search for: region_file

...nst struct regions *regions, +extern const struct region *find_region (const regions *regions, uint64_t offset) __attribute__((__nonnull__ (1))); @@ -119,7 +118,7 @@ extern const struct region *find_region (const struct regions *regions, * If type == region_file, it must be followed by u.i parameter. * If type == region_data, it must be followed by u.data parameter. */ -extern int append_region_len (struct regions *regions, +extern int append_region_len (regions *regions, const char *description, uint64_t len,...

...for GPT */ +}; + +static struct file *files = NULL; +static size_t nr_files = 0; + +/* partition-type parameter. */ +#define PARTTYPE_UNSET 0 +#define PARTTYPE_MBR 1 +#define PARTTYPE_GPT 2 +static int parttype = PARTTYPE_UNSET; + +/* Virtual disk regions (contiguous). */ +enum region_type { + region_file, /* contents of the i'th file */ + region_data, /* pointer to data (used for partition table) */ + region_zero, /* padding */ +}; + +struct region { + uint64_t start, len, end; /* byte offsets; end = start + len - 1 */ + enum region_type type; + union { + size_t...

nbdkit partitioning boot.img swap.img root.img ... creates a virtual disk by adding a partition table. In ancient times Xen used to do this. Rich.

The partitioning plugin patch is the same (except for rebasing). However I have changed the first two patches based on feedback received. In particular this fixes a very serious bug found by Eric Blake in the current truncate filter. Rich.

...; + +/* Create the MBR and optionally EBRs. */ void -create_mbr_partition_table (unsigned char *out) +create_mbr_layout (void) { - size_t i, j; - - for (j = 0; j < nr_regions (&regions); ++j) { - const struct region *region = get_region (&regions, j); - - if (region->type == region_file) { - i = region->u.i; - assert (i < 4); - create_mbr_partition_table_entry (region, i == 0, - files[i].mbr_id, - &out[0x1be + 16*i]); - } - } + size_t i, j = 0; /* Boot signature. */ -...

This was a rather longer trip around the houses than I anticipated! The basic purpose of the patch series is to set $nbdkit_stdio_safe to "0" or "1" in sh and eval plugin scripts. To do that, I ended up adding a nicer way to manipulate environ lists, and to do that, I ended up adding a whole generic vector implementation which is applicable in a lot of different places.

An evolution of the patch I posted yesterday to qemu-devel (https://www.mail-archive.com/qemu-devel@nongnu.org/msg588920.html) which (a) works and (b) has a test. Rich.

...while (count > 0) { + const struct region *region = find_region (&disk.regions, offset); + size_t len; + ssize_t r; + + /* Length to end of region. */ + len = region->end - offset + 1; + if (len > count) + len = count; + + switch (region->type) { + case region_file: + /* We don't use region->u.i since there is only one backing + * file, and we have that open already (in ‘disk.fd’). + */ + r = pread (disk.fd, buf, len, offset - region->start); + if (r == -1) { + nbdkit_error ("pread: %m"); + return -...

...while (count > 0) { + const struct region *region = find_region (&disk.regions, offset); + size_t len; + ssize_t r; + + /* Length to end of region. */ + len = region->end - offset + 1; + if (len > count) + len = count; + + switch (region->type) { + case region_file: + /* We don't use region->u.i since there is only one backing + * file, and we have that open already (in ‘disk.fd’). + */ + r = pread (disk.fd, buf, len, offset - region->start); + if (r == -1) { + nbdkit_error ("pread: %m"); + return -...

Add nbdkit-floppy-plugin, “inspired” by qemu's VVFAT driver, but without the ability to handle writes. The implementation is pretty complete, supporting FAT32, LFNs, volume labels, timestamps, etc, and it passes both ‘make check’ and ‘make check-valgrind’. Usage is simple; to serve the current directory: $ nbdkit floppy . Then using guestfish (or any NBD client): $ guestfish --ro

For v3 I reimplemented this using mke2fs -d. This obviously makes the implementation a whole lot simpler, but cannot support multiple directory merging. Patches 1-3 are the same as before. I've also reproduced the notes from v2 below. v2: - Fix inconsistent tab/space. - All 3 plugins now contain a block of text pointing to the other 2 plugins. - TMDIR -> TMPDIR - Unlink the

This is a revised version of the two series previously posted here: https://www.redhat.com/archives/libguestfs/2019-January/msg00137.html https://www.redhat.com/archives/libguestfs/2019-January/msg00139.html There have been many smaller changes but the highlights are: - Using SECTOR_SIZE instead of hard-coding 512 everywhere. - Additional safety checks that the EBR chain doesn't jump

Another interesting thing you can do with this plugin: https://rwmj.wordpress.com/2019/02/19/nbdkit-linuxdisk-plugin/ v2: - Fix inconsistent tab/space. - All 3 plugins now contain a block of text pointing to the other 2 plugins. - TMDIR -> TMPDIR - Unlink the temporary file and other cleanups along error paths. - fclose -> pclose, and check the return value for errors. -

Turns out Japanese trains are good for coding! In supermin we have a bunch of code to create the libguestfs appliance. It creates it directly using libext2fs (part of e2fsprogs). We can use the same technique to create ext2 virtual disks in nbdkit, which is what this new plugin does. Why a new plugin instead of modifying the floppy plugin? See the 4/4 commit message for an explanation. The

...on *region = find_region (&floppy.regions, offset); + size_t i, len; + const char *host_path; + int fd; + ssize_t r; + + /* Length to end of region. */ + len = region->end - offset + 1; + if (len > count) + len = count; + + switch (region->type) { + case region_file: + i = region->u.i; + assert (i < floppy.nr_files); + host_path = floppy.files[i].host_path; + fd = open (host_path, O_RDONLY|O_CLOEXEC); + if (fd == -1) { + nbdkit_error ("open: %s: %m", host_path); + return -1; + } + r = pread (fd,...