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20232ecfaa
This patch adds the ability for zfs to support file/dir name up to 1023 bytes. This number is chosen so we can support up to 255 4-byte characters. This new feature is represented by the new feature flag feature@longname. A new dataset property "longname" is also introduced to toggle longname support for each dataset individually. This property can be disabled, even if it contains longname files. In such case, new file cannot be created with longname but existing longname files can still be looked up. Note that, to my knowledge native Linux filesystems don't support name longer than 255 bytes. So there might be programs not able to work with longname. Note that NFS server may needs to use exportfs_get_name to reconnect dentries, and the buffer being passed is limit to NAME_MAX+1 (256). So NFS may not work when longname is enabled. Note, FreeBSD vfs layer imposes a limit of 255 name lengh, so even though we add code to support it here, it won't actually work. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Signed-off-by: Chunwei Chen <david.chen@nutanix.com> Closes #15921 |
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