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fs: Add the __data_racy annotation to backing_dev_info.ra_pages

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Some but not all .ra_pages changes happen while block layer I/O is paused
with blk_mq_freeze_queue(). Filesystems may read .ra_pages even while
block layer I/O is paused, e.g. from inside their .fadvise callback.
Annotating all .ra_pages reads with READ_ONCE() would be cumbersome.
Hence, add the __data_racy annotatation to the .ra_pages member
variable.

Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Nilay Shroff <nilay@linux.ibm.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Nilay Shroff <nilay@linux.ibm.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bart Van Assche
2025-11-14 13:04:06 -08:00
committed by Jens Axboe
parent 152c331bcd
commit 42adb2d4ef
1 changed files with 3 additions and 1 deletions
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4
include/linux/backing-dev-defs.h
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@@ -168,7 +168,9 @@ struct backing_dev_info {
u64 id;
struct rb_node rb_node; /* keyed by ->id */
struct list_head bdi_list;
unsigned long ra_pages; /* max readahead in PAGE_SIZE units */
/* max readahead in PAGE_SIZE units */
unsigned long __data_racy ra_pages;
unsigned long io_pages; /* max allowed IO size */
struct kref refcnt; /* Reference counter for the structure */