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path: drop IN_ATTRIB from parent directory watches

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When watching a given pathspec, systemd unconditionally installs
IN_ATTRIB watches to track the link count of the resolved file. This
way, we are notified if the watched path disappears, even if the
resolved file inode is not removed.

Similarly, systemd installs inotify watches on each parent directory, to
be notified when the specified path appears. However, for these watches
IN_ATTRIB is an unnecessary addition to the mask. In inotify, IN_ATTRIB
on a directory is emitted whenever the attributes of any child changes,
which, for many paths, has the potential to cause a high number of
spurious wakeups in systemd. Let's remove IN_ATTRIB from the mask when
installing watches on the parent directories of the specified path.

(cherry picked from commit 8bf8c7d83dcffffa55b5f534fb98db6b01315dc1)
(cherry picked from commit fa2b2da1466ff225363c1a0492b1b43c1d01dd8a)
(cherry picked from commit 2818d5a0d679f5205b5a369c8be0b9dfdf9e39eb)
(cherry picked from commit e9db26769ad1e6f6ebb34a5cc0c457b9df0bb932)
This commit is contained in:
Ronan Pigott 2024-07-01 14:07:28 -07:00 committed by Luca Boccassi
parent cbfbcc0202
commit 8f85d9c9bf
1 changed files with 1 additions and 1 deletions
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2
src/core/path.c
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@ -81,7 +81,7 @@ int path_spec_watch(PathSpec *s, sd_event_io_handler_t handler) {
tmp = *cut;
*cut = '\0';
flags = IN_MOVE_SELF | IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO;
flags = IN_MOVE_SELF | IN_DELETE_SELF | IN_CREATE | IN_MOVED_TO;
} else {
cut = NULL;
flags = flags_table[s->type];