diff options
Diffstat (limited to 'libdiskfs/readonly.c')
| -rw-r--r-- | libdiskfs/readonly.c | 30 |
1 files changed, 22 insertions, 8 deletions
diff --git a/libdiskfs/readonly.c b/libdiskfs/readonly.c index 18ade09a..02f583c8 100644 --- a/libdiskfs/readonly.c +++ b/libdiskfs/readonly.c @@ -1,6 +1,6 @@ /* Change to/from read-only - Copyright (C) 1995, 1996 Free Software Foundation, Inc. + Copyright (C) 1995, 1996, 1997, 1999 Free Software Foundation, Inc. Written by Miles Bader <miles@gnu.ai.mit.edu> @@ -21,21 +21,34 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <fcntl.h> +#include <error.h> #include "priv.h" int _diskfs_diskdirty; +int diskfs_readonly = 0; +int diskfs_hard_readonly = 0; int diskfs_check_readonly () { + error_t err; + if (diskfs_readonly) return 1; else { if (!_diskfs_diskdirty) { - diskfs_set_hypermetadata (1, 0); + err = diskfs_set_hypermetadata (1, 0); + if (err) + { + error (0, 0, + "%s: MEDIA NOT WRITABLE; switching to READ-ONLY", + diskfs_disk_name ?: "-"); + diskfs_hard_readonly = diskfs_readonly = 1; + return 1; + } _diskfs_diskdirty = 1; } return 0; @@ -51,6 +64,9 @@ diskfs_set_readonly (int readonly) { error_t err = 0; + if (diskfs_hard_readonly) + return readonly ? 0 : EROFS; + if (readonly != diskfs_readonly) { err = ports_inhibit_class_rpcs (diskfs_protid_class); @@ -60,15 +76,13 @@ diskfs_set_readonly (int readonly) { error_t peropen_writable (void *pi) { - if (((struct port_info *)pi)->class == diskfs_protid_class - && (((struct protid *)pi)->po->openstat & O_WRITE)) - return EBUSY; - else - return 0; + struct protid *const cred = pi; + return (cred->po->openstat & O_WRITE) ? EBUSY : 0; } /* Any writable open files? */ - err = ports_bucket_iterate (diskfs_port_bucket, peropen_writable); + err = ports_class_iterate (diskfs_protid_class, + peropen_writable); /* Any writable pagers? */ if (!err && (diskfs_max_user_pager_prot () & VM_PROT_WRITE)) |