}
static bool
-allocate_buffers(char **bigbuf, char **smallbuf, unsigned int size,
- bool is_large_buf)
+allocate_buffers(struct TCP_Server_Info *server)
{
- char *bbuf = *bigbuf, *sbuf = *smallbuf;
-
- if (bbuf == NULL) {
- bbuf = (char *)cifs_buf_get();
- if (!bbuf) {
+ if (!server->bigbuf) {
+ server->bigbuf = (char *)cifs_buf_get();
+ if (!server->bigbuf) {
cERROR(1, "No memory for large SMB response");
msleep(3000);
/* retry will check if exiting */
return false;
}
- } else if (is_large_buf) {
+ } else if (server->large_buf) {
/* we are reusing a dirty large buf, clear its start */
- memset(bbuf, 0, size);
+ memset(server->bigbuf, 0, sizeof(struct smb_hdr));
}
- if (sbuf == NULL) {
- sbuf = (char *)cifs_small_buf_get();
- if (!sbuf) {
+ if (!server->smallbuf) {
+ server->smallbuf = (char *)cifs_small_buf_get();
+ if (!server->smallbuf) {
cERROR(1, "No memory for SMB response");
msleep(1000);
/* retry will check if exiting */
/* beginning of smb buffer is cleared in our buf_get */
} else {
/* if existing small buf clear beginning */
- memset(sbuf, 0, size);
+ memset(server->smallbuf, 0, sizeof(struct smb_hdr));
}
- *bigbuf = bbuf;
- *smallbuf = sbuf;
-
return true;
}
return new_iov;
}
-static int
-readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
- unsigned int nr_segs, unsigned int to_read)
+int
+cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
+ unsigned int nr_segs, unsigned int to_read)
{
int length = 0;
int total_read;
return total_read;
}
-static int
-read_from_socket(struct TCP_Server_Info *server, char *buf,
- unsigned int to_read)
+int
+cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
+ unsigned int to_read)
{
struct kvec iov;
iov.iov_base = buf;
iov.iov_len = to_read;
- return readv_from_socket(server, &iov, 1, to_read);
+ return cifs_readv_from_socket(server, &iov, 1, to_read);
}
static bool
return NULL;
}
-static void
-dequeue_mid(struct mid_q_entry *mid, int malformed)
+void
+dequeue_mid(struct mid_q_entry *mid, bool malformed)
{
#ifdef CONFIG_CIFS_STATS2
mid->when_received = jiffies;
spin_unlock(&GlobalMid_Lock);
}
-static struct mid_q_entry *
-find_cifs_mid(struct TCP_Server_Info *server, struct smb_hdr *buf,
- int *malformed, bool is_large_buf, bool *is_multi_rsp,
- char **bigbuf)
+static void
+handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
+ struct smb_hdr *buf, int malformed)
{
- struct mid_q_entry *mid = NULL;
-
- mid = find_mid(server, buf);
- if (!mid)
- return mid;
-
- if (*malformed == 0 && check2ndT2(buf) > 0) {
- /* We have a multipart transact2 resp */
- *is_multi_rsp = true;
+ if (malformed == 0 && check2ndT2(buf) > 0) {
+ mid->multiRsp = true;
if (mid->resp_buf) {
/* merge response - fix up 1st*/
- *malformed = coalesce_t2(buf, mid->resp_buf);
- if (*malformed > 0) {
- *malformed = 0;
- mid->multiRsp = true;
- return NULL;
- }
+ malformed = coalesce_t2(buf, mid->resp_buf);
+ if (malformed > 0)
+ return;
+
/* All parts received or packet is malformed. */
mid->multiEnd = true;
- goto multi_t2_fnd;
+ return dequeue_mid(mid, malformed);
}
- if (!is_large_buf) {
+ if (!server->large_buf) {
/*FIXME: switch to already allocated largebuf?*/
cERROR(1, "1st trans2 resp needs bigbuf");
} else {
/* Have first buffer */
mid->resp_buf = buf;
mid->largeBuf = true;
- *bigbuf = NULL;
+ server->bigbuf = NULL;
}
- return mid;
+ return;
}
mid->resp_buf = buf;
- mid->largeBuf = is_large_buf;
-multi_t2_fnd:
- dequeue_mid(mid, *malformed);
- return mid;
+ mid->largeBuf = server->large_buf;
+ /* Was previous buf put in mpx struct for multi-rsp? */
+ if (!mid->multiRsp) {
+ /* smb buffer will be freed by user thread */
+ if (server->large_buf)
+ server->bigbuf = NULL;
+ else
+ server->smallbuf = NULL;
+ }
+ dequeue_mid(mid, malformed);
}
static void clean_demultiplex_info(struct TCP_Server_Info *server)
GFP_KERNEL);
}
+static int
+standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
+{
+ int length;
+ char *buf = server->smallbuf;
+ struct smb_hdr *smb_buffer = (struct smb_hdr *)buf;
+ unsigned int pdu_length = be32_to_cpu(smb_buffer->smb_buf_length);
+
+ /* make sure this will fit in a large buffer */
+ if (pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
+ cERROR(1, "SMB response too long (%u bytes)",
+ pdu_length);
+ cifs_reconnect(server);
+ wake_up(&server->response_q);
+ return -EAGAIN;
+ }
+
+ /* switch to large buffer if too big for a small one */
+ if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
+ server->large_buf = true;
+ memcpy(server->bigbuf, server->smallbuf, server->total_read);
+ buf = server->bigbuf;
+ smb_buffer = (struct smb_hdr *)buf;
+ }
+
+ /* now read the rest */
+ length = cifs_read_from_socket(server,
+ buf + sizeof(struct smb_hdr) - 1,
+ pdu_length - sizeof(struct smb_hdr) + 1 + 4);
+ if (length < 0)
+ return length;
+ server->total_read += length;
+
+ dump_smb(smb_buffer, server->total_read);
+
+ /*
+ * We know that we received enough to get to the MID as we
+ * checked the pdu_length earlier. Now check to see
+ * if the rest of the header is OK. We borrow the length
+ * var for the rest of the loop to avoid a new stack var.
+ *
+ * 48 bytes is enough to display the header and a little bit
+ * into the payload for debugging purposes.
+ */
+ length = checkSMB(smb_buffer, smb_buffer->Mid, server->total_read);
+ if (length != 0)
+ cifs_dump_mem("Bad SMB: ", buf,
+ min_t(unsigned int, server->total_read, 48));
+
+ if (mid)
+ handle_mid(mid, server, smb_buffer, length);
+
+ return length;
+}
+
static int
cifs_demultiplex_thread(void *p)
{
int length;
struct TCP_Server_Info *server = p;
- unsigned int pdu_length, total_read;
- char *buf = NULL, *bigbuf = NULL, *smallbuf = NULL;
+ unsigned int pdu_length;
+ char *buf = NULL;
struct smb_hdr *smb_buffer = NULL;
struct task_struct *task_to_wake = NULL;
struct mid_q_entry *mid_entry;
- bool isLargeBuf = false;
- bool isMultiRsp = false;
current->flags |= PF_MEMALLOC;
cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
if (try_to_freeze())
continue;
- if (!allocate_buffers(&bigbuf, &smallbuf,
- sizeof(struct smb_hdr), isLargeBuf))
+ if (!allocate_buffers(server))
continue;
- isLargeBuf = false;
- isMultiRsp = false;
- smb_buffer = (struct smb_hdr *)smallbuf;
- buf = smallbuf;
+ server->large_buf = false;
+ smb_buffer = (struct smb_hdr *)server->smallbuf;
+ buf = server->smallbuf;
pdu_length = 4; /* enough to get RFC1001 header */
- length = read_from_socket(server, buf, pdu_length);
+ length = cifs_read_from_socket(server, buf, pdu_length);
if (length < 0)
continue;
- total_read = length;
+ server->total_read = length;
/*
* The right amount was read from socket - 4 bytes,
}
/* read down to the MID */
- length = read_from_socket(server, buf + 4,
- sizeof(struct smb_hdr) - 1 - 4);
+ length = cifs_read_from_socket(server, buf + 4,
+ sizeof(struct smb_hdr) - 1 - 4);
if (length < 0)
continue;
- total_read += length;
+ server->total_read += length;
- if (pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
- cERROR(1, "SMB response too long (%u bytes)",
- pdu_length);
- cifs_reconnect(server);
- wake_up(&server->response_q);
- continue;
- }
+ mid_entry = find_mid(server, smb_buffer);
- /* else length ok */
- if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
- isLargeBuf = true;
- memcpy(bigbuf, smallbuf, total_read);
- smb_buffer = (struct smb_hdr *)bigbuf;
- buf = bigbuf;
- }
+ if (!mid_entry || !mid_entry->receive)
+ length = standard_receive3(server, mid_entry);
+ else
+ length = mid_entry->receive(server, mid_entry);
- /* now read the rest */
- length = read_from_socket(server,
- buf + sizeof(struct smb_hdr) - 1,
- pdu_length - sizeof(struct smb_hdr) + 1 + 4);
if (length < 0)
continue;
- total_read += length;
- dump_smb(smb_buffer, total_read);
-
- /*
- * We know that we received enough to get to the MID as we
- * checked the pdu_length earlier. Now check to see
- * if the rest of the header is OK. We borrow the length
- * var for the rest of the loop to avoid a new stack var.
- *
- * 48 bytes is enough to display the header and a little bit
- * into the payload for debugging purposes.
- */
- length = checkSMB(smb_buffer, smb_buffer->Mid, total_read);
- if (length != 0)
- cifs_dump_mem("Bad SMB: ", buf,
- min_t(unsigned int, total_read, 48));
+ if (server->large_buf) {
+ buf = server->bigbuf;
+ smb_buffer = (struct smb_hdr *)buf;
+ }
server->lstrp = jiffies;
-
- mid_entry = find_cifs_mid(server, smb_buffer, &length,
- isLargeBuf, &isMultiRsp, &bigbuf);
if (mid_entry != NULL) {
- mid_entry->callback(mid_entry);
- /* Was previous buf put in mpx struct for multi-rsp? */
- if (!isMultiRsp) {
- /* smb buffer will be freed by user thread */
- if (isLargeBuf)
- bigbuf = NULL;
- else
- smallbuf = NULL;
- }
- } else if (length != 0) {
- /* response sanity checks failed */
- continue;
- } else if (!is_valid_oplock_break(smb_buffer, server) &&
- !isMultiRsp) {
+ if (!mid_entry->multiRsp || mid_entry->multiEnd)
+ mid_entry->callback(mid_entry);
+ } else if (!is_valid_oplock_break(smb_buffer, server)) {
cERROR(1, "No task to wake, unknown frame received! "
"NumMids %d", atomic_read(&midCount));
cifs_dump_mem("Received Data is: ", buf,
} /* end while !EXITING */
/* buffer usually freed in free_mid - need to free it here on exit */
- cifs_buf_release(bigbuf);
- if (smallbuf) /* no sense logging a debug message if NULL */
- cifs_small_buf_release(smallbuf);
+ cifs_buf_release(server->bigbuf);
+ if (server->smallbuf) /* no sense logging a debug message if NULL */
+ cifs_small_buf_release(server->smallbuf);
task_to_wake = xchg(&server->tsk, NULL);
clean_demultiplex_info(server);
(new->mnt_cifs_flags & CIFS_MOUNT_MASK))
return 0;
- if (old->rsize != new->rsize)
- return 0;
-
/*
- * We want to share sb only if we don't specify wsize or specified wsize
- * is greater or equal than existing one.
+ * We want to share sb only if we don't specify an r/wsize or
+ * specified r/wsize is greater than or equal to existing one.
*/
if (new->wsize && new->wsize < old->wsize)
return 0;
+ if (new->rsize && new->rsize < old->rsize)
+ return 0;
+
if (old->mnt_uid != new->mnt_uid || old->mnt_gid != new->mnt_gid)
return 0;
CIFS_MOUNT_POSIX_PATHS;
}
- if (cifs_sb && (cifs_sb->rsize > 127 * 1024)) {
- if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
- cifs_sb->rsize = 127 * 1024;
- cFYI(DBG2, "larger reads not supported by srv");
- }
- }
-
-
cFYI(1, "Negotiate caps 0x%x", (int)cap);
#ifdef CONFIG_CIFS_DEBUG2
if (cap & CIFS_UNIX_FCNTL_CAP)
spin_lock_init(&cifs_sb->tlink_tree_lock);
cifs_sb->tlink_tree = RB_ROOT;
- if (pvolume_info->rsize > CIFSMaxBufSize) {
- cERROR(1, "rsize %d too large, using MaxBufSize",
- pvolume_info->rsize);
- cifs_sb->rsize = CIFSMaxBufSize;
- } else if ((pvolume_info->rsize) &&
- (pvolume_info->rsize <= CIFSMaxBufSize))
- cifs_sb->rsize = pvolume_info->rsize;
- else /* default */
- cifs_sb->rsize = CIFSMaxBufSize;
-
- if (cifs_sb->rsize < 2048) {
- cifs_sb->rsize = 2048;
- /* Windows ME may prefer this */
- cFYI(1, "readsize set to minimum: 2048");
- }
-
/*
- * Temporarily set wsize for matching superblock. If we end up using
- * new sb then cifs_negotiate_wsize will later negotiate it downward
- * if needed.
+ * Temporarily set r/wsize for matching superblock. If we end up using
+ * new sb then client will later negotiate it downward if needed.
*/
+ cifs_sb->rsize = pvolume_info->rsize;
cifs_sb->wsize = pvolume_info->wsize;
cifs_sb->mnt_uid = pvolume_info->linux_uid;
}
/*
- * When the server supports very large writes via POSIX extensions, we can
- * allow up to 2^24-1, minus the size of a WRITE_AND_X header, not including
- * the RFC1001 length.
+ * When the server supports very large reads and writes via POSIX extensions,
+ * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
+ * including the RFC1001 length.
*
* Note that this might make for "interesting" allocation problems during
* writeback however as we have to allocate an array of pointers for the
* pages. A 16M write means ~32kb page array with PAGE_CACHE_SIZE == 4096.
+ *
+ * For reads, there is a similar problem as we need to allocate an array
+ * of kvecs to handle the receive, though that should only need to be done
+ * once.
*/
#define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
+#define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
/*
- * When the server doesn't allow large posix writes, only allow a wsize of
- * 2^17-1 minus the size of the WRITE_AND_X header. That allows for a write up
- * to the maximum size described by RFC1002.
+ * When the server doesn't allow large posix writes, only allow a rsize/wsize
+ * of 2^17-1 minus the size of the call header. That allows for a read or
+ * write up to the maximum size described by RFC1002.
*/
#define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
+#define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
/*
* The default wsize is 1M. find_get_pages seems to return a maximum of 256
* pages in a single call. With PAGE_CACHE_SIZE == 4k, this means we can fill
* a single wsize request with a single call.
*/
-#define CIFS_DEFAULT_WSIZE (1024 * 1024)
+#define CIFS_DEFAULT_IOSIZE (1024 * 1024)
+
+/*
+ * Windows only supports a max of 60k reads. Default to that when posix
+ * extensions aren't in force.
+ */
+#define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
static unsigned int
cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info)
__u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
struct TCP_Server_Info *server = tcon->ses->server;
unsigned int wsize = pvolume_info->wsize ? pvolume_info->wsize :
- CIFS_DEFAULT_WSIZE;
+ CIFS_DEFAULT_IOSIZE;
/* can server support 24-bit write sizes? (via UNIX extensions) */
if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
return wsize;
}
+static unsigned int
+cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info)
+{
+ __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
+ struct TCP_Server_Info *server = tcon->ses->server;
+ unsigned int rsize, defsize;
+
+ /*
+ * Set default value...
+ *
+ * HACK alert! Ancient servers have very small buffers. Even though
+ * MS-CIFS indicates that servers are only limited by the client's
+ * bufsize for reads, testing against win98se shows that it throws
+ * INVALID_PARAMETER errors if you try to request too large a read.
+ *
+ * If the server advertises a MaxBufferSize of less than one page,
+ * assume that it also can't satisfy reads larger than that either.
+ *
+ * FIXME: Is there a better heuristic for this?
+ */
+ if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP))
+ defsize = CIFS_DEFAULT_IOSIZE;
+ else if (server->capabilities & CAP_LARGE_READ_X)
+ defsize = CIFS_DEFAULT_NON_POSIX_RSIZE;
+ else if (server->maxBuf >= PAGE_CACHE_SIZE)
+ defsize = CIFSMaxBufSize;
+ else
+ defsize = server->maxBuf - sizeof(READ_RSP);
+
+ rsize = pvolume_info->rsize ? pvolume_info->rsize : defsize;
+
+ /*
+ * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to
+ * the client's MaxBufferSize.
+ */
+ if (!(server->capabilities & CAP_LARGE_READ_X))
+ rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);
+
+ /* hard limit of CIFS_MAX_RSIZE */
+ rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);
+
+ return rsize;
+}
+
static int
is_path_accessible(int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, const char *full_path)
{
kfree(volume_info->username);
kzfree(volume_info->password);
- kfree(volume_info->UNC);
if (volume_info->UNCip != volume_info->UNC + 2)
kfree(volume_info->UNCip);
+ kfree(volume_info->UNC);
kfree(volume_info->domainname);
kfree(volume_info->iocharset);
kfree(volume_info->prepath);
return volume_info;
}
+/* make sure ra_pages is a multiple of rsize */
+static inline unsigned int
+cifs_ra_pages(struct cifs_sb_info *cifs_sb)
+{
+ unsigned int reads;
+ unsigned int rsize_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
+
+ if (rsize_pages >= default_backing_dev_info.ra_pages)
+ return default_backing_dev_info.ra_pages;
+ else if (rsize_pages == 0)
+ return rsize_pages;
+
+ reads = default_backing_dev_info.ra_pages / rsize_pages;
+ return reads * rsize_pages;
+}
+
int
cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
{
if (rc)
return rc;
- cifs_sb->bdi.ra_pages = default_backing_dev_info.ra_pages;
-
#ifdef CONFIG_CIFS_DFS_UPCALL
try_mount_again:
/* cleanup activities if we're chasing a referral */
CIFSSMBQFSAttributeInfo(xid, tcon);
}
- if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
- cifs_sb->rsize = 1024 * 127;
- cFYI(DBG2, "no very large read support, rsize now 127K");
- }
- if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
- cifs_sb->rsize = min(cifs_sb->rsize, CIFSMaxBufSize);
-
cifs_sb->wsize = cifs_negotiate_wsize(tcon, volume_info);
+ cifs_sb->rsize = cifs_negotiate_rsize(tcon, volume_info);
+
+ /* tune readahead according to rsize */
+ cifs_sb->bdi.ra_pages = cifs_ra_pages(cifs_sb);
remote_path_check:
#ifdef CONFIG_CIFS_DFS_UPCALL
git.openpandora.org / pandora-kernel.git / blobdiff