2  * 9p backend
10  * the COPYING file in the top-level directory.
15  * Not so fast! You might want to read the 9p developer docs first:
16  * https://wiki.qemu.org/Documentation/9p
20 #include "fsdev/qemu-fsdev.h"
22 #include "qemu/main-loop.h"
23 #include "qemu/error-report.h"
25 #include "9p-xattr.h"
26 #include "9p-util.h"
29  * Intended to be called from bottom-half (e.g. background I/O thread)
34     int err = 0;  in do_readdir()
35     V9fsState *s = pdu->s;  in do_readdir()
38     errno = 0;  in do_readdir()
39     entry = s->ops->readdir(&s->ctx, &fidp->fs);  in do_readdir()
42         err = -errno;  in do_readdir()
59         return -EINTR;  in v9fs_co_readdir()
76     V9fsState *s = pdu->s;  in do_readdir_many()
78     int len, err = 0;  in do_readdir_many()
79     int32_t size = 0;  in do_readdir_many()
92      * With a good 9p client we should not get into concurrency here,  in do_readdir_many()
98     v9fs_readdir_lock(&fidp->fs.dir);  in do_readdir_many()
101     if (offset == 0) {  in do_readdir_many()
102         s->ops->rewinddir(&s->ctx, &fidp->fs);  in do_readdir_many()
104         s->ops->seekdir(&s->ctx, &fidp->fs, offset);  in do_readdir_many()
108     saved_dir_pos = s->ops->telldir(&s->ctx, &fidp->fs);  in do_readdir_many()
109     if (saved_dir_pos < 0) {  in do_readdir_many()
117             err = -EINTR;  in do_readdir_many()
131          * 9p controller (main thread / top half) anyway  in do_readdir_many()
134         v9fs_string_sprintf(&name, "%s", dent->d_name);  in do_readdir_many()
146             e = e->next = g_new0(V9fsDirEnt, 1);  in do_readdir_many()
148         e->dent = qemu_dirent_dup(dent);  in do_readdir_many()
152             err = s->ops->name_to_path(  in do_readdir_many()
153                 &s->ctx, &fidp->path, dent->d_name, &path  in do_readdir_many()
155             if (err < 0) {  in do_readdir_many()
156                 err = -errno;  in do_readdir_many()
160             err = s->ops->lstat(&s->ctx, &path, &stbuf);  in do_readdir_many()
161             if (err < 0) {  in do_readdir_many()
162                 err = -errno;  in do_readdir_many()
166             e->st = g_new0(struct stat, 1);  in do_readdir_many()
167             memcpy(e->st, &stbuf, sizeof(struct stat));  in do_readdir_many()
175     s->ops->seekdir(&s->ctx, &fidp->fs, saved_dir_pos);  in do_readdir_many()
178     v9fs_readdir_unlock(&fidp->fs.dir);  in do_readdir_many()
180     if (err < 0) {  in do_readdir_many()
187  * v9fs_co_readdir_many() - Reads multiple directory entries in one rush.
189  * @pdu: the causing 9p (T_readdir) client request
222     int err = 0;  in v9fs_co_readdir_many()
225         return -EINTR;  in v9fs_co_readdir_many()
236     V9fsState *s = pdu->s;  in v9fs_co_telldir()
239         return -EINTR;  in v9fs_co_telldir()
243             err = s->ops->telldir(&s->ctx, &fidp->fs);  in v9fs_co_telldir()
244             if (err < 0) {  in v9fs_co_telldir()
245                 err = -errno;  in v9fs_co_telldir()
254     V9fsState *s = pdu->s;  in v9fs_co_seekdir()
260             s->ops->seekdir(&s->ctx, &fidp->fs, offset);  in v9fs_co_seekdir()
266     V9fsState *s = pdu->s;  in v9fs_co_rewinddir()
272             s->ops->rewinddir(&s->ctx, &fidp->fs);  in v9fs_co_rewinddir()
283     V9fsState *s = pdu->s;  in v9fs_co_mkdir()
286         return -EINTR;  in v9fs_co_mkdir()
295             err = s->ops->mkdir(&s->ctx, &fidp->path, name->data,  &cred);  in v9fs_co_mkdir()
296             if (err < 0) {  in v9fs_co_mkdir()
297                 err = -errno;  in v9fs_co_mkdir()
300                 err = v9fs_name_to_path(s, &fidp->path, name->data, &path);  in v9fs_co_mkdir()
302                     err = s->ops->lstat(&s->ctx, &path, stbuf);  in v9fs_co_mkdir()
303                     if (err < 0) {  in v9fs_co_mkdir()
304                         err = -errno;  in v9fs_co_mkdir()
317     V9fsState *s = pdu->s;  in v9fs_co_opendir()
320         return -EINTR;  in v9fs_co_opendir()
325             err = s->ops->opendir(&s->ctx, &fidp->path, &fidp->fs);  in v9fs_co_opendir()
326             if (err < 0) {  in v9fs_co_opendir()
327                 err = -errno;  in v9fs_co_opendir()
329                 err = 0;  in v9fs_co_opendir()
345     V9fsState *s = pdu->s;  in v9fs_co_closedir()
348         return -EINTR;  in v9fs_co_closedir()
352             err = s->ops->closedir(&s->ctx, fs);  in v9fs_co_closedir()
353             if (err < 0) {  in v9fs_co_closedir()
354                 err = -errno;  in v9fs_co_closedir()
360         error_report("9pfs: WARNING: v9fs_co_closedir() failed with EBADF");  in v9fs_co_closedir()
362         total_open_fd--;  in v9fs_co_closedir()