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authorShiyang Ruan <ruansy.fnst@fujitsu.com>2022-06-03 13:37:27 +0800
committerakpm <akpm@linux-foundation.org>2022-07-17 17:14:30 -0700
commit33a8f7f2b3a3437d016d1b4047a4fd37eb6951b3 (patch)
treed806535b3021237977e243f6d86c02fa55a5501b /include/linux/memremap.h
parent00cc790e00369387f6ab80c5724550c2c6340334 (diff)
downloadlinux-33a8f7f2b3a3437d016d1b4047a4fd37eb6951b3.tar.gz
pagemap,pmem: introduce ->memory_failure()
When memory-failure occurs, we call this function which is implemented by each kind of devices. For the fsdax case, pmem device driver implements it. Pmem device driver will find out the filesystem in which the corrupted page located in. With dax_holder notify support, we are able to notify the memory failure from pmem driver to upper layers. If there is something not support in the notify routine, memory_failure will fall back to the generic hanlder. Link: https://lkml.kernel.org/r/20220603053738.1218681-4-ruansy.fnst@fujitsu.com Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Naoya Horiguchi <naoya.horiguchi@nec.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Dan Williams <dan.j.wiliams@intel.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Goldwyn Rodrigues <rgoldwyn@suse.com> Cc: Goldwyn Rodrigues <rgoldwyn@suse.de> Cc: Jane Chu <jane.chu@oracle.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Miaohe Lin <linmiaohe@huawei.com> Cc: Ritesh Harjani <riteshh@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux/memremap.h')
-rw-r--r--include/linux/memremap.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/memremap.h b/include/linux/memremap.h
index 09320b7f706c..19010491a603 100644
--- a/include/linux/memremap.h
+++ b/include/linux/memremap.h
@@ -87,6 +87,18 @@ struct dev_pagemap_ops {
* the page back to a CPU accessible page.
*/
vm_fault_t (*migrate_to_ram)(struct vm_fault *vmf);
+
+ /*
+ * Handle the memory failure happens on a range of pfns. Notify the
+ * processes who are using these pfns, and try to recover the data on
+ * them if necessary. The mf_flags is finally passed to the recover
+ * function through the whole notify routine.
+ *
+ * When this is not implemented, or it returns -EOPNOTSUPP, the caller
+ * will fall back to a common handler called mf_generic_kill_procs().
+ */
+ int (*memory_failure)(struct dev_pagemap *pgmap, unsigned long pfn,
+ unsigned long nr_pages, int mf_flags);
};
#define PGMAP_ALTMAP_VALID (1 << 0)