From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx> Update FALLOC_FL_COLLAPSE_RANGE flag in fallocate. Signed-off-by: Namjae Jeon <namjae.jeon@xxxxxxxxxxx> Signed-off-by: Ashish Sangwan <a.sangwan@xxxxxxxxxxx> --- man2/fallocate.2 | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/man2/fallocate.2 b/man2/fallocate.2 index f5c395d..b042c59 100644 --- a/man2/fallocate.2 +++ b/man2/fallocate.2 @@ -7,6 +7,7 @@ .\" .\" 2011-09-19: Added FALLOC_FL_PUNCH_HOLE .\" 2011-09-19: Substantial restructuring of the page +.\" 2013-09-01: Added FALLOC_FL_COLLAPSE_RANGE .\" .TH FALLOCATE 2 2013-06-10 "Linux" "Linux Programmer's Manual" .SH NAME @@ -109,6 +110,19 @@ does not change. Not all filesystems support .BR FALLOC_FL_PUNCH_HOLE ; if a filesystem doesn't support the operation, an error is returned. +.SS Collapsing file space +Specifiying the +.BR FALLOC_FL_COLLAPSE_RANGE +flag in +.I mode +collapse space in the byte range starting at +.I offset +and continuing for +.I len +bytes, where the offset and len are aligned with block size of filesystem. +Within the specified range, it first de-allocates blocks and eliminates +the hole created in this process by shifting data blocks into the hole. + .SH RETURN VALUE On success, .BR fallocate () @@ -139,7 +153,8 @@ was less than 0, or .\" See "Re: [PATCH] fallocate.2: add FALLOC_FL_PUNCH_HOLE flag definition" .\" 21 Sep 2012 .\" http://thread.gmane.org/gmane.linux.file-systems/48331/focus=1193526 -was less than or equal to 0. +was less than or equal to 0 or in case of FALLOC_FL_COLLAPSE_RANGE +offset and len are not aligned with file system's block size. .TP .B EIO An I/O error occurred while reading from or writing to a filesystem. -- 1.7.9.5 -- 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
