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authorLukas Czerner <lczerner@redhat.com>2014-03-13 12:07:42 +0400
committerDave Chinner <david@fromorbit.com>2014-03-13 12:07:42 +0400
commit409332b65d3ed8cfa7a8030f1e9d52f372219642 (patch)
tree2a344458c62816f179e9827cdb17c1ae1595dfc7
parente1d8fb88a64c1f8094b9f6c3b6d2d9e6719c970d (diff)
downloadlinux-409332b65d3ed8cfa7a8030f1e9d52f372219642.tar.xz
fs: Introduce FALLOC_FL_ZERO_RANGE flag for fallocate
Introduce new FALLOC_FL_ZERO_RANGE flag for fallocate. This has the same functionality as xfs ioctl XFS_IOC_ZERO_RANGE. It can be used to convert a range of file to zeros preferably without issuing data IO. Blocks should be preallocated for the regions that span holes in the file, and the entire range is preferable converted to unwritten extents - even though file system may choose to zero out the extent or do whatever which will result in reading zeros from the range while the range remains allocated for the file. This can be also used to preallocate blocks past EOF in the same way as with fallocate. Flag FALLOC_FL_KEEP_SIZE which should cause the inode size to remain the same. Signed-off-by: Lukas Czerner <lczerner@redhat.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
-rw-r--r--fs/open.c7
-rw-r--r--include/uapi/linux/falloc.h14
2 files changed, 20 insertions, 1 deletions
diff --git a/fs/open.c b/fs/open.c
index 4a923a547d10..c4465b2f8441 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -232,7 +232,12 @@ int do_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
/* Return error if mode is not supported */
if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
- FALLOC_FL_COLLAPSE_RANGE))
+ FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE))
+ return -EOPNOTSUPP;
+
+ /* Punch hole and zero range are mutually exclusive */
+ if ((mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_ZERO_RANGE)) ==
+ (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_ZERO_RANGE))
return -EOPNOTSUPP;
/* Punch hole must have keep size set */
diff --git a/include/uapi/linux/falloc.h b/include/uapi/linux/falloc.h
index 5ff562ddac0b..d1197ae3723c 100644
--- a/include/uapi/linux/falloc.h
+++ b/include/uapi/linux/falloc.h
@@ -27,4 +27,18 @@
*/
#define FALLOC_FL_COLLAPSE_RANGE 0x08
+/*
+ * FALLOC_FL_ZERO_RANGE is used to convert a range of file to zeros preferably
+ * without issuing data IO. Blocks should be preallocated for the regions that
+ * span holes in the file, and the entire range is preferable converted to
+ * unwritten extents - even though file system may choose to zero out the
+ * extent or do whatever which will result in reading zeros from the range
+ * while the range remains allocated for the file.
+ *
+ * This can be also used to preallocate blocks past EOF in the same way as
+ * with fallocate. Flag FALLOC_FL_KEEP_SIZE should cause the inode
+ * size to remain the same.
+ */
+#define FALLOC_FL_ZERO_RANGE 0x10
+
#endif /* _UAPI_FALLOC_H_ */