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Add scoutfs_block_forget()

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Add scoutfs_block_forget() which ensures that a block won't satisfy
future lookups and will not be written out.

Signed-off-by: Zach Brown <zab@versity.com>
Reviewed-by: Mark Fasheh <mfasheh@versity.com>
This commit is contained in:
Zach Brown
2016-11-07 17:47:12 -08:00
parent f57c07381a
commit d4571b6db3
2 changed files with 25 additions and 0 deletions
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24
kmod/src/block.c
View File

@@ -577,6 +577,30 @@ struct scoutfs_block *scoutfs_block_dirty_alloc(struct super_block *sb)
return bl;
}
/*
* Forget the given block by removing it from the radix and clearing its
* dirty tag. It will not be found by future lookups and will not be
* written out. The caller can still use it until it drops its
* reference.
*/
void scoutfs_block_forget(struct scoutfs_block *bl)
{
struct scoutfs_sb_info *sbi = SCOUTFS_SB(bl->sb);
struct scoutfs_block *found;
unsigned long flags;
u64 blkno = bl->blkno;
spin_lock_irqsave(&sbi->block_lock, flags);
found = radix_tree_lookup(&sbi->block_radix, blkno);
if (found == bl) {
radix_tree_delete(&sbi->block_radix, blkno);
radix_tree_tag_clear(&sbi->block_radix, blkno, DIRTY_RADIX_TAG);
scoutfs_block_put(found);
}
spin_unlock_irqrestore(&sbi->block_lock, flags);
}
void scoutfs_block_set_crc(struct scoutfs_block *bl)
{
struct scoutfs_block_header *hdr = scoutfs_block_data(bl);

1
kmod/src/block.h
View File

@@ -29,6 +29,7 @@ void scoutfs_block_unlock(struct scoutfs_block *bl, bool write);
void *scoutfs_block_data(struct scoutfs_block *bl);
void *scoutfs_block_data_from_contents(const void *ptr);
void scoutfs_block_forget(struct scoutfs_block *bl);
void scoutfs_block_put(struct scoutfs_block *bl);
void scoutfs_block_destroy(struct super_block *sb);