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authorPavel Shilovsky <piastry@etersoft.ru>2011-05-26 06:02:00 +0000
committerSteve French <sfrench@us.ibm.com>2011-05-27 03:57:16 +0000
commitd4ffff1fa9695c5b5c0bf337e208d8833b88ff2d (patch)
treeacd4b6cfa7962a1cee7e9c81f11bd9ccb0d3ff24 /fs/cifs/inode.c
parent25c7f41e9234f60af30e086278f1de7974f8816f (diff)
downloadop-kernel-dev-d4ffff1fa9695c5b5c0bf337e208d8833b88ff2d.zip
op-kernel-dev-d4ffff1fa9695c5b5c0bf337e208d8833b88ff2d.tar.gz
CIFS: Add rwpidforward mount option
Add rwpidforward mount option that switches on a mode when we forward pid of a process who opened a file to any read and write operation. This can prevent applications like WINE from failing on read or write operation on a previously locked file region from the same netfd from another process if we use mandatory brlock style. It is actual for WINE because during a run of WINE program two processes work on the same netfd - share the same file struct between several VFS fds: 1) WINE-server does open and lock; 2) WINE-application does read and write. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs/inode.c')
-rw-r--r--fs/cifs/inode.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 53ea625..e2d9dd8 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -374,6 +374,7 @@ cifs_sfu_type(struct cifs_fattr *fattr, const unsigned char *path,
__u16 netfid;
struct tcon_link *tlink;
struct cifsTconInfo *tcon;
+ struct cifs_io_parms io_parms;
char buf[24];
unsigned int bytes_read;
char *pbuf;
@@ -405,9 +406,13 @@ cifs_sfu_type(struct cifs_fattr *fattr, const unsigned char *path,
if (rc == 0) {
int buf_type = CIFS_NO_BUFFER;
/* Read header */
- rc = CIFSSMBRead(xid, tcon, netfid,
- 24 /* length */, 0 /* offset */,
- &bytes_read, &pbuf, &buf_type);
+ io_parms.netfid = netfid;
+ io_parms.pid = current->tgid;
+ io_parms.tcon = tcon;
+ io_parms.offset = 0;
+ io_parms.length = 24;
+ rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf,
+ &buf_type);
if ((rc == 0) && (bytes_read >= 8)) {
if (memcmp("IntxBLK", pbuf, 8) == 0) {
cFYI(1, "Block device");
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