debugfs: add support for more elaborate ->d_fsdata

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Currently, the user provided fops, "real_fops", are stored directly into
->d_fsdata.

In order to be able to store more per-file state and thus prepare for more
granular file removal protection, wrap the real_fops into a dynamically
allocated container struct, debugfs_fsdata.

A struct debugfs_fsdata gets allocated at file creation and freed from the
newly intoduced ->d_release().

Finally, move the implementation of debugfs_real_fops() out of the public
debugfs header such that struct debugfs_fsdata's declaration can be kept
private.

Signed-off-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Nicolai Stange 2017-10-31 00:15:47 +01:00 • committed by Greg Kroah-Hartman

parent 2ec1615017

commit 7c8d469877

4 changed files with 38 additions and 20 deletions

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12

fs/debugfs/file.c

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22

fs/debugfs/inode.c

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4

fs/debugfs/internal.h

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20

include/linux/debugfs.h

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