vfs: introduce inode 'inuse' lock

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Added an i_state flag I_INUSE and helpers to set/clear/test the bit.

The 'inuse' lock is an 'advisory' inode lock, that can be used to extend
exclusive create protection beyond parent->i_mutex lock among cooperating
users.

This is going to be used by overlayfs to get exclusive ownership on upper
and work dirs among overlayfs mounts.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

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Amir Goldstein 2017-06-21 15:28:32 +03:00 • committed by Miklos Szeredi

parent 04a01ac7ed

commit ad0af7104d

3 changed files with 37 additions and 0 deletions

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include/linux/fs.h

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