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logfs: survive logfs_buf_recover read errors

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Refusing to mount beats a kernel crash.

Signed-off-by: Joern Engel <joern@logfs.org>
This commit is contained in:
Joern Engel
2010-05-03 20:54:34 +02:00
parent ccc0197b02
commit 20503664b0
3 changed files with 13 additions and 11 deletions
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7
fs/logfs/segment.c
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@@ -67,7 +67,7 @@ static struct page *get_mapping_page(struct super_block *sb, pgoff_t index,
return page;
}
void __logfs_buf_write(struct logfs_area *area, u64 ofs, void *buf, size_t len,
int __logfs_buf_write(struct logfs_area *area, u64 ofs, void *buf, size_t len,
int use_filler)
{
pgoff_t index = ofs >> PAGE_SHIFT;
@@ -81,8 +81,10 @@ void __logfs_buf_write(struct logfs_area *area, u64 ofs, void *buf, size_t len,
copylen = min((ulong)len, PAGE_SIZE - offset);
page = get_mapping_page(area->a_sb, index, use_filler);
SetPageUptodate(page);
if (IS_ERR(page))
return PTR_ERR(page);
BUG_ON(!page); /* FIXME: reserve a pool */
SetPageUptodate(page);
memcpy(page_address(page) + offset, buf, copylen);
SetPagePrivate(page);
page_cache_release(page);
@@ -92,6 +94,7 @@ void __logfs_buf_write(struct logfs_area *area, u64 ofs, void *buf, size_t len,
offset = 0;
index++;
} while (len);
return 0;
}
static void pad_partial_page(struct logfs_area *area)