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authorUlrich Drepper <drepper@redhat.com>2007-08-29 06:10:07 +0000
committerUlrich Drepper <drepper@redhat.com>2007-08-29 06:10:07 +0000
commitf3c54060af56e255844545fb566b83fcd6e9e9f5 (patch)
tree7b839d47f4d0b7e2c5552d88dcd4d8c537353621 /nscd/nscd_helper.c
parent0adfcc05265f4297adb89a040acb52689f3be87c (diff)
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* nscd/connections.c (send_ro_fd): Also transfer file size.
* nscd/nscd_helper.c (get_mapping): If nscd also transfers the file size don't call fstat.
Diffstat (limited to 'nscd/nscd_helper.c')
-rw-r--r--nscd/nscd_helper.c37
1 files changed, 24 insertions, 13 deletions
diff --git a/nscd/nscd_helper.c b/nscd/nscd_helper.c
index 780878d..5f3d54e 100644
--- a/nscd/nscd_helper.c
+++ b/nscd/nscd_helper.c
@@ -238,16 +238,19 @@ get_mapping (request_type type, const char *key,
/* Room for the data sent along with the file descriptor. We expect
the key name back. */
- struct iovec iov[1];
+ uint64_t mapsize;
+ struct iovec iov[2];
iov[0].iov_base = resdata;
iov[0].iov_len = keylen;
+ iov[1].iov_base = &mapsize;
+ iov[1].iov_len = sizeof (mapsize);
union
{
struct cmsghdr hdr;
char bytes[CMSG_SPACE (sizeof (int))];
} buf;
- struct msghdr msg = { .msg_iov = iov, .msg_iovlen = 1,
+ struct msghdr msg = { .msg_iov = iov, .msg_iovlen = 2,
.msg_control = buf.bytes,
.msg_controllen = sizeof (buf) };
struct cmsghdr *cmsg = CMSG_FIRSTHDR (&msg);
@@ -268,10 +271,7 @@ get_mapping (request_type type, const char *key,
# ifndef MSG_CMSG_CLOEXEC
# define MSG_CMSG_CLOEXEC 0
# endif
- if (__builtin_expect (TEMP_FAILURE_RETRY (__recvmsg (sock, &msg,
- MSG_CMSG_CLOEXEC))
- != keylen, 0))
- goto out_close2;
+ ssize_t n = TEMP_FAILURE_RETRY (__recvmsg (sock, &msg, MSG_CMSG_CLOEXEC));
if (__builtin_expect (CMSG_FIRSTHDR (&msg) == NULL
|| (CMSG_FIRSTHDR (&msg)->cmsg_len
@@ -280,14 +280,25 @@ get_mapping (request_type type, const char *key,
mapfd = *(int *) CMSG_DATA (cmsg);
- struct stat64 st;
- if (__builtin_expect (strcmp (resdata, key) != 0, 0)
- || __builtin_expect (fstat64 (mapfd, &st) != 0, 0)
- || __builtin_expect (st.st_size < sizeof (struct database_pers_head), 0))
+ if (__builtin_expect (n != keylen && n != keylen + sizeof (mapsize), 0))
+ goto out_close;
+
+ if (__builtin_expect (strcmp (resdata, key) != 0, 0))
goto out_close;
+ if (__builtin_expect (n == keylen, 0))
+ {
+ struct stat64 st;
+ if (__builtin_expect (fstat64 (mapfd, &st) != 0, 0)
+ || __builtin_expect (st.st_size < sizeof (struct database_pers_head),
+ 0))
+ goto out_close;
+
+ mapsize = st.st_size;
+ }
+
/* The file is large enough, map it now. */
- void *mapping = __mmap (NULL, st.st_size, PROT_READ, MAP_SHARED, mapfd, 0);
+ void *mapping = __mmap (NULL, mapsize, PROT_READ, MAP_SHARED, mapfd, 0);
if (__builtin_expect (mapping != MAP_FAILED, 1))
{
/* Check whether the database is correct and up-to-date. */
@@ -302,7 +313,7 @@ get_mapping (request_type type, const char *key,
< time (NULL)), 0))
{
out_unmap:
- __munmap (mapping, st.st_size);
+ __munmap (mapping, mapsize);
goto out_close;
}
@@ -310,7 +321,7 @@ get_mapping (request_type type, const char *key,
ALIGN)
+ head->data_size);
- if (__builtin_expect (st.st_size < size, 0))
+ if (__builtin_expect (mapsize < size, 0))
goto out_unmap;
/* Allocate a record for the mapping. */