ovl: concurrent copy up of regular files

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Now that copy up of regular file is done using O_TMPFILE,
we don't need to hold rename_lock throughout copy up.

Use the copy up waitqueue to synchronize concurrent copy up
of the same file. Different regular files can be copied up
concurrently.

The upper dir inode_lock is taken instead of rename_lock,
because it is needed for lookup and later for linking the
temp file, but it is released while copying up data.

Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

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Amir Goldstein 2017-01-17 06:34:57 +02:00 • committed by Miklos Szeredi

parent 39d3d60a54

commit 01ad3eb8a0

1 changed files with 31 additions and 4 deletions

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fs/overlayfs/copy_up.c

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