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authorLinus Torvalds <torvalds@linux-foundation.org>2016-05-18 20:17:56 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-18 20:17:56 +0300
commit442c9ac989d71599ebc39f4ea4d5b0e64996904b (patch)
tree0770f4746d0c041c1f8288561ce3236e49f0b80b /fs/cifs/connect.c
parentba5a2655c270f59dea2d9b4d764aec2f6e7f5f41 (diff)
parent71335664c38f03de10d7cf1d82705fe55a130b33 (diff)
downloadlinux-442c9ac989d71599ebc39f4ea4d5b0e64996904b.tar.xz
Merge branch 'sendmsg.cifs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull cifs iovec cleanups from Al Viro. * 'sendmsg.cifs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: cifs: don't bother with kmap on read_pages side cifs_readv_receive: use cifs_read_from_socket() cifs: no need to wank with copying and advancing iovec on recvmsg side either cifs: quit playing games with draining iovecs cifs: merge the hash calculation helpers
Diffstat (limited to 'fs/cifs/connect.c')
-rw-r--r--fs/cifs/connect.c127
1 files changed, 35 insertions, 92 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 1bb258af1648..66736f57b5ab 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -501,99 +501,34 @@ server_unresponsive(struct TCP_Server_Info *server)
return false;
}
-/*
- * kvec_array_init - clone a kvec array, and advance into it
- * @new: pointer to memory for cloned array
- * @iov: pointer to original array
- * @nr_segs: number of members in original array
- * @bytes: number of bytes to advance into the cloned array
- *
- * This function will copy the array provided in iov to a section of memory
- * and advance the specified number of bytes into the new array. It returns
- * the number of segments in the new array. "new" must be at least as big as
- * the original iov array.
- */
-static unsigned int
-kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs,
- size_t bytes)
-{
- size_t base = 0;
-
- while (bytes || !iov->iov_len) {
- int copy = min(bytes, iov->iov_len);
-
- bytes -= copy;
- base += copy;
- if (iov->iov_len == base) {
- iov++;
- nr_segs--;
- base = 0;
- }
- }
- memcpy(new, iov, sizeof(*iov) * nr_segs);
- new->iov_base += base;
- new->iov_len -= base;
- return nr_segs;
-}
-
-static struct kvec *
-get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs)
-{
- struct kvec *new_iov;
-
- if (server->iov && nr_segs <= server->nr_iov)
- return server->iov;
-
- /* not big enough -- allocate a new one and release the old */
- new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS);
- if (new_iov) {
- kfree(server->iov);
- server->iov = new_iov;
- server->nr_iov = nr_segs;
- }
- return new_iov;
-}
-
-int
-cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
- unsigned int nr_segs, unsigned int to_read)
+static int
+cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
{
int length = 0;
int total_read;
- unsigned int segs;
- struct msghdr smb_msg;
- struct kvec *iov;
-
- iov = get_server_iovec(server, nr_segs);
- if (!iov)
- return -ENOMEM;
- smb_msg.msg_control = NULL;
- smb_msg.msg_controllen = 0;
+ smb_msg->msg_control = NULL;
+ smb_msg->msg_controllen = 0;
- for (total_read = 0; to_read; total_read += length, to_read -= length) {
+ for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
try_to_freeze();
- if (server_unresponsive(server)) {
- total_read = -ECONNABORTED;
- break;
- }
+ if (server_unresponsive(server))
+ return -ECONNABORTED;
- segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
+ length = sock_recvmsg(server->ssocket, smb_msg, 0);
- length = kernel_recvmsg(server->ssocket, &smb_msg,
- iov, segs, to_read, 0);
+ if (server->tcpStatus == CifsExiting)
+ return -ESHUTDOWN;
- if (server->tcpStatus == CifsExiting) {
- total_read = -ESHUTDOWN;
- break;
- } else if (server->tcpStatus == CifsNeedReconnect) {
+ if (server->tcpStatus == CifsNeedReconnect) {
cifs_reconnect(server);
- total_read = -ECONNABORTED;
- break;
- } else if (length == -ERESTARTSYS ||
- length == -EAGAIN ||
- length == -EINTR) {
+ return -ECONNABORTED;
+ }
+
+ if (length == -ERESTARTSYS ||
+ length == -EAGAIN ||
+ length == -EINTR) {
/*
* Minimum sleep to prevent looping, allowing socket
* to clear and app threads to set tcpStatus
@@ -602,12 +537,12 @@ cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
usleep_range(1000, 2000);
length = 0;
continue;
- } else if (length <= 0) {
- cifs_dbg(FYI, "Received no data or error: expecting %d\n"
- "got %d", to_read, length);
+ }
+
+ if (length <= 0) {
+ cifs_dbg(FYI, "Received no data or error: %d\n", length);
cifs_reconnect(server);
- total_read = -ECONNABORTED;
- break;
+ return -ECONNABORTED;
}
}
return total_read;
@@ -617,12 +552,21 @@ int
cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
unsigned int to_read)
{
- struct kvec iov;
+ struct msghdr smb_msg;
+ struct kvec iov = {.iov_base = buf, .iov_len = to_read};
+ iov_iter_kvec(&smb_msg.msg_iter, READ | ITER_KVEC, &iov, 1, to_read);
- iov.iov_base = buf;
- iov.iov_len = to_read;
+ return cifs_readv_from_socket(server, &smb_msg);
+}
- return cifs_readv_from_socket(server, &iov, 1, to_read);
+int
+cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
+ unsigned int to_read)
+{
+ struct msghdr smb_msg;
+ struct bio_vec bv = {.bv_page = page, .bv_len = to_read};
+ iov_iter_bvec(&smb_msg.msg_iter, READ | ITER_BVEC, &bv, 1, to_read);
+ return cifs_readv_from_socket(server, &smb_msg);
}
static bool
@@ -783,7 +727,6 @@ static void clean_demultiplex_info(struct TCP_Server_Info *server)
}
kfree(server->hostname);
- kfree(server->iov);
kfree(server);
length = atomic_dec_return(&tcpSesAllocCount);