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Fix regression in dmu_buf_will_fill()

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Direct I/O implementation added condition to call dbuf_undirty()
only in case of block cloning.  But the condition is not right if
the block is no longer dirty in this TXG, but still in DB_NOFILL
state.  It resulted in block not reverting to DB_UNCACHED and
following NULL de-reference on attempt to access absent db_data.

While there, add assertions for db_data to make debugging easier.

Reviewed-by: Brian Atkinson <batkinson@lanl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #16829
This commit is contained in:
Alexander Motin
2024-12-02 20:08:40 -05:00
committed by Brian Behlendorf
parent 17cdb7a2b1
commit b17ea73f9d
3 changed files with 11 additions and 2 deletions
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module/os/freebsd/zfs/dmu_os.c
+6 -1
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@@ -103,6 +103,7 @@ dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
db->db_offset + bufoff);
thiscpy = MIN(PAGESIZE, tocpy - copied);
va = zfs_map_page(*ma, &sf);
ASSERT(db->db_data != NULL);
memcpy((char *)db->db_data + bufoff, va, thiscpy);
zfs_unmap_page(sf);
ma += 1;
@@ -172,6 +173,7 @@ dmu_read_pages(objset_t *os, uint64_t object, vm_page_t *ma, int count,
ASSERT3U(db->db_size, >, PAGE_SIZE);
bufoff = IDX_TO_OFF(m->pindex) % db->db_size;
va = zfs_map_page(m, &sf);
ASSERT(db->db_data != NULL);
memcpy(va, (char *)db->db_data + bufoff, PAGESIZE);
zfs_unmap_page(sf);
vm_page_valid(m);
@@ -211,8 +213,10 @@ dmu_read_pages(objset_t *os, uint64_t object, vm_page_t *ma, int count,
*/
tocpy = MIN(db->db_size - bufoff, PAGESIZE - pgoff);
ASSERT3S(tocpy, >=, 0);
if (m != bogus_page)
if (m != bogus_page) {
ASSERT(db->db_data != NULL);
memcpy(va + pgoff, (char *)db->db_data + bufoff, tocpy);
}
pgoff += tocpy;
ASSERT3S(pgoff, >=, 0);
@@ -290,6 +294,7 @@ dmu_read_pages(objset_t *os, uint64_t object, vm_page_t *ma, int count,
bufoff = IDX_TO_OFF(m->pindex) % db->db_size;
tocpy = MIN(db->db_size - bufoff, PAGESIZE);
va = zfs_map_page(m, &sf);
ASSERT(db->db_data != NULL);
memcpy(va, (char *)db->db_data + bufoff, tocpy);
if (tocpy < PAGESIZE) {
ASSERT3S(i, ==, *rahead - 1);