add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/cifs/cifsglob.h
..
..
@@ -22,6 +22,8 @@
22
22
 #include <linux/in.h>
23
23
 #include <linux/in6.h>
24
24
 #include <linux/slab.h>
25
+#include <linux/scatterlist.h>
26
+#include <linux/mm.h>
25
27
 #include <linux/mempool.h>
26
28
 #include <linux/workqueue.h>
27
29
 #include "cifs_fs_sb.h"
..
..
@@ -30,6 +32,7 @@
30
32
 #include <linux/scatterlist.h>
31
33
 #include <uapi/linux/cifs/cifs_mount.h>
32
34
 #include "smb2pdu.h"
35
+#include "smb2glob.h"
33
36
 
34
37
 #define CIFS_MAGIC_NUMBER 0xFF534D42      /* the first four bytes of SMB PDUs */
35
38
 
..
..
@@ -2046,4 +2049,70 @@
2046
2049
 		tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT);
2047
2050
 }
2048
2051
 
2052
+static inline unsigned int cifs_get_num_sgs(const struct smb_rqst *rqst,
2053
+					    int num_rqst,
2054
+					    const u8 *sig)
2055
+{
2056
+	unsigned int len, skip;
2057
+	unsigned int nents = 0;
2058
+	unsigned long addr;
2059
+	int i, j;
2060
+
2061
+	/* Assumes the first rqst has a transform header as the first iov.
2062
+	 * I.e.
2063
+	 * rqst[0].rq_iov[0]  is transform header
2064
+	 * rqst[0].rq_iov[1+] data to be encrypted/decrypted
2065
+	 * rqst[1+].rq_iov[0+] data to be encrypted/decrypted
2066
+	 */
2067
+	for (i = 0; i < num_rqst; i++) {
2068
+		/*
2069
+		 * The first rqst has a transform header where the
2070
+		 * first 20 bytes are not part of the encrypted blob.
2071
+		 */
2072
+		for (j = 0; j < rqst[i].rq_nvec; j++) {
2073
+			struct kvec *iov = &rqst[i].rq_iov[j];
2074
+
2075
+			skip = (i == 0) && (j == 0) ? 20 : 0;
2076
+			addr = (unsigned long)iov->iov_base + skip;
2077
+			if (unlikely(is_vmalloc_addr((void *)addr))) {
2078
+				len = iov->iov_len - skip;
2079
+				nents += DIV_ROUND_UP(offset_in_page(addr) + len,
2080
+						      PAGE_SIZE);
2081
+			} else {
2082
+				nents++;
2083
+			}
2084
+		}
2085
+		nents += rqst[i].rq_npages;
2086
+	}
2087
+	nents += DIV_ROUND_UP(offset_in_page(sig) + SMB2_SIGNATURE_SIZE, PAGE_SIZE);
2088
+	return nents;
2089
+}
2090
+
2091
+/* We can not use the normal sg_set_buf() as we will sometimes pass a
2092
+ * stack object as buf.
2093
+ */
2094
+static inline struct scatterlist *cifs_sg_set_buf(struct scatterlist *sg,
2095
+						  const void *buf,
2096
+						  unsigned int buflen)
2097
+{
2098
+	unsigned long addr = (unsigned long)buf;
2099
+	unsigned int off = offset_in_page(addr);
2100
+
2101
+	addr &= PAGE_MASK;
2102
+	if (unlikely(is_vmalloc_addr((void *)addr))) {
2103
+		do {
2104
+			unsigned int len = min_t(unsigned int, buflen, PAGE_SIZE - off);
2105
+
2106
+			sg_set_page(sg++, vmalloc_to_page((void *)addr), len, off);
2107
+
2108
+			off = 0;
2109
+			addr += PAGE_SIZE;
2110
+			buflen -= len;
2111
+		} while (buflen);
2112
+	} else {
2113
+		sg_set_page(sg++, virt_to_page(addr), buflen, off);
2114
+	}
2115
+	return sg;
2116
+}
2117
+
2049
2118
 #endif	/* _CIFS_GLOB_H */