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hurd: Avoid file_check_access () RPC for access (F_OK)

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A common use case of access () / faccessat () is checking for file
existence, not any specific access permissions.  In that case, we can
avoid doing the file_check_access () RPC; whether the given path had
been successfully resolved to a file is all we need to know to answer.

This is prompted by GLib switching to use faccessat (F_OK) to implement
g_file_query_exists () for local files.
https://gitlab.gnome.org/GNOME/glib/-/merge_requests/4272

Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-ID: <20240919101439.179663-1-bugaevc@gmail.com>
This commit is contained in:
Sergey Bugaev 2024-09-19 13:14:39 +03:00 committed by Samuel Thibault
parent e64a1e81aa
commit 4524670545
1 changed files with 9 additions and 0 deletions
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9
sysdeps/mach/hurd/faccessat.c
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@ -185,6 +185,15 @@ __faccessat_common (int fd, const char *file, int type, int at_flags,
return errfunc (err);
}
/* If all we wanted was to check for a file existing at the path,
then we already got our answer, and we don't need to call
file_check_access (). */
if (type == F_OK)
{
__mach_port_deallocate (__mach_task_self (), io);
return 0;
}
/* Find out what types of access we are allowed to this file. */
err = __file_check_access (io, &allowed);
__mach_port_deallocate (__mach_task_self (), io);