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Date:	Mon, 29 Jan 2024 01:32:13 -0700
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Subject:	Re: /usr/bin/fallocate -v -d -l 2 myfile takes forever
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From:	Brian Inglis via Cygwin <cygwin AT cygwin DOT com>
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Cc:	Brian Inglis <Brian DOT Inglis AT SystematicSW DOT ab DOT ca>
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On 2024-01-28 23:44, Cedric Blancher via Cygwin wrote:
> rm -f myfile
> touch myfile
> /usr/bin/fallocate -v -d -l myfile takes forever with latest Cygwin 3.5

It takes much longer without Cygwin 3.5!

Your fallocate(1) option -l has no length numeric argument and no -o offset 
numeric argument to specify the start of the range.

Takes no time on my system when used properly:

$ uname -srvmo
CYGWIN_NT-10.0-19045 3.5.0-0.613.g2c5433e5da82.x86_64 2024-01-24 15:14 UTC 
x86_64 Cygwin
$ smartctl -i /dev/sda
smartctl 7.4 2023-08-01 r5530 [x86_64-pc-cygwin-w10-22H2] (cygwin-7.4-1)
Copyright (C) 2002-23, Bruce Allen, Christian Franke, www.smartmontools.org

Warning: Limited functionality due to missing admin rights
=== START OF INFORMATION SECTION ===
Model Family:     Seagate BarraCuda 3.5 (CMR)
Device Model:     ST1000DM010-2EP102
Serial Number:    W9AAWPXN
Firmware Version: CC43
Device is:        In smartctl database 7.3/5528
ATA Version is:   [No Information Found]
Local Time is:    Mon Jan 29 01:11:59 2024 MST
SMART support is: Available - device has SMART capability.
                   Enabled status cached by OS, trying SMART RETURN STATUS cmd.
SMART support is: Enabled

$ rm -f myfile; touch myfile; llgo myfile
removed 'myfile'
-rw-r--r-- 1 0 Jan 29 00:50 myfile
$ time fallocate -v -o 0 -l 64MiB myfile; llgo myfile

real    0m0.049s
user    0m0.000s
sys     0m0.015s
-rw-r--r-- 1 64M Jan 29 00:50 myfile
$ time fallocate -v -o 0 -l 64MiB -d myfile; llgo myfile
myfile: 64 MiB (67108864 bytes) converted to sparse holes.

real    0m0.146s
user    0m0.015s
sys     0m0.078s
-rw-r--r-- 1 64M Jan 29 00:50 myfile

Now perhaps the fallocate(1) design, option checking, diagnostics, defaults, and 
output, could use some work: using SI multipliers for data sizes (see ls --si!)

Perhaps show some useful commands and output that demonstrate your claim, 
including the actual test release used from `uname -srvmo` and provide some 
information about your drive (type, speed, size) and system, like output from 
`cygcheck -hrsv` attached as a text file?

-- 
Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer     but when there is no more to cut
                                 -- Antoine de Saint-Exupéry


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