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Additional block cloning fixes.

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Reimplement some of the block cloning vs dbuf logic, mostly to fix
situation where we clone a block and in the same transaction group
we want to partially overwrite the clone.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Pawel Jakub Dawidek <pawel@dawidek.net>
Closes #14825
This commit is contained in:
Pawel Jakub Dawidek
2023-04-30 02:47:09 -07:00
committed by Brian Behlendorf
parent 469019fb0b
commit 555ef90c5c
3 changed files with 95 additions and 45 deletions
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include/sys/dbuf.h
+13 -10
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@@ -61,16 +61,18 @@ extern "C" {
/*
* The simplified state transition diagram for dbufs looks like:
*
* +----> READ ----+
* | |
* | V
* (alloc)-->UNCACHED CACHED-->EVICTING-->(free)
* | ^ ^
* | | |
* +----> FILL ----+ |
* | |
* | |
* +--------> NOFILL -------+
* +--> READ --+
* | |
* | V
* (alloc)-->UNCACHED CACHED-->EVICTING-->(free)
* ^ | ^ ^
* | | | |
* | +--> FILL --+ |
* | | |
* | | |
* | +------> NOFILL -----+
* | |
* +---------------+
*
* DB_SEARCH is an invalid state for a dbuf. It is used by dbuf_free_range
* to find all dbufs in a range of a dnode and must be less than any other
@@ -375,6 +377,7 @@ dmu_buf_impl_t *dbuf_find(struct objset *os, uint64_t object, uint8_t level,
uint64_t blkid, uint64_t *hash_out);
int dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags);
void dmu_buf_will_clone(dmu_buf_t *db, dmu_tx_t *tx);
void dmu_buf_will_not_fill(dmu_buf_t *db, dmu_tx_t *tx);
void dmu_buf_will_fill(dmu_buf_t *db, dmu_tx_t *tx);
void dmu_buf_fill_done(dmu_buf_t *db, dmu_tx_t *tx);