
| 797 | } else { |
| 798 | err = local_set_mapped_file_attrat(dirfd, name, credp); |
Venkateswararao Jujjuri (JV) | 4750a96 | 2010-06-14 13:34:45 -0700 | [diff] [blame] | 799 | } |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 800 | if (err == -1) { |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 801 | goto err_end; |
| 802 | } |
Aneesh Kumar K.V | b97400c | 2011-10-13 13:21:00 +0530 | [diff] [blame] | 803 | } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || |
| 804 | (fs_ctx->export_flags & V9FS_SM_NONE)) { |
Greg Kurz | a565fea | 2017-02-26 23:45:09 +0100 | [diff] [blame] | 805 | fd = openat_file(dirfd, name, flags, credp->fc_mode); |
Venkateswararao Jujjuri (JV) | 4750a96 | 2010-06-14 13:34:45 -0700 | [diff] [blame] | 806 | if (fd == -1) { |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 807 | goto out; |
Venkateswararao Jujjuri (JV) | 4750a96 | 2010-06-14 13:34:45 -0700 | [diff] [blame] | 808 | } |
Greg Kurz | a565fea | 2017-02-26 23:45:09 +0100 | [diff] [blame] | 809 | err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp); |
Venkateswararao Jujjuri (JV) | 4750a96 | 2010-06-14 13:34:45 -0700 | [diff] [blame] | 810 | if (err == -1) { |
Venkateswararao Jujjuri (JV) | 4750a96 | 2010-06-14 13:34:45 -0700 | [diff] [blame] | 811 | goto err_end; |
| 812 | } |
| 813 | } |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 814 | err = fd; |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 815 | fs->fd = fd; |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 816 | goto out; |
Venkateswararao Jujjuri (JV) | 4750a96 | 2010-06-14 13:34:45 -0700 | [diff] [blame] | 817 | |
| 818 | err_end: |
Greg Kurz | a565fea | 2017-02-26 23:45:09 +0100 | [diff] [blame] | 819 | unlinkat_preserve_errno(dirfd, name, |
| 820 | flags & O_DIRECTORY ? AT_REMOVEDIR : 0); |
| 821 | close_preserve_errno(fd); |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 822 | out: |
Greg Kurz | a565fea | 2017-02-26 23:45:09 +0100 | [diff] [blame] | 823 | close_preserve_errno(dirfd); |
Venkateswararao Jujjuri (JV) | 4750a96 | 2010-06-14 13:34:45 -0700 | [diff] [blame] | 824 | return err; |
Anthony Liguori | c494dd6 | 2010-04-29 17:44:59 +0530 | [diff] [blame] | 825 | } |
| 826 | |
Venkateswararao Jujjuri (JV) | 758e8e3 | 2010-06-14 13:34:41 -0700 | [diff] [blame] | 827 | |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 828 | static int local_symlink(FsContext *fs_ctx, const char *oldpath, |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 829 | V9fsPath *dir_path, const char *name, FsCred *credp) |
Anthony Liguori | c494dd6 | 2010-04-29 17:44:59 +0530 | [diff] [blame] | 830 | { |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 831 | int err = -1; |
Greg Kurz | 3877161 | 2017-02-26 23:44:46 +0100 | [diff] [blame] | 832 | int dirfd; |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 833 | |
Greg Kurz | 7a95434 | 2017-05-05 14:48:08 +0200 | [diff] [blame] | 834 | if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE && |
| 835 | local_is_mapped_file_metadata(fs_ctx, name)) { |
| 836 | errno = EINVAL; |
| 837 | return -1; |
| 838 | } |
| 839 | |
Greg Kurz | 3877161 | 2017-02-26 23:44:46 +0100 | [diff] [blame] | 840 | dirfd = local_opendir_nofollow(fs_ctx, dir_path->data); |
| 841 | if (dirfd == -1) { |
| 842 | return -1; |
| 843 | } |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 844 | |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 845 | /* Determine the security model */ |
Greg Kurz | 3877161 | 2017-02-26 23:44:46 +0100 | [diff] [blame] | 846 | if (fs_ctx->export_flags & V9FS_SM_MAPPED || |
| 847 | fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 848 | int fd; |
| 849 | ssize_t oldpath_size, write_size; |
Greg Kurz | 3877161 | 2017-02-26 23:44:46 +0100 | [diff] [blame] | 850 | |
| 851 | fd = openat_file(dirfd, name, O_CREAT | O_EXCL | O_RDWR, |
Tobias Schramm | b96feb2 | 2017-06-29 15:11:50 +0200 | [diff] [blame] | 852 | fs_ctx->fmode); |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 853 | if (fd == -1) { |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 854 | goto out; |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 855 | } |
| 856 | /* Write the oldpath (target) to the file. */ |
Harsh Prateek Bora | f35bde2 | 2011-02-02 10:20:33 +0530 | [diff] [blame] | 857 | oldpath_size = strlen(oldpath); |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 858 | do { |
| 859 | write_size = write(fd, (void *)oldpath, oldpath_size); |
| 860 | } while (write_size == -1 && errno == EINTR); |
Greg Kurz | 3877161 | 2017-02-26 23:44:46 +0100 | [diff] [blame] | 861 | close_preserve_errno(fd); |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 862 | |
| 863 | if (write_size != oldpath_size) { |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 864 | goto err_end; |
| 865 | } |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 866 | /* Set cleint credentials in symlink's xattr */ |
Greg Kurz | 3877161 | 2017-02-26 23:44:46 +0100 | [diff] [blame] | 867 | credp->fc_mode = credp->fc_mode | S_IFLNK; |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 868 | |
Greg Kurz | 3877161 | 2017-02-26 23:44:46 +0100 | [diff] [blame] | 869 | if (fs_ctx->export_flags & V9FS_SM_MAPPED) { |
| 870 | err = local_set_xattrat(dirfd, name, credp); |
| 871 | } else { |
| 872 | err = local_set_mapped_file_attrat(dirfd, name, credp); |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 873 | } |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 874 | if (err == -1) { |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 875 | goto err_end; |
| 876 | } |
Greg Kurz | 3877161 | 2017-02-26 23:44:46 +0100 | [diff] [blame] | 877 | } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH || |
| 878 | fs_ctx->export_flags & V9FS_SM_NONE) { |
| 879 | err = symlinkat(oldpath, dirfd, name); |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 880 | if (err) { |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 881 | goto out; |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 882 | } |
Greg Kurz | 3877161 | 2017-02-26 23:44:46 +0100 | [diff] [blame] | 883 | err = fchownat(dirfd, name, credp->fc_uid, credp->fc_gid, |
| 884 | AT_SYMLINK_NOFOLLOW); |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 885 | if (err == -1) { |
Aneesh Kumar K.V | 12848bf | 2010-09-02 11:09:07 +0530 | [diff] [blame] | 886 | /* |
| 887 | * If we fail to change ownership and if we are |
| 888 | * using security model none. Ignore the error |
| 889 | */ |
Aneesh Kumar K.V | b97400c | 2011-10-13 13:21:00 +0530 | [diff] [blame] | 890 | if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) { |
Aneesh Kumar K.V | 12848bf | 2010-09-02 11:09:07 +0530 | [diff] [blame] | 891 | goto err_end; |
Greg Kurz | 3877161 | 2017-02-26 23:44:46 +0100 | [diff] [blame] | 892 | } else { |
Aneesh Kumar K.V | 12848bf | 2010-09-02 11:09:07 +0530 | [diff] [blame] | 893 | err = 0; |
Greg Kurz | 3877161 | 2017-02-26 23:44:46 +0100 | [diff] [blame] | 894 | } |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 895 | } |
| 896 | } |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 897 | goto out; |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 898 | |
| 899 | err_end: |
Greg Kurz | 3877161 | 2017-02-26 23:44:46 +0100 | [diff] [blame] | 900 | unlinkat_preserve_errno(dirfd, name, 0); |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 901 | out: |
Greg Kurz | 3877161 | 2017-02-26 23:44:46 +0100 | [diff] [blame] | 902 | close_preserve_errno(dirfd); |
Venkateswararao Jujjuri (JV) | 879c281 | 2010-06-14 13:34:47 -0700 | [diff] [blame] | 903 | return err; |
Anthony Liguori | c494dd6 | 2010-04-29 17:44:59 +0530 | [diff] [blame] | 904 | } |
| 905 | |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 906 | static int local_link(FsContext *ctx, V9fsPath *oldpath, |
| 907 | V9fsPath *dirpath, const char *name) |
Anthony Liguori | c494dd6 | 2010-04-29 17:44:59 +0530 | [diff] [blame] | 908 | { |
Greg Kurz | ad0b46e | 2017-02-26 23:44:20 +0100 | [diff] [blame] | 909 | char *odirpath = g_path_get_dirname(oldpath->data); |
| 910 | char *oname = g_path_get_basename(oldpath->data); |
| 911 | int ret = -1; |
| 912 | int odirfd, ndirfd; |
Anthony Liguori | c494dd6 | 2010-04-29 17:44:59 +0530 | [diff] [blame] | 913 | |
Greg Kurz | 7a95434 | 2017-05-05 14:48:08 +0200 | [diff] [blame] | 914 | if (ctx->export_flags & V9FS_SM_MAPPED_FILE && |
| 915 | local_is_mapped_file_metadata(ctx, name)) { |
| 916 | errno = EINVAL; |
| 917 | return -1; |
| 918 | } |
| 919 | |
Greg Kurz | ad0b46e | 2017-02-26 23:44:20 +0100 | [diff] [blame] | 920 | odirfd = local_opendir_nofollow(ctx, odirpath); |
| 921 | if (odirfd == -1) { |
Greg Kurz | 6dd4b1f | 2017-02-26 23:44:11 +0100 | [diff] [blame] | 922 | goto out; |
| 923 | } |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 924 | |
Greg Kurz | ad0b46e | 2017-02-26 23:44:20 +0100 | [diff] [blame] | 925 | ndirfd = local_opendir_nofollow(ctx, dirpath->data); |
| 926 | if (ndirfd == -1) { |
| 927 | close_preserve_errno(odirfd); |
| 928 | goto out; |
| 929 | } |
| 930 | |
| 931 | ret = linkat(odirfd, oname, ndirfd, name, 0); |
| 932 | if (ret < 0) { |
| 933 | goto out_close; |
| 934 | } |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 935 | |
| 936 | /* now link the virtfs_metadata files */ |
Greg Kurz | 6dd4b1f | 2017-02-26 23:44:11 +0100 | [diff] [blame] | 937 | if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
Greg Kurz | ad0b46e | 2017-02-26 23:44:20 +0100 | [diff] [blame] | 938 | int omap_dirfd, nmap_dirfd; |
Greg Kurz | 6dd4b1f | 2017-02-26 23:44:11 +0100 | [diff] [blame] | 939 | |
Greg Kurz | ad0b46e | 2017-02-26 23:44:20 +0100 | [diff] [blame] | 940 | ret = mkdirat(ndirfd, VIRTFS_META_DIR, 0700); |
| 941 | if (ret < 0 && errno != EEXIST) { |
| 942 | goto err_undo_link; |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 943 | } |
Greg Kurz | ad0b46e | 2017-02-26 23:44:20 +0100 | [diff] [blame] | 944 | |
| 945 | omap_dirfd = openat_dir(odirfd, VIRTFS_META_DIR); |
| 946 | if (omap_dirfd == -1) { |
| 947 | goto err; |
| 948 | } |
| 949 | |
| 950 | nmap_dirfd = openat_dir(ndirfd, VIRTFS_META_DIR); |
| 951 | if (nmap_dirfd == -1) { |
| 952 | close_preserve_errno(omap_dirfd); |
| 953 | goto err; |
| 954 | } |
| 955 | |
| 956 | ret = linkat(omap_dirfd, oname, nmap_dirfd, name, 0); |
| 957 | close_preserve_errno(nmap_dirfd); |
| 958 | close_preserve_errno(omap_dirfd); |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 959 | if (ret < 0 && errno != ENOENT) { |
Greg Kurz | ad0b46e | 2017-02-26 23:44:20 +0100 | [diff] [blame] | 960 | goto err_undo_link; |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 961 | } |
Greg Kurz | 6dd4b1f | 2017-02-26 23:44:11 +0100 | [diff] [blame] | 962 | |
Greg Kurz | ad0b46e | 2017-02-26 23:44:20 +0100 | [diff] [blame] | 963 | ret = 0; |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 964 | } |
Greg Kurz | ad0b46e | 2017-02-26 23:44:20 +0100 | [diff] [blame] | 965 | goto out_close; |
| 966 | |
| 967 | err: |
| 968 | ret = -1; |
| 969 | err_undo_link: |
| 970 | unlinkat_preserve_errno(ndirfd, name, 0); |
| 971 | out_close: |
| 972 | close_preserve_errno(ndirfd); |
| 973 | close_preserve_errno(odirfd); |
Greg Kurz | 6dd4b1f | 2017-02-26 23:44:11 +0100 | [diff] [blame] | 974 | out: |
Greg Kurz | ad0b46e | 2017-02-26 23:44:20 +0100 | [diff] [blame] | 975 | g_free(oname); |
| 976 | g_free(odirpath); |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 977 | return ret; |
Anthony Liguori | c494dd6 | 2010-04-29 17:44:59 +0530 | [diff] [blame] | 978 | } |
| 979 | |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 980 | static int local_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size) |
Anthony Liguori | 8cf89e0 | 2010-04-29 17:45:00 +0530 | [diff] [blame] | 981 | { |
Greg Kurz | ac125d9 | 2017-02-26 23:43:32 +0100 | [diff] [blame] | 982 | int fd, ret; |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 983 | |
Greg Kurz | ac125d9 | 2017-02-26 23:43:32 +0100 | [diff] [blame] | 984 | fd = local_open_nofollow(ctx, fs_path->data, O_WRONLY, 0); |
| 985 | if (fd == -1) { |
| 986 | return -1; |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 987 | } |
Greg Kurz | ac125d9 | 2017-02-26 23:43:32 +0100 | [diff] [blame] | 988 | ret = ftruncate(fd, size); |
| 989 | close_preserve_errno(fd); |
Anthony Liguori | a923155 | 2010-04-29 17:44:56 +0530 | [diff] [blame] | 990 | return ret; |
Anthony Liguori | 8cf89e0 | 2010-04-29 17:45:00 +0530 | [diff] [blame] | 991 | } |
| 992 | |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 993 | static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp) |
Anthony Liguori | 8cf89e0 | 2010-04-29 17:45:00 +0530 | [diff] [blame] | 994 | { |
Greg Kurz | d369f20 | 2017-02-26 23:44:37 +0100 | [diff] [blame] | 995 | char *dirpath = g_path_get_dirname(fs_path->data); |
| 996 | char *name = g_path_get_basename(fs_path->data); |
Chen Gang | 4fa4ce7 | 2014-03-02 01:36:19 +0800 | [diff] [blame] | 997 | int ret = -1; |
Greg Kurz | d369f20 | 2017-02-26 23:44:37 +0100 | [diff] [blame] | 998 | int dirfd; |
| 999 | |
| 1000 | dirfd = local_opendir_nofollow(fs_ctx, dirpath); |
| 1001 | if (dirfd == -1) { |
| 1002 | goto out; |
| 1003 | } |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1004 | |
Sripathi Kodi | c79ce73 | 2010-06-17 18:18:47 +0530 | [diff] [blame] | 1005 | if ((credp->fc_uid == -1 && credp->fc_gid == -1) || |
Aneesh Kumar K.V | 17b1971 | 2011-10-25 12:10:39 +0530 | [diff] [blame] | 1006 | (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || |
| 1007 | (fs_ctx->export_flags & V9FS_SM_NONE)) { |
Greg Kurz | d369f20 | 2017-02-26 23:44:37 +0100 | [diff] [blame] | 1008 | ret = fchownat(dirfd, name, credp->fc_uid, credp->fc_gid, |
| 1009 | AT_SYMLINK_NOFOLLOW); |
Aneesh Kumar K.V | b97400c | 2011-10-13 13:21:00 +0530 | [diff] [blame] | 1010 | } else if (fs_ctx->export_flags & V9FS_SM_MAPPED) { |
Greg Kurz | d369f20 | 2017-02-26 23:44:37 +0100 | [diff] [blame] | 1011 | ret = local_set_xattrat(dirfd, name, credp); |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 1012 | } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
Greg Kurz | d369f20 | 2017-02-26 23:44:37 +0100 | [diff] [blame] | 1013 | ret = local_set_mapped_file_attrat(dirfd, name, credp); |
Venkateswararao Jujjuri (JV) | f7613be | 2010-06-14 13:34:43 -0700 | [diff] [blame] | 1014 | } |
Greg Kurz | d369f20 | 2017-02-26 23:44:37 +0100 | [diff] [blame] | 1015 | |
| 1016 | close_preserve_errno(dirfd); |
| 1017 | out: |
| 1018 | g_free(name); |
| 1019 | g_free(dirpath); |
Chen Gang | 4fa4ce7 | 2014-03-02 01:36:19 +0800 | [diff] [blame] | 1020 | return ret; |
Anthony Liguori | 8cf89e0 | 2010-04-29 17:45:00 +0530 | [diff] [blame] | 1021 | } |
| 1022 | |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1023 | static int local_utimensat(FsContext *s, V9fsPath *fs_path, |
Hidetoshi Seto | 3867142 | 2010-11-24 11:38:10 +0900 | [diff] [blame] | 1024 | const struct timespec *buf) |
Anthony Liguori | 8cf89e0 | 2010-04-29 17:45:00 +0530 | [diff] [blame] | 1025 | { |
Greg Kurz | a33eda0 | 2017-02-26 23:43:17 +0100 | [diff] [blame] | 1026 | char *dirpath = g_path_get_dirname(fs_path->data); |
| 1027 | char *name = g_path_get_basename(fs_path->data); |
| 1028 | int dirfd, ret = -1; |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1029 | |
Greg Kurz | a33eda0 | 2017-02-26 23:43:17 +0100 | [diff] [blame] | 1030 | dirfd = local_opendir_nofollow(s, dirpath); |
| 1031 | if (dirfd == -1) { |
| 1032 | goto out; |
| 1033 | } |
| 1034 | |
| 1035 | ret = utimensat(dirfd, name, buf, AT_SYMLINK_NOFOLLOW); |
| 1036 | close_preserve_errno(dirfd); |
| 1037 | out: |
| 1038 | g_free(dirpath); |
| 1039 | g_free(name); |
Chen Gang | 4fa4ce7 | 2014-03-02 01:36:19 +0800 | [diff] [blame] | 1040 | return ret; |
Anthony Liguori | 8cf89e0 | 2010-04-29 17:45:00 +0530 | [diff] [blame] | 1041 | } |
| 1042 | |
Greg Kurz | df4938a | 2017-02-26 23:43:00 +0100 | [diff] [blame] | 1043 | static int local_unlinkat_common(FsContext *ctx, int dirfd, const char *name, |
| 1044 | int flags) |
Anthony Liguori | 5bae190 | 2010-04-29 17:45:01 +0530 | [diff] [blame] | 1045 | { |
Greg Kurz | df4938a | 2017-02-26 23:43:00 +0100 | [diff] [blame] | 1046 | int ret = -1; |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 1047 | |
| 1048 | if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
Greg Kurz | df4938a | 2017-02-26 23:43:00 +0100 | [diff] [blame] | 1049 | int map_dirfd; |
| 1050 | |
Greg Kurz | 6a87e79 | 2017-05-25 10:30:13 +0200 | [diff] [blame] | 1051 | /* We need to remove the metadata as well: |
| 1052 | * - the metadata directory if we're removing a directory |
| 1053 | * - the metadata file in the parent's metadata directory |
| 1054 | * |
| 1055 | * If any of these are missing (ie, ENOENT) then we're probably |
| 1056 | * trying to remove something that wasn't created in mapped-file |
| 1057 | * mode. We just ignore the error. |
| 1058 | */ |
Greg Kurz | df4938a | 2017-02-26 23:43:00 +0100 | [diff] [blame] | 1059 | if (flags == AT_REMOVEDIR) { |
| 1060 | int fd; |
| 1061 | |
Greg Kurz | b003fc0 | 2017-03-06 17:34:01 +0100 | [diff] [blame] | 1062 | fd = openat_dir(dirfd, name); |
Greg Kurz | df4938a | 2017-02-26 23:43:00 +0100 | [diff] [blame] | 1063 | if (fd == -1) { |
| 1064 | goto err_out; |
| 1065 | } |
Greg Kurz | df4938a | 2017-02-26 23:43:00 +0100 | [diff] [blame] | 1066 | ret = unlinkat(fd, VIRTFS_META_DIR, AT_REMOVEDIR); |
| 1067 | close_preserve_errno(fd); |
| 1068 | if (ret < 0 && errno != ENOENT) { |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 1069 | goto err_out; |
| 1070 | } |
| 1071 | } |
Greg Kurz | df4938a | 2017-02-26 23:43:00 +0100 | [diff] [blame] | 1072 | map_dirfd = openat_dir(dirfd, VIRTFS_META_DIR); |
Greg Kurz | 6a87e79 | 2017-05-25 10:30:13 +0200 | [diff] [blame] | 1073 | if (map_dirfd != -1) { |
| 1074 | ret = unlinkat(map_dirfd, name, 0); |
| 1075 | close_preserve_errno(map_dirfd); |
| 1076 | if (ret < 0 && errno != ENOENT) { |
| 1077 | goto err_out; |
| 1078 | } |
| 1079 | } else if (errno != ENOENT) { |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 1080 | goto err_out; |
| 1081 | } |
| 1082 | } |
Chen Gang | 4fa4ce7 | 2014-03-02 01:36:19 +0800 | [diff] [blame] | 1083 | |
Greg Kurz | df4938a | 2017-02-26 23:43:00 +0100 | [diff] [blame] | 1084 | ret = unlinkat(dirfd, name, flags); |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 1085 | err_out: |
Greg Kurz | df4938a | 2017-02-26 23:43:00 +0100 | [diff] [blame] | 1086 | return ret; |
| 1087 | } |
| 1088 | |
Anthony Liguori | 8cf89e0 | 2010-04-29 17:45:00 +0530 | [diff] [blame] | 1089 | static int local_remove(FsContext *ctx, const char *path) |
| 1090 | { |
Anthony Liguori | 8cf89e0 | 2010-04-29 17:45:00 +0530 | [diff] [blame] | 1091 | struct stat stbuf; |
Greg Kurz | a0e640a | 2017-02-26 23:43:08 +0100 | [diff] [blame] | 1092 | char *dirpath = g_path_get_dirname(path); |
| 1093 | char *name = g_path_get_basename(path); |
| 1094 | int flags = 0; |
| 1095 | int dirfd; |
| 1096 | int err = -1; |
Anthony Liguori | 8cf89e0 | 2010-04-29 17:45:00 +0530 | [diff] [blame] | 1097 | |
Greg Kurz | a0e640a | 2017-02-26 23:43:08 +0100 | [diff] [blame] | 1098 | dirfd = local_opendir_nofollow(ctx, dirpath); |
Greg Kurz | b7361d4 | 2017-03-06 17:34:01 +0100 | [diff] [blame] | 1099 | if (dirfd == -1) { |
Greg Kurz | a0e640a | 2017-02-26 23:43:08 +0100 | [diff] [blame] | 1100 | goto out; |
Anthony Liguori | 8cf89e0 | 2010-04-29 17:45:00 +0530 | [diff] [blame] | 1101 | } |
Anthony Liguori | 5bae190 | 2010-04-29 17:45:01 +0530 | [diff] [blame] | 1102 | |
Bruce Rogers | 790db7e | 2017-06-29 15:11:50 +0200 | [diff] [blame] | 1103 | if (fstatat(dirfd, name, &stbuf, AT_SYMLINK_NOFOLLOW) < 0) { |
Greg Kurz | a0e640a | 2017-02-26 23:43:08 +0100 | [diff] [blame] | 1104 | goto err_out; |
| 1105 | } |
| 1106 | |
| 1107 | if (S_ISDIR(stbuf.st_mode)) { |
| 1108 | flags |= AT_REMOVEDIR; |
| 1109 | } |
| 1110 | |
| 1111 | err = local_unlinkat_common(ctx, dirfd, name, flags); |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 1112 | err_out: |
Greg Kurz | a0e640a | 2017-02-26 23:43:08 +0100 | [diff] [blame] | 1113 | close_preserve_errno(dirfd); |
| 1114 | out: |
| 1115 | g_free(name); |
| 1116 | g_free(dirpath); |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 1117 | return err; |
Anthony Liguori | 5bae190 | 2010-04-29 17:45:01 +0530 | [diff] [blame] | 1118 | } |
| 1119 | |
Aneesh Kumar K.V | 8b88827 | 2011-12-04 22:35:28 +0530 | [diff] [blame] | 1120 | static int local_fsync(FsContext *ctx, int fid_type, |
| 1121 | V9fsFidOpenState *fs, int datasync) |
Anthony Liguori | 8cf89e0 | 2010-04-29 17:45:00 +0530 | [diff] [blame] | 1122 | { |
Aneesh Kumar K.V | 8b88827 | 2011-12-04 22:35:28 +0530 | [diff] [blame] | 1123 | int fd; |
| 1124 | |
| 1125 | if (fid_type == P9_FID_DIR) { |
Greg Kurz | f314ea4 | 2016-06-06 11:52:34 +0200 | [diff] [blame] | 1126 | fd = dirfd(fs->dir.stream); |
Venkateswararao Jujjuri (JV) | 4959497 | 2010-10-22 10:08:45 -0700 | [diff] [blame] | 1127 | } else { |
Aneesh Kumar K.V | 8b88827 | 2011-12-04 22:35:28 +0530 | [diff] [blame] | 1128 | fd = fs->fd; |
| 1129 | } |
| 1130 | |
| 1131 | if (datasync) { |
| 1132 | return qemu_fdatasync(fd); |
| 1133 | } else { |
| 1134 | return fsync(fd); |
Venkateswararao Jujjuri (JV) | 4959497 | 2010-10-22 10:08:45 -0700 | [diff] [blame] | 1135 | } |
Anthony Liguori | 8cf89e0 | 2010-04-29 17:45:00 +0530 | [diff] [blame] | 1136 | } |
| 1137 | |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1138 | static int local_statfs(FsContext *s, V9fsPath *fs_path, struct statfs *stbuf) |
M. Mohan Kumar | be940c8 | 2010-05-10 12:11:03 +0530 | [diff] [blame] | 1139 | { |
Greg Kurz | 31e51d1 | 2017-02-26 23:43:25 +0100 | [diff] [blame] | 1140 | int fd, ret; |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1141 | |
Greg Kurz | 31e51d1 | 2017-02-26 23:43:25 +0100 | [diff] [blame] | 1142 | fd = local_open_nofollow(s, fs_path->data, O_RDONLY, 0); |
Greg Kurz | 23da014 | 2017-03-06 17:34:01 +0100 | [diff] [blame] | 1143 | if (fd == -1) { |
| 1144 | return -1; |
| 1145 | } |
Greg Kurz | 31e51d1 | 2017-02-26 23:43:25 +0100 | [diff] [blame] | 1146 | ret = fstatfs(fd, stbuf); |
| 1147 | close_preserve_errno(fd); |
Chen Gang | 4fa4ce7 | 2014-03-02 01:36:19 +0800 | [diff] [blame] | 1148 | return ret; |
M. Mohan Kumar | be940c8 | 2010-05-10 12:11:03 +0530 | [diff] [blame] | 1149 | } |
| 1150 | |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1151 | static ssize_t local_lgetxattr(FsContext *ctx, V9fsPath *fs_path, |
Aneesh Kumar K.V | fa32ef8 | 2010-09-02 11:09:06 +0530 | [diff] [blame] | 1152 | const char *name, void *value, size_t size) |
| 1153 | { |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1154 | char *path = fs_path->data; |
| 1155 | |
Aneesh Kumar K.V | fc22118 | 2010-10-18 15:28:16 +0530 | [diff] [blame] | 1156 | return v9fs_get_xattr(ctx, path, name, value, size); |
Aneesh Kumar K.V | fa32ef8 | 2010-09-02 11:09:06 +0530 | [diff] [blame] | 1157 | } |
| 1158 | |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1159 | static ssize_t local_llistxattr(FsContext *ctx, V9fsPath *fs_path, |
Aneesh Kumar K.V | fa32ef8 | 2010-09-02 11:09:06 +0530 | [diff] [blame] | 1160 | void *value, size_t size) |
| 1161 | { |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1162 | char *path = fs_path->data; |
| 1163 | |
Aneesh Kumar K.V | fc22118 | 2010-10-18 15:28:16 +0530 | [diff] [blame] | 1164 | return v9fs_list_xattr(ctx, path, value, size); |
Aneesh Kumar K.V | fa32ef8 | 2010-09-02 11:09:06 +0530 | [diff] [blame] | 1165 | } |
| 1166 | |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1167 | static int local_lsetxattr(FsContext *ctx, V9fsPath *fs_path, const char *name, |
Aneesh Kumar K.V | 10b468b | 2010-09-02 11:09:07 +0530 | [diff] [blame] | 1168 | void *value, size_t size, int flags) |
| 1169 | { |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1170 | char *path = fs_path->data; |
| 1171 | |
Aneesh Kumar K.V | fc22118 | 2010-10-18 15:28:16 +0530 | [diff] [blame] | 1172 | return v9fs_set_xattr(ctx, path, name, value, size, flags); |
Aneesh Kumar K.V | 10b468b | 2010-09-02 11:09:07 +0530 | [diff] [blame] | 1173 | } |
| 1174 | |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1175 | static int local_lremovexattr(FsContext *ctx, V9fsPath *fs_path, |
| 1176 | const char *name) |
Aneesh Kumar K.V | 9ed3ef2 | 2010-08-26 11:15:23 +0530 | [diff] [blame] | 1177 | { |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1178 | char *path = fs_path->data; |
| 1179 | |
Aneesh Kumar K.V | fc22118 | 2010-10-18 15:28:16 +0530 | [diff] [blame] | 1180 | return v9fs_remove_xattr(ctx, path, name); |
Aneesh Kumar K.V | 9ed3ef2 | 2010-08-26 11:15:23 +0530 | [diff] [blame] | 1181 | } |
| 1182 | |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1183 | static int local_name_to_path(FsContext *ctx, V9fsPath *dir_path, |
| 1184 | const char *name, V9fsPath *target) |
| 1185 | { |
Greg Kurz | 7a95434 | 2017-05-05 14:48:08 +0200 | [diff] [blame] | 1186 | if (ctx->export_flags & V9FS_SM_MAPPED_FILE && |
| 1187 | local_is_mapped_file_metadata(ctx, name)) { |
| 1188 | errno = EINVAL; |
| 1189 | return -1; |
| 1190 | } |
| 1191 | |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1192 | if (dir_path) { |
Greg Kurz | f57f587 | 2017-05-25 10:30:14 +0200 | [diff] [blame] | 1193 | if (!strcmp(name, ".")) { |
| 1194 | /* "." relative to "foo/bar" is "foo/bar" */ |
| 1195 | v9fs_path_copy(target, dir_path); |
| 1196 | } else if (!strcmp(name, "..")) { |
| 1197 | if (!strcmp(dir_path->data, ".")) { |
| 1198 | /* ".." relative to the root is "." */ |
| 1199 | v9fs_path_sprintf(target, "."); |
| 1200 | } else { |
| 1201 | char *tmp = g_path_get_dirname(dir_path->data); |
| 1202 | /* Symbolic links are resolved by the client. We can assume |
| 1203 | * that ".." relative to "foo/bar" is equivalent to "foo" |
| 1204 | */ |
| 1205 | v9fs_path_sprintf(target, "%s", tmp); |
| 1206 | g_free(tmp); |
| 1207 | } |
| 1208 | } else { |
| 1209 | assert(!strchr(name, '/')); |
| 1210 | v9fs_path_sprintf(target, "%s/%s", dir_path->data, name); |
| 1211 | } |
| 1212 | } else if (!strcmp(name, "/") || !strcmp(name, ".") || |
| 1213 | !strcmp(name, "..")) { |
| 1214 | /* This is the root fid */ |
| 1215 | v9fs_path_sprintf(target, "."); |
Greg Kurz | 9c6b899 | 2017-04-17 10:53:23 +0200 | [diff] [blame] | 1216 | } else { |
Greg Kurz | f57f587 | 2017-05-25 10:30:14 +0200 | [diff] [blame] | 1217 | assert(!strchr(name, '/')); |
| 1218 | v9fs_path_sprintf(target, "./%s", name); |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1219 | } |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1220 | return 0; |
| 1221 | } |
| 1222 | |
| 1223 | static int local_renameat(FsContext *ctx, V9fsPath *olddir, |
| 1224 | const char *old_name, V9fsPath *newdir, |
| 1225 | const char *new_name) |
| 1226 | { |
| 1227 | int ret; |
Greg Kurz | 99f2cf4 | 2017-02-26 23:43:55 +0100 | [diff] [blame] | 1228 | int odirfd, ndirfd; |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1229 | |
Greg Kurz | 7a95434 | 2017-05-05 14:48:08 +0200 | [diff] [blame] | 1230 | if (ctx->export_flags & V9FS_SM_MAPPED_FILE && |
| 1231 | (local_is_mapped_file_metadata(ctx, old_name) || |
| 1232 | local_is_mapped_file_metadata(ctx, new_name))) { |
| 1233 | errno = EINVAL; |
| 1234 | return -1; |
| 1235 | } |
| 1236 | |
Greg Kurz | 99f2cf4 | 2017-02-26 23:43:55 +0100 | [diff] [blame] | 1237 | odirfd = local_opendir_nofollow(ctx, olddir->data); |
| 1238 | if (odirfd == -1) { |
| 1239 | return -1; |
| 1240 | } |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1241 | |
Greg Kurz | 99f2cf4 | 2017-02-26 23:43:55 +0100 | [diff] [blame] | 1242 | ndirfd = local_opendir_nofollow(ctx, newdir->data); |
| 1243 | if (ndirfd == -1) { |
| 1244 | close_preserve_errno(odirfd); |
| 1245 | return -1; |
| 1246 | } |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1247 | |
Greg Kurz | 99f2cf4 | 2017-02-26 23:43:55 +0100 | [diff] [blame] | 1248 | ret = renameat(odirfd, old_name, ndirfd, new_name); |
| 1249 | if (ret < 0) { |
| 1250 | goto out; |
| 1251 | } |
| 1252 | |
| 1253 | if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| 1254 | int omap_dirfd, nmap_dirfd; |
| 1255 | |
| 1256 | ret = mkdirat(ndirfd, VIRTFS_META_DIR, 0700); |
| 1257 | if (ret < 0 && errno != EEXIST) { |
| 1258 | goto err_undo_rename; |
| 1259 | } |
| 1260 | |
Greg Kurz | 6dd4b1f | 2017-02-26 23:44:11 +0100 | [diff] [blame] | 1261 | omap_dirfd = openat_dir(odirfd, VIRTFS_META_DIR); |
Greg Kurz | 99f2cf4 | 2017-02-26 23:43:55 +0100 | [diff] [blame] | 1262 | if (omap_dirfd == -1) { |
| 1263 | goto err; |
| 1264 | } |
| 1265 | |
Greg Kurz | 6dd4b1f | 2017-02-26 23:44:11 +0100 | [diff] [blame] | 1266 | nmap_dirfd = openat_dir(ndirfd, VIRTFS_META_DIR); |
Greg Kurz | 99f2cf4 | 2017-02-26 23:43:55 +0100 | [diff] [blame] | 1267 | if (nmap_dirfd == -1) { |
| 1268 | close_preserve_errno(omap_dirfd); |
| 1269 | goto err; |
| 1270 | } |
| 1271 | |
| 1272 | /* rename the .virtfs_metadata files */ |
| 1273 | ret = renameat(omap_dirfd, old_name, nmap_dirfd, new_name); |
| 1274 | close_preserve_errno(nmap_dirfd); |
| 1275 | close_preserve_errno(omap_dirfd); |
| 1276 | if (ret < 0 && errno != ENOENT) { |
| 1277 | goto err_undo_rename; |
| 1278 | } |
| 1279 | |
| 1280 | ret = 0; |
| 1281 | } |
| 1282 | goto out; |
| 1283 | |
| 1284 | err: |
| 1285 | ret = -1; |
| 1286 | err_undo_rename: |
| 1287 | renameat_preserve_errno(ndirfd, new_name, odirfd, old_name); |
| 1288 | out: |
| 1289 | close_preserve_errno(ndirfd); |
| 1290 | close_preserve_errno(odirfd); |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1291 | return ret; |
| 1292 | } |
| 1293 | |
Greg Kurz | d2767ed | 2017-02-26 23:44:03 +0100 | [diff] [blame] | 1294 | static void v9fs_path_init_dirname(V9fsPath *path, const char *str) |
| 1295 | { |
| 1296 | path->data = g_path_get_dirname(str); |
| 1297 | path->size = strlen(path->data) + 1; |
| 1298 | } |
| 1299 | |
| 1300 | static int local_rename(FsContext *ctx, const char *oldpath, |
| 1301 | const char *newpath) |
| 1302 | { |
| 1303 | int err; |
| 1304 | char *oname = g_path_get_basename(oldpath); |
| 1305 | char *nname = g_path_get_basename(newpath); |
| 1306 | V9fsPath olddir, newdir; |
| 1307 | |
| 1308 | v9fs_path_init_dirname(&olddir, oldpath); |
| 1309 | v9fs_path_init_dirname(&newdir, newpath); |
| 1310 | |
| 1311 | err = local_renameat(ctx, &olddir, oname, &newdir, nname); |
| 1312 | |
| 1313 | v9fs_path_free(&newdir); |
| 1314 | v9fs_path_free(&olddir); |
| 1315 | g_free(nname); |
| 1316 | g_free(oname); |
| 1317 | |
| 1318 | return err; |
| 1319 | } |
| 1320 | |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1321 | static int local_unlinkat(FsContext *ctx, V9fsPath *dir, |
| 1322 | const char *name, int flags) |
| 1323 | { |
| 1324 | int ret; |
Greg Kurz | df4938a | 2017-02-26 23:43:00 +0100 | [diff] [blame] | 1325 | int dirfd; |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 1326 | |
Greg Kurz | 7a95434 | 2017-05-05 14:48:08 +0200 | [diff] [blame] | 1327 | if (ctx->export_flags & V9FS_SM_MAPPED_FILE && |
| 1328 | local_is_mapped_file_metadata(ctx, name)) { |
| 1329 | errno = EINVAL; |
| 1330 | return -1; |
| 1331 | } |
| 1332 | |
Greg Kurz | df4938a | 2017-02-26 23:43:00 +0100 | [diff] [blame] | 1333 | dirfd = local_opendir_nofollow(ctx, dir->data); |
| 1334 | if (dirfd == -1) { |
| 1335 | return -1; |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 1336 | } |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1337 | |
Greg Kurz | df4938a | 2017-02-26 23:43:00 +0100 | [diff] [blame] | 1338 | ret = local_unlinkat_common(ctx, dirfd, name, flags); |
| 1339 | close_preserve_errno(dirfd); |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1340 | return ret; |
| 1341 | } |
Aneesh Kumar K.V | 9ed3ef2 | 2010-08-26 11:15:23 +0530 | [diff] [blame] | 1342 | |
Harsh Prateek Bora | e06a765 | 2011-10-12 19:11:25 +0530 | [diff] [blame] | 1343 | static int local_ioc_getversion(FsContext *ctx, V9fsPath *path, |
| 1344 | mode_t st_mode, uint64_t *st_gen) |
| 1345 | { |
Paolo Bonzini | ae0f940 | 2011-11-21 09:29:11 +0100 | [diff] [blame] | 1346 | #ifdef FS_IOC_GETVERSION |
Kirill A. Shutemov | 0e5fc99 | 2014-01-28 17:08:24 +0200 | [diff] [blame] | 1347 | int err; |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 1348 | V9fsFidOpenState fid_open; |
| 1349 | |
Harsh Prateek Bora | e06a765 | 2011-10-12 19:11:25 +0530 | [diff] [blame] | 1350 | /* |
| 1351 | * Do not try to open special files like device nodes, fifos etc |
| 1352 | * We can get fd for regular files and directories only |
| 1353 | */ |
| 1354 | if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) { |
Kirill A. Shutemov | 1a9978a | 2014-01-28 17:08:26 +0200 | [diff] [blame] | 1355 | errno = ENOTTY; |
| 1356 | return -1; |
Harsh Prateek Bora | e06a765 | 2011-10-12 19:11:25 +0530 | [diff] [blame] | 1357 | } |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 1358 | err = local_open(ctx, path, O_RDONLY, &fid_open); |
| 1359 | if (err < 0) { |
| 1360 | return err; |
Harsh Prateek Bora | e06a765 | 2011-10-12 19:11:25 +0530 | [diff] [blame] | 1361 | } |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 1362 | err = ioctl(fid_open.fd, FS_IOC_GETVERSION, st_gen); |
| 1363 | local_close(ctx, &fid_open); |
Harsh Prateek Bora | e06a765 | 2011-10-12 19:11:25 +0530 | [diff] [blame] | 1364 | return err; |
Kirill A. Shutemov | 0e5fc99 | 2014-01-28 17:08:24 +0200 | [diff] [blame] | 1365 | #else |
| 1366 | errno = ENOTTY; |
| 1367 | return -1; |
| 1368 | #endif |
Harsh Prateek Bora | e06a765 | 2011-10-12 19:11:25 +0530 | [diff] [blame] | 1369 | } |
| 1370 | |
Aneesh Kumar K.V | 0174fe7 | 2011-08-02 11:35:54 +0530 | [diff] [blame] | 1371 | static int local_init(FsContext *ctx) |
| 1372 | { |
Harsh Prateek Bora | e06a765 | 2011-10-12 19:11:25 +0530 | [diff] [blame] | 1373 | struct statfs stbuf; |
Greg Kurz | 0e35a37 | 2017-02-26 23:42:10 +0100 | [diff] [blame] | 1374 | LocalData *data = g_malloc(sizeof(*data)); |
| 1375 | |
| 1376 | data->mountfd = open(ctx->fs_root, O_DIRECTORY | O_RDONLY); |
| 1377 | if (data->mountfd == -1) { |
| 1378 | goto err; |
| 1379 | } |
Harsh Prateek Bora | e06a765 | 2011-10-12 19:11:25 +0530 | [diff] [blame] | 1380 | |
Greg Kurz | 00c90bd | 2017-02-26 23:41:48 +0100 | [diff] [blame] | 1381 | #ifdef FS_IOC_GETVERSION |
| 1382 | /* |
| 1383 | * use ioc_getversion only if the ioctl is definied |
| 1384 | */ |
Greg Kurz | 0e35a37 | 2017-02-26 23:42:10 +0100 | [diff] [blame] | 1385 | if (fstatfs(data->mountfd, &stbuf) < 0) { |
| 1386 | close_preserve_errno(data->mountfd); |
| 1387 | goto err; |
Greg Kurz | 00c90bd | 2017-02-26 23:41:48 +0100 | [diff] [blame] | 1388 | } |
| 1389 | switch (stbuf.f_type) { |
| 1390 | case EXT2_SUPER_MAGIC: |
| 1391 | case BTRFS_SUPER_MAGIC: |
| 1392 | case REISERFS_SUPER_MAGIC: |
| 1393 | case XFS_SUPER_MAGIC: |
| 1394 | ctx->exops.get_st_gen = local_ioc_getversion; |
| 1395 | break; |
| 1396 | } |
| 1397 | #endif |
Aneesh Kumar K.V | 0174fe7 | 2011-08-02 11:35:54 +0530 | [diff] [blame] | 1398 | |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 1399 | if (ctx->export_flags & V9FS_SM_PASSTHROUGH) { |
| 1400 | ctx->xops = passthrough_xattr_ops; |
| 1401 | } else if (ctx->export_flags & V9FS_SM_MAPPED) { |
| 1402 | ctx->xops = mapped_xattr_ops; |
| 1403 | } else if (ctx->export_flags & V9FS_SM_NONE) { |
| 1404 | ctx->xops = none_xattr_ops; |
| 1405 | } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| 1406 | /* |
| 1407 | * xattr operation for mapped-file and passthrough |
| 1408 | * remain same. |
| 1409 | */ |
| 1410 | ctx->xops = passthrough_xattr_ops; |
| 1411 | } |
Aneesh Kumar K.V | c98f1d4 | 2011-10-12 20:59:18 +0530 | [diff] [blame] | 1412 | ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT; |
Greg Kurz | 00c90bd | 2017-02-26 23:41:48 +0100 | [diff] [blame] | 1413 | |
Greg Kurz | 0e35a37 | 2017-02-26 23:42:10 +0100 | [diff] [blame] | 1414 | ctx->private = data; |
Greg Kurz | 00c90bd | 2017-02-26 23:41:48 +0100 | [diff] [blame] | 1415 | return 0; |
Greg Kurz | 0e35a37 | 2017-02-26 23:42:10 +0100 | [diff] [blame] | 1416 | |
| 1417 | err: |
| 1418 | g_free(data); |
| 1419 | return -1; |
| 1420 | } |
| 1421 | |
| 1422 | static void local_cleanup(FsContext *ctx) |
| 1423 | { |
| 1424 | LocalData *data = ctx->private; |
| 1425 | |
| 1426 | close(data->mountfd); |
| 1427 | g_free(data); |
Aneesh Kumar K.V | 0174fe7 | 2011-08-02 11:35:54 +0530 | [diff] [blame] | 1428 | } |
| 1429 | |
Aneesh Kumar K.V | 99519f0 | 2011-12-14 13:48:59 +0530 | [diff] [blame] | 1430 | static int local_parse_opts(QemuOpts *opts, struct FsDriverEntry *fse) |
| 1431 | { |
| 1432 | const char *sec_model = qemu_opt_get(opts, "security_model"); |
| 1433 | const char *path = qemu_opt_get(opts, "path"); |
Pradeep Jagadeesh | b8bbdb8 | 2017-02-28 10:31:46 +0100 | [diff] [blame] | 1434 | Error *err = NULL; |
Aneesh Kumar K.V | 99519f0 | 2011-12-14 13:48:59 +0530 | [diff] [blame] | 1435 | |
| 1436 | if (!sec_model) { |
Greg Kurz | 63325b1 | 2016-01-22 15:12:17 +0100 | [diff] [blame] | 1437 | error_report("Security model not specified, local fs needs security model"); |
| 1438 | error_printf("valid options are:" |
| 1439 | "\tsecurity_model=[passthrough|mapped-xattr|mapped-file|none]\n"); |
Aneesh Kumar K.V | 99519f0 | 2011-12-14 13:48:59 +0530 | [diff] [blame] | 1440 | return -1; |
| 1441 | } |
| 1442 | |
| 1443 | if (!strcmp(sec_model, "passthrough")) { |
| 1444 | fse->export_flags |= V9FS_SM_PASSTHROUGH; |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 1445 | } else if (!strcmp(sec_model, "mapped") || |
| 1446 | !strcmp(sec_model, "mapped-xattr")) { |
Aneesh Kumar K.V | 99519f0 | 2011-12-14 13:48:59 +0530 | [diff] [blame] | 1447 | fse->export_flags |= V9FS_SM_MAPPED; |
| 1448 | } else if (!strcmp(sec_model, "none")) { |
| 1449 | fse->export_flags |= V9FS_SM_NONE; |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 1450 | } else if (!strcmp(sec_model, "mapped-file")) { |
| 1451 | fse->export_flags |= V9FS_SM_MAPPED_FILE; |
Aneesh Kumar K.V | 99519f0 | 2011-12-14 13:48:59 +0530 | [diff] [blame] | 1452 | } else { |
Greg Kurz | 63325b1 | 2016-01-22 15:12:17 +0100 | [diff] [blame] | 1453 | error_report("Invalid security model %s specified", sec_model); |
| 1454 | error_printf("valid options are:" |
| 1455 | "\t[passthrough|mapped-xattr|mapped-file|none]\n"); |
Aneesh Kumar K.V | 99519f0 | 2011-12-14 13:48:59 +0530 | [diff] [blame] | 1456 | return -1; |
| 1457 | } |
| 1458 | |
| 1459 | if (!path) { |
Greg Kurz | 63325b1 | 2016-01-22 15:12:17 +0100 | [diff] [blame] | 1460 | error_report("fsdev: No path specified"); |
Aneesh Kumar K.V | 99519f0 | 2011-12-14 13:48:59 +0530 | [diff] [blame] | 1461 | return -1; |
| 1462 | } |
Pradeep Jagadeesh | b8bbdb8 | 2017-02-28 10:31:46 +0100 | [diff] [blame] | 1463 | |
| 1464 | fsdev_throttle_parse_opts(opts, &fse->fst, &err); |
| 1465 | if (err) { |
| 1466 | error_reportf_err(err, "Throttle configuration is not valid: "); |
| 1467 | return -1; |
| 1468 | } |
| 1469 | |
Tobias Schramm | b96feb2 | 2017-06-29 15:11:50 +0200 | [diff] [blame] | 1470 | if (fse->export_flags & V9FS_SM_MAPPED || |
| 1471 | fse->export_flags & V9FS_SM_MAPPED_FILE) { |
| 1472 | fse->fmode = |
| 1473 | qemu_opt_get_number(opts, "fmode", SM_LOCAL_MODE_BITS) & 0777; |
| 1474 | fse->dmode = |
| 1475 | qemu_opt_get_number(opts, "dmode", SM_LOCAL_DIR_MODE_BITS) & 0777; |
| 1476 | } else { |
| 1477 | if (qemu_opt_find(opts, "fmode")) { |
| 1478 | error_report("fmode is only valid for mapped 9p modes"); |
| 1479 | return -1; |
| 1480 | } |
| 1481 | if (qemu_opt_find(opts, "dmode")) { |
| 1482 | error_report("dmode is only valid for mapped 9p modes"); |
| 1483 | return -1; |
| 1484 | } |
| 1485 | } |
| 1486 | |
Aneesh Kumar K.V | 99519f0 | 2011-12-14 13:48:59 +0530 | [diff] [blame] | 1487 | fse->path = g_strdup(path); |
| 1488 | |
| 1489 | return 0; |
| 1490 | } |
| 1491 | |
Anthony Liguori | 9f10751 | 2010-04-29 17:44:44 +0530 | [diff] [blame] | 1492 | FileOperations local_ops = { |
Aneesh Kumar K.V | 99519f0 | 2011-12-14 13:48:59 +0530 | [diff] [blame] | 1493 | .parse_opts = local_parse_opts, |
Aneesh Kumar K.V | 0174fe7 | 2011-08-02 11:35:54 +0530 | [diff] [blame] | 1494 | .init = local_init, |
Greg Kurz | 0e35a37 | 2017-02-26 23:42:10 +0100 | [diff] [blame] | 1495 | .cleanup = local_cleanup, |
Anthony Liguori | 131dcb2 | 2010-04-29 17:44:47 +0530 | [diff] [blame] | 1496 | .lstat = local_lstat, |
Anthony Liguori | 131dcb2 | 2010-04-29 17:44:47 +0530 | [diff] [blame] | 1497 | .readlink = local_readlink, |
| 1498 | .close = local_close, |
| 1499 | .closedir = local_closedir, |
Anthony Liguori | a6568fe | 2010-04-29 17:44:55 +0530 | [diff] [blame] | 1500 | .open = local_open, |
| 1501 | .opendir = local_opendir, |
Anthony Liguori | a923155 | 2010-04-29 17:44:56 +0530 | [diff] [blame] | 1502 | .rewinddir = local_rewinddir, |
| 1503 | .telldir = local_telldir, |
Greg Kurz | 635324e | 2016-06-06 11:52:34 +0200 | [diff] [blame] | 1504 | .readdir = local_readdir, |
Anthony Liguori | a923155 | 2010-04-29 17:44:56 +0530 | [diff] [blame] | 1505 | .seekdir = local_seekdir, |
Sanchit Garg | 56d15a5 | 2010-10-08 11:30:16 +0530 | [diff] [blame] | 1506 | .preadv = local_preadv, |
| 1507 | .pwritev = local_pwritev, |
Anthony Liguori | c494dd6 | 2010-04-29 17:44:59 +0530 | [diff] [blame] | 1508 | .chmod = local_chmod, |
| 1509 | .mknod = local_mknod, |
Anthony Liguori | c494dd6 | 2010-04-29 17:44:59 +0530 | [diff] [blame] | 1510 | .mkdir = local_mkdir, |
| 1511 | .fstat = local_fstat, |
| 1512 | .open2 = local_open2, |
| 1513 | .symlink = local_symlink, |
| 1514 | .link = local_link, |
Anthony Liguori | 8cf89e0 | 2010-04-29 17:45:00 +0530 | [diff] [blame] | 1515 | .truncate = local_truncate, |
| 1516 | .rename = local_rename, |
| 1517 | .chown = local_chown, |
M. Mohan Kumar | 74bc02b | 2010-06-09 19:14:38 +0530 | [diff] [blame] | 1518 | .utimensat = local_utimensat, |
Anthony Liguori | 5bae190 | 2010-04-29 17:45:01 +0530 | [diff] [blame] | 1519 | .remove = local_remove, |
Anthony Liguori | 8cf89e0 | 2010-04-29 17:45:00 +0530 | [diff] [blame] | 1520 | .fsync = local_fsync, |
M. Mohan Kumar | be940c8 | 2010-05-10 12:11:03 +0530 | [diff] [blame] | 1521 | .statfs = local_statfs, |
Aneesh Kumar K.V | fa32ef8 | 2010-09-02 11:09:06 +0530 | [diff] [blame] | 1522 | .lgetxattr = local_lgetxattr, |
| 1523 | .llistxattr = local_llistxattr, |
Aneesh Kumar K.V | 10b468b | 2010-09-02 11:09:07 +0530 | [diff] [blame] | 1524 | .lsetxattr = local_lsetxattr, |
Aneesh Kumar K.V | 9ed3ef2 | 2010-08-26 11:15:23 +0530 | [diff] [blame] | 1525 | .lremovexattr = local_lremovexattr, |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 1526 | .name_to_path = local_name_to_path, |
| 1527 | .renameat = local_renameat, |
| 1528 | .unlinkat = local_unlinkat, |
Anthony Liguori | 9f10751 | 2010-04-29 17:44:44 +0530 | [diff] [blame] | 1529 | }; |