From f05337c6ac48d19d354e0640a8eb8fc884f82bcc Mon Sep 17 00:00:00 2001 From: Pavel Shilovsky Date: Mon, 5 Apr 2010 09:59:14 +0400 Subject: [PATCH] not overwriting file_lock structure after GET_LK If we have preventing lock, cifs should overwrite file_lock structure with info about preventing lock. If we haven't preventing lock, cifs should leave it unchanged except for the lock type (change it to F_UNLCK). Signed-off-by: Pavel Shilovsky Reviewed-by: Jeff Layton Signed-off-by: Steve French --- fs/cifs/cifssmb.c | 15 ++++++++++++++- fs/cifs/file.c | 28 ++++++++++++++++++++++++++-- 2 files changed, 40 insertions(+), 3 deletions(-) diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index f213b8ae43c1..184a399749a6 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -1810,8 +1810,21 @@ CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon, } parm_data = (struct cifs_posix_lock *) ((char *)&pSMBr->hdr.Protocol + data_offset); - if (parm_data->lock_type == cpu_to_le16(CIFS_UNLCK)) + if (parm_data->lock_type == __constant_cpu_to_le16(CIFS_UNLCK)) pLockData->fl_type = F_UNLCK; + else { + if (parm_data->lock_type == + __constant_cpu_to_le16(CIFS_RDLCK)) + pLockData->fl_type = F_RDLCK; + else if (parm_data->lock_type == + __constant_cpu_to_le16(CIFS_WRLCK)) + pLockData->fl_type = F_WRLCK; + + pLockData->fl_start = parm_data->start; + pLockData->fl_end = parm_data->start + + parm_data->length - 1; + pLockData->fl_pid = parm_data->pid; + } } plk_err_exit: diff --git a/fs/cifs/file.c b/fs/cifs/file.c index ca2ba7a0193c..d9e86504b9d4 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -838,8 +838,32 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) } else { /* if rc == ERR_SHARING_VIOLATION ? */ - rc = 0; /* do not change lock type to unlock - since range in use */ + rc = 0; + + if (lockType & LOCKING_ANDX_SHARED_LOCK) { + pfLock->fl_type = F_WRLCK; + } else { + rc = CIFSSMBLock(xid, tcon, netfid, length, + pfLock->fl_start, 0, 1, + lockType | LOCKING_ANDX_SHARED_LOCK, + 0 /* wait flag */); + if (rc == 0) { + rc = CIFSSMBLock(xid, tcon, netfid, + length, pfLock->fl_start, 1, 0, + lockType | + LOCKING_ANDX_SHARED_LOCK, + 0 /* wait flag */); + pfLock->fl_type = F_RDLCK; + if (rc != 0) + cERROR(1, ("Error unlocking " + "previously locked range %d " + "during test of lock", rc)); + rc = 0; + } else { + pfLock->fl_type = F_WRLCK; + rc = 0; + } + } } FreeXid(xid); -- 2.30.2