Big Sur Ignoring Resource Forks on SMB Shares

Originator:coan.dillahunty
Number:rdar://FB9037109 Date Originated:03/09/2021
Status:Open Resolved:Open
Product:macOS Product Version:macOS 11.2.3
Classification:Bug Reproducible:Always
 
Using a Big Sur client to write and read a file with a Resource Fork to a macOS SMB share.

1. Create an SMB file share on a Catalina (10.15.7) or Big Sur (11.2.3) Mac.
2. Use a Big Sur Mac to copy a file containing a resource fork to the SMB share.
3. Use “ls -al@“ to display the file and xattrs for the file. The resource fork will show up, but will be listed as Zero KB.

Listing from Catalina:
coan@Coans-Mac Arial Test % ls -al@
total 5306
drwx------@ 1 coan  staff    16384 Mar  4 11:18 .
	com.apple.macl	     72 
drwx------  1 coan  staff    16384 Mar  8 11:01 ..
-rwx------  1 coan  staff  1038559 Mar  8 11:01 ._Arial
-rwx------  1 coan  staff   296947 Mar  8 11:01 ._Arial Narrow
-rwx------@ 1 coan  staff        0 Apr 11  2008 Arial
	com.apple.lastuseddate#PS	     16 
	com.apple.FinderInfo	     32 
	com.apple.ResourceFork	1038477 
-rwx------@ 1 coan  staff        0 Apr 11  2008 Arial Narrow
	com.apple.FinderInfo	     32 
	com.apple.ResourceFork	 296865 

Listing from Big Sur:
cdillahunty-mbp:Arial Test cdillahunty$ ls -al@
total 5306
drwx------@ 1 cdillahunty  staff    16384 Mar  4 13:18 .
	com.apple.macl	     72 
drwx------  1 cdillahunty  staff    16384 Mar  8 13:01 ..
-rwx------  1 cdillahunty  staff  1038559 Mar  8 13:01 ._Arial
-rwx------  1 cdillahunty  staff   296947 Mar  8 13:01 ._Arial Narrow
-rwx------@ 1 cdillahunty  staff        0 Apr 11  2008 Arial
	com.apple.lastuseddate#PS	     16 
	com.apple.FinderInfo	     32 
	com.apple.ResourceFork	      0 
-rwx------@ 1 cdillahunty  staff        0 Apr 11  2008 Arial Narrow
	com.apple.FinderInfo	     32 
	com.apple.ResourceFork	      0

Using Big Sur to Access an existing file with a Resource Fork on an SMB share

1. Create an SMB file share on a Catalina (10.15.7) or Big Sur (11.2.3) Mac.
2. Use a Catalina Mac (10.15.7) to copy a file containing a resource fork to the SMB share.
3. Use “ls -al@“ to display the file and xattrs for the file. The resource fork will show up with the correct size.
4. Use a Big Sur Mac (11.2.3) to connect to the same share and file
5. Use “ls -al@“ to display the file and xattrs for the file. The resource fork will show up, but will be listed as Zero KB.

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