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CIFS: Add rwpidforward mount option

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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>
This commit is contained in:
Pavel Shilovsky
2011-05-26 06:02:00 +00:00
committed by Steve French
parent 25c7f41e92
commit d4ffff1fa9
10 changed files with 115 additions and 39 deletions
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fs/cifs/cifssmb.c
+12 -5
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@@ -1382,8 +1382,7 @@ openRetry:
}
int
CIFSSMBRead(const int xid, struct cifsTconInfo *tcon, const int netfid,
const unsigned int count, const __u64 lseek, unsigned int *nbytes,
CIFSSMBRead(const int xid, struct cifs_io_parms *io_parms, unsigned int *nbytes,
char **buf, int *pbuf_type)
{
int rc = -EACCES;
@@ -1393,13 +1392,18 @@ CIFSSMBRead(const int xid, struct cifsTconInfo *tcon, const int netfid,
int wct;
int resp_buf_type = 0;
struct kvec iov[1];
__u32 pid = io_parms->pid;
__u16 netfid = io_parms->netfid;
__u64 offset = io_parms->offset;
struct cifsTconInfo *tcon = io_parms->tcon;
unsigned int count = io_parms->length;
cFYI(1, "Reading %d bytes on fid %d", count, netfid);
if (tcon->ses->capabilities & CAP_LARGE_FILES)
wct = 12;
else {
wct = 10; /* old style read */
if ((lseek >> 32) > 0) {
if ((offset >> 32) > 0) {
/* can not handle this big offset for old */
return -EIO;
}
@@ -1410,15 +1414,18 @@ CIFSSMBRead(const int xid, struct cifsTconInfo *tcon, const int netfid,
if (rc)
return rc;
pSMB->hdr.Pid = cpu_to_le16((__u16)pid);
pSMB->hdr.PidHigh = cpu_to_le16((__u16)(pid >> 16));
/* tcon and ses pointer are checked in smb_init */
if (tcon->ses->server == NULL)
return -ECONNABORTED;
pSMB->AndXCommand = 0xFF; /* none */
pSMB->Fid = netfid;
pSMB->OffsetLow = cpu_to_le32(lseek & 0xFFFFFFFF);
pSMB->OffsetLow = cpu_to_le32(offset & 0xFFFFFFFF);
if (wct == 12)
pSMB->OffsetHigh = cpu_to_le32(lseek >> 32);
pSMB->OffsetHigh = cpu_to_le32(offset >> 32);
pSMB->Remaining = 0;
pSMB->MaxCount = cpu_to_le16(count & 0xFFFF);