Patchwork [2/3] getlk problem

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Submitter piastry@etersoft.ru
Date March 28, 2010, 6:20 p.m.
Message ID <201003282220.37430.piastry@etersoft.ru>
Download mbox | patch
Permalink /patch/48785/
State New
Headers show

Comments

piastry@etersoft.ru - March 28, 2010, 6:20 p.m.
В сообщении от 27 марта 2010 04:55:48 вы написали:
> On Wed, 24 Mar 2010 11:56:42 +0300
> 
> piastry@etersoft.ru wrote:
> > diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
> > index 7cc7f83..b3bbb2b 100644
> > --- a/fs/cifs/cifssmb.c
> > +++ b/fs/cifs/cifssmb.c
> > @@ -1793,8 +1793,21 @@ 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 ca2ba7a..d9e8650 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);
> >  
> >  Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com>
> 
> I think this looks reasonable, however it would be preferable to have a
> proper description and SoB line in the right place. That makes it
> easier to pull into the tree. In the future consider using
> git-format-patch to generate them.
> 
> Reviewed-by: Jeff Layton <jlayton@samba.org>

Ok, thanks for advice. See patch in attachment.

--
Best regards,
Pavel Shilovsky.

Patch

From: Pavel Shilovsky <piastryyy@gmail.com>

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 <piastryyy@gmail.com>
Reviewed-by: Jeff Layton <jlayton@samba.org>
---
 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 7cc7f83..b3bbb2b 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -1793,8 +1793,21 @@  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 ca2ba7a..d9e8650 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);
-- 
1.6.6.1