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authorHarsh Prateek Bora <harsh@linux.vnet.ibm.com>2011-05-18 17:23:00 +0530
committerAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2011-08-22 09:44:52 +0530
commit5f524c1ebcc5e0dec0de8940d34f9adb3c7887a1 (patch)
tree05be96a33cb9e8cde3b4c39ab69217adfa627ba2
parentd208a0e00598d19abab7cb6dc97cf21d7bf0eede (diff)
use readdir_r instead of readdir for reentrancy
Signed-off-by: Harsh Prateek Bora <harsh@linux.vnet.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
-rw-r--r--fsdev/file-op-9p.h2
-rw-r--r--hw/9pfs/codir.c8
-rw-r--r--hw/9pfs/virtio-9p-coth.h4
-rw-r--r--hw/9pfs/virtio-9p-local.c7
-rw-r--r--hw/9pfs/virtio-9p.c22
5 files changed, 27 insertions, 16 deletions
diff --git a/fsdev/file-op-9p.h b/fsdev/file-op-9p.h
index af9daf797f..1eda342f69 100644
--- a/fsdev/file-op-9p.h
+++ b/fsdev/file-op-9p.h
@@ -78,7 +78,7 @@ typedef struct FileOperations
int (*open2)(FsContext *, const char *, int, FsCred *);
void (*rewinddir)(FsContext *, DIR *);
off_t (*telldir)(FsContext *, DIR *);
- struct dirent *(*readdir)(FsContext *, DIR *);
+ int (*readdir_r)(FsContext *, DIR *, struct dirent *, struct dirent **);
void (*seekdir)(FsContext *, DIR *, off_t);
ssize_t (*preadv)(FsContext *, int, const struct iovec *, int, off_t);
ssize_t (*pwritev)(FsContext *, int, const struct iovec *, int, off_t);
diff --git a/hw/9pfs/codir.c b/hw/9pfs/codir.c
index 0c31db3cbc..3a257b9027 100644
--- a/hw/9pfs/codir.c
+++ b/hw/9pfs/codir.c
@@ -17,16 +17,16 @@
#include "qemu-coroutine.h"
#include "virtio-9p-coth.h"
-int v9fs_co_readdir(V9fsState *s, V9fsFidState *fidp, struct dirent **dent)
+int v9fs_co_readdir_r(V9fsState *s, V9fsFidState *fidp, struct dirent *dent,
+ struct dirent **result)
{
int err;
v9fs_co_run_in_worker(
{
errno = 0;
- /*FIXME!! need to switch to readdir_r */
- *dent = s->ops->readdir(&s->ctx, fidp->fs.dir);
- if (!*dent && errno) {
+ err = s->ops->readdir_r(&s->ctx, fidp->fs.dir, dent, result);
+ if (!*result && errno) {
err = -errno;
} else {
err = 0;
diff --git a/hw/9pfs/virtio-9p-coth.h b/hw/9pfs/virtio-9p-coth.h
index 5fa2972683..48defb72ff 100644
--- a/hw/9pfs/virtio-9p-coth.h
+++ b/hw/9pfs/virtio-9p-coth.h
@@ -57,8 +57,8 @@ typedef struct V9fsThPool {
extern void co_run_in_worker_bh(void *);
extern int v9fs_init_worker_threads(void);
extern int v9fs_co_readlink(V9fsState *, V9fsString *, V9fsString *);
-extern int v9fs_co_readdir(V9fsState *, V9fsFidState *,
- struct dirent **);
+extern int v9fs_co_readdir_r(V9fsState *, V9fsFidState *,
+ struct dirent *, struct dirent **result);
extern off_t v9fs_co_telldir(V9fsState *, V9fsFidState *);
extern void v9fs_co_seekdir(V9fsState *, V9fsFidState *, off_t);
extern void v9fs_co_rewinddir(V9fsState *, V9fsFidState *);
diff --git a/hw/9pfs/virtio-9p-local.c b/hw/9pfs/virtio-9p-local.c
index 77904c37bd..61cbf8db14 100644
--- a/hw/9pfs/virtio-9p-local.c
+++ b/hw/9pfs/virtio-9p-local.c
@@ -165,9 +165,10 @@ static off_t local_telldir(FsContext *ctx, DIR *dir)
return telldir(dir);
}
-static struct dirent *local_readdir(FsContext *ctx, DIR *dir)
+static int local_readdir_r(FsContext *ctx, DIR *dir, struct dirent *entry,
+ struct dirent **result)
{
- return readdir(dir);
+ return readdir_r(dir, entry, result);
}
static void local_seekdir(FsContext *ctx, DIR *dir, off_t off)
@@ -532,7 +533,7 @@ FileOperations local_ops = {
.opendir = local_opendir,
.rewinddir = local_rewinddir,
.telldir = local_telldir,
- .readdir = local_readdir,
+ .readdir_r = local_readdir_r,
.seekdir = local_seekdir,
.preadv = local_preadv,
.pwritev = local_pwritev,
diff --git a/hw/9pfs/virtio-9p.c b/hw/9pfs/virtio-9p.c
index 4abf2f9ef8..ad70768dce 100644
--- a/hw/9pfs/virtio-9p.c
+++ b/hw/9pfs/virtio-9p.c
@@ -1495,17 +1495,20 @@ static int v9fs_do_readdir_with_stat(V9fsState *s, V9fsPDU *pdu,
int32_t count = 0;
struct stat stbuf;
off_t saved_dir_pos;
- struct dirent *dent;
+ struct dirent *dent, *result;
/* save the directory position */
saved_dir_pos = v9fs_co_telldir(s, fidp);
if (saved_dir_pos < 0) {
return saved_dir_pos;
}
+
+ dent = g_malloc(sizeof(struct dirent));
+
while (1) {
v9fs_string_init(&name);
- err = v9fs_co_readdir(s, fidp, &dent);
- if (err || !dent) {
+ err = v9fs_co_readdir_r(s, fidp, dent, &result);
+ if (err || !result) {
break;
}
v9fs_string_sprintf(&name, "%s/%s", fidp->path.data, dent->d_name);
@@ -1524,6 +1527,7 @@ static int v9fs_do_readdir_with_stat(V9fsState *s, V9fsPDU *pdu,
v9fs_co_seekdir(s, fidp, saved_dir_pos);
v9fs_stat_free(&v9stat);
v9fs_string_free(&name);
+ g_free(dent);
return count;
}
count += len;
@@ -1532,6 +1536,7 @@ static int v9fs_do_readdir_with_stat(V9fsState *s, V9fsPDU *pdu,
saved_dir_pos = dent->d_off;
}
out:
+ g_free(dent);
v9fs_string_free(&name);
if (err < 0) {
return err;
@@ -1628,16 +1633,19 @@ static int v9fs_do_readdir(V9fsState *s, V9fsPDU *pdu,
int len, err = 0;
int32_t count = 0;
off_t saved_dir_pos;
- struct dirent *dent;
+ struct dirent *dent, *result;
/* save the directory position */
saved_dir_pos = v9fs_co_telldir(s, fidp);
if (saved_dir_pos < 0) {
return saved_dir_pos;
}
+
+ dent = g_malloc(sizeof(struct dirent));
+
while (1) {
- err = v9fs_co_readdir(s, fidp, &dent);
- if (err || !dent) {
+ err = v9fs_co_readdir_r(s, fidp, dent, &result);
+ if (err || !result) {
break;
}
v9fs_string_init(&name);
@@ -1646,6 +1654,7 @@ static int v9fs_do_readdir(V9fsState *s, V9fsPDU *pdu,
/* Ran out of buffer. Set dir back to old position and return */
v9fs_co_seekdir(s, fidp, saved_dir_pos);
v9fs_string_free(&name);
+ g_free(dent);
return count;
}
/*
@@ -1667,6 +1676,7 @@ static int v9fs_do_readdir(V9fsState *s, V9fsPDU *pdu,
v9fs_string_free(&name);
saved_dir_pos = dent->d_off;
}
+ g_free(dent);
if (err < 0) {
return err;
}