kernfs: invoke kernfs_unmap_bin_file() directly from kernfs_deactivate()

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kernfs_unmap_bin_file() is supposed to unmap all memory mappings of
the target file before kernfs_remove() finishes; however, it currently
is being called from kernfs_addrm_finish() and has the same race
problem as the original implementation of deactivation when there are
multiple removers - only the remover which snatches the node to its
addrm_cxt->removed list is guaranteed to wait for its completion
before returning.

It can be easily fixed by moving kernfs_unmap_bin_file() invocation
from kernfs_addrm_finish() to kernfs_deactivated().  The function may
be called multiple times but that shouldn't do any harm.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Tejun Heo 2014-02-03 14:02:57 -05:00 • committed by Greg Kroah-Hartman

parent 35beab0635

commit ccf02aaf81

1 changed files with 6 additions and 4 deletions

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fs/kernfs/dir.c

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