diff options
| author | Jan Kara <jack@suse.cz> | 2010-09-21 11:49:01 +0200 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2010-09-22 09:48:47 +0200 |
| commit | 371d217ee1ff8b418b8f73fb2a34990f951ec2d4 (patch) | |
| tree | 74d5e95a0aa85b8a8b94621b247a78eb527ce609 /drivers | |
| parent | bdi: Initialize noop_backing_dev_info properly (diff) | |
| download | linux-371d217ee1ff8b418b8f73fb2a34990f951ec2d4.tar.xz linux-371d217ee1ff8b418b8f73fb2a34990f951ec2d4.zip | |
char: Mark /dev/zero and /dev/kmem as not capable of writeback
These devices don't do any writeback but their device inodes still can get
dirty so mark bdi appropriately so that bdi code does the right thing and files
inodes to lists of bdi carrying the device inodes.
Cc: stable@kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/mem.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c index a398ecdbd758..1f528fad3516 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -788,10 +788,11 @@ static const struct file_operations zero_fops = { /* * capabilities for /dev/zero * - permits private mappings, "copies" are taken of the source of zeros + * - no writeback happens */ static struct backing_dev_info zero_bdi = { .name = "char/mem", - .capabilities = BDI_CAP_MAP_COPY, + .capabilities = BDI_CAP_MAP_COPY | BDI_CAP_NO_ACCT_AND_WRITEBACK, }; static const struct file_operations full_fops = { |