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464de56d28
Many readers had little implementations of the logic to decide to retry stale reads with different refs or decide that they're persistent and return hard errors. Let's move that into a small helper. Signed-off-by: Zach Brown <zab@versity.com>
61 lines
2.0 KiB
C
61 lines
2.0 KiB
C
#ifndef _SCOUTFS_BLOCK_H_
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#define _SCOUTFS_BLOCK_H_
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struct scoutfs_block_writer {
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spinlock_t lock;
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struct list_head dirty_list;
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u64 nr_dirty_blocks;
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};
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struct scoutfs_block {
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u64 blkno;
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void *data;
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void *priv;
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};
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struct scoutfs_block_saved_refs {
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struct scoutfs_block_ref refs[2];
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};
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#define DECLARE_SAVED_REFS(name) \
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struct scoutfs_block_saved_refs name = {{{0,}}}
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int scoutfs_block_check_stale(struct super_block *sb, int ret,
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struct scoutfs_block_saved_refs *saved,
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struct scoutfs_block_ref *a, struct scoutfs_block_ref *b);
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int scoutfs_block_read_ref(struct super_block *sb, struct scoutfs_block_ref *ref, u32 magic,
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struct scoutfs_block **bl_ret);
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void scoutfs_block_put(struct super_block *sb, struct scoutfs_block *bl);
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void scoutfs_block_writer_init(struct super_block *sb,
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struct scoutfs_block_writer *wri);
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int scoutfs_block_dirty_ref(struct super_block *sb, struct scoutfs_alloc *alloc,
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struct scoutfs_block_writer *wri, struct scoutfs_block_ref *ref,
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u32 magic, struct scoutfs_block **bl_ret,
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u64 dirty_blkno, u64 *ref_blkno);
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int scoutfs_block_writer_write(struct super_block *sb,
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struct scoutfs_block_writer *wri);
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void scoutfs_block_writer_forget_all(struct super_block *sb,
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struct scoutfs_block_writer *wri);
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void scoutfs_block_writer_forget(struct super_block *sb,
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struct scoutfs_block_writer *wri,
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struct scoutfs_block *bl);
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bool scoutfs_block_writer_has_dirty(struct super_block *sb,
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struct scoutfs_block_writer *wri);
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u64 scoutfs_block_writer_dirty_bytes(struct super_block *sb,
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struct scoutfs_block_writer *wri);
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int scoutfs_block_read_sm(struct super_block *sb,
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struct block_device *bdev, u64 blkno,
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struct scoutfs_block_header *hdr, size_t len,
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__le32 *blk_crc);
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int scoutfs_block_write_sm(struct super_block *sb,
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struct block_device *bdev, u64 blkno,
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struct scoutfs_block_header *hdr, size_t len);
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int scoutfs_block_setup(struct super_block *sb);
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void scoutfs_block_destroy(struct super_block *sb);
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#endif
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