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