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nilfs2: support contiguous lookup of blocks

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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>
This commit is contained in:
Ryusuke Konishi 2009-05-25 02:47:14 +09:00
parent fa032744ad
commit c3a7abf06c
5 changed files with 150 additions and 8 deletions
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12
fs/nilfs2/bmap.c
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@ -31,7 +31,7 @@
#include "dat.h"
#include "alloc.h"
static struct inode *nilfs_bmap_get_dat(const struct nilfs_bmap *bmap)
struct inode *nilfs_bmap_get_dat(const struct nilfs_bmap *bmap)
{
return nilfs_dat_inode(NILFS_I_NILFS(bmap->b_inode));
}
@ -58,6 +58,16 @@ int nilfs_bmap_lookup_at_level(struct nilfs_bmap *bmap, __u64 key, int level,
return ret;
}
int nilfs_bmap_lookup_contig(struct nilfs_bmap *bmap, __u64 key, __u64 *ptrp,
unsigned maxblocks)
{
int ret;
down_read(&bmap->b_sem);
ret = bmap->b_ops->bop_lookup_contig(bmap, key, ptrp, maxblocks);
up_read(&bmap->b_sem);
return ret;
}
/**
* nilfs_bmap_lookup - find a record