diff options
author | Matthew Wilcox <matthew.r.wilcox@intel.com> | 2015-02-17 02:58:59 +0300 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-02-17 04:56:03 +0300 |
commit | 289c6aedac981533331428bc933fff21ae332c9e (patch) | |
tree | 1be218c77a0ea9f0a29c130abe1cd23fe5af7ca9 /fs/dax.c | |
parent | d475c6346a38aef3058eba96867bfa726a3cc940 (diff) | |
download | linux-289c6aedac981533331428bc933fff21ae332c9e.tar.xz |
dax,ext2: replace ext2_clear_xip_target with dax_clear_blocks
This is practically generic code; other filesystems will want to call it
from other places, but there's nothing ext2-specific about it.
Make it a little more generic by allowing it to take a count of the number
of bytes to zero rather than fixing it to a single page. Thanks to Dave
Hansen for suggesting that I need to call cond_resched() if zeroing more
than one page.
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Cc: Andreas Dilger <andreas.dilger@intel.com>
Cc: Boaz Harrosh <boaz@plexistor.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/dax.c')
-rw-r--r-- | fs/dax.c | 37 |
1 files changed, 37 insertions, 0 deletions
@@ -20,8 +20,45 @@ #include <linux/fs.h> #include <linux/genhd.h> #include <linux/mutex.h> +#include <linux/sched.h> #include <linux/uio.h> +int dax_clear_blocks(struct inode *inode, sector_t block, long size) +{ + struct block_device *bdev = inode->i_sb->s_bdev; + sector_t sector = block << (inode->i_blkbits - 9); + + might_sleep(); + do { + void *addr; + unsigned long pfn; + long count; + + count = bdev_direct_access(bdev, sector, &addr, &pfn, size); + if (count < 0) + return count; + BUG_ON(size < count); + while (count > 0) { + unsigned pgsz = PAGE_SIZE - offset_in_page(addr); + if (pgsz > count) + pgsz = count; + if (pgsz < PAGE_SIZE) + memset(addr, 0, pgsz); + else + clear_page(addr); + addr += pgsz; + size -= pgsz; + count -= pgsz; + BUG_ON(pgsz & 511); + sector += pgsz / 512; + cond_resched(); + } + } while (size); + + return 0; +} +EXPORT_SYMBOL_GPL(dax_clear_blocks); + static long dax_get_addr(struct buffer_head *bh, void **addr, unsigned blkbits) { unsigned long pfn; |