This patch adds the relevant documenation for using fallocate with the FALLOC_FL_PUNCH_HOLE mode. This information comes from the implementation of FALLOC_FL_PUNCH_HOLE that I've posted along with this man page update to outline the definition for hole punching. Obviously this patch is dependant upon the current implementation being accepted. Thanks, Signed-off-by: Josef Bacik <josef@xxxxxxxxxx> --- man2/fallocate.2 | 15 ++++++++++++--- 1 files changed, 12 insertions(+), 3 deletions(-) diff --git a/man2/fallocate.2 b/man2/fallocate.2 index 42eefbd..1b28916 100644 --- a/man2/fallocate.2 +++ b/man2/fallocate.2 @@ -31,9 +31,8 @@ bytes. The .I mode -argument determines the operation to be performed on the given range. -Currently only one flag is supported for -.IR mode : +argument determines the operation to be performed on the given range, the +value can be one of the following: .TP .B FALLOC_FL_KEEP_SIZE This flag allocates and initializes to zero the disk space @@ -50,6 +49,16 @@ the file size (as reported by .BR stat (2)) even if it is less than .IR offset + len . +.TP +.B FALLOC_FL_PUNCH_HOLE +This flag de-allocates the disk space within the range specified by +.I offset +and +.IR len . +This call preserves the file size (as reported by +.BR stat (2)), +the only change will be to the amount of space used by the file. After a +successful call, subsequent reads from this range will return 0's. .\" .\" Note from Amit Arora: .\" There were few more flags which were discussed, but none of -- 1.6.6.1 -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
