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author | Pavel Shilovsky <piastry@etersoft.ru> | 2011-05-26 08:02:00 +0200 |
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committer | Steve French <sfrench@us.ibm.com> | 2011-05-27 05:57:16 +0200 |
commit | d4ffff1fa9695c5b5c0bf337e208d8833b88ff2d (patch) | |
tree | acd4b6cfa7962a1cee7e9c81f11bd9ccb0d3ff24 /fs/cifs/cifs_fs_sb.h | |
parent | CIFS: Migrate to shared superblock model (diff) | |
download | linux-d4ffff1fa9695c5b5c0bf337e208d8833b88ff2d.tar.xz linux-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/cifs_fs_sb.h')
-rw-r--r-- | fs/cifs/cifs_fs_sb.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/cifs/cifs_fs_sb.h b/fs/cifs/cifs_fs_sb.h index c96b44b4e262..ffb1459dc6ec 100644 --- a/fs/cifs/cifs_fs_sb.h +++ b/fs/cifs/cifs_fs_sb.h @@ -41,6 +41,7 @@ #define CIFS_MOUNT_MF_SYMLINKS 0x10000 /* Minshall+French Symlinks enabled */ #define CIFS_MOUNT_MULTIUSER 0x20000 /* multiuser mount */ #define CIFS_MOUNT_STRICT_IO 0x40000 /* strict cache mode */ +#define CIFS_MOUNT_RWPIDFORWARD 0x80000 /* use pid forwarding for rw */ struct cifs_sb_info { struct rb_root tlink_tree; |