root / hw / 9pfs / cofile.c @ 39f8c32c
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| 1 | 172198d4 | Aneesh Kumar K.V | |
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| 2 | 172198d4 | Aneesh Kumar K.V | /*
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| 3 | 172198d4 | Aneesh Kumar K.V | * Virtio 9p backend
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| 4 | 172198d4 | Aneesh Kumar K.V | *
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| 5 | 172198d4 | Aneesh Kumar K.V | * Copyright IBM, Corp. 2011
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| 6 | 172198d4 | Aneesh Kumar K.V | *
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| 7 | 172198d4 | Aneesh Kumar K.V | * Authors:
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| 8 | 172198d4 | Aneesh Kumar K.V | * Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
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| 9 | 172198d4 | Aneesh Kumar K.V | *
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| 10 | 172198d4 | Aneesh Kumar K.V | * This work is licensed under the terms of the GNU GPL, version 2. See
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| 11 | 172198d4 | Aneesh Kumar K.V | * the COPYING file in the top-level directory.
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| 12 | 172198d4 | Aneesh Kumar K.V | *
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| 13 | 172198d4 | Aneesh Kumar K.V | */
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| 14 | 172198d4 | Aneesh Kumar K.V | |
| 15 | 172198d4 | Aneesh Kumar K.V | #include "fsdev/qemu-fsdev.h" |
| 16 | 172198d4 | Aneesh Kumar K.V | #include "qemu-thread.h" |
| 17 | 172198d4 | Aneesh Kumar K.V | #include "qemu-coroutine.h" |
| 18 | 172198d4 | Aneesh Kumar K.V | #include "virtio-9p-coth.h" |
| 19 | 172198d4 | Aneesh Kumar K.V | |
| 20 | e06a765e | Harsh Prateek Bora | int v9fs_co_st_gen(V9fsPDU *pdu, V9fsPath *path, mode_t st_mode,
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| 21 | e06a765e | Harsh Prateek Bora | V9fsStatDotl *v9stat) |
| 22 | e06a765e | Harsh Prateek Bora | {
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| 23 | e06a765e | Harsh Prateek Bora | int err = 0; |
| 24 | e06a765e | Harsh Prateek Bora | V9fsState *s = pdu->s; |
| 25 | e06a765e | Harsh Prateek Bora | |
| 26 | e06a765e | Harsh Prateek Bora | if (v9fs_request_cancelled(pdu)) {
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| 27 | e06a765e | Harsh Prateek Bora | return -EINTR;
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| 28 | e06a765e | Harsh Prateek Bora | } |
| 29 | e06a765e | Harsh Prateek Bora | if (s->ctx.exops.get_st_gen) {
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| 30 | e06a765e | Harsh Prateek Bora | v9fs_path_read_lock(s); |
| 31 | e06a765e | Harsh Prateek Bora | v9fs_co_run_in_worker( |
| 32 | e06a765e | Harsh Prateek Bora | {
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| 33 | e06a765e | Harsh Prateek Bora | err = s->ctx.exops.get_st_gen(&s->ctx, path, st_mode, |
| 34 | e06a765e | Harsh Prateek Bora | &v9stat->st_gen); |
| 35 | e06a765e | Harsh Prateek Bora | if (err < 0) { |
| 36 | e06a765e | Harsh Prateek Bora | err = -errno; |
| 37 | e06a765e | Harsh Prateek Bora | } |
| 38 | e06a765e | Harsh Prateek Bora | }); |
| 39 | e06a765e | Harsh Prateek Bora | v9fs_path_unlock(s); |
| 40 | e06a765e | Harsh Prateek Bora | } |
| 41 | e06a765e | Harsh Prateek Bora | return err;
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| 42 | e06a765e | Harsh Prateek Bora | } |
| 43 | e06a765e | Harsh Prateek Bora | |
| 44 | bccacf6c | Aneesh Kumar K.V | int v9fs_co_lstat(V9fsPDU *pdu, V9fsPath *path, struct stat *stbuf) |
| 45 | 172198d4 | Aneesh Kumar K.V | {
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| 46 | 172198d4 | Aneesh Kumar K.V | int err;
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| 47 | bccacf6c | Aneesh Kumar K.V | V9fsState *s = pdu->s; |
| 48 | 172198d4 | Aneesh Kumar K.V | |
| 49 | bccacf6c | Aneesh Kumar K.V | if (v9fs_request_cancelled(pdu)) {
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| 50 | bccacf6c | Aneesh Kumar K.V | return -EINTR;
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| 51 | bccacf6c | Aneesh Kumar K.V | } |
| 52 | 532decb7 | Aneesh Kumar K.V | v9fs_path_read_lock(s); |
| 53 | 172198d4 | Aneesh Kumar K.V | v9fs_co_run_in_worker( |
| 54 | 172198d4 | Aneesh Kumar K.V | {
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| 55 | 2289be19 | Aneesh Kumar K.V | err = s->ops->lstat(&s->ctx, path, stbuf); |
| 56 | 172198d4 | Aneesh Kumar K.V | if (err < 0) { |
| 57 | 172198d4 | Aneesh Kumar K.V | err = -errno; |
| 58 | 172198d4 | Aneesh Kumar K.V | } |
| 59 | 172198d4 | Aneesh Kumar K.V | }); |
| 60 | 532decb7 | Aneesh Kumar K.V | v9fs_path_unlock(s); |
| 61 | 172198d4 | Aneesh Kumar K.V | return err;
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| 62 | 172198d4 | Aneesh Kumar K.V | } |
| 63 | 03feb1e1 | Aneesh Kumar K.V | |
| 64 | cc720ddb | Aneesh Kumar K.V | int v9fs_co_fstat(V9fsPDU *pdu, V9fsFidState *fidp, struct stat *stbuf) |
| 65 | 03feb1e1 | Aneesh Kumar K.V | {
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| 66 | 03feb1e1 | Aneesh Kumar K.V | int err;
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| 67 | bccacf6c | Aneesh Kumar K.V | V9fsState *s = pdu->s; |
| 68 | 03feb1e1 | Aneesh Kumar K.V | |
| 69 | bccacf6c | Aneesh Kumar K.V | if (v9fs_request_cancelled(pdu)) {
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| 70 | bccacf6c | Aneesh Kumar K.V | return -EINTR;
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| 71 | bccacf6c | Aneesh Kumar K.V | } |
| 72 | 03feb1e1 | Aneesh Kumar K.V | v9fs_co_run_in_worker( |
| 73 | 03feb1e1 | Aneesh Kumar K.V | {
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| 74 | 8b888272 | Aneesh Kumar K.V | err = s->ops->fstat(&s->ctx, fidp->fid_type, &fidp->fs, stbuf); |
| 75 | 03feb1e1 | Aneesh Kumar K.V | if (err < 0) { |
| 76 | 03feb1e1 | Aneesh Kumar K.V | err = -errno; |
| 77 | 03feb1e1 | Aneesh Kumar K.V | } |
| 78 | 03feb1e1 | Aneesh Kumar K.V | }); |
| 79 | 03feb1e1 | Aneesh Kumar K.V | return err;
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| 80 | 03feb1e1 | Aneesh Kumar K.V | } |
| 81 | f6b7f0ab | Aneesh Kumar K.V | |
| 82 | bccacf6c | Aneesh Kumar K.V | int v9fs_co_open(V9fsPDU *pdu, V9fsFidState *fidp, int flags) |
| 83 | f6b7f0ab | Aneesh Kumar K.V | {
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| 84 | f6b7f0ab | Aneesh Kumar K.V | int err;
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| 85 | bccacf6c | Aneesh Kumar K.V | V9fsState *s = pdu->s; |
| 86 | f6b7f0ab | Aneesh Kumar K.V | |
| 87 | bccacf6c | Aneesh Kumar K.V | if (v9fs_request_cancelled(pdu)) {
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| 88 | bccacf6c | Aneesh Kumar K.V | return -EINTR;
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| 89 | bccacf6c | Aneesh Kumar K.V | } |
| 90 | 532decb7 | Aneesh Kumar K.V | v9fs_path_read_lock(s); |
| 91 | f6b7f0ab | Aneesh Kumar K.V | v9fs_co_run_in_worker( |
| 92 | f6b7f0ab | Aneesh Kumar K.V | {
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| 93 | cc720ddb | Aneesh Kumar K.V | err = s->ops->open(&s->ctx, &fidp->path, flags, &fidp->fs); |
| 94 | cc720ddb | Aneesh Kumar K.V | if (err == -1) { |
| 95 | f6b7f0ab | Aneesh Kumar K.V | err = -errno; |
| 96 | f6b7f0ab | Aneesh Kumar K.V | } else {
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| 97 | f6b7f0ab | Aneesh Kumar K.V | err = 0;
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| 98 | f6b7f0ab | Aneesh Kumar K.V | } |
| 99 | f6b7f0ab | Aneesh Kumar K.V | }); |
| 100 | 532decb7 | Aneesh Kumar K.V | v9fs_path_unlock(s); |
| 101 | 7a462745 | Aneesh Kumar K.V | if (!err) {
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| 102 | 7a462745 | Aneesh Kumar K.V | total_open_fd++; |
| 103 | 7a462745 | Aneesh Kumar K.V | if (total_open_fd > open_fd_hw) {
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| 104 | bccacf6c | Aneesh Kumar K.V | v9fs_reclaim_fd(pdu); |
| 105 | 7a462745 | Aneesh Kumar K.V | } |
| 106 | 7a462745 | Aneesh Kumar K.V | } |
| 107 | f6b7f0ab | Aneesh Kumar K.V | return err;
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| 108 | f6b7f0ab | Aneesh Kumar K.V | } |
| 109 | e4de4232 | Venkateswararao Jujjuri | |
| 110 | bccacf6c | Aneesh Kumar K.V | int v9fs_co_open2(V9fsPDU *pdu, V9fsFidState *fidp, V9fsString *name, gid_t gid,
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| 111 | 02cb7f3a | Aneesh Kumar K.V | int flags, int mode, struct stat *stbuf) |
| 112 | e4de4232 | Venkateswararao Jujjuri | {
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| 113 | e4de4232 | Venkateswararao Jujjuri | int err;
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| 114 | e4de4232 | Venkateswararao Jujjuri | FsCred cred; |
| 115 | 2289be19 | Aneesh Kumar K.V | V9fsPath path; |
| 116 | bccacf6c | Aneesh Kumar K.V | V9fsState *s = pdu->s; |
| 117 | 2289be19 | Aneesh Kumar K.V | |
| 118 | bccacf6c | Aneesh Kumar K.V | if (v9fs_request_cancelled(pdu)) {
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| 119 | bccacf6c | Aneesh Kumar K.V | return -EINTR;
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| 120 | bccacf6c | Aneesh Kumar K.V | } |
| 121 | e4de4232 | Venkateswararao Jujjuri | cred_init(&cred); |
| 122 | e4de4232 | Venkateswararao Jujjuri | cred.fc_mode = mode & 07777;
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| 123 | e4de4232 | Venkateswararao Jujjuri | cred.fc_uid = fidp->uid; |
| 124 | e4de4232 | Venkateswararao Jujjuri | cred.fc_gid = gid; |
| 125 | 02cb7f3a | Aneesh Kumar K.V | /*
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| 126 | 02cb7f3a | Aneesh Kumar K.V | * Hold the directory fid lock so that directory path name
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| 127 | 02cb7f3a | Aneesh Kumar K.V | * don't change. Read lock is fine because this fid cannot
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| 128 | 02cb7f3a | Aneesh Kumar K.V | * be used by any other operation.
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| 129 | 02cb7f3a | Aneesh Kumar K.V | */
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| 130 | 532decb7 | Aneesh Kumar K.V | v9fs_path_read_lock(s); |
| 131 | e4de4232 | Venkateswararao Jujjuri | v9fs_co_run_in_worker( |
| 132 | e4de4232 | Venkateswararao Jujjuri | {
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| 133 | cc720ddb | Aneesh Kumar K.V | err = s->ops->open2(&s->ctx, &fidp->path, |
| 134 | cc720ddb | Aneesh Kumar K.V | name->data, flags, &cred, &fidp->fs); |
| 135 | cc720ddb | Aneesh Kumar K.V | if (err < 0) { |
| 136 | e4de4232 | Venkateswararao Jujjuri | err = -errno; |
| 137 | 02cb7f3a | Aneesh Kumar K.V | } else {
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| 138 | 2289be19 | Aneesh Kumar K.V | v9fs_path_init(&path); |
| 139 | 2289be19 | Aneesh Kumar K.V | err = v9fs_name_to_path(s, &fidp->path, name->data, &path); |
| 140 | 2289be19 | Aneesh Kumar K.V | if (!err) {
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| 141 | 2289be19 | Aneesh Kumar K.V | err = s->ops->lstat(&s->ctx, &path, stbuf); |
| 142 | 2289be19 | Aneesh Kumar K.V | if (err < 0) { |
| 143 | 2289be19 | Aneesh Kumar K.V | err = -errno; |
| 144 | cc720ddb | Aneesh Kumar K.V | s->ops->close(&s->ctx, &fidp->fs); |
| 145 | 2289be19 | Aneesh Kumar K.V | } else {
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| 146 | 2289be19 | Aneesh Kumar K.V | v9fs_path_copy(&fidp->path, &path); |
| 147 | 2289be19 | Aneesh Kumar K.V | } |
| 148 | 02cb7f3a | Aneesh Kumar K.V | } else {
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| 149 | cc720ddb | Aneesh Kumar K.V | s->ops->close(&s->ctx, &fidp->fs); |
| 150 | 02cb7f3a | Aneesh Kumar K.V | } |
| 151 | 2289be19 | Aneesh Kumar K.V | v9fs_path_free(&path); |
| 152 | e4de4232 | Venkateswararao Jujjuri | } |
| 153 | e4de4232 | Venkateswararao Jujjuri | }); |
| 154 | 532decb7 | Aneesh Kumar K.V | v9fs_path_unlock(s); |
| 155 | 7a462745 | Aneesh Kumar K.V | if (!err) {
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| 156 | 7a462745 | Aneesh Kumar K.V | total_open_fd++; |
| 157 | 7a462745 | Aneesh Kumar K.V | if (total_open_fd > open_fd_hw) {
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| 158 | bccacf6c | Aneesh Kumar K.V | v9fs_reclaim_fd(pdu); |
| 159 | 7a462745 | Aneesh Kumar K.V | } |
| 160 | 7a462745 | Aneesh Kumar K.V | } |
| 161 | e4de4232 | Venkateswararao Jujjuri | return err;
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| 162 | e4de4232 | Venkateswararao Jujjuri | } |
| 163 | bed4352c | Aneesh Kumar K.V | |
| 164 | cc720ddb | Aneesh Kumar K.V | int v9fs_co_close(V9fsPDU *pdu, V9fsFidOpenState *fs)
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| 165 | bed4352c | Aneesh Kumar K.V | {
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| 166 | bed4352c | Aneesh Kumar K.V | int err;
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| 167 | bccacf6c | Aneesh Kumar K.V | V9fsState *s = pdu->s; |
| 168 | bed4352c | Aneesh Kumar K.V | |
| 169 | bccacf6c | Aneesh Kumar K.V | if (v9fs_request_cancelled(pdu)) {
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| 170 | bccacf6c | Aneesh Kumar K.V | return -EINTR;
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| 171 | bccacf6c | Aneesh Kumar K.V | } |
| 172 | bed4352c | Aneesh Kumar K.V | v9fs_co_run_in_worker( |
| 173 | bed4352c | Aneesh Kumar K.V | {
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| 174 | cc720ddb | Aneesh Kumar K.V | err = s->ops->close(&s->ctx, fs); |
| 175 | bed4352c | Aneesh Kumar K.V | if (err < 0) { |
| 176 | bed4352c | Aneesh Kumar K.V | err = -errno; |
| 177 | bed4352c | Aneesh Kumar K.V | } |
| 178 | bed4352c | Aneesh Kumar K.V | }); |
| 179 | 7a462745 | Aneesh Kumar K.V | if (!err) {
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| 180 | 7a462745 | Aneesh Kumar K.V | total_open_fd--; |
| 181 | 7a462745 | Aneesh Kumar K.V | } |
| 182 | bed4352c | Aneesh Kumar K.V | return err;
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| 183 | bed4352c | Aneesh Kumar K.V | } |
| 184 | 4743d1f5 | Aneesh Kumar K.V | |
| 185 | bccacf6c | Aneesh Kumar K.V | int v9fs_co_fsync(V9fsPDU *pdu, V9fsFidState *fidp, int datasync) |
| 186 | 4743d1f5 | Aneesh Kumar K.V | {
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| 187 | cc720ddb | Aneesh Kumar K.V | int err;
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| 188 | bccacf6c | Aneesh Kumar K.V | V9fsState *s = pdu->s; |
| 189 | 4743d1f5 | Aneesh Kumar K.V | |
| 190 | bccacf6c | Aneesh Kumar K.V | if (v9fs_request_cancelled(pdu)) {
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| 191 | bccacf6c | Aneesh Kumar K.V | return -EINTR;
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| 192 | bccacf6c | Aneesh Kumar K.V | } |
| 193 | 4743d1f5 | Aneesh Kumar K.V | v9fs_co_run_in_worker( |
| 194 | 4743d1f5 | Aneesh Kumar K.V | {
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| 195 | 8b888272 | Aneesh Kumar K.V | err = s->ops->fsync(&s->ctx, fidp->fid_type, &fidp->fs, datasync); |
| 196 | 4743d1f5 | Aneesh Kumar K.V | if (err < 0) { |
| 197 | 4743d1f5 | Aneesh Kumar K.V | err = -errno; |
| 198 | 4743d1f5 | Aneesh Kumar K.V | } |
| 199 | 4743d1f5 | Aneesh Kumar K.V | }); |
| 200 | 4743d1f5 | Aneesh Kumar K.V | return err;
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| 201 | 4743d1f5 | Aneesh Kumar K.V | } |
| 202 | c6c069b0 | Venkateswararao Jujjuri | |
| 203 | bccacf6c | Aneesh Kumar K.V | int v9fs_co_link(V9fsPDU *pdu, V9fsFidState *oldfid,
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| 204 | 2289be19 | Aneesh Kumar K.V | V9fsFidState *newdirfid, V9fsString *name) |
| 205 | c6c069b0 | Venkateswararao Jujjuri | {
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| 206 | c6c069b0 | Venkateswararao Jujjuri | int err;
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| 207 | bccacf6c | Aneesh Kumar K.V | V9fsState *s = pdu->s; |
| 208 | c6c069b0 | Venkateswararao Jujjuri | |
| 209 | bccacf6c | Aneesh Kumar K.V | if (v9fs_request_cancelled(pdu)) {
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| 210 | bccacf6c | Aneesh Kumar K.V | return -EINTR;
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| 211 | bccacf6c | Aneesh Kumar K.V | } |
| 212 | 532decb7 | Aneesh Kumar K.V | v9fs_path_read_lock(s); |
| 213 | c6c069b0 | Venkateswararao Jujjuri | v9fs_co_run_in_worker( |
| 214 | c6c069b0 | Venkateswararao Jujjuri | {
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| 215 | 2289be19 | Aneesh Kumar K.V | err = s->ops->link(&s->ctx, &oldfid->path, |
| 216 | 2289be19 | Aneesh Kumar K.V | &newdirfid->path, name->data); |
| 217 | c6c069b0 | Venkateswararao Jujjuri | if (err < 0) { |
| 218 | c6c069b0 | Venkateswararao Jujjuri | err = -errno; |
| 219 | c6c069b0 | Venkateswararao Jujjuri | } |
| 220 | c6c069b0 | Venkateswararao Jujjuri | }); |
| 221 | 532decb7 | Aneesh Kumar K.V | v9fs_path_unlock(s); |
| 222 | c6c069b0 | Venkateswararao Jujjuri | return err;
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| 223 | c6c069b0 | Venkateswararao Jujjuri | } |
| 224 | f6b3c976 | Aneesh Kumar K.V | |
| 225 | bccacf6c | Aneesh Kumar K.V | int v9fs_co_pwritev(V9fsPDU *pdu, V9fsFidState *fidp,
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| 226 | f6b3c976 | Aneesh Kumar K.V | struct iovec *iov, int iovcnt, int64_t offset) |
| 227 | f6b3c976 | Aneesh Kumar K.V | {
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| 228 | cc720ddb | Aneesh Kumar K.V | int err;
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| 229 | bccacf6c | Aneesh Kumar K.V | V9fsState *s = pdu->s; |
| 230 | f6b3c976 | Aneesh Kumar K.V | |
| 231 | bccacf6c | Aneesh Kumar K.V | if (v9fs_request_cancelled(pdu)) {
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| 232 | bccacf6c | Aneesh Kumar K.V | return -EINTR;
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| 233 | bccacf6c | Aneesh Kumar K.V | } |
| 234 | f6b3c976 | Aneesh Kumar K.V | v9fs_co_run_in_worker( |
| 235 | f6b3c976 | Aneesh Kumar K.V | {
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| 236 | cc720ddb | Aneesh Kumar K.V | err = s->ops->pwritev(&s->ctx, &fidp->fs, iov, iovcnt, offset); |
| 237 | f6b3c976 | Aneesh Kumar K.V | if (err < 0) { |
| 238 | f6b3c976 | Aneesh Kumar K.V | err = -errno; |
| 239 | f6b3c976 | Aneesh Kumar K.V | } |
| 240 | f6b3c976 | Aneesh Kumar K.V | }); |
| 241 | f6b3c976 | Aneesh Kumar K.V | return err;
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| 242 | f6b3c976 | Aneesh Kumar K.V | } |
| 243 | 7eafdcc9 | Aneesh Kumar K.V | |
| 244 | bccacf6c | Aneesh Kumar K.V | int v9fs_co_preadv(V9fsPDU *pdu, V9fsFidState *fidp,
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| 245 | 7eafdcc9 | Aneesh Kumar K.V | struct iovec *iov, int iovcnt, int64_t offset) |
| 246 | 7eafdcc9 | Aneesh Kumar K.V | {
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| 247 | cc720ddb | Aneesh Kumar K.V | int err;
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| 248 | bccacf6c | Aneesh Kumar K.V | V9fsState *s = pdu->s; |
| 249 | 7eafdcc9 | Aneesh Kumar K.V | |
| 250 | bccacf6c | Aneesh Kumar K.V | if (v9fs_request_cancelled(pdu)) {
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| 251 | bccacf6c | Aneesh Kumar K.V | return -EINTR;
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| 252 | bccacf6c | Aneesh Kumar K.V | } |
| 253 | 7eafdcc9 | Aneesh Kumar K.V | v9fs_co_run_in_worker( |
| 254 | 7eafdcc9 | Aneesh Kumar K.V | {
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| 255 | cc720ddb | Aneesh Kumar K.V | err = s->ops->preadv(&s->ctx, &fidp->fs, iov, iovcnt, offset); |
| 256 | 7eafdcc9 | Aneesh Kumar K.V | if (err < 0) { |
| 257 | 7eafdcc9 | Aneesh Kumar K.V | err = -errno; |
| 258 | 7eafdcc9 | Aneesh Kumar K.V | } |
| 259 | 7eafdcc9 | Aneesh Kumar K.V | }); |
| 260 | 7eafdcc9 | Aneesh Kumar K.V | return err;
|
| 261 | 7eafdcc9 | Aneesh Kumar K.V | } |