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| author | Pavel Shilovsky <piastry@etersoft.ru> | 2011-05-26 06:02:00 +0000 |
|---|---|---|
| committer | Steve French <sfrench@us.ibm.com> | 2011-05-27 03:57:16 +0000 |
| commit | d4ffff1fa9695c5b5c0bf337e208d8833b88ff2d (patch) | |
| tree | acd4b6cfa7962a1cee7e9c81f11bd9ccb0d3ff24 /fs/cifs/inode.c | |
| parent | 25c7f41e9234f60af30e086278f1de7974f8816f (diff) | |
| download | lwn-d4ffff1fa9695c5b5c0bf337e208d8833b88ff2d.tar.gz lwn-d4ffff1fa9695c5b5c0bf337e208d8833b88ff2d.zip | |
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.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c index 53ea6250a51d..e2d9dd817ba0 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"); |