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authorMichael I. Bushnell <mib@gnu.org>1994-06-23 17:02:42 +0000
committerMichael I. Bushnell <mib@gnu.org>1994-06-23 17:02:42 +0000
commit0dcd2bff9af6b15abceb3df0a8b9940cc369dc70 (patch)
tree015e1d6d6092bef95dad801b5f970f87ecd898ab
parent7d8cc2eb7ebdaac8e398cb96343d22630241f62d (diff)
Formerly fsys-getroot.c.~10~
-rw-r--r--libtrivfs/fsys-getroot.c90
1 files changed, 80 insertions, 10 deletions
diff --git a/libtrivfs/fsys-getroot.c b/libtrivfs/fsys-getroot.c
index efc820ac..b6e9516f 100644
--- a/libtrivfs/fsys-getroot.c
+++ b/libtrivfs/fsys-getroot.c
@@ -25,6 +25,14 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <fcntl.h>
#include <string.h>
+struct pending_open
+{
+ mach_port_t users_port;
+ mach_port_t reply_port;
+ mach_msg_type_name_t reply_port_type;
+ struct pending_open *next;
+};
+
kern_return_t
trivfs_S_fsys_getroot (struct trivfs_control *cntl,
uid_t *uids, u_int nuids,
@@ -47,10 +55,7 @@ trivfs_S_fsys_getroot (struct trivfs_control *cntl,
if (((flags & O_READ) && !trivfs_support_read)
|| ((flags & O_WRITE) && !trivfs_support_write)
|| ((flags & O_EXEC) && !trivfs_support_exec))
- {
- ports_done_with_port (cntl);
- return EACCES;
- }
+ return EACCES;
/* O_CREAT and O_EXCL are not meaningful here; O_NOLINK and O_NOTRANS
will only be useful when trivfs supports translators (which it doesn't
@@ -65,10 +70,22 @@ trivfs_S_fsys_getroot (struct trivfs_control *cntl,
!= (flags & (O_READ|O_WRITE|O_EXEC)))
{
mach_port_deallocate (mach_task_self (), new_realnode);
- ports_done_with_port (cntl);
return EACCES;
}
+ if (trivfs_check_open_hook)
+ {
+ err = (*trivfs_check_open_hook) (cntl, uids, nuids, gids, ngids, flags);
+ if (err && (err != EWOULDBLOCK
+ || (err == EWOULDBLOCK && (flags & O_NONBLOCK))))
+ {
+ mach_port_deallocate (mach_task_self (), new_realnode);
+ return err;
+ }
+ }
+
+ /* At this point we are commited to the open, now or in the
+ future. */
cred = ports_allocate_port (sizeof (struct trivfs_protid),
cntl->protidtypes);
cred->isroot = 0;
@@ -96,11 +113,64 @@ trivfs_S_fsys_getroot (struct trivfs_control *cntl,
if (trivfs_protid_create_hook)
(*trivfs_protid_create_hook) (cred);
- *do_retry = FS_RETRY_NONE;
- *retry_name = '\0';
- *newpt = ports_get_right (cred);
- *newpttype = MACH_MSG_TYPE_MAKE_SEND;
- return 0;
+ if (err == EWOULDBLOCK)
+ {
+ /* This open request must block. */
+ struct pending_open *pendo;
+ pendo = malloc (sizeof (struct pending_open));
+ pondo->users_port = ports_get_right (cred);
+ pendo->reply_port = reply_port;
+ pendo->reply_port_type = reply_port_type;
+ pendo->next = 0;
+ if (cntl->openstail)
+ cntl->openstail->next = pendo;
+ else
+ cntl->openshead = pendo;
+ cntl->openstail = pendo;
+
+ ports_done_with_port (cntl);
+ return MIG_NO_REPLY;
+ }
+ else
+ {
+ *do_retry = FS_RETRY_NONE;
+ *retry_name = '\0';
+ *newpt = ports_get_right (cred);
+ *newpttype = MACH_MSG_TYPE_MAKE_SEND;
+ return 0;
+ }
}
+void
+trivfs_complete_open (struct trivfs_control *cntl,
+ int multi)
+{
+ struct pending_open *pendo, *nxt;
+
+ if (!multi)
+ {
+ pendo = cntl->openshead;
+ cntl->openshead = pendo->next;
+ if (!cntl->openshead)
+ cntl->openstail = 0;
+
+ fsys_getroot_reply (pendo->reply_port, pendo->reply_port_type, 0,
+ FS_RETRY_NONE, "", pendo->users_port,
+ MACH_MSG_TYPE_MAKE_SEND);
+ free (pendo);
+ }
+ else
+ {
+ for (pendo = cntl->openshead; pendo; pendo = nxt)
+ {
+ fsys_getroot_reply (pendo->reply_port, pendo->reply_port_type, 0,
+ FS_RETRY_NONE, "", pendo->users_port,
+ MACH_MSG_TYPE_MAKE_SEND);
+ nxt = pendo->next;
+ free (pendo);
+ }
+ cntl->openshead = cntl->openstail = 0;
+ }
+}
+