diff options
| -rw-r--r-- | fs/dax.c | 37 | ||||
| -rw-r--r-- | fs/ext2/inode.c | 8 | ||||
| -rw-r--r-- | fs/ext2/xip.c | 14 | ||||
| -rw-r--r-- | fs/ext2/xip.h | 3 | ||||
| -rw-r--r-- | include/linux/fs.h | 1 |
5 files changed, 43 insertions, 20 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; diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c index 3ccd5fd47d66..52978b853226 100644 --- a/fs/ext2/inode.c +++ b/fs/ext2/inode.c @@ -733,10 +733,12 @@ static int ext2_get_blocks(struct inode *inode, if (IS_DAX(inode)) { /* - * we need to clear the block + * block must be initialised before we put it in the tree + * so that it's not found by another thread before it's + * initialised */ - err = ext2_clear_xip_target (inode, - le32_to_cpu(chain[depth-1].key)); + err = dax_clear_blocks(inode, le32_to_cpu(chain[depth-1].key), + 1 << inode->i_blkbits); if (err) { mutex_unlock(&ei->truncate_mutex); goto cleanup; diff --git a/fs/ext2/xip.c b/fs/ext2/xip.c index bbc5fec6ff7f..8cfca3a4cd58 100644 --- a/fs/ext2/xip.c +++ b/fs/ext2/xip.c @@ -42,20 +42,6 @@ __ext2_get_block(struct inode *inode, pgoff_t pgoff, int create, return rc; } -int -ext2_clear_xip_target(struct inode *inode, sector_t block) -{ - void *kaddr; - unsigned long pfn; - long size; - - size = __inode_direct_access(inode, block, &kaddr, &pfn, PAGE_SIZE); - if (size < 0) - return size; - clear_page(kaddr); - return 0; -} - void ext2_xip_verify_sb(struct super_block *sb) { struct ext2_sb_info *sbi = EXT2_SB(sb); diff --git a/fs/ext2/xip.h b/fs/ext2/xip.h index 29be73781419..b2592f2f3c9d 100644 --- a/fs/ext2/xip.h +++ b/fs/ext2/xip.h @@ -7,8 +7,6 @@ #ifdef CONFIG_EXT2_FS_XIP extern void ext2_xip_verify_sb (struct super_block *); -extern int ext2_clear_xip_target (struct inode *, sector_t); - static inline int ext2_use_xip (struct super_block *sb) { struct ext2_sb_info *sbi = EXT2_SB(sb); @@ -19,6 +17,5 @@ int ext2_get_xip_mem(struct address_space *, pgoff_t, int, #else #define ext2_xip_verify_sb(sb) do { } while (0) #define ext2_use_xip(sb) 0 -#define ext2_clear_xip_target(inode, chain) 0 #define ext2_get_xip_mem NULL #endif diff --git a/include/linux/fs.h b/include/linux/fs.h index 241c3c030fb5..8084934a5676 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2589,6 +2589,7 @@ extern int nonseekable_open(struct inode * inode, struct file * filp); ssize_t dax_do_io(int rw, struct kiocb *, struct inode *, struct iov_iter *, loff_t, get_block_t, dio_iodone_t, int flags); +int dax_clear_blocks(struct inode *, sector_t block, long size); #ifdef CONFIG_FS_XIP extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma); |