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system/physmem: take into account fd_offset for file fallocate

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Punching a hole in a file with fallocate needs to take into account the
fd_offset value for a correct file location.
But guest_memfd internal use doesn't currently consider fd_offset.

Fixes: 4b870dc4d0 ("hostmem-file: add offset option")

Signed-off-by: William Roche <william.roche@oracle.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20250122194053.3103617-2-william.roche@oracle.com
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
William Roche 2025-01-22 19:40:53 +00:00 • committed by Peter Xu
parent ffaf7f0376
commit f051a9c4dc
1 changed files with 7 additions and 5 deletions
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12
system/physmem.c
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@ -3797,18 +3797,19 @@ int ram_block_discard_range(RAMBlock *rb, uint64_t start, size_t length)
} }
ret = fallocate(rb->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, ret = fallocate(rb->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
start, length); start + rb->fd_offset, length);
if (ret) { if (ret) {
ret = -errno; ret = -errno;
error_report("%s: Failed to fallocate %s:%" PRIx64 " +%zx (%d)", error_report("%s: Failed to fallocate %s:%" PRIx64 "+%" PRIx64
__func__, rb->idstr, start, length, ret); " +%zx (%d)", __func__, rb->idstr, start,
rb->fd_offset, length, ret);
goto err; goto err;
} }
#else #else
ret = -ENOSYS; ret = -ENOSYS;
error_report("%s: fallocate not available/file" error_report("%s: fallocate not available/file"
"%s:%" PRIx64 " +%zx (%d)", "%s:%" PRIx64 "+%" PRIx64 " +%zx (%d)", __func__,
__func__, rb->idstr, start, length, ret); rb->idstr, start, rb->fd_offset, length, ret);
goto err; goto err;
#endif #endif
} }
@ -3855,6 +3856,7 @@ int ram_block_discard_guest_memfd_range(RAMBlock *rb, uint64_t start,
int ret = -1; int ret = -1;
#ifdef CONFIG_FALLOCATE_PUNCH_HOLE #ifdef CONFIG_FALLOCATE_PUNCH_HOLE
/* ignore fd_offset with guest_memfd */
ret = fallocate(rb->guest_memfd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, ret = fallocate(rb->guest_memfd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
start, length); start, length);