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NFS: Don't compare apples to elephants to determine access bits

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The NFS_ACCESS_* flags aren't a 1:1 mapping to the MAY_* flags, so
checking for MAY_WHATEVER might have surprising results in
nfs*_proc_access().  Let's simplify this check when determining which
bits to ask for, and do it in a generic place instead of copying code
for each NFS version.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Anna Schumaker 2017-07-26 12:00:21 -04:00
parent 3c1818275c
commit 1750d929b0
3 changed files with 10 additions and 37 deletions
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19
fs/nfs/nfs4proc.c
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@ -3889,6 +3889,7 @@ static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry
struct nfs4_accessargs args = {
.fh = NFS_FH(inode),
.bitmask = server->cache_consistency_bitmask,
.access = entry->mask,
};
struct nfs4_accessres res = {
.server = server,
@ -3899,26 +3900,8 @@ static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry
.rpc_resp = &res,
.rpc_cred = entry->cred,
};
int mode = entry->mask;
int status = 0;
/*
* Determine which access bits we want to ask for...
*/
if (mode & MAY_READ)
args.access |= NFS4_ACCESS_READ;
if (S_ISDIR(inode->i_mode)) {
if (mode & MAY_WRITE)
args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
if (mode & MAY_EXEC)
args.access |= NFS4_ACCESS_LOOKUP;
} else {
if (mode & MAY_WRITE)
args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
if (mode & MAY_EXEC)
args.access |= NFS4_ACCESS_EXECUTE;
}
res.fattr = nfs_alloc_fattr();
if (res.fattr == NULL)
return -ENOMEM;