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nilfs2: add palloc cache to dat

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This adds the palloc cache to DAT file.  The palloc cache is allocated
on the extended region of nilfs_mdt_info struct.  The struct
nilfs_dat_info defines the extended on memory structure of DAT.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Ryusuke Konishi 2009-11-14 16:35:01 +09:00
parent db38d5ad32
commit 8908b2f70b
1 changed files with 16 additions and 2 deletions
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18
fs/nilfs2/dat.c
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@ -33,6 +33,16 @@
#define NILFS_CNO_MIN ((__u64)1)
#define NILFS_CNO_MAX (~(__u64)0)
struct nilfs_dat_info {
struct nilfs_mdt_info mi;
struct nilfs_palloc_cache palloc_cache;
};
static inline struct nilfs_dat_info *NILFS_DAT_I(struct inode *dat)
{
return (struct nilfs_dat_info *)NILFS_MDT(dat);
}
static int nilfs_dat_prepare_entry(struct inode *dat,
struct nilfs_palloc_req *req, int create)
{
@ -445,16 +455,20 @@ struct inode *nilfs_dat_new(struct the_nilfs *nilfs, size_t entry_size)
{
static struct lock_class_key dat_lock_key;
struct inode *dat;
struct nilfs_dat_info *di;
int err;
dat = nilfs_mdt_new(nilfs, NULL, NILFS_DAT_INO, 0);
dat = nilfs_mdt_new(nilfs, NULL, NILFS_DAT_INO, sizeof(*di));
if (dat) {
err = nilfs_palloc_init_blockgroup(dat, entry_size);
if (unlikely(err)) {
nilfs_mdt_destroy(dat);
return NULL;
}
lockdep_set_class(&NILFS_MDT(dat)->mi_sem, &dat_lock_key);
di = NILFS_DAT_I(dat);
lockdep_set_class(&di->mi.mi_sem, &dat_lock_key);
nilfs_palloc_setup_cache(dat, &di->palloc_cache);
}
return dat;
}