Messages in this thread Patch in this message | | | From | Mike Kravetz <> | Subject | [PATCH v2 1/4] mm/hugetlb: Define hugetlb_falloc structure for hole punch race | Date | Tue, 20 Oct 2015 16:52:19 -0700 |
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A hugetlb_falloc structure is pointed to by i_private during fallocate hole punch operations. Page faults check this structure and if they are in the hole, wait for the operation to finish.
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com> --- include/linux/hugetlb.h | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 685c262..4be35b9 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -42,6 +42,16 @@ struct resv_map { extern struct resv_map *resv_map_alloc(void); void resv_map_release(struct kref *ref); +/* + * hugetlb_falloc is used to prevent page faults during falloc hole punch + * operations. During hole punch, inode->i_private points to this struct. + */ +struct hugetlb_falloc { + wait_queue_head_t *waitq; /* Page faults waiting on hole punch */ + pgoff_t start; /* Start of fallocate hole */ + pgoff_t end; /* End of fallocate hole */ +}; + extern spinlock_t hugetlb_lock; extern int hugetlb_max_hstate __read_mostly; #define for_each_hstate(h) \ -- 2.4.3
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