search for: new_bm

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2018 Jan 26
2
[PATCH nbdkit] filters: cache, cow: Handle bitmap overflow on 32 bit architectures.
...cache.c +++ b/filters/cache/cache.c @@ -72,7 +72,7 @@ static int fd = -1; static uint8_t *bitmap; /* Size of the bitmap in bytes. */ -static uint64_t bm_size; +static size_t bm_size; enum bm_entry { BLOCK_NOT_CACHED = 0, @@ -167,7 +167,14 @@ blk_set_size (uint64_t new_size) { uint8_t *new_bm; const size_t old_bm_size = bm_size; - size_t new_bm_size = DIV_ROUND_UP (new_size, BLKSIZE*8/2); + uint64_t new_bm_size_u64 = DIV_ROUND_UP (new_size, BLKSIZE*8/2); + size_t new_bm_size; + + if (new_bm_size_u64 > SIZE_MAX) { + nbdkit_error ("bitmap too large for this architecture&...
2018 Dec 01
0
[PATCH nbdkit] common: Move shared bitmap code to a common library.
...+#include <string.h> +#include <stdint.h> + +#include <nbdkit-plugin.h> + +#include "bitmap.h" +#include "rounding.h" + +int +bitmap_resize (struct bitmap *bm, uint64_t new_size) +{ + uint8_t *new_bitmap; + const size_t old_bm_size = bm->size; + uint64_t new_bm_size_u64; + size_t new_bm_size; + + new_bm_size_u64 = DIV_ROUND_UP (new_size, bm->blksize * 8 / bm->bpb); + if (new_bm_size_u64 > SIZE_MAX) { + nbdkit_error ("bitmap too large for this architecture"); + return -1; + } + new_bm_size = (size_t) new_bm_size_u64; + + new_...
2018 Dec 02
0
[PATCH nbdkit v2] common: Move shared bitmap code to a common library.
...+#include <string.h> +#include <stdint.h> + +#include <nbdkit-plugin.h> + +#include "bitmap.h" +#include "rounding.h" + +int +bitmap_resize (struct bitmap *bm, uint64_t new_size) +{ + uint8_t *new_bitmap; + const size_t old_bm_size = bm->size; + uint64_t new_bm_size_u64; + size_t new_bm_size; + + new_bm_size_u64 = DIV_ROUND_UP (new_size, bm->blksize * 8 / bm->bpb); + if (new_bm_size_u64 > SIZE_MAX) { + nbdkit_error ("bitmap too large for this architecture"); + return -1; + } + new_bm_size = (size_t) new_bm_size_u64; + + new_...
2018 Dec 03
0
[PATCH nbdkit v3] common: Move shared bitmap code to a common library.
...+#include <string.h> +#include <stdint.h> + +#include <nbdkit-plugin.h> + +#include "bitmap.h" +#include "rounding.h" + +int +bitmap_resize (struct bitmap *bm, uint64_t new_size) +{ + uint8_t *new_bitmap; + const size_t old_bm_size = bm->size; + uint64_t new_bm_size_u64; + size_t new_bm_size; + + new_bm_size_u64 = DIV_ROUND_UP (new_size, + bm->blksize * UINT64_C(8) / bm->bpb); + if (new_bm_size_u64 > SIZE_MAX) { + nbdkit_error ("bitmap too large for this architecture"); + return -1; + } + new_...
2018 Dec 01
2
[PATCH nbdkit] common: Move shared bitmap code to a common library.
I have some patches I'm working on to fix the cache filter. However this is a prelude. It should be simply pure refactoring. All tests pass still. Rich.
2018 Dec 03
3
[PATCH nbdkit v3] common: Move shared bitmap code to a common library.
v2: https://www.redhat.com/archives/libguestfs/2018-December/msg00039.html v2 -> v3: - Fix all the issues raised in Eric's review. - Precompute some numbers to make the calculations easier. - Calculations now use bitshifts and masks in preference to division and modulo. - Clear existing bits before setting (which fixes a bug in the cache filter). Rich.
2018 Dec 02
2
[PATCH nbdkit v2] common: Move shared bitmap code to a common library.
This is exactly the same as v1: https://www.redhat.com/archives/libguestfs/2018-December/msg00004.html except that it now frees the bitmap on unload (which the old code did not - there was always a memory leak). Rich.
2018 Jan 21
2
Re: [PATCH nbdkit] filters: Add copy-on-write filter.
...("cow: filesystem block size: %d", blksize); } static void @@ -147,6 +147,34 @@ cow_open (nbdkit_next_open *next, void *nxdata, int readonly) return &handle; } +/* Allocate or resize the overlay file and bitmap. */ +static int +blk_set_size (uint64_t new_size) +{ + uint8_t *new_bm; + const size_t old_bm_size = bm_size; + size_t new_bm_size = DIV_ROUND_UP (new_size, BLKSIZE*8); + + new_bm = realloc (bitmap, new_bm_size); + if (new_bm == NULL) { + nbdkit_error ("realloc: %m"); + return -1; + } + bitmap = new_bm; + bm_size = new_bm_size; + if (old_bm_siz...
2018 Jan 22
1
[PATCH nbdkit] filters: Add caching filter.
This adds a cache filter, which works like the COW filter in reverse. For realistic use it needs a bit more work, especially to add limits on the size of the cache, a more sensible cache replacement policy, and perhaps some kind of background worker to write dirty blocks out. Rich.
2018 Jan 20
4
[PATCH nbdkit] filters: Add copy-on-write filter.
Eric, you'll probably find the design "interesting" ... It does work, for me at least. Rich.