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* nscd/connections.c (send_ro_fd): Also transfer file size.

Browse Source 
* nscd/nscd_helper.c (get_mapping): If nscd also transfers the
	file size don't call fstat.
This commit is contained in:
Ulrich Drepper 2007-08-29 06:10:07 +00:00
parent 0adfcc0526
commit f3c54060af
3 changed files with 35 additions and 15 deletions
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4
ChangeLog
View File

@ -1,5 +1,9 @@
2007-08-28 Ulrich Drepper <drepper@redhat.com>
* 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.
* nscd/nscd_helper.c (get_mapping): Avoid the pread call, just go
ahead and map the file. This should always be correct and we can
catch problems later.

9
nscd/connections.c
View File

@ -907,9 +907,14 @@ send_ro_fd (struct database_dyn *db, char *key, int fd)
return;
/* We need to send some data along with the descriptor. */
struct iovec iov[1];
uint64_t mapsize = (db->head->data_size
+ roundup (db->head->module * sizeof (ref_t), ALIGN)
+ sizeof (struct database_pers_head));
struct iovec iov[2];
iov[0].iov_base = key;
iov[0].iov_len = strlen (key) + 1;
iov[1].iov_base = &mapsize;
iov[1].iov_len = sizeof (mapsize);
/* Prepare the control message to transfer the descriptor. */
union
@ -917,7 +922,7 @@ send_ro_fd (struct database_dyn *db, char *key, int fd)
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);

37
nscd/nscd_helper.c
View File

@ -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. */