Aneesh Kumar K.V | 172198d | 2011-05-18 16:04:13 -0700 | [diff] [blame] | 1 | /* |
Greg Kurz | af8b38b | 2016-06-06 11:52:34 +0200 | [diff] [blame] | 2 | * 9p backend |
Aneesh Kumar K.V | 172198d | 2011-05-18 16:04:13 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright IBM, Corp. 2011 |
| 5 | * |
| 6 | * Authors: |
| 7 | * Aneesh Kumar K.V <aneesh.kumar@linux.vnet.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 | */ |
| 13 | |
Christian Schoenebeck | 6f56908 | 2021-05-06 15:12:23 +0200 | [diff] [blame] | 14 | /* |
| 15 | * Not so fast! You might want to read the 9p developer docs first: |
| 16 | * https://wiki.qemu.org/Documentation/9p |
| 17 | */ |
| 18 | |
Peter Maydell | fbc0412 | 2016-01-26 18:17:10 +0000 | [diff] [blame] | 19 | #include "qemu/osdep.h" |
Aneesh Kumar K.V | 172198d | 2011-05-18 16:04:13 -0700 | [diff] [blame] | 20 | #include "fsdev/qemu-fsdev.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 21 | #include "qemu/thread.h" |
Daniel P. Berrange | 10817bf | 2015-09-01 14:48:02 +0100 | [diff] [blame] | 22 | #include "qemu/coroutine.h" |
Markus Armbruster | db72581 | 2019-08-12 07:23:50 +0200 | [diff] [blame] | 23 | #include "qemu/main-loop.h" |
Wei Liu | fe52840 | 2015-11-18 17:57:30 +0000 | [diff] [blame] | 24 | #include "coth.h" |
Aneesh Kumar K.V | 172198d | 2011-05-18 16:04:13 -0700 | [diff] [blame] | 25 | |
Greg Kurz | 5bdade6 | 2016-10-17 14:13:58 +0200 | [diff] [blame] | 26 | int coroutine_fn v9fs_co_st_gen(V9fsPDU *pdu, V9fsPath *path, mode_t st_mode, |
| 27 | V9fsStatDotl *v9stat) |
Harsh Prateek Bora | e06a765 | 2011-10-12 19:11:25 +0530 | [diff] [blame] | 28 | { |
| 29 | int err = 0; |
| 30 | V9fsState *s = pdu->s; |
| 31 | |
| 32 | if (v9fs_request_cancelled(pdu)) { |
| 33 | return -EINTR; |
| 34 | } |
| 35 | if (s->ctx.exops.get_st_gen) { |
| 36 | v9fs_path_read_lock(s); |
| 37 | v9fs_co_run_in_worker( |
| 38 | { |
| 39 | err = s->ctx.exops.get_st_gen(&s->ctx, path, st_mode, |
| 40 | &v9stat->st_gen); |
| 41 | if (err < 0) { |
| 42 | err = -errno; |
| 43 | } |
| 44 | }); |
| 45 | v9fs_path_unlock(s); |
| 46 | } |
| 47 | return err; |
| 48 | } |
| 49 | |
Greg Kurz | 5bdade6 | 2016-10-17 14:13:58 +0200 | [diff] [blame] | 50 | int coroutine_fn v9fs_co_lstat(V9fsPDU *pdu, V9fsPath *path, struct stat *stbuf) |
Aneesh Kumar K.V | 172198d | 2011-05-18 16:04:13 -0700 | [diff] [blame] | 51 | { |
| 52 | int err; |
Aneesh Kumar K.V | bccacf6 | 2011-08-02 11:36:17 +0530 | [diff] [blame] | 53 | V9fsState *s = pdu->s; |
Aneesh Kumar K.V | 172198d | 2011-05-18 16:04:13 -0700 | [diff] [blame] | 54 | |
Aneesh Kumar K.V | bccacf6 | 2011-08-02 11:36:17 +0530 | [diff] [blame] | 55 | if (v9fs_request_cancelled(pdu)) { |
| 56 | return -EINTR; |
| 57 | } |
Aneesh Kumar K.V | 532decb | 2011-08-02 11:35:54 +0530 | [diff] [blame] | 58 | v9fs_path_read_lock(s); |
Aneesh Kumar K.V | 172198d | 2011-05-18 16:04:13 -0700 | [diff] [blame] | 59 | v9fs_co_run_in_worker( |
| 60 | { |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 61 | err = s->ops->lstat(&s->ctx, path, stbuf); |
Aneesh Kumar K.V | 172198d | 2011-05-18 16:04:13 -0700 | [diff] [blame] | 62 | if (err < 0) { |
| 63 | err = -errno; |
| 64 | } |
| 65 | }); |
Aneesh Kumar K.V | 532decb | 2011-08-02 11:35:54 +0530 | [diff] [blame] | 66 | v9fs_path_unlock(s); |
Aneesh Kumar K.V | 172198d | 2011-05-18 16:04:13 -0700 | [diff] [blame] | 67 | return err; |
| 68 | } |
Aneesh Kumar K.V | 03feb1e | 2011-08-22 09:14:04 +0530 | [diff] [blame] | 69 | |
Greg Kurz | 5bdade6 | 2016-10-17 14:13:58 +0200 | [diff] [blame] | 70 | int coroutine_fn v9fs_co_fstat(V9fsPDU *pdu, V9fsFidState *fidp, |
| 71 | struct stat *stbuf) |
Aneesh Kumar K.V | 03feb1e | 2011-08-22 09:14:04 +0530 | [diff] [blame] | 72 | { |
| 73 | int err; |
Aneesh Kumar K.V | bccacf6 | 2011-08-02 11:36:17 +0530 | [diff] [blame] | 74 | V9fsState *s = pdu->s; |
Aneesh Kumar K.V | 03feb1e | 2011-08-22 09:14:04 +0530 | [diff] [blame] | 75 | |
Aneesh Kumar K.V | bccacf6 | 2011-08-02 11:36:17 +0530 | [diff] [blame] | 76 | if (v9fs_request_cancelled(pdu)) { |
| 77 | return -EINTR; |
| 78 | } |
Aneesh Kumar K.V | 03feb1e | 2011-08-22 09:14:04 +0530 | [diff] [blame] | 79 | v9fs_co_run_in_worker( |
| 80 | { |
Aneesh Kumar K.V | 8b88827 | 2011-12-04 22:35:28 +0530 | [diff] [blame] | 81 | err = s->ops->fstat(&s->ctx, fidp->fid_type, &fidp->fs, stbuf); |
Aneesh Kumar K.V | 03feb1e | 2011-08-22 09:14:04 +0530 | [diff] [blame] | 82 | if (err < 0) { |
| 83 | err = -errno; |
| 84 | } |
| 85 | }); |
Aneesh Kumar K.V | 2c30dd7 | 2012-01-19 12:21:11 +0530 | [diff] [blame] | 86 | /* |
| 87 | * Some FS driver (local:mapped-file) can't support fetching attributes |
| 88 | * using file descriptor. Use Path name in that case. |
| 89 | */ |
| 90 | if (err == -EOPNOTSUPP) { |
| 91 | err = v9fs_co_lstat(pdu, &fidp->path, stbuf); |
| 92 | if (err == -ENOENT) { |
| 93 | /* |
| 94 | * fstat on an unlinked file. Work with partial results |
| 95 | * returned from s->ops->fstat |
| 96 | */ |
| 97 | err = 0; |
| 98 | } |
| 99 | } |
Aneesh Kumar K.V | 03feb1e | 2011-08-22 09:14:04 +0530 | [diff] [blame] | 100 | return err; |
| 101 | } |
Aneesh Kumar K.V | f6b7f0a | 2011-05-07 18:12:42 +0530 | [diff] [blame] | 102 | |
Greg Kurz | 5bdade6 | 2016-10-17 14:13:58 +0200 | [diff] [blame] | 103 | int coroutine_fn v9fs_co_open(V9fsPDU *pdu, V9fsFidState *fidp, int flags) |
Aneesh Kumar K.V | f6b7f0a | 2011-05-07 18:12:42 +0530 | [diff] [blame] | 104 | { |
| 105 | int err; |
Aneesh Kumar K.V | bccacf6 | 2011-08-02 11:36:17 +0530 | [diff] [blame] | 106 | V9fsState *s = pdu->s; |
Aneesh Kumar K.V | f6b7f0a | 2011-05-07 18:12:42 +0530 | [diff] [blame] | 107 | |
Aneesh Kumar K.V | bccacf6 | 2011-08-02 11:36:17 +0530 | [diff] [blame] | 108 | if (v9fs_request_cancelled(pdu)) { |
| 109 | return -EINTR; |
| 110 | } |
Aneesh Kumar K.V | 532decb | 2011-08-02 11:35:54 +0530 | [diff] [blame] | 111 | v9fs_path_read_lock(s); |
Aneesh Kumar K.V | f6b7f0a | 2011-05-07 18:12:42 +0530 | [diff] [blame] | 112 | v9fs_co_run_in_worker( |
| 113 | { |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 114 | err = s->ops->open(&s->ctx, &fidp->path, flags, &fidp->fs); |
| 115 | if (err == -1) { |
Aneesh Kumar K.V | f6b7f0a | 2011-05-07 18:12:42 +0530 | [diff] [blame] | 116 | err = -errno; |
| 117 | } else { |
| 118 | err = 0; |
| 119 | } |
| 120 | }); |
Aneesh Kumar K.V | 532decb | 2011-08-02 11:35:54 +0530 | [diff] [blame] | 121 | v9fs_path_unlock(s); |
Aneesh Kumar K.V | 7a46274 | 2011-05-18 15:40:57 +0530 | [diff] [blame] | 122 | if (!err) { |
| 123 | total_open_fd++; |
| 124 | if (total_open_fd > open_fd_hw) { |
Aneesh Kumar K.V | bccacf6 | 2011-08-02 11:36:17 +0530 | [diff] [blame] | 125 | v9fs_reclaim_fd(pdu); |
Aneesh Kumar K.V | 7a46274 | 2011-05-18 15:40:57 +0530 | [diff] [blame] | 126 | } |
| 127 | } |
Aneesh Kumar K.V | f6b7f0a | 2011-05-07 18:12:42 +0530 | [diff] [blame] | 128 | return err; |
| 129 | } |
Venkateswararao Jujjuri | e4de423 | 2011-08-08 23:52:33 +0530 | [diff] [blame] | 130 | |
Greg Kurz | 5bdade6 | 2016-10-17 14:13:58 +0200 | [diff] [blame] | 131 | int coroutine_fn v9fs_co_open2(V9fsPDU *pdu, V9fsFidState *fidp, |
| 132 | V9fsString *name, gid_t gid, int flags, int mode, |
| 133 | struct stat *stbuf) |
Venkateswararao Jujjuri | e4de423 | 2011-08-08 23:52:33 +0530 | [diff] [blame] | 134 | { |
| 135 | int err; |
| 136 | FsCred cred; |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 137 | V9fsPath path; |
Aneesh Kumar K.V | bccacf6 | 2011-08-02 11:36:17 +0530 | [diff] [blame] | 138 | V9fsState *s = pdu->s; |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 139 | |
Aneesh Kumar K.V | bccacf6 | 2011-08-02 11:36:17 +0530 | [diff] [blame] | 140 | if (v9fs_request_cancelled(pdu)) { |
| 141 | return -EINTR; |
| 142 | } |
Venkateswararao Jujjuri | e4de423 | 2011-08-08 23:52:33 +0530 | [diff] [blame] | 143 | cred_init(&cred); |
| 144 | cred.fc_mode = mode & 07777; |
| 145 | cred.fc_uid = fidp->uid; |
| 146 | cred.fc_gid = gid; |
Aneesh Kumar K.V | 02cb7f3 | 2011-05-24 15:10:56 +0530 | [diff] [blame] | 147 | /* |
| 148 | * Hold the directory fid lock so that directory path name |
Greg Kurz | 5b76ef5 | 2018-11-07 01:00:04 +0100 | [diff] [blame] | 149 | * don't change. Take the write lock to be sure this fid |
| 150 | * cannot be used by another operation. |
Aneesh Kumar K.V | 02cb7f3 | 2011-05-24 15:10:56 +0530 | [diff] [blame] | 151 | */ |
Greg Kurz | 5b76ef5 | 2018-11-07 01:00:04 +0100 | [diff] [blame] | 152 | v9fs_path_write_lock(s); |
Venkateswararao Jujjuri | e4de423 | 2011-08-08 23:52:33 +0530 | [diff] [blame] | 153 | v9fs_co_run_in_worker( |
| 154 | { |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 155 | err = s->ops->open2(&s->ctx, &fidp->path, |
| 156 | name->data, flags, &cred, &fidp->fs); |
| 157 | if (err < 0) { |
Venkateswararao Jujjuri | e4de423 | 2011-08-08 23:52:33 +0530 | [diff] [blame] | 158 | err = -errno; |
Aneesh Kumar K.V | 02cb7f3 | 2011-05-24 15:10:56 +0530 | [diff] [blame] | 159 | } else { |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 160 | v9fs_path_init(&path); |
| 161 | err = v9fs_name_to_path(s, &fidp->path, name->data, &path); |
| 162 | if (!err) { |
| 163 | err = s->ops->lstat(&s->ctx, &path, stbuf); |
| 164 | if (err < 0) { |
| 165 | err = -errno; |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 166 | s->ops->close(&s->ctx, &fidp->fs); |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 167 | } else { |
| 168 | v9fs_path_copy(&fidp->path, &path); |
| 169 | } |
Aneesh Kumar K.V | 02cb7f3 | 2011-05-24 15:10:56 +0530 | [diff] [blame] | 170 | } else { |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 171 | s->ops->close(&s->ctx, &fidp->fs); |
Aneesh Kumar K.V | 02cb7f3 | 2011-05-24 15:10:56 +0530 | [diff] [blame] | 172 | } |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 173 | v9fs_path_free(&path); |
Venkateswararao Jujjuri | e4de423 | 2011-08-08 23:52:33 +0530 | [diff] [blame] | 174 | } |
| 175 | }); |
Aneesh Kumar K.V | 532decb | 2011-08-02 11:35:54 +0530 | [diff] [blame] | 176 | v9fs_path_unlock(s); |
Aneesh Kumar K.V | 7a46274 | 2011-05-18 15:40:57 +0530 | [diff] [blame] | 177 | if (!err) { |
| 178 | total_open_fd++; |
| 179 | if (total_open_fd > open_fd_hw) { |
Aneesh Kumar K.V | bccacf6 | 2011-08-02 11:36:17 +0530 | [diff] [blame] | 180 | v9fs_reclaim_fd(pdu); |
Aneesh Kumar K.V | 7a46274 | 2011-05-18 15:40:57 +0530 | [diff] [blame] | 181 | } |
| 182 | } |
Venkateswararao Jujjuri | e4de423 | 2011-08-08 23:52:33 +0530 | [diff] [blame] | 183 | return err; |
| 184 | } |
Aneesh Kumar K.V | bed4352 | 2011-05-07 21:09:24 +0530 | [diff] [blame] | 185 | |
Greg Kurz | 5bdade6 | 2016-10-17 14:13:58 +0200 | [diff] [blame] | 186 | int coroutine_fn v9fs_co_close(V9fsPDU *pdu, V9fsFidOpenState *fs) |
Aneesh Kumar K.V | bed4352 | 2011-05-07 21:09:24 +0530 | [diff] [blame] | 187 | { |
Aneesh Kumar K.V | bed4352 | 2011-05-07 21:09:24 +0530 | [diff] [blame] | 188 | int err; |
Aneesh Kumar K.V | bccacf6 | 2011-08-02 11:36:17 +0530 | [diff] [blame] | 189 | V9fsState *s = pdu->s; |
Aneesh Kumar K.V | bed4352 | 2011-05-07 21:09:24 +0530 | [diff] [blame] | 190 | |
Aneesh Kumar K.V | bccacf6 | 2011-08-02 11:36:17 +0530 | [diff] [blame] | 191 | if (v9fs_request_cancelled(pdu)) { |
| 192 | return -EINTR; |
| 193 | } |
Aneesh Kumar K.V | bed4352 | 2011-05-07 21:09:24 +0530 | [diff] [blame] | 194 | v9fs_co_run_in_worker( |
| 195 | { |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 196 | err = s->ops->close(&s->ctx, fs); |
Aneesh Kumar K.V | bed4352 | 2011-05-07 21:09:24 +0530 | [diff] [blame] | 197 | if (err < 0) { |
| 198 | err = -errno; |
| 199 | } |
| 200 | }); |
Aneesh Kumar K.V | 7a46274 | 2011-05-18 15:40:57 +0530 | [diff] [blame] | 201 | if (!err) { |
| 202 | total_open_fd--; |
| 203 | } |
Aneesh Kumar K.V | bed4352 | 2011-05-07 21:09:24 +0530 | [diff] [blame] | 204 | return err; |
| 205 | } |
Aneesh Kumar K.V | 4743d1f | 2011-05-07 21:29:32 +0530 | [diff] [blame] | 206 | |
Greg Kurz | 5bdade6 | 2016-10-17 14:13:58 +0200 | [diff] [blame] | 207 | int coroutine_fn v9fs_co_fsync(V9fsPDU *pdu, V9fsFidState *fidp, int datasync) |
Aneesh Kumar K.V | 4743d1f | 2011-05-07 21:29:32 +0530 | [diff] [blame] | 208 | { |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 209 | int err; |
Aneesh Kumar K.V | bccacf6 | 2011-08-02 11:36:17 +0530 | [diff] [blame] | 210 | V9fsState *s = pdu->s; |
Aneesh Kumar K.V | 4743d1f | 2011-05-07 21:29:32 +0530 | [diff] [blame] | 211 | |
Aneesh Kumar K.V | bccacf6 | 2011-08-02 11:36:17 +0530 | [diff] [blame] | 212 | if (v9fs_request_cancelled(pdu)) { |
| 213 | return -EINTR; |
| 214 | } |
Aneesh Kumar K.V | 4743d1f | 2011-05-07 21:29:32 +0530 | [diff] [blame] | 215 | v9fs_co_run_in_worker( |
| 216 | { |
Aneesh Kumar K.V | 8b88827 | 2011-12-04 22:35:28 +0530 | [diff] [blame] | 217 | err = s->ops->fsync(&s->ctx, fidp->fid_type, &fidp->fs, datasync); |
Aneesh Kumar K.V | 4743d1f | 2011-05-07 21:29:32 +0530 | [diff] [blame] | 218 | if (err < 0) { |
| 219 | err = -errno; |
| 220 | } |
| 221 | }); |
| 222 | return err; |
| 223 | } |
Venkateswararao Jujjuri | c6c069b | 2011-08-09 00:01:22 +0530 | [diff] [blame] | 224 | |
Greg Kurz | 5bdade6 | 2016-10-17 14:13:58 +0200 | [diff] [blame] | 225 | int coroutine_fn v9fs_co_link(V9fsPDU *pdu, V9fsFidState *oldfid, |
| 226 | V9fsFidState *newdirfid, V9fsString *name) |
Venkateswararao Jujjuri | c6c069b | 2011-08-09 00:01:22 +0530 | [diff] [blame] | 227 | { |
| 228 | int err; |
Aneesh Kumar K.V | bccacf6 | 2011-08-02 11:36:17 +0530 | [diff] [blame] | 229 | V9fsState *s = pdu->s; |
Venkateswararao Jujjuri | c6c069b | 2011-08-09 00:01:22 +0530 | [diff] [blame] | 230 | |
Aneesh Kumar K.V | bccacf6 | 2011-08-02 11:36:17 +0530 | [diff] [blame] | 231 | if (v9fs_request_cancelled(pdu)) { |
| 232 | return -EINTR; |
| 233 | } |
Aneesh Kumar K.V | 532decb | 2011-08-02 11:35:54 +0530 | [diff] [blame] | 234 | v9fs_path_read_lock(s); |
Venkateswararao Jujjuri | c6c069b | 2011-08-09 00:01:22 +0530 | [diff] [blame] | 235 | v9fs_co_run_in_worker( |
| 236 | { |
Aneesh Kumar K.V | 2289be1 | 2011-09-09 15:14:18 +0530 | [diff] [blame] | 237 | err = s->ops->link(&s->ctx, &oldfid->path, |
| 238 | &newdirfid->path, name->data); |
Venkateswararao Jujjuri | c6c069b | 2011-08-09 00:01:22 +0530 | [diff] [blame] | 239 | if (err < 0) { |
| 240 | err = -errno; |
| 241 | } |
| 242 | }); |
Aneesh Kumar K.V | 532decb | 2011-08-02 11:35:54 +0530 | [diff] [blame] | 243 | v9fs_path_unlock(s); |
Venkateswararao Jujjuri | c6c069b | 2011-08-09 00:01:22 +0530 | [diff] [blame] | 244 | return err; |
| 245 | } |
Aneesh Kumar K.V | f6b3c97 | 2011-05-08 12:36:59 +0530 | [diff] [blame] | 246 | |
Greg Kurz | 5bdade6 | 2016-10-17 14:13:58 +0200 | [diff] [blame] | 247 | int coroutine_fn v9fs_co_pwritev(V9fsPDU *pdu, V9fsFidState *fidp, |
| 248 | struct iovec *iov, int iovcnt, int64_t offset) |
Aneesh Kumar K.V | f6b3c97 | 2011-05-08 12:36:59 +0530 | [diff] [blame] | 249 | { |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 250 | int err; |
Aneesh Kumar K.V | bccacf6 | 2011-08-02 11:36:17 +0530 | [diff] [blame] | 251 | V9fsState *s = pdu->s; |
Aneesh Kumar K.V | f6b3c97 | 2011-05-08 12:36:59 +0530 | [diff] [blame] | 252 | |
Aneesh Kumar K.V | bccacf6 | 2011-08-02 11:36:17 +0530 | [diff] [blame] | 253 | if (v9fs_request_cancelled(pdu)) { |
| 254 | return -EINTR; |
| 255 | } |
Pradeep Jagadeesh | b8bbdb8 | 2017-02-28 10:31:46 +0100 | [diff] [blame] | 256 | fsdev_co_throttle_request(s->ctx.fst, true, iov, iovcnt); |
Aneesh Kumar K.V | f6b3c97 | 2011-05-08 12:36:59 +0530 | [diff] [blame] | 257 | v9fs_co_run_in_worker( |
| 258 | { |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 259 | err = s->ops->pwritev(&s->ctx, &fidp->fs, iov, iovcnt, offset); |
Aneesh Kumar K.V | f6b3c97 | 2011-05-08 12:36:59 +0530 | [diff] [blame] | 260 | if (err < 0) { |
| 261 | err = -errno; |
| 262 | } |
| 263 | }); |
| 264 | return err; |
| 265 | } |
Aneesh Kumar K.V | 7eafdcc | 2011-05-08 15:16:22 +0530 | [diff] [blame] | 266 | |
Greg Kurz | 5bdade6 | 2016-10-17 14:13:58 +0200 | [diff] [blame] | 267 | int coroutine_fn v9fs_co_preadv(V9fsPDU *pdu, V9fsFidState *fidp, |
| 268 | struct iovec *iov, int iovcnt, int64_t offset) |
Aneesh Kumar K.V | 7eafdcc | 2011-05-08 15:16:22 +0530 | [diff] [blame] | 269 | { |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 270 | int err; |
Aneesh Kumar K.V | bccacf6 | 2011-08-02 11:36:17 +0530 | [diff] [blame] | 271 | V9fsState *s = pdu->s; |
Aneesh Kumar K.V | 7eafdcc | 2011-05-08 15:16:22 +0530 | [diff] [blame] | 272 | |
Aneesh Kumar K.V | bccacf6 | 2011-08-02 11:36:17 +0530 | [diff] [blame] | 273 | if (v9fs_request_cancelled(pdu)) { |
| 274 | return -EINTR; |
| 275 | } |
Pradeep Jagadeesh | b8bbdb8 | 2017-02-28 10:31:46 +0100 | [diff] [blame] | 276 | fsdev_co_throttle_request(s->ctx.fst, false, iov, iovcnt); |
Aneesh Kumar K.V | 7eafdcc | 2011-05-08 15:16:22 +0530 | [diff] [blame] | 277 | v9fs_co_run_in_worker( |
| 278 | { |
Aneesh Kumar K.V | cc720dd | 2011-10-25 12:10:40 +0530 | [diff] [blame] | 279 | err = s->ops->preadv(&s->ctx, &fidp->fs, iov, iovcnt, offset); |
Aneesh Kumar K.V | 7eafdcc | 2011-05-08 15:16:22 +0530 | [diff] [blame] | 280 | if (err < 0) { |
| 281 | err = -errno; |
| 282 | } |
| 283 | }); |
| 284 | return err; |
| 285 | } |