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fanotify: Pre-allocate pool of error events

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[ Upstream commit 734a1a5eccc5f7473002b0669f788e135f1f64aa ]

Pre-allocate slots for file system errors to have greater chances of
succeeding, since error events can happen in GFP_NOFS context.  This
patch introduces a group-wide mempool of error events, shared by all
FAN_FS_ERROR marks in this group.

Link: https://lore.kernel.org/r/20211025192746.66445-20-krisman@collabora.com
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Gabriel Krisman Bertazi
2021-10-25 16:27:34 -03:00
committed by Greg Kroah-Hartman
parent eec22d03a9
commit 68aacb60a7
4 changed files with 41 additions and 1 deletions
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2
include/linux/fsnotify_backend.h
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@@ -19,6 +19,7 @@
#include <linux/atomic.h>
#include <linux/user_namespace.h>
#include <linux/refcount.h>
#include <linux/mempool.h>
/*
* IN_* from inotfy.h lines up EXACTLY with FS_*, this is so we can easily
@@ -246,6 +247,7 @@ struct fsnotify_group {
int flags; /* flags from fanotify_init() */
int f_flags; /* event_f_flags from fanotify_init() */
struct ucounts *ucounts;
mempool_t error_events_pool;
} fanotify_data;
#endif /* CONFIG_FANOTIFY */
};