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
diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
index 4897dac..6aeb8d4 100644
--- a/fs/cifs/cifsencrypt.c
+++ b/fs/cifs/cifsencrypt.c
@@ -66,6 +66,60 @@
return 0;
}
+int __cifs_calc_signature(struct smb_rqst *rqst,
+ struct TCP_Server_Info *server, char *signature,
+ struct shash_desc *shash)
+{
+ int i;
+ int rc;
+ struct kvec *iov = rqst->rq_iov;
+ int n_vec = rqst->rq_nvec;
+
+ for (i = 0; i < n_vec; i++) {
+ if (iov[i].iov_len == 0)
+ continue;
+ if (iov[i].iov_base == NULL) {
+ cifs_dbg(VFS, "null iovec entry\n");
+ return -EIO;
+ }
+ /* The first entry includes a length field (which does not get
+ signed that occupies the first 4 bytes before the header */
+ if (i == 0) {
+ if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
+ break; /* nothing to sign or corrupt header */
+ rc = crypto_shash_update(shash,
+ iov[i].iov_base + 4, iov[i].iov_len - 4);
+ } else {
+ rc = crypto_shash_update(shash,
+ iov[i].iov_base, iov[i].iov_len);
+ }
+ if (rc) {
+ cifs_dbg(VFS, "%s: Could not update with payload\n",
+ __func__);
+ return rc;
+ }
+ }
+
+ /* now hash over the rq_pages array */
+ for (i = 0; i < rqst->rq_npages; i++) {
+ void *kaddr = kmap(rqst->rq_pages[i]);
+ size_t len = rqst->rq_pagesz;
+
+ if (i == rqst->rq_npages - 1)
+ len = rqst->rq_tailsz;
+
+ crypto_shash_update(shash, kaddr, len);
+
+ kunmap(rqst->rq_pages[i]);
+ }
+
+ rc = crypto_shash_final(shash, signature);
+ if (rc)
+ cifs_dbg(VFS, "%s: Could not generate hash\n", __func__);
+
+ return rc;
+}
+
/*
* Calculate and return the CIFS signature based on the mac key and SMB PDU.
* The 16 byte signature must be allocated by the caller. Note we only use the
@@ -76,12 +130,9 @@
static int cifs_calc_signature(struct smb_rqst *rqst,
struct TCP_Server_Info *server, char *signature)
{
- int i;
int rc;
- struct kvec *iov = rqst->rq_iov;
- int n_vec = rqst->rq_nvec;
- if (iov == NULL || signature == NULL || server == NULL)
+ if (!rqst->rq_iov || !signature || !server)
return -EINVAL;
if (!server->secmech.sdescmd5) {
@@ -105,48 +156,8 @@
return rc;
}
- for (i = 0; i < n_vec; i++) {
- if (iov[i].iov_len == 0)
- continue;
- if (iov[i].iov_base == NULL) {
- cifs_dbg(VFS, "null iovec entry\n");
- return -EIO;
- }
- /* The first entry includes a length field (which does not get
- signed that occupies the first 4 bytes before the header */
- if (i == 0) {
- if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
- break; /* nothing to sign or corrupt header */
- rc =
- crypto_shash_update(&server->secmech.sdescmd5->shash,
- iov[i].iov_base + 4, iov[i].iov_len - 4);
- } else {
- rc =
- crypto_shash_update(&server->secmech.sdescmd5->shash,
- iov[i].iov_base, iov[i].iov_len);
- }
- if (rc) {
- cifs_dbg(VFS, "%s: Could not update with payload\n",
- __func__);
- return rc;
- }
- }
-
- /* now hash over the rq_pages array */
- for (i = 0; i < rqst->rq_npages; i++) {
- struct kvec p_iov;
-
- cifs_rqst_page_to_kvec(rqst, i, &p_iov);
- crypto_shash_update(&server->secmech.sdescmd5->shash,
- p_iov.iov_base, p_iov.iov_len);
- kunmap(rqst->rq_pages[i]);
- }
-
- rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
- if (rc)
- cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
-
- return rc;
+ return __cifs_calc_signature(rqst, server, signature,
+ &server->secmech.sdescmd5->shash);
}
/* must be called with server->srv_mutex held */
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index f2cc0b3..bba106c 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -615,8 +615,6 @@
bool sec_mskerberos; /* supports legacy MS Kerberos */
bool large_buf; /* is current buffer large? */
struct delayed_work echo; /* echo ping workqueue job */
- struct kvec *iov; /* reusable kvec array for receives */
- unsigned int nr_iov; /* number of kvecs in array */
char *smallbuf; /* pointer to current "small" buffer */
char *bigbuf; /* pointer to current "big" buffer */
unsigned int total_read; /* total amount of data read in this pass */
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index eed7ff5..0f9a6bc 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -37,8 +37,6 @@
extern struct smb_hdr *cifs_small_buf_get(void);
extern void cifs_small_buf_release(void *);
extern void free_rsp_buf(int, void *);
-extern void cifs_rqst_page_to_kvec(struct smb_rqst *rqst, unsigned int idx,
- struct kvec *iov);
extern int smb_send(struct TCP_Server_Info *, struct smb_hdr *,
unsigned int /* length */);
extern unsigned int _get_xid(void);
@@ -181,10 +179,9 @@
extern void dequeue_mid(struct mid_q_entry *mid, bool malformed);
extern int cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
- unsigned int to_read);
-extern int cifs_readv_from_socket(struct TCP_Server_Info *server,
- struct kvec *iov_orig, unsigned int nr_segs,
- unsigned int to_read);
+ unsigned int to_read);
+extern int cifs_read_page_from_socket(struct TCP_Server_Info *server,
+ struct page *page, unsigned int to_read);
extern void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
struct cifs_sb_info *cifs_sb);
extern int cifs_match_super(struct super_block *, void *);
@@ -512,4 +509,7 @@
struct cifs_sb_info *cifs_sb,
const unsigned char *path, char *pbuf,
unsigned int *pbytes_written);
+int __cifs_calc_signature(struct smb_rqst *rqst,
+ struct TCP_Server_Info *server, char *signature,
+ struct shash_desc *shash);
#endif /* _CIFSPROTO_H */
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 145c03e..d47197e 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -1447,10 +1447,8 @@
len = min_t(unsigned int, buflen, server->vals->read_rsp_size) -
HEADER_SIZE(server) + 1;
- rdata->iov.iov_base = buf + HEADER_SIZE(server) - 1;
- rdata->iov.iov_len = len;
-
- length = cifs_readv_from_socket(server, &rdata->iov, 1, len);
+ length = cifs_read_from_socket(server,
+ buf + HEADER_SIZE(server) - 1, len);
if (length < 0)
return length;
server->total_read += length;
@@ -1502,9 +1500,8 @@
len = data_offset - server->total_read;
if (len > 0) {
/* read any junk before data into the rest of smallbuf */
- rdata->iov.iov_base = buf + server->total_read;
- rdata->iov.iov_len = len;
- length = cifs_readv_from_socket(server, &rdata->iov, 1, len);
+ length = cifs_read_from_socket(server,
+ buf + server->total_read, len);
if (length < 0)
return length;
server->total_read += length;
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 1bb258a..66736f5 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -501,99 +501,34 @@
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;
+
+ length = sock_recvmsg(server->ssocket, smb_msg, 0);
+
+ if (server->tcpStatus == CifsExiting)
+ return -ESHUTDOWN;
+
+ if (server->tcpStatus == CifsNeedReconnect) {
+ cifs_reconnect(server);
+ return -ECONNABORTED;
}
- segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
-
- length = kernel_recvmsg(server->ssocket, &smb_msg,
- iov, segs, to_read, 0);
-
- if (server->tcpStatus == CifsExiting) {
- total_read = -ESHUTDOWN;
- break;
- } else if (server->tcpStatus == CifsNeedReconnect) {
- cifs_reconnect(server);
- total_read = -ECONNABORTED;
- break;
- } else if (length == -ERESTARTSYS ||
- length == -EAGAIN ||
- length == -EINTR) {
+ 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 @@
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 @@
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 @@
}
kfree(server->hostname);
- kfree(server->iov);
kfree(server);
length = atomic_dec_return(&tcpSesAllocCount);
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index f3a9029..9793ae0 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -2852,39 +2852,31 @@
int result = 0;
unsigned int i;
unsigned int nr_pages = rdata->nr_pages;
- struct kvec iov;
rdata->got_bytes = 0;
rdata->tailsz = PAGE_SIZE;
for (i = 0; i < nr_pages; i++) {
struct page *page = rdata->pages[i];
+ size_t n;
- if (len >= PAGE_SIZE) {
- /* enough data to fill the page */
- iov.iov_base = kmap(page);
- iov.iov_len = PAGE_SIZE;
- cifs_dbg(FYI, "%u: iov_base=%p iov_len=%zu\n",
- i, iov.iov_base, iov.iov_len);
- len -= PAGE_SIZE;
- } else if (len > 0) {
- /* enough for partial page, fill and zero the rest */
- iov.iov_base = kmap(page);
- iov.iov_len = len;
- cifs_dbg(FYI, "%u: iov_base=%p iov_len=%zu\n",
- i, iov.iov_base, iov.iov_len);
- memset(iov.iov_base + len, '\0', PAGE_SIZE - len);
- rdata->tailsz = len;
- len = 0;
- } else {
+ if (len <= 0) {
/* no need to hold page hostage */
rdata->pages[i] = NULL;
rdata->nr_pages--;
put_page(page);
continue;
}
-
- result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len);
- kunmap(page);
+ n = len;
+ if (len >= PAGE_SIZE) {
+ /* enough data to fill the page */
+ n = PAGE_SIZE;
+ len -= n;
+ } else {
+ zero_user(page, len, PAGE_SIZE - len);
+ rdata->tailsz = len;
+ len = 0;
+ }
+ result = cifs_read_page_from_socket(server, page, n);
if (result < 0)
break;
@@ -3300,7 +3292,6 @@
u64 eof;
pgoff_t eof_index;
unsigned int nr_pages = rdata->nr_pages;
- struct kvec iov;
/* determine the eof that the server (probably) has */
eof = CIFS_I(rdata->mapping->host)->server_eof;
@@ -3311,23 +3302,14 @@
rdata->tailsz = PAGE_SIZE;
for (i = 0; i < nr_pages; i++) {
struct page *page = rdata->pages[i];
+ size_t n = PAGE_SIZE;
if (len >= PAGE_SIZE) {
- /* enough data to fill the page */
- iov.iov_base = kmap(page);
- iov.iov_len = PAGE_SIZE;
- cifs_dbg(FYI, "%u: idx=%lu iov_base=%p iov_len=%zu\n",
- i, page->index, iov.iov_base, iov.iov_len);
len -= PAGE_SIZE;
} else if (len > 0) {
/* enough for partial page, fill and zero the rest */
- iov.iov_base = kmap(page);
- iov.iov_len = len;
- cifs_dbg(FYI, "%u: idx=%lu iov_base=%p iov_len=%zu\n",
- i, page->index, iov.iov_base, iov.iov_len);
- memset(iov.iov_base + len,
- '\0', PAGE_SIZE - len);
- rdata->tailsz = len;
+ zero_user(page, len, PAGE_SIZE - len);
+ n = rdata->tailsz = len;
len = 0;
} else if (page->index > eof_index) {
/*
@@ -3357,8 +3339,7 @@
continue;
}
- result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len);
- kunmap(page);
+ result = cifs_read_page_from_socket(server, page, n);
if (result < 0)
break;
diff --git a/fs/cifs/smb2transport.c b/fs/cifs/smb2transport.c
index 8732a43..bc9a7b6 100644
--- a/fs/cifs/smb2transport.c
+++ b/fs/cifs/smb2transport.c
@@ -135,11 +135,10 @@
int
smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
{
- int i, rc;
+ int rc;
unsigned char smb2_signature[SMB2_HMACSHA256_SIZE];
unsigned char *sigptr = smb2_signature;
struct kvec *iov = rqst->rq_iov;
- int n_vec = rqst->rq_nvec;
struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)iov[0].iov_base;
struct cifs_ses *ses;
@@ -171,53 +170,11 @@
return rc;
}
- for (i = 0; i < n_vec; i++) {
- if (iov[i].iov_len == 0)
- continue;
- if (iov[i].iov_base == NULL) {
- cifs_dbg(VFS, "null iovec entry\n");
- return -EIO;
- }
- /*
- * The first entry includes a length field (which does not get
- * signed that occupies the first 4 bytes before the header).
- */
- if (i == 0) {
- if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
- break; /* nothing to sign or corrupt header */
- rc =
- crypto_shash_update(
- &server->secmech.sdeschmacsha256->shash,
- iov[i].iov_base + 4, iov[i].iov_len - 4);
- } else {
- rc =
- crypto_shash_update(
- &server->secmech.sdeschmacsha256->shash,
- iov[i].iov_base, iov[i].iov_len);
- }
- if (rc) {
- cifs_dbg(VFS, "%s: Could not update with payload\n",
- __func__);
- return rc;
- }
- }
+ rc = __cifs_calc_signature(rqst, server, sigptr,
+ &server->secmech.sdeschmacsha256->shash);
- /* now hash over the rq_pages array */
- for (i = 0; i < rqst->rq_npages; i++) {
- struct kvec p_iov;
-
- cifs_rqst_page_to_kvec(rqst, i, &p_iov);
- crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
- p_iov.iov_base, p_iov.iov_len);
- kunmap(rqst->rq_pages[i]);
- }
-
- rc = crypto_shash_final(&server->secmech.sdeschmacsha256->shash,
- sigptr);
- if (rc)
- cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__);
-
- memcpy(smb2_pdu->Signature, sigptr, SMB2_SIGNATURE_SIZE);
+ if (!rc)
+ memcpy(smb2_pdu->Signature, sigptr, SMB2_SIGNATURE_SIZE);
return rc;
}
@@ -395,12 +352,10 @@
int
smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
{
- int i;
int rc = 0;
unsigned char smb3_signature[SMB2_CMACAES_SIZE];
unsigned char *sigptr = smb3_signature;
struct kvec *iov = rqst->rq_iov;
- int n_vec = rqst->rq_nvec;
struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)iov[0].iov_base;
struct cifs_ses *ses;
@@ -431,54 +386,12 @@
cifs_dbg(VFS, "%s: Could not init cmac aes\n", __func__);
return rc;
}
+
+ rc = __cifs_calc_signature(rqst, server, sigptr,
+ &server->secmech.sdesccmacaes->shash);
- for (i = 0; i < n_vec; i++) {
- if (iov[i].iov_len == 0)
- continue;
- if (iov[i].iov_base == NULL) {
- cifs_dbg(VFS, "null iovec entry");
- return -EIO;
- }
- /*
- * The first entry includes a length field (which does not get
- * signed that occupies the first 4 bytes before the header).
- */
- if (i == 0) {
- if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
- break; /* nothing to sign or corrupt header */
- rc =
- crypto_shash_update(
- &server->secmech.sdesccmacaes->shash,
- iov[i].iov_base + 4, iov[i].iov_len - 4);
- } else {
- rc =
- crypto_shash_update(
- &server->secmech.sdesccmacaes->shash,
- iov[i].iov_base, iov[i].iov_len);
- }
- if (rc) {
- cifs_dbg(VFS, "%s: Couldn't update cmac aes with payload\n",
- __func__);
- return rc;
- }
- }
-
- /* now hash over the rq_pages array */
- for (i = 0; i < rqst->rq_npages; i++) {
- struct kvec p_iov;
-
- cifs_rqst_page_to_kvec(rqst, i, &p_iov);
- crypto_shash_update(&server->secmech.sdesccmacaes->shash,
- p_iov.iov_base, p_iov.iov_len);
- kunmap(rqst->rq_pages[i]);
- }
-
- rc = crypto_shash_final(&server->secmech.sdesccmacaes->shash,
- sigptr);
- if (rc)
- cifs_dbg(VFS, "%s: Could not generate cmac aes\n", __func__);
-
- memcpy(smb2_pdu->Signature, sigptr, SMB2_SIGNATURE_SIZE);
+ if (!rc)
+ memcpy(smb2_pdu->Signature, sigptr, SMB2_SIGNATURE_SIZE);
return rc;
}
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 87abe8e..206a597 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -124,41 +124,32 @@
/*
* smb_send_kvec - send an array of kvecs to the server
* @server: Server to send the data to
- * @iov: Pointer to array of kvecs
- * @n_vec: length of kvec array
+ * @smb_msg: Message to send
* @sent: amount of data sent on socket is stored here
*
* Our basic "send data to server" function. Should be called with srv_mutex
* held. The caller is responsible for handling the results.
*/
static int
-smb_send_kvec(struct TCP_Server_Info *server, struct kvec *iov, size_t n_vec,
- size_t *sent)
+smb_send_kvec(struct TCP_Server_Info *server, struct msghdr *smb_msg,
+ size_t *sent)
{
int rc = 0;
- int i = 0;
- struct msghdr smb_msg;
- unsigned int remaining;
- size_t first_vec = 0;
+ int retries = 0;
struct socket *ssocket = server->ssocket;
*sent = 0;
- smb_msg.msg_name = (struct sockaddr *) &server->dstaddr;
- smb_msg.msg_namelen = sizeof(struct sockaddr);
- smb_msg.msg_control = NULL;
- smb_msg.msg_controllen = 0;
+ smb_msg->msg_name = (struct sockaddr *) &server->dstaddr;
+ smb_msg->msg_namelen = sizeof(struct sockaddr);
+ smb_msg->msg_control = NULL;
+ smb_msg->msg_controllen = 0;
if (server->noblocksnd)
- smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL;
+ smb_msg->msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL;
else
- smb_msg.msg_flags = MSG_NOSIGNAL;
+ smb_msg->msg_flags = MSG_NOSIGNAL;
- remaining = 0;
- for (i = 0; i < n_vec; i++)
- remaining += iov[i].iov_len;
-
- i = 0;
- while (remaining) {
+ while (msg_data_left(smb_msg)) {
/*
* If blocking send, we try 3 times, since each can block
* for 5 seconds. For nonblocking we have to try more
@@ -177,35 +168,21 @@
* after the retries we will kill the socket and
* reconnect which may clear the network problem.
*/
- rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec],
- n_vec - first_vec, remaining);
+ rc = sock_sendmsg(ssocket, smb_msg);
if (rc == -EAGAIN) {
- i++;
- if (i >= 14 || (!server->noblocksnd && (i > 2))) {
+ retries++;
+ if (retries >= 14 ||
+ (!server->noblocksnd && (retries > 2))) {
cifs_dbg(VFS, "sends on sock %p stuck for 15 seconds\n",
ssocket);
- rc = -EAGAIN;
- break;
+ return -EAGAIN;
}
- msleep(1 << i);
+ msleep(1 << retries);
continue;
}
if (rc < 0)
- break;
-
- /* send was at least partially successful */
- *sent += rc;
-
- if (rc == remaining) {
- remaining = 0;
- break;
- }
-
- if (rc > remaining) {
- cifs_dbg(VFS, "sent %d requested %d\n", rc, remaining);
- break;
- }
+ return rc;
if (rc == 0) {
/* should never happen, letting socket clear before
@@ -215,59 +192,11 @@
continue;
}
- remaining -= rc;
-
- /* the line below resets i */
- for (i = first_vec; i < n_vec; i++) {
- if (iov[i].iov_len) {
- if (rc > iov[i].iov_len) {
- rc -= iov[i].iov_len;
- iov[i].iov_len = 0;
- } else {
- iov[i].iov_base += rc;
- iov[i].iov_len -= rc;
- first_vec = i;
- break;
- }
- }
- }
-
- i = 0; /* in case we get ENOSPC on the next send */
- rc = 0;
+ /* send was at least partially successful */
+ *sent += rc;
+ retries = 0; /* in case we get ENOSPC on the next send */
}
- return rc;
-}
-
-/**
- * rqst_page_to_kvec - Turn a slot in the smb_rqst page array into a kvec
- * @rqst: pointer to smb_rqst
- * @idx: index into the array of the page
- * @iov: pointer to struct kvec that will hold the result
- *
- * Helper function to convert a slot in the rqst->rq_pages array into a kvec.
- * The page will be kmapped and the address placed into iov_base. The length
- * will then be adjusted according to the ptailoff.
- */
-void
-cifs_rqst_page_to_kvec(struct smb_rqst *rqst, unsigned int idx,
- struct kvec *iov)
-{
- /*
- * FIXME: We could avoid this kmap altogether if we used
- * kernel_sendpage instead of kernel_sendmsg. That will only
- * work if signing is disabled though as sendpage inlines the
- * page directly into the fraglist. If userspace modifies the
- * page after we calculate the signature, then the server will
- * reject it and may break the connection. kernel_sendmsg does
- * an extra copy of the data and avoids that issue.
- */
- iov->iov_base = kmap(rqst->rq_pages[idx]);
-
- /* if last page, don't send beyond this offset into page */
- if (idx == (rqst->rq_npages - 1))
- iov->iov_len = rqst->rq_tailsz;
- else
- iov->iov_len = rqst->rq_pagesz;
+ return 0;
}
static unsigned long
@@ -299,8 +228,9 @@
unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base);
unsigned long send_length;
unsigned int i;
- size_t total_len = 0, sent;
+ size_t total_len = 0, sent, size;
struct socket *ssocket = server->ssocket;
+ struct msghdr smb_msg;
int val = 1;
if (ssocket == NULL)
@@ -321,7 +251,13 @@
kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK,
(char *)&val, sizeof(val));
- rc = smb_send_kvec(server, iov, n_vec, &sent);
+ size = 0;
+ for (i = 0; i < n_vec; i++)
+ size += iov[i].iov_len;
+
+ iov_iter_kvec(&smb_msg.msg_iter, WRITE | ITER_KVEC, iov, n_vec, size);
+
+ rc = smb_send_kvec(server, &smb_msg, &sent);
if (rc < 0)
goto uncork;
@@ -329,11 +265,16 @@
/* now walk the page array and send each page in it */
for (i = 0; i < rqst->rq_npages; i++) {
- struct kvec p_iov;
-
- cifs_rqst_page_to_kvec(rqst, i, &p_iov);
- rc = smb_send_kvec(server, &p_iov, 1, &sent);
- kunmap(rqst->rq_pages[i]);
+ size_t len = i == rqst->rq_npages - 1
+ ? rqst->rq_tailsz
+ : rqst->rq_pagesz;
+ struct bio_vec bvec = {
+ .bv_page = rqst->rq_pages[i],
+ .bv_len = len
+ };
+ iov_iter_bvec(&smb_msg.msg_iter, WRITE | ITER_BVEC,
+ &bvec, 1, len);
+ rc = smb_send_kvec(server, &smb_msg, &sent);
if (rc < 0)
break;