diff --git a/fs/cifs/README b/fs/cifs/README
index 4d01697..6ad722b 100644
--- a/fs/cifs/README
+++ b/fs/cifs/README
@@ -301,8 +301,19 @@ A partial list of the supported mount op
during the local client kernel build will be used.
If server does not support Unicode, this parameter is
unused.
- rsize default read size (usually 16K)
- wsize default write size (usually 16K, 32K is often better over GigE)
+ rsize default read size (usually 16K). The client currently
+ can not use rsize larger than CIFSMaxBufSize. CIFSMaxBufSize
+ defaults to 16K and may be changed (from 8K to the maximum
+ kmalloc size allowed by your kernel) at module install time
+ for cifs.ko. Setting CIFSMaxBufSize to a very large value
+ will cause cifs to use more memory and may reduce performance
+ in some cases. To use rsize greater than 127K (the original
+ cifs protocol maximum) also requires that the server support
+ a new Unix Capability flag (for very large read) which some
+ newer servers (e.g. Samba 3.0.26 or later) do. rsize can be
+ set from a minimum of 2048 to a maximum of 8388608 (depending
+ on the value of CIFSMaxBufSize)
+ wsize default write size (default 57344)
maximum wsize currently allowed by CIFS is 57344 (14 4096 byte
pages)
rw mount the network share read-write (note that the
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index d38c69b..8c4365d 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -732,10 +732,21 @@ cifs_init_request_bufs(void)
/* Buffer size can not be smaller than 2 * PATH_MAX since maximum
Unicode path name has to fit in any SMB/CIFS path based frames */
CIFSMaxBufSize = 8192;
- } else if (CIFSMaxBufSize > 1024*127) {
- CIFSMaxBufSize = 1024 * 127;
} else {
- CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
+ if (CIFSMaxBufSize + MAX_CIFS_HDR_SIZE > KMALLOC_MAX_SIZE) {
+ CIFSMaxBufSize = KMALLOC_MAX_SIZE - MAX_CIFS_HDR_SIZE;
+ cERROR(1,("CIFSMaxBufSize too large, resetting to %ld",
+ KMALLOC_MAX_SIZE));
+ }
+
+ /* The length field is 3 bytes, but for time being we use only
+ * 23 of the available 24 length bits */
+ if (CIFSMaxBufSize > 8388608) {
+ CIFSMaxBufSize = 8388608;
+ cERROR(1,
+ ("CIFSMaxBufSize set to protocol max 8388608"));
+ } else /* round buffer size to even 512 byte multiple */
+ CIFSMaxBufSize &= 0x7FFE00;
}
/* cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
cifs_req_cachep = kmem_cache_create("cifs_request",
diff --git a/fs/cifs/cifspdu.h b/fs/cifs/cifspdu.h
index d619ca7..6e6cda0 100644
--- a/fs/cifs/cifspdu.h
+++ b/fs/cifs/cifspdu.h
@@ -1885,15 +1885,19 @@ typedef struct {
#define CIFS_UNIX_POSIX_PATHNAMES_CAP 0x00000010 /* Allow POSIX path chars */
#define CIFS_UNIX_POSIX_PATH_OPS_CAP 0x00000020 /* Allow new POSIX path based
calls including posix open
- and posix unlink */
+ and posix unlink */
+#define CIFS_UNIX_LARGE_READ_CAP 0x00000040 /* support reads >128K (up
+ to 0xFFFF00 */
+#define CIFS_UNIX_LARGE_WRITE_CAP 0x00000080
+
#ifdef CONFIG_CIFS_POSIX
/* Can not set pathnames cap yet until we send new posix create SMB since
otherwise server can treat such handles opened with older ntcreatex
(by a new client which knows how to send posix path ops)
as non-posix handles (can affect write behavior with byte range locks.
We can add back in POSIX_PATH_OPS cap when Posix Create/Mkdir finished */
-/* #define CIFS_UNIX_CAP_MASK 0x0000003b */
-#define CIFS_UNIX_CAP_MASK 0x0000001b
+/* #define CIFS_UNIX_CAP_MASK 0x000000fb */
+#define CIFS_UNIX_CAP_MASK 0x000000db
#else
#define CIFS_UNIX_CAP_MASK 0x00000013
#endif /* CONFIG_CIFS_POSIX */
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index f4e9266..0ba0d09 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1650,19 +1650,19 @@ void reset_cifs_unix_caps(int xid, struc
}
cap &= CIFS_UNIX_CAP_MASK;
- if(vol_info && vol_info->no_psx_acl)
+ if (vol_info && vol_info->no_psx_acl)
cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
- else if(CIFS_UNIX_POSIX_ACL_CAP & cap) {
+ else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
cFYI(1,("negotiated posix acl support"));
if(sb)
sb->s_flags |= MS_POSIXACL;
}
- if(vol_info && vol_info->posix_paths == 0)
+ if (vol_info && vol_info->posix_paths == 0)
cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
- else if(cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
+ else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
cFYI(1,("negotiate posix pathnames"));
- if(sb)
+ if (sb)
CIFS_SB(sb)->mnt_cifs_flags |=
CIFS_MOUNT_POSIX_PATHS;
}
@@ -1670,21 +1670,32 @@ void reset_cifs_unix_caps(int xid, struc
/* We might be setting the path sep back to a different
form if we are reconnecting and the server switched its
posix path capability for this share */
- if(sb && (CIFS_SB(sb)->prepathlen > 0))
+ if (sb && (CIFS_SB(sb)->prepathlen > 0))
CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
+
+ if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
+ if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
+ CIFS_SB(sb)->rsize = 127 * 1024;
+ }
+ }
+
cFYI(1,("Negotiate caps 0x%x",(int)cap));
#ifdef CONFIG_CIFS_DEBUG2
- if(cap & CIFS_UNIX_FCNTL_CAP)
+ if (cap & CIFS_UNIX_FCNTL_CAP)
cFYI(1,("FCNTL cap"));
- if(cap & CIFS_UNIX_EXTATTR_CAP)
+ if (cap & CIFS_UNIX_EXTATTR_CAP)
cFYI(1,("EXTATTR cap"));
- if(cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
+ if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
cFYI(1,("POSIX path cap"));
- if(cap & CIFS_UNIX_XATTR_CAP)
+ if (cap & CIFS_UNIX_XATTR_CAP)
cFYI(1,("XATTR cap"));
- if(cap & CIFS_UNIX_POSIX_ACL_CAP)
+ if (cap & CIFS_UNIX_POSIX_ACL_CAP)
cFYI(1,("POSIX ACL cap"));
+ if (cap & CIFS_UNIX_LARGE_READ_CAP)
+ cFYI(1,("very large read cap"));
+ if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
+ cFYI(1,("very large write cap"));
#endif /* CIFS_DEBUG2 */
if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
cFYI(1,("setting capabilities failed"));
@@ -1935,7 +1946,8 @@ cifs_mount(struct super_block *sb, struc
cERROR(1,("rsize %d too large, using MaxBufSize",
volume_info.rsize));
cifs_sb->rsize = CIFSMaxBufSize;
- } else if((volume_info.rsize) && (volume_info.rsize <= CIFSMaxBufSize))
+ } else if ((volume_info.rsize) &&
+ (volume_info.rsize <= CIFSMaxBufSize))
cifs_sb->rsize = volume_info.rsize;
else /* default */
cifs_sb->rsize = CIFSMaxBufSize;
@@ -2116,7 +2128,9 @@ cifs_mount(struct super_block *sb, struc
/* tell server which Unix caps we support */
if (tcon->ses->capabilities & CAP_UNIX)
reset_cifs_unix_caps(xid, tcon, sb, &volume_info);
-
+ else if(cifs_sb->rsize > (1024 * 127)) {
+ cifs_sb->rsize = 1024 * 127;
+ }
if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
cifs_sb->wsize = min(cifs_sb->wsize,
(tcon->ses->server->maxBuf -