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Configure out file locking features

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This patch adds the CONFIG_FILE_LOCKING option which allows to remove
support for advisory locks. With this patch enabled, the flock()
system call, the F_GETLK, F_SETLK and F_SETLKW operations of fcntl()
and NFS support are disabled. These features are not necessarly needed
on embedded systems. It allows to save ~11 Kb of kernel code and data:

   text          data     bss     dec     hex filename
1125436        118764  212992 1457192  163c28 vmlinux.old
1114299        118564  212992 1445855  160fdf vmlinux
 -11137    -200       0  -11337   -2C49 +/-

This patch has originally been written by Matt Mackall
<mpm@selenic.com>, and is part of the Linux Tiny project.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: matthew@wil.cx
Cc: linux-fsdevel@vger.kernel.org
Cc: mpm@selenic.com
Cc: akpm@linux-foundation.org
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Thomas Petazzoni
2008-08-06 15:12:22 +02:00
committed by J. Bruce Fields
parent 04716e6621
commit bfcd17a6c5
6 changed files with 70 additions and 9 deletions
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6
kernel/sysctl.c
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@@ -97,7 +97,7 @@ static int sixty = 60;
static int neg_one = -1;
#endif
#ifdef CONFIG_MMU
#if defined(CONFIG_MMU) && defined(CONFIG_FILE_LOCKING)
static int two = 2;
#endif
@@ -1261,6 +1261,7 @@ static struct ctl_table fs_table[] = {
.extra1 = &minolduid,
.extra2 = &maxolduid,
},
#ifdef CONFIG_FILE_LOCKING
{
.ctl_name = FS_LEASES,
.procname = "leases-enable",
@@ -1269,6 +1270,7 @@ static struct ctl_table fs_table[] = {
.mode = 0644,
.proc_handler = &proc_dointvec,
},
#endif
#ifdef CONFIG_DNOTIFY
{
.ctl_name = FS_DIR_NOTIFY,
@@ -1280,6 +1282,7 @@ static struct ctl_table fs_table[] = {
},
#endif
#ifdef CONFIG_MMU
#ifdef CONFIG_FILE_LOCKING
{
.ctl_name = FS_LEASE_TIME,
.procname = "lease-break-time",
@@ -1291,6 +1294,7 @@ static struct ctl_table fs_table[] = {
.extra1 = &zero,
.extra2 = &two,
},
#endif
{
.procname = "aio-nr",
.data = &aio_nr,