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fs/9p: v9fs_stat2inode should update suid/sgid bits. 

Create a new helper that update the permission bits and use
that, instead of opencoding the logic.

Reported and bisected by:  M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
Aneesh Kumar K.V 2012-01-05 13:39:49 +05:30 committed by Eric Van Hensbergen
parent 5d3851530d
commit df345c674b
1 changed files with 28 additions and 12 deletions
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40
fs/9p/vfs_inode.c
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@ -94,6 +94,32 @@ static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
return res;
}
/**
* p9mode2perm- convert plan9 mode bits to unix permission bits
* @v9ses: v9fs session information
* @stat: p9_wstat from which mode need to be derived
*
*/
static int p9mode2perm(struct v9fs_session_info *v9ses,
struct p9_wstat *stat)
{
int res;
int mode = stat->mode;
res = mode & S_IALLUGO;
if (v9fs_proto_dotu(v9ses)) {
if ((mode & P9_DMSETUID) == P9_DMSETUID)
res |= S_ISUID;
if ((mode & P9_DMSETGID) == P9_DMSETGID)
res |= S_ISGID;
if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
res |= S_ISVTX;
}
return res;
}
/**
* p9mode2unixmode- convert plan9 mode bits to unix mode bits
* @v9ses: v9fs session information
@ -107,8 +133,8 @@ static int p9mode2unixmode(struct v9fs_session_info *v9ses,
int res;
int mode = stat->mode;
res = mode & S_IALLUGO;
*rdev = 0;
res = p9mode2perm(v9ses, stat);
if ((mode & P9_DMDIR) == P9_DMDIR)
res |= S_IFDIR;
@ -142,16 +168,6 @@ static int p9mode2unixmode(struct v9fs_session_info *v9ses,
} else
res |= S_IFREG;
if (v9fs_proto_dotu(v9ses)) {
if ((mode & P9_DMSETUID) == P9_DMSETUID)
res |= S_ISUID;
if ((mode & P9_DMSETGID) == P9_DMSETGID)
res |= S_ISGID;
if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
res |= S_ISVTX;
}
return res;
}
@ -1168,7 +1184,7 @@ v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
set_nlink(inode, i_nlink);
}
}
mode = stat->mode & S_IALLUGO;
mode = p9mode2perm(v9ses, stat);
mode |= inode->i_mode & ~S_IALLUGO;
inode->i_mode = mode;
i_size_write(inode, stat->length);