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fs: add ksys_close() wrapper; remove in-kernel calls to sys_close()

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Using the ksys_close() wrapper allows us to get rid of in-kernel calls
to the sys_close() syscall. The ksys_ prefix denotes that this function
is meant as a drop-in replacement for the syscall. In particular, it
uses the same calling convention as sys_close(), with one subtle
difference:

The few places which checked the return value did not care about the return
value re-writing in sys_close(), so simply use a wrapper around
__close_fd().

This patch is part of a series which removes in-kernel calls to syscalls.
On this basis, the syscall entry path can be streamlined. For details, see
http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net

Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
This commit is contained in:
Dominik Brodowski
2018-03-11 11:34:55 +01:00
parent 411d9475cf
commit 2ca2a09d62
10 changed files with 29 additions and 17 deletions
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6
init/do_mounts_rd.c
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@@ -257,7 +257,7 @@ int __init rd_load_image(char *from)
if (i && (i % devblocks == 0)) {
printk("done disk #%d.\n", disk++);
rotate = 0;
if (sys_close(in_fd)) {
if (ksys_close(in_fd)) {
printk("Error closing the disk.\n");
goto noclose_input;
}
@@ -283,9 +283,9 @@ int __init rd_load_image(char *from)
successful_load:
res = 1;
done:
sys_close(in_fd);
ksys_close(in_fd);
noclose_input:
sys_close(out_fd);
ksys_close(out_fd);
out:
kfree(buf);
ksys_unlink("/dev/ram");