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| author | Jan Kara <jack@suse.com> | 2015-12-07 15:10:44 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2015-12-07 15:10:44 -0500 |
| commit | ba5843f51d468644b094674c0317c9ab95632caa (patch) | |
| tree | e2ab7e39a4eff12af5bc9f2b14dafc0f08731727 /fs/ext4/file.c | |
| parent | c86d8db33a922da808a5560aa15ed663a9569b37 (diff) | |
| download | linux-ba5843f51d468644b094674c0317c9ab95632caa.tar.gz linux-ba5843f51d468644b094674c0317c9ab95632caa.tar.bz2 linux-ba5843f51d468644b094674c0317c9ab95632caa.zip | |
ext4: use pre-zeroed blocks for DAX page faults
Make DAX fault path use pre-zeroed blocks to avoid races with extent
conversion and zeroing when two page faults to the same block happen.
Signed-off-by: Jan Kara <jack@suse.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/file.c')
| -rw-r--r-- | fs/ext4/file.c | 20 |
1 files changed, 3 insertions, 17 deletions
diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 0d24ebcd7c9e..749b222e6498 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -193,18 +193,6 @@ out: } #ifdef CONFIG_FS_DAX -static void ext4_end_io_unwritten(struct buffer_head *bh, int uptodate) -{ - struct inode *inode = bh->b_assoc_map->host; - /* XXX: breaks on 32-bit > 16TB. Is that even supported? */ - loff_t offset = (loff_t)(uintptr_t)bh->b_private << inode->i_blkbits; - int err; - if (!uptodate) - return; - WARN_ON(!buffer_unwritten(bh)); - err = ext4_convert_unwritten_extents(NULL, inode, offset, bh->b_size); -} - static int ext4_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf) { int result; @@ -225,8 +213,7 @@ static int ext4_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf) if (IS_ERR(handle)) result = VM_FAULT_SIGBUS; else - result = __dax_fault(vma, vmf, ext4_get_block_dax, - ext4_end_io_unwritten); + result = __dax_fault(vma, vmf, ext4_dax_mmap_get_block, NULL); if (write) { if (!IS_ERR(handle)) @@ -262,7 +249,7 @@ static int ext4_dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr, result = VM_FAULT_SIGBUS; else result = __dax_pmd_fault(vma, addr, pmd, flags, - ext4_get_block_dax, ext4_end_io_unwritten); + ext4_dax_mmap_get_block, NULL); if (write) { if (!IS_ERR(handle)) @@ -283,8 +270,7 @@ static int ext4_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) sb_start_pagefault(inode->i_sb); file_update_time(vma->vm_file); down_read(&EXT4_I(inode)->i_mmap_sem); - err = __dax_mkwrite(vma, vmf, ext4_get_block_dax, - ext4_end_io_unwritten); + err = __dax_mkwrite(vma, vmf, ext4_dax_mmap_get_block, NULL); up_read(&EXT4_I(inode)->i_mmap_sem); sb_end_pagefault(inode->i_sb); |