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path: root/fs/nilfs2/bmap.h
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2009-06-10nilfs2: support contiguous lookup of blocksRyusuke Konishi
Although get_block() callback function can return extent of contiguous blocks with bh->b_size, nilfs_get_block() function did not support this feature. This adds contiguous lookup feature to the block mapping codes of nilfs, and allows the nilfs_get_blocks() function to return the extent information by applying the feature. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-06-10nilfs2: remove bmap pointer operationsRyusuke Konishi
Previously, the bmap codes of nilfs used three types of function tables. The abuse of indirect function calls decreased source readability and suffered many indirect jumps which would confuse branch prediction of processors. This eliminates one type of the function tables, nilfs_bmap_ptr_operations, which was used to dispatch low level pointer operations of the nilfs bmap. This adds a new integer variable "b_ptr_type" to nilfs_bmap struct, and uses the value to select the pointer operations. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-06-10nilfs2: remove useless b_low and b_high fields from nilfs_bmap structRyusuke Konishi
This will cut off 16 bytes from the nilfs_bmap struct which is embedded in the on-memory inode of nilfs. The b_high field was never used, and the b_low field stores a constant value which can be determined by whether the inode uses btree for block mapping or not. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-06-10nilfs2: move get block functions in bmap.c into btree codesRyusuke Konishi
Two get block function for btree nodes, nilfs_bmap_get_block() and nilfs_bmap_get_new_block(), are called only from the btree codes. This relocation will increase opportunities of compiler optimization. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-06-10nilfs2: remove nilfs_bmap_delete_blockRyusuke Konishi
nilfs_bmap_delete_block() is a wrapper function calling nilfs_btnode_delete(). This removes it for simplicity. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-06-10nilfs2: remove nilfs_bmap_put_blockRyusuke Konishi
nilfs_bmap_put_block() is a wrapper function calling brelse(). This eliminates the wrapper for simplicity. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-06-10nilfs2: unify bmap operations starting use of indirect block addressRyusuke Konishi
This simplifies some low level functions of bmap. Three bmap pointer operations, nilfs_bmap_start_v(), nilfs_bmap_commit_v(), and nilfs_bmap_abort_v(), are unified into one nilfs_bmap_start_v() function. And the related indirect function calls are replaced with it. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-04-07nilfs2: integrated block mappingKoji Sato
This adds structures and operations for the block mapping (bmap for short). NILFS2 uses direct mappings for short files or B-tree based mappings for longer files. Every on-disk data block is held with inodes and managed through this block mapping. The nilfs_bmap structure and a set of functions here provide this capability to the NILFS2 inode. [penberg@cs.helsinki.fi: remove a bunch of bmap wrapper macros] [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Koji Sato <sato.koji@lab.ntt.co.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>