From 35fc37d5175091c36d034a28c057da0f9594ee7e Mon Sep 17 00:00:00 2001
From: Jeff Layton <jlayton@redhat.com>
Date: Wed, 14 May 2008 10:22:03 -0700
Subject: [PATCH] add function to convert access flags to legacy open mode
SMBLegacyOpen always opens a file as r/w. This could be problematic
for files with ATTR_READONLY set. Have it interpret the access_mode
into a sane open mode.
Signed-off-by: Steve French <sfrench@us.ibm.com>
---
fs/cifs/cifssmb.c | 22 +++++++++++++++-------
fs/cifs/inode.c | 3 +--
2 files changed, 16 insertions(+), 9 deletions(-)
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 3c05c2de50e1..9c04ad404553 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -1166,6 +1166,20 @@ static __u16 convert_disposition(int disposition)
return ofun;
}
+static int
+access_flags_to_smbopen_mode(const int access_flags)
+{
+ int masked_flags = access_flags & (GENERIC_READ | GENERIC_WRITE);
+
+ if (masked_flags == GENERIC_READ)
+ return SMBOPEN_READ;
+ else if (masked_flags == GENERIC_WRITE)
+ return SMBOPEN_WRITE;
+
+ /* just go for read/write */
+ return SMBOPEN_READWRITE;
+}
+
int
SMBLegacyOpen(const int xid, struct cifsTconInfo *tcon,
const char *fileName, const int openDisposition,
@@ -1207,13 +1221,7 @@ OldOpenRetry:
pSMB->OpenFlags = cpu_to_le16(REQ_BATCHOPLOCK);
pSMB->OpenFlags |= cpu_to_le16(REQ_MORE_INFO);
- /* BB fixme add conversion for access_flags to bits 0 - 2 of mode */
- /* 0 = read
- 1 = write
- 2 = rw
- 3 = execute
- */
- pSMB->Mode = cpu_to_le16(2);
+ pSMB->Mode = cpu_to_le16(access_flags_to_smbopen_mode(access_flags));
pSMB->Mode |= cpu_to_le16(0x40); /* deny none */
/* set file as system file if special file such
as fifo and server expecting SFU style and
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index fcbdbb6ad7bf..2d53b436d511 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1502,8 +1502,7 @@ int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
int oplock = 0;
rc = SMBLegacyOpen(xid, pTcon, full_path,
- FILE_OPEN,
- SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
+ FILE_OPEN, GENERIC_WRITE,
CREATE_NOT_DIR, &netfid, &oplock,
NULL, cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags &
--
2.20.1