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authorSteve French <sfrench@us.ibm.com>2009-03-04 19:54:08 +0000
committerSteve French <sfrench@us.ibm.com>2009-03-12 01:36:21 +0000
commit64cc2c63694a03393985ffc8b178e72f52dd8a06 (patch)
tree819161cd3f6b4268b5ff21dfb0c427496134fef5
parent276a74a4835ad86d6da42f3a084b060afc5656e8 (diff)
downloadop-kernel-dev-64cc2c63694a03393985ffc8b178e72f52dd8a06.zip
op-kernel-dev-64cc2c63694a03393985ffc8b178e72f52dd8a06.tar.gz
[CIFS] work around bug in Samba server handling for posix open
Samba server (version 3.3.1 and earlier, and 3.2.8 and earlier) incorrectly required the O_CREAT flag on posix open (even when a file was not being created). This disables posix open (create is still ok) after the first attempt returns EINVAL (and logs an error, once, recommending that they update their server). Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
-rw-r--r--fs/cifs/CHANGES2
-rw-r--r--fs/cifs/cifsglob.h1
-rw-r--r--fs/cifs/file.c16
3 files changed, 16 insertions, 3 deletions
diff --git a/fs/cifs/CHANGES b/fs/cifs/CHANGES
index b33c841..fc977df 100644
--- a/fs/cifs/CHANGES
+++ b/fs/cifs/CHANGES
@@ -11,6 +11,8 @@ to better ensure that we wait for server to write all of the data to
server disk (not just write it over the network). Add new mount
parameter to allow user to disable sending the (slow) SMB flush on
fsync if desired (fsync still flushes all cached write data to the server).
+Posix file open support added (turned off after one attempt if server
+fails to support it properly, as with Samba server versions prior to 3.3.2)
Version 1.56
------------
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 44ff94d..9fbf4df 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -299,6 +299,7 @@ struct cifsTconInfo {
bool unix_ext:1; /* if false disable Linux extensions to CIFS protocol
for this mount even if server would support */
bool local_lease:1; /* check leases (only) on local system not remote */
+ bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
bool need_reconnect:1; /* connection reset, tid now invalid */
/* BB add field for back pointer to sb struct(s)? */
};
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 7bef4cc..81747ac 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -328,7 +328,8 @@ int cifs_open(struct inode *inode, struct file *file)
else
oplock = 0;
- if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
+ if (!tcon->broken_posix_open && tcon->unix_ext &&
+ (tcon->ses->capabilities & CAP_UNIX) &&
(CIFS_UNIX_POSIX_PATH_OPS_CAP &
le64_to_cpu(tcon->fsUnixInfo.Capability))) {
int oflags = (int) cifs_posix_convert_flags(file->f_flags);
@@ -344,11 +345,20 @@ int cifs_open(struct inode *inode, struct file *file)
cifs_posix_open_inode_helper(inode, file, pCifsInode,
pCifsFile, oplock, netfid);
goto out;
+ } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
+ if (tcon->ses->serverNOS)
+ cERROR(1, ("server %s of type %s returned"
+ " unexpected error on SMB posix open"
+ ", disabling posix open support."
+ " Check if server update available.",
+ tcon->ses->serverName,
+ tcon->ses->serverNOS));
+ tcon->broken_posix_open = true;
} else if ((rc != -EIO) && (rc != -EREMOTE) &&
(rc != -EOPNOTSUPP)) /* path not found or net err */
goto out;
- /* fallthrough to retry open the old way on operation
- not supported or DFS errors */
+ /* else fallthrough to retry open the old way on network i/o
+ or DFS errors */
}
desiredAccess = cifs_convert_flags(file->f_flags);
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