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ore/exofs: Define new ore_verify_layout

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All users of the ore will need to check if current code
supports the given layout. For example RAID5/6 is not
currently supported.

So move all the checks from exofs/super.c to a new
ore_verify_layout() to be used by ore users.

Note that any new layout should be passed through the
ore_verify_layout() because the ore engine will prepare
and verify some internal members of ore_layout, and
assumes it's called.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
This commit is contained in:
Boaz Harrosh
2011-09-28 13:18:45 +03:00
parent 3bd9856857
commit 5a51c0c7e9
4 changed files with 80 additions and 53 deletions
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9
fs/exofs/inode.c
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@@ -37,11 +37,7 @@
#define EXOFS_DBGMSG2(M...) do {} while (0)
enum { BIO_MAX_PAGES_KMALLOC =
(PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec),
MAX_PAGES_KMALLOC =
PAGE_SIZE / sizeof(struct page *),
};
enum {MAX_PAGES_KMALLOC = PAGE_SIZE / sizeof(struct page *), };
unsigned exofs_max_io_pages(struct ore_layout *layout,
unsigned expected_pages)
@@ -49,8 +45,7 @@ unsigned exofs_max_io_pages(struct ore_layout *layout,
unsigned pages = min_t(unsigned, expected_pages, MAX_PAGES_KMALLOC);
/* TODO: easily support bio chaining */
pages = min_t(unsigned, pages,
layout->group_width * BIO_MAX_PAGES_KMALLOC);
pages = min_t(unsigned, pages, layout->max_io_length / PAGE_SIZE);
return pages;
}