Hi, This set of patches are aimed to allow truncate_inode_pages_range() handle ranges which are not aligned at the end of the page. Currently it will hit BUG_ON() when the end of the range is not aligned. Punch hole feature however can benefit from this ability saving file systems some work not forcing them to implement their own invalidate code to handle unaligned ranges. In order for this to woke we need change ->invalidatepage() address space operation to to accept range to invalidate by adding 'length' argument in addition to 'offset'. This is different from my previous attempt to create new aop ->invalidatepage_range (http://lwn.net/Articles/514828/) which I reconsidered to ne unnecessary. For description purposes this patch set can be divided into following groups: patch 0001: Change ->invalidatepage() prototype adding 'length' argument and changing all the instances. In very simple cases file system methods are completely adapted, otherwise only prototype is changed and the rest will follow. This patch also implement the 'range' invalidation in block_invalidatepage(). patch 0002 - 0009: Make the use of new 'length' argument in the file system itself. Some file systems can take advantage of it trying to invalidate only portion of the page if possible, some can't, however none of the file systems currently attempt to truncate non page aligned ranges. patch 0010: Teach truncate_inode_pages_range() to handle non page aligned ranges. patch 0012 - 0018: Ext4 changes build on top of previous changes, simplifying punch hole code. Not all changes are realated specifically to invalidatepage() change, but all are related to the punch hole feature. Even though this patch set would mainly affect functionality of the file file systems implementing punch hole I've tested all the following file system using xfstests without noticing any bugs related to this change. ext3, ext4, xfs, btrfs, gfs2 and reiserfs the much smaller changes in other file systems has not been directly tested, so please review. Changes in v2: patch 10/18 - add more comments. Do not initialize at declaration to make things more obvious and better to read. Thanks! -Lukas -- Documentation/filesystems/Locking | 6 +- Documentation/filesystems/vfs.txt | 20 ++-- fs/9p/vfs_addr.c | 5 +- fs/afs/file.c | 10 +- fs/btrfs/disk-io.c | 3 +- fs/btrfs/extent_io.c | 2 +- fs/btrfs/inode.c | 3 +- fs/buffer.c | 21 ++- fs/ceph/addr.c | 15 +- fs/cifs/file.c | 5 +- fs/exofs/inode.c | 6 +- fs/ext3/inode.c | 9 +- fs/ext4/ext4.h | 14 +- fs/ext4/extents.c | 188 ++++++++-------------- fs/ext4/indirect.c | 13 +-- fs/ext4/inode.c | 320 ++++++++++++++++-------------------- fs/f2fs/data.c | 3 +- fs/f2fs/node.c | 3 +- fs/gfs2/aops.c | 17 ++- fs/jbd/transaction.c | 19 ++- fs/jbd2/transaction.c | 24 ++- fs/jfs/jfs_metapage.c | 5 +- fs/logfs/file.c | 3 +- fs/logfs/segment.c | 3 +- fs/nfs/file.c | 8 +- fs/ntfs/aops.c | 2 +- fs/ocfs2/aops.c | 5 +- fs/reiserfs/inode.c | 12 +- fs/ubifs/file.c | 5 +- fs/xfs/xfs_aops.c | 10 +- fs/xfs/xfs_trace.h | 41 +++++- include/linux/buffer_head.h | 3 +- include/linux/fs.h | 2 +- include/linux/jbd.h | 2 +- include/linux/jbd2.h | 2 +- include/linux/mm.h | 3 +- include/trace/events/ext3.h | 12 +- include/trace/events/ext4.h | 64 +++++--- mm/readahead.c | 2 +- mm/truncate.c | 117 ++++++++++---- 40 files changed, 538 insertions(+), 469 deletions(-) [PATCH v2 01/18] mm: change invalidatepage prototype to accept [PATCH v2 02/18] jbd2: change jbd2_journal_invalidatepage to accept [PATCH v2 03/18] ext4: use ->invalidatepage() length argument [PATCH v2 04/18] jbd: change journal_invalidatepage() to accept [PATCH v2 05/18] xfs: use ->invalidatepage() length argument [PATCH v2 06/18] ocfs2: use ->invalidatepage() length argument [PATCH v2 07/18] ceph: use ->invalidatepage() length argument [PATCH v2 08/18] gfs2: use ->invalidatepage() length argument [PATCH v2 09/18] reiserfs: use ->invalidatepage() length argument [PATCH v2 10/18] mm: teach truncate_inode_pages_range() to handle [PATCH v2 11/18] Revert "ext4: remove no longer used functions in [PATCH v2 12/18] Revert "ext4: fix fsx truncate failure" [PATCH v2 13/18] ext4: use ext4_zero_partial_blocks in punch_hole [PATCH v2 14/18] ext4: remove unused discard_partial_page_buffers [PATCH v2 15/18] ext4: remove unused code from ext4_remove_blocks() [PATCH v2 16/18] ext4: update ext4_ext_remove_space trace point [PATCH v2 17/18] ext4: make punch hole code path work with bigalloc [PATCH v2 18/18] ext4: Allow punch hole with bigalloc enabled -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
