diff options
Diffstat (limited to 'nfs/ops.c')
| -rw-r--r-- | nfs/ops.c | 33 |
1 files changed, 33 insertions, 0 deletions
@@ -409,6 +409,30 @@ netfs_attempt_write (struct netcred *cred, struct node *np, return 0; } +/* See if NAME exists in DIR for CRED. If so, return EEXIST. */ +error_t +verify_nonexistent (struct netcred *cred, struct node *dir, + char *name) +{ + int *p; + void *rpcbuf; + error_t err; + + p = nfs_initialize_rpc (NFSPROC_LOOKUP, cred, 0, &rpcbuf, dir, -1); + p = xdr_encode_fhandle (p, &dir->nn->handle); + p = xdr_encode_string (p, name); + + mutex_lock (&dir->lock); + err = conduct_rpc (&rpcbuf, &p); + if (!err) + err = nfs_error_trans (ntohl (*p++)); + + if (!err) + return EEXIST; + else + return 0; +} + /* Implement the netfs_attempt_lookup callback as described in <hurd/netfs.h>. */ error_t @@ -594,6 +618,11 @@ netfs_attempt_link (struct netcred *cred, struct node *dir, case BLKDEV: case FIFO: case SOCK: + + err = verify_nonexistent (cred, dir, name); + if (err) + return err; + mutex_lock (&dir->lock); p = nfs_initialize_rpc (NFSPROC_CREATE, cred, 0, &rpcbuf, dir, -1); p = xdr_encode_fhandle (p, &dir->nn->handle); @@ -704,6 +733,10 @@ netfs_attempt_create_file (struct netcred *cred, struct node *np, void *rpcbuf; error_t err; + err = verify_nonexistent (cred, np, name); + if (err) + return err; + p = nfs_initialize_rpc (NFSPROC_CREATE, cred, 0, &rpcbuf, np, -1); p = xdr_encode_fhandle (p, &np->nn->handle); p = xdr_encode_string (p, name); |