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Fix zfs_get_data access to files with wrong generation

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If TX_WRITE is create on a file, and the file is later deleted and a new
directory is created on the same object id, it is possible that when
zil_commit happens, zfs_get_data will be called on the new directory.
This may result in panic as it tries to do range lock.

This patch fixes this issue by record the generation number during
zfs_log_write, so zfs_get_data can check if the object is valid.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Chunwei Chen <david.chen@nutanix.com>
Closes #10593
Closes #11682
This commit is contained in:
Chunwei Chen
2021-03-19 22:53:31 -07:00
committed by GitHub
parent 66e6d3f128
commit 296a4a369b
7 changed files with 28 additions and 8 deletions
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include/sys/zvol_impl.h
+2 -2
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@@ -85,8 +85,8 @@ void zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off,
uint64_t len, boolean_t sync);
void zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, uint64_t offset,
uint64_t size, int sync);
int zvol_get_data(void *arg, lr_write_t *lr, char *buf, struct lwb *lwb,
zio_t *zio);
int zvol_get_data(void *arg, uint64_t arg2, lr_write_t *lr, char *buf,
struct lwb *lwb, zio_t *zio);
int zvol_init_impl(void);
void zvol_fini_impl(void);
void zvol_wait_close(zvol_state_t *zv);