fsnotify: Detach mark from object list when last reference is dropped

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Instead of removing mark from object list from fsnotify_detach_mark(),
remove the mark when last reference to the mark is dropped. This will
allow fanotify to wait for userspace response to event without having to
hold onto fsnotify_mark_srcu.

To avoid pinning inodes by elevated refcount (and thus e.g. delaying
file deletion) while someone holds mark reference, we detach connector
from the object also from fsnotify_destroy_marks() and not only after
removing last mark from the list as it was now.

Reviewed-by: Miklos Szeredi <mszeredi@redhat.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

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This commit is contained in:

Jan Kara 2016-12-21 12:15:30 +01:00

parent 11375145a7

commit 6b3f05d24d

3 changed files with 105 additions and 77 deletions

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4

include/linux/fsnotify_backend.h

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