Get the actual file size vs apparent size in GO

Question

"fs.sys.Size" (fs being fileStat in the os package) returns the apparent size of a file. This isn't ideal when dealing with sparse files.

Is there a way to get the actual file size in GO? Or all applications are bound to get the converted metadata that represent empty blocks as real ones?

score 4 · Accepted Answer · answered Nov 25 '16 at 15:16

4

Looks like the Stat_t structure filled using stat/fstat calls from the Syscall package is all you need. Just multiply Blocks by 512 to get the disk space consumed.

answered Nov 25 '16 at 15:16

itisravi

3,406
3
23
30

Indeed it does. Thanks. – Amir Keibi Nov 25 '16 at 21:02
Why 512 and why not Blksize? – Varun V May 14 '19 at 18:07
@VarunV st_blksize is not the same as 512. See man page for stat(2), gnu.org/software/libc/manual/html_node/Attribute-Meanings.html etc. – itisravi May 16 '19 at 15:51
Thanks. Clarified now @itisravi – Varun V May 16 '19 at 17:12

Get the actual file size vs apparent size in GO

1 Answers1