linux-kernel - Re: [PATCH 0/6][TAKE4] fallocate system call

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Message-Id: <1179725082.3936.40.camel@localhost.localdomain>
Date:	Sun, 20 May 2007 22:24:42 -0700
From:	Mingming Cao <cmm@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>,
	torvalds@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
	xfs@....sgi.com, suparna@...ibm.com
Subject: Re: [PATCH 0/6][TAKE4] fallocate system call

On Fri, 2007-05-18 at 23:44 -0700, Andrew Morton wrote:
> On Thu, 17 May 2007 19:41:15 +0530 "Amit K. Arora" <aarora@...ux.vnet.ibm.com> wrote:
> 
> > fallocate() is a new system call being proposed here which will allow
> > applications to preallocate space to any file(s) in a file system.
> 
> I merged the first three patches into -mm, thanks.
> 
> All the system call numbers got changed due to recent additions.  They
> may change in the future, too - nothing is stable until the code lands
> in mainline.
> 
In case you haven't realize it, the ia64 fallocate() patch comes with
Amit's takes 4 fallocate patch series (3/6) missing one line change,
thus fail to compile on ia64.

Here is the updated one. Patch tested on ia64. (compile and fsx)

fallocate() on ia64

ia64 fallocate syscall support.

Signed-Off-By: Dave Chinner <dgc@....com>

---
 arch/ia64/kernel/entry.S  |    1 +
 include/asm-ia64/unistd.h |    3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

Index: linux-2.6.22-rc1/arch/ia64/kernel/entry.S
===================================================================
--- linux-2.6.22-rc1.orig/arch/ia64/kernel/entry.S	2007-05-18 16:30:16.000000000 -0700
+++ linux-2.6.22-rc1/arch/ia64/kernel/entry.S	2007-05-18 16:32:45.000000000 -0700
@@ -1585,5 +1585,6 @@
 	data8 sys_getcpu
 	data8 sys_epoll_pwait			// 1305
 	data8 sys_utimensat
+	data8 sys_fallocate
 
 	.org sys_call_table + 8*NR_syscalls	// guard against failures to increase NR_syscalls
Index: linux-2.6.22-rc1/include/asm-ia64/unistd.h
===================================================================
--- linux-2.6.22-rc1.orig/include/asm-ia64/unistd.h	2007-05-18 16:30:16.000000000 -0700
+++ linux-2.6.22-rc1/include/asm-ia64/unistd.h	2007-05-18 17:34:58.000000000 -0700
@@ -296,11 +296,12 @@
 #define __NR_getcpu			1304
 #define __NR_epoll_pwait		1305
 #define __NR_utimensat			1306
+#define __NR_fallocate			1307
 
 #ifdef __KERNEL__
 
 
-#define NR_syscalls			283 /* length of syscall table */
+#define NR_syscalls			285 /* length of syscall table */
 
 #define __ARCH_WANT_SYS_RT_SIGACTION
 #define __ARCH_WANT_SYS_RT_SIGSUSPEND


> I didn't merge any of the ext4 changes as they appear to be in Ted's
> devel tree.  Although I didn't check that they are 100% the same in 
> that tree.
> 
Since both Amit and Ted are traveling, I will jump in...

Most likely it's not the same one. What in Ted's devel tree is "takes 2"
patches.

I have incorporated takes 4 patches in the backing ext4 patch git tree
here:
http://repo.or.cz/w/ext4-patch-queue.git

I have tested these patch series on ia64,ppc64,x86 and x86_64. I am not
sure if Ted got a chance to update his ext4 git tree from this patch
queue git tree yet. 

> What's the plan to get some ext4 updates into mainline, btw?  Things
> seem to be rather gradual.


Last time Ted and I discussed we all agree fallocate patches should go
into mainline. Actually most patches marked before the "unstable
patches" can get into mainline, especially the following patches
(contains a few bug fixes patches)

# New patch to fix whitespace before applying new patches
whitespace.patch
 
#New patch to remove unnecessary exported symbols
ext4_remove_exported_symbles.patch
 
# New patch to add mount option to turn off extents
ext4_noextent_mount_opt.patch
# Now Turn on extents feature by default
ext4_extents_on_by_default.patch
 
#New patch to propagate inode flags
ext4-propagate_flags.patch
 
#New patch to add extent sanity checks
ext4-extent-sanity-checks.patch
 
#New patch to free blocks when failed to insert an extent
ext4-free-blocks-on-insert-extent-failure.patch

We already missed rc-1 window, but if possible, I would like to see ext4
fallocate patches and above patches in mainline 2.6.22. The nanosecond
timestamp patch is probably good to go also.

Regards,
Mingming
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