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fs: new cont helpers

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Rework the generic block "cont" routines to handle the new aops.  Supporting
cont_prepare_write would take quite a lot of code to support, so remove it
instead (and we later convert all filesystems to use it).

write_begin gets passed AOP_FLAG_CONT_EXPAND when called from
generic_cont_expand, so filesystems can avoid the old hacks they used.

Signed-off-by: Nick Piggin <[email protected]>
Cc: OGAWA Hirofumi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Nick Piggin 2007-10-16 01:25:07 -07:00 • committed by Linus Torvalds
commit 89e107877b
4 changed files with 103 additions and 102 deletions
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5
mm/filemap.c
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@ -1684,6 +1684,7 @@ size_t iov_iter_copy_from_user_atomic(struct page *page,
return copied;
}
EXPORT_SYMBOL(iov_iter_copy_from_user_atomic);
/*
* This has the same sideeffects and return value as
@ -1710,6 +1711,7 @@ size_t iov_iter_copy_from_user(struct page *page,
kunmap(page);
return copied;
}
EXPORT_SYMBOL(iov_iter_copy_from_user);
static void __iov_iter_advance_iov(struct iov_iter *i, size_t bytes)
{
@ -1741,6 +1743,7 @@ void iov_iter_advance(struct iov_iter *i, size_t bytes)
__iov_iter_advance_iov(i, bytes);
i->count -= bytes;
}
EXPORT_SYMBOL(iov_iter_advance);
/*
* Fault in the first iovec of the given iov_iter, to a maximum length
@ -1757,6 +1760,7 @@ int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes)
bytes = min(bytes, i->iov->iov_len - i->iov_offset);
return fault_in_pages_readable(buf, bytes);
}
EXPORT_SYMBOL(iov_iter_fault_in_readable);
/*
* Return the count of just the current iov_iter segment.
@ -1769,6 +1773,7 @@ size_t iov_iter_single_seg_count(struct iov_iter *i)
else
return min(i->count, iov->iov_len - i->iov_offset);
}
EXPORT_SYMBOL(iov_iter_single_seg_count);
/*
* Performs necessary checks before doing a write