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| author | Boaz Harrosh <boaz@plexistor.com> | 2015-04-15 16:15:14 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-15 16:35:20 -0700 |
| commit | 0e3b210ce1722168227cb3bc7746256d0c0afece (patch) | |
| tree | 61e29f2d7d7c5e12029cafcbb0c42165a2cc1f20 /fs/ext4/file.c | |
| parent | dd9061846a3ba01b0fa45423aaa087e4a69187fa (diff) | |
| download | linux-0e3b210ce1722168227cb3bc7746256d0c0afece.tar.bz2 | |
dax: use pfn_mkwrite to update c/mtime + freeze protection
From: Yigal Korman <yigal@plexistor.com>
[v1]
Without this patch, c/mtime is not updated correctly when mmap'ed page is
first read from and then written to.
A new xfstest is submitted for testing this (generic/080)
[v2]
Jan Kara has pointed out that if we add the
sb_start/end_pagefault pair in the new pfn_mkwrite we
are then fixing another bug where: A user could start
writing to the page while filesystem is frozen.
Signed-off-by: Yigal Korman <yigal@plexistor.com>
Signed-off-by: Boaz Harrosh <boaz@plexistor.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ext4/file.c')
| -rw-r--r-- | fs/ext4/file.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 598abbbe6786..aa78c70553f4 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -206,6 +206,7 @@ static int ext4_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) static const struct vm_operations_struct ext4_dax_vm_ops = { .fault = ext4_dax_fault, .page_mkwrite = ext4_dax_mkwrite, + .pfn_mkwrite = dax_pfn_mkwrite, }; #else #define ext4_dax_vm_ops ext4_file_vm_ops |