Update FALLOC_FL_INSERT_RANGE flag in fallocate. Signed-off-by: Namjae Jeon <namjae.jeon@xxxxxxxxxxx> Signed-off-by: Ashish Sangwan <a.sangwan@xxxxxxxxxxx> --- man2/fallocate.2 | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 84 insertions(+), 5 deletions(-) diff --git a/man2/fallocate.2 b/man2/fallocate.2 index 0cc1a00..0d31027 100644 --- a/man2/fallocate.2 +++ b/man2/fallocate.2 @@ -228,6 +228,59 @@ ext4, for extent-based files (since Linux 3.15) .IP * SMB3 (since Linux 3.17) .\" commit 30175628bf7f521e9ee31ac98fa6d6fe7441a556 +.SS Increasing file space +flag (available since Linux 4.1) +.\" commit dd46c787788d5bf5b974729d43e4c405814a4c7d +Specifying the +.BR FALLOC_FL_INSERT_RANGE +flag in +.I mode +will increase the file space by inserting a hole within the file size without +overwriting any existing data. +The hole will start at +.I offset +and continue for +.I len +bytes. +For inserting hole inside file, the contents of the file starting at +.I offset +will be shifted towards right by +.I len +bytes. +Inserting a hole inside the file will increase the file size by +.I len +bytes. + +This mode has the same limitation as +.BR FALLOC_FL_COLLAPSE_RANGE +regarding the +granularity of the operation. +If the granularity requirements are not met, +.BR fallocate () +will fail with the error +.BR EINVAL. +If the +.I offset +overlaps with end of file OR if it is greater than end of file, an error is +returned. +For such type of operations, i.e. inserting a hole at the end of file, +.BR ftruncate(2) +should be used. +In case +.IR offset + len +exceeds the maximum file size, errno will be set to +.B EFBIG. + +No other flags may be specified in +.IR mode +in conjunction with +.BR FALLOC_FL_INSERT_RANGE . + +As of Linux 4.1, +.B FALLOC_FL_INSERT_RANGE +is supported by +XFS. +.\" commit a904b1ca5751faf5ece8600e18cd3b674afcca1b .SH RETURN VALUE On success, .BR fallocate () @@ -245,6 +298,12 @@ is not a valid file descriptor, or is not opened for writing. .IR offset + len exceeds the maximum file size. .TP +.B EFBIG +.I mode +is +.BR FALLOC_FL_INSERT_RANGE , +the current file size+len exceeds the maximum file size. +.TP .B EINTR A signal was caught during execution. .TP @@ -273,7 +332,17 @@ reaches or passes the end of the file. .B EINVAL .I mode is -.BR FALLOC_FL_COLLAPSE_RANGE , +.BR FALLOC_FL_INSERT_RANGE +and the range specified by +.I offset +reaches or passes the end of the file. +.TP +.B EINVAL +.I mode +is +.BR FALLOC_FL_COLLAPSE_RANGE +or +.BR FALLOC_FL_INSERT_RANGE , but either .I offset or @@ -282,18 +351,24 @@ is not a multiple of the filesystem block size. .TP .B EINVAL .I mode -contains both +contains either of .B FALLOC_FL_COLLAPSE_RANGE +or +.B FALLOC_FL_INSERT_RANGE and other flags; no other flags are permitted with -.BR FALLOC_FL_COLLAPSE_RANGE . +.BR FALLOC_FL_COLLAPSE_RANGE +or +.BR FALLOC_FL_INSERT_RANGE . .TP .B EINVAL .I mode is .BR FALLOC_FL_COLLAPSE_RANGE or -.BR FALLOC_FL_ZERO_RANGE , +.BR FALLOC_FL_ZERO_RANGE +or +.BR FALLOC_FL_INSERT_RANGE , but the file referred to by .I fd is not a regular file. @@ -345,6 +420,8 @@ specifies .BR FALLOC_FL_PUNCH_HOLE or .BR FALLOC_FL_COLLAPSE_RANGE +or +.BR FALLOC_FL_INSERT_RANGE and the file referred to by .I fd @@ -363,7 +440,9 @@ refers to a pipe or FIFO. .B ETXTBSY .I mode specifies -.BR FALLOC_FL_COLLAPSE_RANGE , +.BR FALLOC_FL_COLLAPSE_RANGE +or +.BR FALLOC_FL_INSERT_RANGE , but the file referred to by .IR fd is currently being executed. -- 1.8.5.5 -- 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
