linux/mm
Andrew Morton f79e2abb9b [PATCH] sys_sync_file_range()
Remove the recently-added LINUX_FADV_ASYNC_WRITE and LINUX_FADV_WRITE_WAIT
fadvise() additions, do it in a new sys_sync_file_range() syscall instead.
Reasons:

- It's more flexible.  Things which would require two or three syscalls with
  fadvise() can be done in a single syscall.

- Using fadvise() in this manner is something not covered by POSIX.

The patch wires up the syscall for x86.

The sycall is implemented in the new fs/sync.c.  The intention is that we can
move sys_fsync(), sys_fdatasync() and perhaps sys_sync() into there later.

Documentation for the syscall is in fs/sync.c.

A test app (sync_file_range.c) is in
http://www.zip.com.au/~akpm/linux/patches/stuff/ext3-tools.tar.gz.

The available-to-GPL-modules do_sync_file_range() is for knfsd: "A COMMIT can
say NFS_DATA_SYNC or NFS_FILE_SYNC.  I can skip the ->fsync call for
NFS_DATA_SYNC which is hopefully the more common."

Note: the `async' writeout mode SYNC_FILE_RANGE_WRITE will turn synchronous if
the queue is congested.  This is trivial to fix: add a new flag bit, set
wbc->nonblocking.  But I'm not sure that we want to expose implementation
details down to that level.

Note: it's notable that we can sync an fd which wasn't opened for writing.
Same with fsync() and fdatasync()).

Note: the code takes some care to handle attempts to sync file contents
outside the 16TB offset on 32-bit machines.  It makes such attempts appear to
succeed, for best 32-bit/64-bit compatibility.  Perhaps it should make such
requests fail...

Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Michael Kerrisk <mtk-manpages@gmx.net>
Cc: Ulrich Drepper <drepper@redhat.com>
Cc: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-31 12:18:54 -08:00
..
bootmem.c [PATCH] for_each_online_pgdat: for_each_bootmem 2006-03-27 08:44:47 -08:00
fadvise.c [PATCH] sys_sync_file_range() 2006-03-31 12:18:54 -08:00
filemap.c [PATCH] fadvise(): write commands 2006-03-24 07:33:25 -08:00
filemap.h [PATCH] xip: reduce code duplication 2005-06-24 00:06:41 -07:00
filemap_xip.c [PATCH] replace inode_update_time with file_update_time 2006-01-10 08:01:30 -08:00
fremap.c VM: add common helper function to create the page tables 2005-11-29 14:03:14 -08:00
highmem.c [PATCH] mempool: use common mempool page allocator 2006-03-26 08:56:59 -08:00
hugetlb.c [PATCH] hugetlb: don't allow free hugetlb count fall below reserved count 2006-03-31 12:18:50 -08:00
internal.h [PATCH] remove set_page_count() outside mm/ 2006-03-22 07:54:02 -08:00
Kconfig [PATCH] mm: make page migration dependent on swap and NUMA 2006-03-25 08:22:50 -08:00
madvise.c [PATCH] madvise MADV_DONTFORK/MADV_DOFORK 2006-02-14 16:09:34 -08:00
Makefile [PATCH] uninline zone helpers 2006-03-27 08:44:48 -08:00
memory.c [PATCH] Don't pass boot parameters to argv_init[] 2006-03-31 12:18:53 -08:00
memory_hotplug.c [PATCH] memory hotadd: pgdat->node_present_pages fix 2006-03-09 19:47:38 -08:00
mempolicy.c [PATCH] Typo fixes 2006-03-28 09:16:08 -08:00
mempool.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivial 2006-03-26 09:41:18 -08:00
migrate.c [PATCH] page migration reorg 2006-03-22 07:54:06 -08:00
mincore.c [PATCH] freepgt: sys_mincore ignore FIRST_USER_PGD_NR 2005-04-19 13:29:20 -07:00
mlock.c [PATCH] move capable() to capability.h 2006-01-11 18:42:13 -08:00
mmap.c [PATCH] mm: use kmem_cache_zalloc 2006-03-25 08:22:49 -08:00
mmzone.c [PATCH] uninline zone helpers 2006-03-27 08:44:48 -08:00
mprotect.c [PATCH] Enable mprotect on huge pages 2006-03-22 07:54:03 -08:00
mremap.c [PATCH] move capable() to capability.h 2006-01-11 18:42:13 -08:00
msync.c The comment describing how MS_ASYNC works in msync.c is confusing 2006-03-24 18:30:53 +01:00
nommu.c [PATCH] mm: nommu use compound pages 2006-03-22 07:54:01 -08:00
oom_kill.c [PATCH] out_of_memory() locking fix 2006-03-02 08:33:07 -08:00
page-writeback.c [PATCH] set_page_dirty() return value fixes 2006-03-24 07:33:26 -08:00
page_alloc.c [PATCH] for_each_online_pgdat: remove pgdat_list 2006-03-27 08:44:48 -08:00
page_io.c [PATCH] mm: split page table lock 2005-10-29 21:40:42 -07:00
pdflush.c [PATCH] Swap Migration V5: PF_SWAPWRITE to allow writing to swap 2006-01-08 20:12:41 -08:00
prio_tree.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
readahead.c [PATCH] ext3_readdir: use generic readahead 2006-03-23 07:38:09 -08:00
rmap.c [PATCH] mm: more CONFIG_DEBUG_VM 2006-03-22 07:54:02 -08:00
shmem.c [PATCH] shmem: inline to avoid warning 2006-03-22 07:54:02 -08:00
slab.c [PATCH] for_each_possible_cpu: fixes for generic part 2006-03-28 09:16:05 -08:00
slob.c [PATCH] slab: introduce kmem_cache_zalloc allocator 2006-03-25 08:22:49 -08:00
sparse.c [PATCH] Change maxaligned_in_smp alignemnt macros to internodealigned_in_smp macros 2006-01-08 20:13:38 -08:00
swap.c [PATCH] for_each_possible_cpu: fixes for generic part 2006-03-28 09:16:05 -08:00
swap_state.c [PATCH] page migration reorg 2006-03-22 07:54:06 -08:00
swapfile.c [PATCH] mm: schedule find_trylock_page() removal 2006-03-31 12:18:49 -08:00
thrash.c [PATCH] temporarily disable swap token on memory pressure 2005-11-28 14:42:25 -08:00
tiny-shmem.c [PATCH] do_truncate() call fix in tiny-shmem.c 2006-01-12 09:08:49 -08:00
truncate.c [PATCH] mutex subsystem, semaphore to mutex: VFS, ->i_sem 2006-01-09 15:59:24 -08:00
util.c [PATCH] slab: optimize constant-size kzalloc calls 2006-03-25 08:22:49 -08:00
vmalloc.c [PATCH] kernel-doc: fix warnings in vmalloc.c 2005-11-07 07:53:56 -08:00
vmscan.c [PATCH] for_each_online_pgdat: renaming for_each_pgdat 2006-03-27 08:44:48 -08:00