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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>
This commit is contained in:
Jeff Layton 2008-05-14 10:22:03 -07:00 committed by Steve French
parent e10f7b551d
commit 35fc37d517
2 changed files with 16 additions and 9 deletions
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22
fs/cifs/cifssmb.c
View File

@ -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

3
fs/cifs/inode.c
View File

@ -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 &