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9p: switch back to readdir() 

This patch changes the 9p code to use readdir() again instead of
readdir_r(), which is deprecated in glibc 2.24.

All the locking was put in place by a previous patch.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
This commit is contained in:
Greg Kurz 2016-06-06 11:52:34 +02:00
parent 7cde47d4a8
commit 635324e83e
9 changed files with 42 additions and 55 deletions
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3
fsdev/file-op-9p.h
View File

@ -118,8 +118,7 @@ struct FileOperations
int, FsCred *, V9fsFidOpenState *); int, FsCred *, V9fsFidOpenState *);
void (*rewinddir)(FsContext *, V9fsFidOpenState *); void (*rewinddir)(FsContext *, V9fsFidOpenState *);
off_t (*telldir)(FsContext *, V9fsFidOpenState *); off_t (*telldir)(FsContext *, V9fsFidOpenState *);
int (*readdir_r)(FsContext *, V9fsFidOpenState *, struct dirent * (*readdir)(FsContext *, V9fsFidOpenState *);
struct dirent *, struct dirent **);
void (*seekdir)(FsContext *, V9fsFidOpenState *, off_t); void (*seekdir)(FsContext *, V9fsFidOpenState *, off_t);
ssize_t (*preadv)(FsContext *, V9fsFidOpenState *, ssize_t (*preadv)(FsContext *, V9fsFidOpenState *,
const struct iovec *, int, off_t); const struct iovec *, int, off_t);

8
hw/9pfs/9p-handle.c
View File

@ -149,11 +149,9 @@ static off_t handle_telldir(FsContext *ctx, V9fsFidOpenState *fs)
return telldir(fs->dir.stream); return telldir(fs->dir.stream);
} }
static int handle_readdir_r(FsContext *ctx, V9fsFidOpenState *fs, static struct dirent *handle_readdir(FsContext *ctx, V9fsFidOpenState *fs)
struct dirent *entry,
struct dirent **result)
{ {
return readdir_r(fs->dir.stream, entry, result); return readdir(fs->dir.stream);
} }
static void handle_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off) static void handle_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
@ -681,7 +679,7 @@ FileOperations handle_ops = {
.opendir = handle_opendir, .opendir = handle_opendir,
.rewinddir = handle_rewinddir, .rewinddir = handle_rewinddir,
.telldir = handle_telldir, .telldir = handle_telldir,
.readdir_r = handle_readdir_r, .readdir = handle_readdir,
.seekdir = handle_seekdir, .seekdir = handle_seekdir,
.preadv = handle_preadv, .preadv = handle_preadv,
.pwritev = handle_pwritev, .pwritev = handle_pwritev,

20
hw/9pfs/9p-local.c
View File

@ -388,25 +388,27 @@ static off_t local_telldir(FsContext *ctx, V9fsFidOpenState *fs)
return telldir(fs->dir.stream); return telldir(fs->dir.stream);
} }
static int local_readdir_r(FsContext *ctx, V9fsFidOpenState *fs, static struct dirent *local_readdir(FsContext *ctx, V9fsFidOpenState *fs)
struct dirent *entry,
struct dirent **result)
{ {
int ret; struct dirent *entry;
again: again:
ret = readdir_r(fs->dir.stream, entry, result); entry = readdir(fs->dir.stream);
if (!entry) {
return NULL;
}
if (ctx->export_flags & V9FS_SM_MAPPED) { if (ctx->export_flags & V9FS_SM_MAPPED) {
entry->d_type = DT_UNKNOWN; entry->d_type = DT_UNKNOWN;
} else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
if (!ret && *result != NULL && if (!strcmp(entry->d_name, VIRTFS_META_DIR)) {
!strcmp(entry->d_name, VIRTFS_META_DIR)) {
/* skp the meta data directory */ /* skp the meta data directory */
goto again; goto again;
} }
entry->d_type = DT_UNKNOWN; entry->d_type = DT_UNKNOWN;
} }
return ret;
return entry;
} }
static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off) static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
@ -1254,7 +1256,7 @@ FileOperations local_ops = {
.opendir = local_opendir, .opendir = local_opendir,
.rewinddir = local_rewinddir, .rewinddir = local_rewinddir,
.telldir = local_telldir, .telldir = local_telldir,
.readdir_r = local_readdir_r, .readdir = local_readdir,
.seekdir = local_seekdir, .seekdir = local_seekdir,
.preadv = local_preadv, .preadv = local_preadv,
.pwritev = local_pwritev, .pwritev = local_pwritev,

8
hw/9pfs/9p-proxy.c
View File

@ -678,11 +678,9 @@ static off_t proxy_telldir(FsContext *ctx, V9fsFidOpenState *fs)
return telldir(fs->dir.stream); return telldir(fs->dir.stream);
} }
static int proxy_readdir_r(FsContext *ctx, V9fsFidOpenState *fs, static struct dirent *proxy_readdir(FsContext *ctx, V9fsFidOpenState *fs)
struct dirent *entry,
struct dirent **result)
{ {
return readdir_r(fs->dir.stream, entry, result); return readdir(fs->dir.stream);
} }
static void proxy_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off) static void proxy_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
@ -1192,7 +1190,7 @@ FileOperations proxy_ops = {
.opendir = proxy_opendir, .opendir = proxy_opendir,
.rewinddir = proxy_rewinddir, .rewinddir = proxy_rewinddir,
.telldir = proxy_telldir, .telldir = proxy_telldir,
.readdir_r = proxy_readdir_r, .readdir = proxy_readdir,
.seekdir = proxy_seekdir, .seekdir = proxy_seekdir,
.preadv = proxy_preadv, .preadv = proxy_preadv,
.pwritev = proxy_pwritev, .pwritev = proxy_pwritev,

23
hw/9pfs/9p-synth.c
View File

@ -223,8 +223,8 @@ static void v9fs_synth_direntry(V9fsSynthNode *node,
entry->d_off = off + 1; entry->d_off = off + 1;
} }
static int v9fs_synth_get_dentry(V9fsSynthNode *dir, struct dirent *entry, static struct dirent *v9fs_synth_get_dentry(V9fsSynthNode *dir,
struct dirent **result, off_t off) struct dirent *entry, off_t off)
{ {
int i = 0; int i = 0;
V9fsSynthNode *node; V9fsSynthNode *node;
@ -240,25 +240,22 @@ static int v9fs_synth_get_dentry(V9fsSynthNode *dir, struct dirent *entry,
rcu_read_unlock(); rcu_read_unlock();
if (!node) { if (!node) {
/* end of directory */ /* end of directory */
*result = NULL; return NULL;
return 0;
} }
v9fs_synth_direntry(node, entry, off); v9fs_synth_direntry(node, entry, off);
*result = entry; return entry;
return 0;
} }
static int v9fs_synth_readdir_r(FsContext *ctx, V9fsFidOpenState *fs, static struct dirent *v9fs_synth_readdir(FsContext *ctx, V9fsFidOpenState *fs)
struct dirent *entry, struct dirent **result)
{ {
int ret; struct dirent *entry;
V9fsSynthOpenState *synth_open = fs->private; V9fsSynthOpenState *synth_open = fs->private;
V9fsSynthNode *node = synth_open->node; V9fsSynthNode *node = synth_open->node;
ret = v9fs_synth_get_dentry(node, entry, result, synth_open->offset); entry = v9fs_synth_get_dentry(node, &synth_open->dent, synth_open->offset);
if (!ret && *result != NULL) { if (entry) {
synth_open->offset++; synth_open->offset++;
} }
return ret; return entry;
} }
static int v9fs_synth_open(FsContext *ctx, V9fsPath *fs_path, static int v9fs_synth_open(FsContext *ctx, V9fsPath *fs_path,
@ -544,7 +541,7 @@ FileOperations synth_ops = {
.opendir = v9fs_synth_opendir, .opendir = v9fs_synth_opendir,
.rewinddir = v9fs_synth_rewinddir, .rewinddir = v9fs_synth_rewinddir,
.telldir = v9fs_synth_telldir, .telldir = v9fs_synth_telldir,
.readdir_r = v9fs_synth_readdir_r, .readdir = v9fs_synth_readdir,
.seekdir = v9fs_synth_seekdir, .seekdir = v9fs_synth_seekdir,
.preadv = v9fs_synth_preadv, .preadv = v9fs_synth_preadv,
.pwritev = v9fs_synth_pwritev, .pwritev = v9fs_synth_pwritev,

1
hw/9pfs/9p-synth.h
View File

@ -40,6 +40,7 @@ struct V9fsSynthNode {
typedef struct V9fsSynthOpenState { typedef struct V9fsSynthOpenState {
off_t offset; off_t offset;
V9fsSynthNode *node; V9fsSynthNode *node;
struct dirent dent;
} V9fsSynthOpenState; } V9fsSynthOpenState;
extern int qemu_v9fs_synth_mkdir(V9fsSynthNode *parent, int mode, extern int qemu_v9fs_synth_mkdir(V9fsSynthNode *parent, int mode,

21
hw/9pfs/9p.c
View File

@ -1627,7 +1627,7 @@ static int v9fs_do_readdir_with_stat(V9fsPDU *pdu,
int32_t count = 0; int32_t count = 0;
struct stat stbuf; struct stat stbuf;
off_t saved_dir_pos; off_t saved_dir_pos;
struct dirent *dent, *result; struct dirent *dent;
/* save the directory position */ /* save the directory position */
saved_dir_pos = v9fs_co_telldir(pdu, fidp); saved_dir_pos = v9fs_co_telldir(pdu, fidp);
@ -1635,15 +1635,13 @@ static int v9fs_do_readdir_with_stat(V9fsPDU *pdu,
return saved_dir_pos; return saved_dir_pos;
} }
dent = g_malloc(sizeof(struct dirent));
while (1) { while (1) {
v9fs_path_init(&path); v9fs_path_init(&path);
v9fs_readdir_lock(&fidp->fs.dir); v9fs_readdir_lock(&fidp->fs.dir);
err = v9fs_co_readdir_r(pdu, fidp, dent, &result); err = v9fs_co_readdir(pdu, fidp, &dent);
if (err || !result) { if (err || !dent) {
break; break;
} }
err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path);
@ -1668,7 +1666,6 @@ static int v9fs_do_readdir_with_stat(V9fsPDU *pdu,
v9fs_co_seekdir(pdu, fidp, saved_dir_pos); v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
v9fs_stat_free(&v9stat); v9fs_stat_free(&v9stat);
v9fs_path_free(&path); v9fs_path_free(&path);
g_free(dent);
return count; return count;
} }
count += len; count += len;
@ -1679,7 +1676,6 @@ static int v9fs_do_readdir_with_stat(V9fsPDU *pdu,
v9fs_readdir_unlock(&fidp->fs.dir); v9fs_readdir_unlock(&fidp->fs.dir);
g_free(dent);
v9fs_path_free(&path); v9fs_path_free(&path);
if (err < 0) { if (err < 0) {
return err; return err;
@ -1815,7 +1811,7 @@ static int v9fs_do_readdir(V9fsPDU *pdu,
int len, err = 0; int len, err = 0;
int32_t count = 0; int32_t count = 0;
off_t saved_dir_pos; off_t saved_dir_pos;
struct dirent *dent, *result; struct dirent *dent;
/* save the directory position */ /* save the directory position */
saved_dir_pos = v9fs_co_telldir(pdu, fidp); saved_dir_pos = v9fs_co_telldir(pdu, fidp);
@ -1823,13 +1819,11 @@ static int v9fs_do_readdir(V9fsPDU *pdu,
return saved_dir_pos; return saved_dir_pos;
} }
dent = g_malloc(sizeof(struct dirent));
while (1) { while (1) {
v9fs_readdir_lock(&fidp->fs.dir); v9fs_readdir_lock(&fidp->fs.dir);
err = v9fs_co_readdir_r(pdu, fidp, dent, &result); err = v9fs_co_readdir(pdu, fidp, &dent);
if (err || !result) { if (err || !dent) {
break; break;
} }
v9fs_string_init(&name); v9fs_string_init(&name);
@ -1840,7 +1834,6 @@ static int v9fs_do_readdir(V9fsPDU *pdu,
/* Ran out of buffer. Set dir back to old position and return */ /* Ran out of buffer. Set dir back to old position and return */
v9fs_co_seekdir(pdu, fidp, saved_dir_pos); v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
v9fs_string_free(&name); v9fs_string_free(&name);
g_free(dent);
return count; return count;
} }
/* /*
@ -1864,7 +1857,6 @@ static int v9fs_do_readdir(V9fsPDU *pdu,
if (len < 0) { if (len < 0) {
v9fs_co_seekdir(pdu, fidp, saved_dir_pos); v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
v9fs_string_free(&name); v9fs_string_free(&name);
g_free(dent);
return len; return len;
} }
count += len; count += len;
@ -1874,7 +1866,6 @@ static int v9fs_do_readdir(V9fsPDU *pdu,
v9fs_readdir_unlock(&fidp->fs.dir); v9fs_readdir_unlock(&fidp->fs.dir);
g_free(dent);
if (err < 0) { if (err < 0) {
return err; return err;
} }

10
hw/9pfs/codir.c
View File

@ -17,8 +17,7 @@
#include "qemu/coroutine.h" #include "qemu/coroutine.h"
#include "coth.h" #include "coth.h"
int v9fs_co_readdir_r(V9fsPDU *pdu, V9fsFidState *fidp, struct dirent *dent, int v9fs_co_readdir(V9fsPDU *pdu, V9fsFidState *fidp, struct dirent **dent)
struct dirent **result)
{ {
int err; int err;
V9fsState *s = pdu->s; V9fsState *s = pdu->s;
@ -28,11 +27,14 @@ int v9fs_co_readdir_r(V9fsPDU *pdu, V9fsFidState *fidp, struct dirent *dent,
} }
v9fs_co_run_in_worker( v9fs_co_run_in_worker(
{ {
struct dirent *entry;
errno = 0; errno = 0;
err = s->ops->readdir_r(&s->ctx, &fidp->fs, dent, result); entry = s->ops->readdir(&s->ctx, &fidp->fs);
if (!*result && errno) { if (!entry && errno) {
err = -errno; err = -errno;
} else { } else {
*dent = entry;
err = 0; err = 0;
} }
}); });

3
hw/9pfs/coth.h
View File

@ -49,8 +49,7 @@
extern void co_run_in_worker_bh(void *); extern void co_run_in_worker_bh(void *);
extern int v9fs_co_readlink(V9fsPDU *, V9fsPath *, V9fsString *); extern int v9fs_co_readlink(V9fsPDU *, V9fsPath *, V9fsString *);
extern int v9fs_co_readdir_r(V9fsPDU *, V9fsFidState *, extern int v9fs_co_readdir(V9fsPDU *, V9fsFidState *, struct dirent **);
struct dirent *, struct dirent **result);
extern off_t v9fs_co_telldir(V9fsPDU *, V9fsFidState *); extern off_t v9fs_co_telldir(V9fsPDU *, V9fsFidState *);
extern void v9fs_co_seekdir(V9fsPDU *, V9fsFidState *, off_t); extern void v9fs_co_seekdir(V9fsPDU *, V9fsFidState *, off_t);
extern void v9fs_co_rewinddir(V9fsPDU *, V9fsFidState *); extern void v9fs_co_rewinddir(V9fsPDU *, V9fsFidState *);