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From: "Darrick J. Wong" <djwong@kernel.org>
To: djwong@kernel.org, jane.chu@oracle.com
Cc: linux-xfs@vger.kernel.org, hch@infradead.org,
	dan.j.williams@intel.com, linux-fsdevel@vger.kernel.org
Subject: [PATCH 3/5] vfs: add a zero-initialization mode to fallocate
Date: Fri, 17 Sep 2021 18:31:01 -0700	[thread overview]
Message-ID: <163192866125.417973.7293598039998376121.stgit@magnolia> (raw)
In-Reply-To: <163192864476.417973.143014658064006895.stgit@magnolia>

From: Darrick J. Wong <djwong@kernel.org>

Add a new mode to fallocate to zero-initialize all the storage backing a
file.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
 fs/open.c                   |    5 +++++
 include/linux/falloc.h      |    1 +
 include/uapi/linux/falloc.h |    9 +++++++++
 3 files changed, 15 insertions(+)


diff --git a/fs/open.c b/fs/open.c
index daa324606a41..230220b8f67a 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -256,6 +256,11 @@ int vfs_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
 	    (mode & ~FALLOC_FL_INSERT_RANGE))
 		return -EINVAL;
 
+	/* Zeroinit should only be used by itself and keep size must be set. */
+	if ((mode & FALLOC_FL_ZEROINIT_RANGE) &&
+	    (mode != (FALLOC_FL_ZEROINIT_RANGE | FALLOC_FL_KEEP_SIZE)))
+		return -EINVAL;
+
 	/* Unshare range should only be used with allocate mode. */
 	if ((mode & FALLOC_FL_UNSHARE_RANGE) &&
 	    (mode & ~(FALLOC_FL_UNSHARE_RANGE | FALLOC_FL_KEEP_SIZE)))
diff --git a/include/linux/falloc.h b/include/linux/falloc.h
index f3f0b97b1675..4597b416667b 100644
--- a/include/linux/falloc.h
+++ b/include/linux/falloc.h
@@ -29,6 +29,7 @@ struct space_resv {
 					 FALLOC_FL_PUNCH_HOLE |		\
 					 FALLOC_FL_COLLAPSE_RANGE |	\
 					 FALLOC_FL_ZERO_RANGE |		\
+					 FALLOC_FL_ZEROINIT_RANGE |	\
 					 FALLOC_FL_INSERT_RANGE |	\
 					 FALLOC_FL_UNSHARE_RANGE)
 
diff --git a/include/uapi/linux/falloc.h b/include/uapi/linux/falloc.h
index 51398fa57f6c..8144403b6102 100644
--- a/include/uapi/linux/falloc.h
+++ b/include/uapi/linux/falloc.h
@@ -77,4 +77,13 @@
  */
 #define FALLOC_FL_UNSHARE_RANGE		0x40
 
+/*
+ * FALLOC_FL_ZEROINIT_RANGE is used to reinitialize storage backing a file by
+ * writing zeros to it.  Subsequent read and writes should not fail due to any
+ * previous media errors.  Blocks must be not be shared or require copy on
+ * write.  Holes and unwritten extents are left untouched.  This mode must be
+ * used with FALLOC_FL_KEEP_SIZE.
+ */
+#define FALLOC_FL_ZEROINIT_RANGE	0x80
+
 #endif /* _UAPI_FALLOC_H_ */


  parent reply	other threads:[~2021-09-18  1:31 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-18  1:30 [PATCHSET RFC v2 jane 0/5] vfs: enable userspace to reset damaged file storage Darrick J. Wong
2021-09-18  1:30 ` [PATCH 1/5] dax: prepare pmem for use by zero-initializing contents and clearing poisons Darrick J. Wong
2021-09-18 16:54   ` riteshh
2021-09-20 17:22     ` Darrick J. Wong
2021-09-21  4:07       ` riteshh
2021-09-22 18:26         ` Darrick J. Wong
2021-09-22 19:47           ` riteshh
2021-09-22 20:26           ` Dan Williams
2021-09-21  8:34   ` Christoph Hellwig
2021-09-22 18:10     ` Darrick J. Wong
2021-09-18  1:30 ` [PATCH 2/5] iomap: use accelerated zeroing on a block device to zero a file range Darrick J. Wong
2021-09-18 16:55   ` riteshh
2021-09-21  8:29   ` Christoph Hellwig
2021-09-22 18:53     ` Darrick J. Wong
2021-09-21 22:33   ` Dave Chinner
2021-09-22 18:54     ` Darrick J. Wong
2021-09-18  1:31 ` Darrick J. Wong [this message]
2021-09-18 16:58   ` [PATCH 3/5] vfs: add a zero-initialization mode to fallocate riteshh
2021-09-20 17:52   ` Eric Biggers
2021-09-20 18:06     ` Darrick J. Wong
2021-09-21  0:44   ` Dave Chinner
2021-09-21  8:31     ` Christoph Hellwig
2021-09-22  2:16       ` Dan Williams
2021-09-22  2:38         ` Darrick J. Wong
2021-09-22  3:59           ` Dave Chinner
2021-09-22  4:13             ` Darrick J. Wong
2021-09-22  5:49               ` Dave Chinner
2021-09-22 21:27                 ` Darrick J. Wong
2021-09-23  0:02                   ` Darrick J. Wong
2021-09-23  0:44                     ` Darrick J. Wong
2021-09-23  1:42                     ` Dave Chinner
2021-09-23  2:43                       ` Dan Williams
2021-09-23  5:42                         ` Dan Williams
2021-09-23 22:54                           ` Dave Chinner
2021-09-24  1:18                             ` Dan Williams
2021-09-24  1:21                               ` Jane Chu
2021-09-24  1:35                                 ` Darrick J. Wong
2021-09-27 21:07                                   ` Dave Chinner
2021-09-27 21:57                                     ` Jane Chu
2021-09-28  0:08                                       ` Dan Williams
2021-09-22  5:28     ` riteshh
2021-09-18  1:31 ` [PATCH 4/5] xfs: implement FALLOC_FL_ZEROINIT_RANGE Darrick J. Wong
2021-09-18  1:31 ` [PATCH 5/5] ext4: " Darrick J. Wong
2021-09-18 17:07   ` riteshh
2021-09-20 18:11     ` Darrick J. Wong
2021-09-21  6:10       ` riteshh
2021-09-18 18:05 ` [PATCHSET RFC v2 jane 0/5] vfs: enable userspace to reset damaged file storage Dan Williams
2021-09-23  0:51 ` Darrick J. Wong
2021-09-23  1:17   ` Dan Williams

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