ocfs2: teach extend/truncate about sparse files

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For ocfs2_truncate_file(), we eliminate the "simple" truncate case which no
longer exists since i_size is not tied to i_clusters. In
ocfs2_extend_file(), we skip the allocation / page zeroing code for file
systems which understand sparse files.

The core truncate code is changed to do a bottom up tree traversal. This
gets abstracted out into it's own function. To make things more readable,
most of the special case handling for in-inode extents from
ocfs2_do_truncate() is also removed.

Though write support for sparse files comes in a later patch, we at least
update ocfs2_prepare_inode_for_write() to skip allocation for sparse files.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

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This commit is contained in:

Mark Fasheh 2007-01-17 12:53:31 -08:00

parent 363041a5f7

commit 3a0782d09c

3 changed files with 320 additions and 237 deletions

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480

fs/ocfs2/alloc.c

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31

fs/ocfs2/file.c

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46

fs/ocfs2/inode.c

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