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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/link.c
parent25c7f41e9234f60af30e086278f1de7974f8816f (diff)
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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/link.c')
-rw-r--r--fs/cifs/link.c22
1 files changed, 14 insertions, 8 deletions
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 1a6a388cf5d8..4682d44b6f5b 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -235,6 +235,7 @@ CIFSQueryMFSymLink(const int xid, struct cifsTconInfo *tcon,
unsigned int bytes_read = 0;
int buf_type = CIFS_NO_BUFFER;
unsigned int link_len = 0;
+ struct cifs_io_parms io_parms;
FILE_ALL_INFO file_info;
rc = CIFSSMBOpen(xid, tcon, searchName, FILE_OPEN, GENERIC_READ,
@@ -253,11 +254,13 @@ CIFSQueryMFSymLink(const int xid, struct cifsTconInfo *tcon,
if (!buf)
return -ENOMEM;
pbuf = buf;
+ io_parms.netfid = netfid;
+ io_parms.pid = current->tgid;
+ io_parms.tcon = tcon;
+ io_parms.offset = 0;
+ io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
- rc = CIFSSMBRead(xid, tcon, netfid,
- CIFS_MF_SYMLINK_FILE_SIZE /* length */,
- 0 /* offset */,
- &bytes_read, &pbuf, &buf_type);
+ rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf, &buf_type);
CIFSSMBClose(xid, tcon, netfid);
if (rc != 0) {
kfree(buf);
@@ -296,6 +299,7 @@ CIFSCheckMFSymlink(struct cifs_fattr *fattr,
__u16 netfid = 0;
struct tcon_link *tlink;
struct cifsTconInfo *pTcon;
+ struct cifs_io_parms io_parms;
u8 *buf;
char *pbuf;
unsigned int bytes_read = 0;
@@ -332,11 +336,13 @@ CIFSCheckMFSymlink(struct cifs_fattr *fattr,
goto out;
}
pbuf = buf;
+ io_parms.netfid = netfid;
+ io_parms.pid = current->tgid;
+ io_parms.tcon = pTcon;
+ io_parms.offset = 0;
+ io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
- rc = CIFSSMBRead(xid, pTcon, netfid,
- CIFS_MF_SYMLINK_FILE_SIZE /* length */,
- 0 /* offset */,
- &bytes_read, &pbuf, &buf_type);
+ rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf, &buf_type);
CIFSSMBClose(xid, pTcon, netfid);
if (rc != 0) {
kfree(buf);