diff mbox series

[v5,1/5] block: Don't invalidate pagecache for invalid falloc modes

Message ID 20230420004850.297045-2-sarthakkukreti@chromium.org
State New
Headers
Series Introduce block provisioning primitives |

Commit Message

Sarthak Kukreti April 20, 2023, 12:48 a.m. UTC 
  Only call truncate_bdev_range() if the fallocate mode is
supported. This fixes a bug where data in the pagecache
could be invalidated if the fallocate() was called on the
block device with an invalid mode.

Fixes: 25f4c41415e5 ("block: implement (some of) fallocate for block devices")
Signed-off-by: Sarthak Kukreti <sarthakkukreti@chromium.org>
---
 block/fops.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

Comments

Darrick J. Wong April 20, 2023, 1:22 a.m. UTC | #1 
On Wed, Apr 19, 2023 at 05:48:46PM -0700, Sarthak Kukreti wrote:
> Only call truncate_bdev_range() if the fallocate mode is
> supported. This fixes a bug where data in the pagecache
> could be invalidated if the fallocate() was called on the
> block device with an invalid mode.
> 
> Fixes: 25f4c41415e5 ("block: implement (some of) fallocate for block devices")
> Signed-off-by: Sarthak Kukreti <sarthakkukreti@chromium.org>
> ---
>  block/fops.c | 18 ++++++++++--------
>  1 file changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/block/fops.c b/block/fops.c
> index d2e6be4e3d1c..2fd7e8b9ab48 100644
> --- a/block/fops.c
> +++ b/block/fops.c
> @@ -648,25 +648,27 @@ static long blkdev_fallocate(struct file *file, int mode, loff_t start,
>  
>  	filemap_invalidate_lock(inode->i_mapping);
>  
> -	/* Invalidate the page cache, including dirty pages. */
> -	error = truncate_bdev_range(bdev, file->f_mode, start, end);
> -	if (error)
> -		goto fail;
> -
> +	/*
> +	 * Invalidate the page cache, including dirty pages, for valid
> +	 * de-allocate mode calls to fallocate().
> +	 */
>  	switch (mode) {
>  	case FALLOC_FL_ZERO_RANGE:
>  	case FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE:
> -		error = blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT,
> +		error = truncate_bdev_range(bdev, file->f_mode, start, end) ||
> +			blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT,

I'm pretty sure we're supposed to preserve the error codes returned by
both functions.

	error = truncate_bdev_range(...);
	if (!error)
		error = blkdev_issue_zeroout(...);

--D

>  					     len >> SECTOR_SHIFT, GFP_KERNEL,
>  					     BLKDEV_ZERO_NOUNMAP);
>  		break;
>  	case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE:
> -		error = blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT,
> +		error = truncate_bdev_range(bdev, file->f_mode, start, end) ||
> +			blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT,
>  					     len >> SECTOR_SHIFT, GFP_KERNEL,
>  					     BLKDEV_ZERO_NOFALLBACK);
>  		break;
>  	case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE | FALLOC_FL_NO_HIDE_STALE:
> -		error = blkdev_issue_discard(bdev, start >> SECTOR_SHIFT,
> +		error = truncate_bdev_range(bdev, file->f_mode, start, end) ||
> +			blkdev_issue_discard(bdev, start >> SECTOR_SHIFT,
>  					     len >> SECTOR_SHIFT, GFP_KERNEL);
>  		break;
>  	default:
> -- 
> 2.40.0.634.g4ca3ef3211-goog
>
Sarthak Kukreti April 20, 2023, 1:48 a.m. UTC | #2 
Sorry I tried to be too concise :) Updated with a fixed up patch!

Best
Sarhtak

On Wed, Apr 19, 2023 at 6:22 PM Darrick J. Wong <djwong@kernel.org> wrote:
>
> On Wed, Apr 19, 2023 at 05:48:46PM -0700, Sarthak Kukreti wrote:
> > Only call truncate_bdev_range() if the fallocate mode is
> > supported. This fixes a bug where data in the pagecache
> > could be invalidated if the fallocate() was called on the
> > block device with an invalid mode.
> >
> > Fixes: 25f4c41415e5 ("block: implement (some of) fallocate for block devices")
> > Signed-off-by: Sarthak Kukreti <sarthakkukreti@chromium.org>
> > ---
> >  block/fops.c | 18 ++++++++++--------
> >  1 file changed, 10 insertions(+), 8 deletions(-)
> >
> > diff --git a/block/fops.c b/block/fops.c
> > index d2e6be4e3d1c..2fd7e8b9ab48 100644
> > --- a/block/fops.c
> > +++ b/block/fops.c
> > @@ -648,25 +648,27 @@ static long blkdev_fallocate(struct file *file, int mode, loff_t start,
> >
> >       filemap_invalidate_lock(inode->i_mapping);
> >
> > -     /* Invalidate the page cache, including dirty pages. */
> > -     error = truncate_bdev_range(bdev, file->f_mode, start, end);
> > -     if (error)
> > -             goto fail;
> > -
> > +     /*
> > +      * Invalidate the page cache, including dirty pages, for valid
> > +      * de-allocate mode calls to fallocate().
> > +      */
> >       switch (mode) {
> >       case FALLOC_FL_ZERO_RANGE:
> >       case FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE:
> > -             error = blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT,
> > +             error = truncate_bdev_range(bdev, file->f_mode, start, end) ||
> > +                     blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT,
>
> I'm pretty sure we're supposed to preserve the error codes returned by
> both functions.
>
>         error = truncate_bdev_range(...);
>         if (!error)
>                 error = blkdev_issue_zeroout(...);
>
> --D
>
> >                                            len >> SECTOR_SHIFT, GFP_KERNEL,
> >                                            BLKDEV_ZERO_NOUNMAP);
> >               break;
> >       case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE:
> > -             error = blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT,
> > +             error = truncate_bdev_range(bdev, file->f_mode, start, end) ||
> > +                     blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT,
> >                                            len >> SECTOR_SHIFT, GFP_KERNEL,
> >                                            BLKDEV_ZERO_NOFALLBACK);
> >               break;
> >       case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE | FALLOC_FL_NO_HIDE_STALE:
> > -             error = blkdev_issue_discard(bdev, start >> SECTOR_SHIFT,
> > +             error = truncate_bdev_range(bdev, file->f_mode, start, end) ||
> > +                     blkdev_issue_discard(bdev, start >> SECTOR_SHIFT,
> >                                            len >> SECTOR_SHIFT, GFP_KERNEL);
> >               break;
> >       default:
> > --
> > 2.40.0.634.g4ca3ef3211-goog
> >
kernel test robot April 24, 2023, 3:54 p.m. UTC | #3 
Hi Sarthak,

kernel test robot noticed the following build warnings:

[auto build test WARNING on device-mapper-dm/for-next]
[also build test WARNING on linus/master v6.3 next-20230421]
[cannot apply to axboe-block/for-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Sarthak-Kukreti/block-Introduce-provisioning-primitives/20230420-095025
base:   https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git for-next
patch link:    https://lore.kernel.org/r/20230420004850.297045-2-sarthakkukreti%40chromium.org
patch subject: [PATCH v5 1/5] block: Don't invalidate pagecache for invalid falloc modes
config: hexagon-randconfig-r006-20230424 (https://download.01.org/0day-ci/archive/20230424/202304242302.5zYRfUub-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 437b7602e4a998220871de78afcb020b9c14a661)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/8bd0744b438be1722c5f8c1fe077e9dcef0e81b7
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Sarthak-Kukreti/block-Introduce-provisioning-primitives/20230420-095025
        git checkout 8bd0744b438be1722c5f8c1fe077e9dcef0e81b7
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304242302.5zYRfUub-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from block/fops.c:9:
   In file included from include/linux/blkdev.h:9:
   In file included from include/linux/blk_types.h:10:
   In file included from include/linux/bvec.h:10:
   In file included from include/linux/highmem.h:12:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/hexagon/include/asm/io.h:334:
   include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __raw_readb(PCI_IOBASE + addr);
                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
                                                     ^
   In file included from block/fops.c:9:
   In file included from include/linux/blkdev.h:9:
   In file included from include/linux/blk_types.h:10:
   In file included from include/linux/bvec.h:10:
   In file included from include/linux/highmem.h:12:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/hexagon/include/asm/io.h:334:
   include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
                                                     ^
   In file included from block/fops.c:9:
   In file included from include/linux/blkdev.h:9:
   In file included from include/linux/blk_types.h:10:
   In file included from include/linux/bvec.h:10:
   In file included from include/linux/highmem.h:12:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/hexagon/include/asm/io.h:334:
   include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writeb(value, PCI_IOBASE + addr);
                               ~~~~~~~~~~ ^
   include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
>> block/fops.c:678:2: warning: unused label 'fail' [-Wunused-label]
    fail:
    ^~~~~
   7 warnings generated.


vim +/fail +678 block/fops.c

cd82cca7ebfe9c Christoph Hellwig 2021-09-07  613  
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  614  #define	BLKDEV_FALLOC_FL_SUPPORTED					\
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  615  		(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |		\
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  616  		 FALLOC_FL_ZERO_RANGE | FALLOC_FL_NO_HIDE_STALE)
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  617  
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  618  static long blkdev_fallocate(struct file *file, int mode, loff_t start,
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  619  			     loff_t len)
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  620  {
f278eb3d8178f9 Ming Lei          2021-09-23  621  	struct inode *inode = bdev_file_inode(file);
f278eb3d8178f9 Ming Lei          2021-09-23  622  	struct block_device *bdev = I_BDEV(inode);
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  623  	loff_t end = start + len - 1;
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  624  	loff_t isize;
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  625  	int error;
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  626  
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  627  	/* Fail if we don't recognize the flags. */
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  628  	if (mode & ~BLKDEV_FALLOC_FL_SUPPORTED)
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  629  		return -EOPNOTSUPP;
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  630  
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  631  	/* Don't go off the end of the device. */
2a93ad8fcb377b Christoph Hellwig 2021-10-18  632  	isize = bdev_nr_bytes(bdev);
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  633  	if (start >= isize)
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  634  		return -EINVAL;
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  635  	if (end >= isize) {
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  636  		if (mode & FALLOC_FL_KEEP_SIZE) {
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  637  			len = isize - start;
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  638  			end = start + len - 1;
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  639  		} else
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  640  			return -EINVAL;
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  641  	}
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  642  
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  643  	/*
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  644  	 * Don't allow IO that isn't aligned to logical block size.
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  645  	 */
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  646  	if ((start | len) & (bdev_logical_block_size(bdev) - 1))
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  647  		return -EINVAL;
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  648  
f278eb3d8178f9 Ming Lei          2021-09-23  649  	filemap_invalidate_lock(inode->i_mapping);
f278eb3d8178f9 Ming Lei          2021-09-23  650  
8bd0744b438be1 Sarthak Kukreti   2023-04-19  651  	/*
8bd0744b438be1 Sarthak Kukreti   2023-04-19  652  	 * Invalidate the page cache, including dirty pages, for valid
8bd0744b438be1 Sarthak Kukreti   2023-04-19  653  	 * de-allocate mode calls to fallocate().
8bd0744b438be1 Sarthak Kukreti   2023-04-19  654  	 */
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  655  	switch (mode) {
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  656  	case FALLOC_FL_ZERO_RANGE:
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  657  	case FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE:
8bd0744b438be1 Sarthak Kukreti   2023-04-19  658  		error = truncate_bdev_range(bdev, file->f_mode, start, end) ||
8bd0744b438be1 Sarthak Kukreti   2023-04-19  659  			blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT,
6549a874fb65e7 Pavel Begunkov    2021-10-20  660  					     len >> SECTOR_SHIFT, GFP_KERNEL,
6549a874fb65e7 Pavel Begunkov    2021-10-20  661  					     BLKDEV_ZERO_NOUNMAP);
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  662  		break;
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  663  	case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE:
8bd0744b438be1 Sarthak Kukreti   2023-04-19  664  		error = truncate_bdev_range(bdev, file->f_mode, start, end) ||
8bd0744b438be1 Sarthak Kukreti   2023-04-19  665  			blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT,
6549a874fb65e7 Pavel Begunkov    2021-10-20  666  					     len >> SECTOR_SHIFT, GFP_KERNEL,
6549a874fb65e7 Pavel Begunkov    2021-10-20  667  					     BLKDEV_ZERO_NOFALLBACK);
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  668  		break;
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  669  	case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE | FALLOC_FL_NO_HIDE_STALE:
8bd0744b438be1 Sarthak Kukreti   2023-04-19  670  		error = truncate_bdev_range(bdev, file->f_mode, start, end) ||
8bd0744b438be1 Sarthak Kukreti   2023-04-19  671  			blkdev_issue_discard(bdev, start >> SECTOR_SHIFT,
44abff2c0b970a Christoph Hellwig 2022-04-15  672  					     len >> SECTOR_SHIFT, GFP_KERNEL);
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  673  		break;
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  674  	default:
f278eb3d8178f9 Ming Lei          2021-09-23  675  		error = -EOPNOTSUPP;
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  676  	}
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  677  
f278eb3d8178f9 Ming Lei          2021-09-23 @678   fail:
f278eb3d8178f9 Ming Lei          2021-09-23  679  	filemap_invalidate_unlock(inode->i_mapping);
f278eb3d8178f9 Ming Lei          2021-09-23  680  	return error;
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  681  }
cd82cca7ebfe9c Christoph Hellwig 2021-09-07  682
Liu, Yujie May 4, 2023, 8:50 a.m. UTC | #4 
Hello,

kernel test robot noticed "xfstests.generic.351.fail" on:

commit: 8bd0744b438be1722c5f8c1fe077e9dcef0e81b7 ("[PATCH v5 1/5] block: Don't invalidate pagecache for invalid falloc modes")
url: https://github.com/intel-lab-lkp/linux/commits/Sarthak-Kukreti/block-Introduce-provisioning-primitives/20230420-095025
base: https://git.kernel.org/cgit/linux/kernel/git/device-mapper/linux-dm.git for-next
patch link: https://lore.kernel.org/all/20230420004850.297045-2-sarthakkukreti@chromium.org/
patch subject: [PATCH v5 1/5] block: Don't invalidate pagecache for invalid falloc modes

in testcase: xfstests
version: xfstests-x86_64-a7df89e-1_20230410
with following parameters:

	disk: 4HDD
	fs: xfs
	test: generic-group-17

compiler: gcc-11
test machine: 4 threads Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz (Skylake) with 32G memory

(please refer to attached dmesg/kmsg for entire log/backtrace)


If you fix the issue, kindly add following tag
| Reported-by: kernel test robot <yujie.liu@intel.com>
| Link: https://lore.kernel.org/oe-lkp/202305041600.1633e4ac-yujie.liu@intel.com


generic/351       - output mismatch (see /lkp/benchmarks/xfstests/results//generic/351.out.bad)
    --- tests/generic/351.out	2023-04-10 17:18:19.000000000 +0000
    +++ /lkp/benchmarks/xfstests/results//generic/351.out.bad	2023-04-28 03:22:46.227470830 +0000
    @@ -25,7 +25,7 @@
     Destroy device
     Create w/o unmap or writesame and format
     Zero punch, no fallback available
    -fallocate: Operation not supported
    +fallocate: No such file or directory
     Zero range, write fallback
     Check contents
    ...
    (Run 'diff -u /lkp/benchmarks/xfstests/tests/generic/351.out /lkp/benchmarks/xfstests/results//generic/351.out.bad'  to see the entire diff)


QA output created by 351
Create and format
Regular fallocate
fallocate: Operation not supported
Insert range
fallocate: Operation not supported
Collapse range
fallocate: Operation not supported
Unaligned zero range
fallocate: Invalid argument
Unaligned punch
fallocate: Invalid argument
Zero range past MAX_LFS_FILESIZE keep size
fallocate: File too large
Zero range past MAX_LFS_FILESIZE
fallocate: File too large
Zero range to MAX_LFS_FILESIZE fail w/o keepsize
fallocate: Invalid argument
Zero range starts past EOD
fallocate: Invalid argument
Punch starts past EOD
fallocate: Invalid argument
Check contents
b83f9394092e15bdcda585cd8e776dc6  SCSI_DEBUG_DEV
Destroy device
Create w/o unmap or writesame and format
Zero punch, no fallback available
fallocate: No such file or directory
Zero range, write fallback
Check contents
0fc6bc93cd0cd97e3cde5ea39ea1185d  SCSI_DEBUG_DEV
Destroy device
diff mbox series

Patch

diff --git a/block/fops.c b/block/fops.c
index d2e6be4e3d1c..2fd7e8b9ab48 100644
--- a/block/fops.c
+++ b/block/fops.c
@@ -648,25 +648,27 @@  static long blkdev_fallocate(struct file *file, int mode, loff_t start,
 
 	filemap_invalidate_lock(inode->i_mapping);
 
-	/* Invalidate the page cache, including dirty pages. */
-	error = truncate_bdev_range(bdev, file->f_mode, start, end);
-	if (error)
-		goto fail;
-
+	/*
+	 * Invalidate the page cache, including dirty pages, for valid
+	 * de-allocate mode calls to fallocate().
+	 */
 	switch (mode) {
 	case FALLOC_FL_ZERO_RANGE:
 	case FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE:
-		error = blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT,
+		error = truncate_bdev_range(bdev, file->f_mode, start, end) ||
+			blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT,
 					     len >> SECTOR_SHIFT, GFP_KERNEL,
 					     BLKDEV_ZERO_NOUNMAP);
 		break;
 	case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE:
-		error = blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT,
+		error = truncate_bdev_range(bdev, file->f_mode, start, end) ||
+			blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT,
 					     len >> SECTOR_SHIFT, GFP_KERNEL,
 					     BLKDEV_ZERO_NOFALLBACK);
 		break;
 	case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE | FALLOC_FL_NO_HIDE_STALE:
-		error = blkdev_issue_discard(bdev, start >> SECTOR_SHIFT,
+		error = truncate_bdev_range(bdev, file->f_mode, start, end) ||
+			blkdev_issue_discard(bdev, start >> SECTOR_SHIFT,
 					     len >> SECTOR_SHIFT, GFP_KERNEL);
 		break;
 	default: