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format_text: Split vgname_from_mda into three pieces.
This commit is contained in:
Alasdair G Kergon
parent
d61b1369d0
commit
c70c9f6565
@ -1328,16 +1328,118 @@ static int _scan_file(const struct format_type *fmt, const char *vgname)
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return 1;
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}
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struct vgname_from_mda_params{
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const struct format_type *fmt;
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struct mda_header *mdah;
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struct device_area *dev_area;
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int primary_mda;
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struct lvmcache_vgsummary *vgsummary;
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uint64_t *mda_free_sectors;
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uint32_t wrap;
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unsigned used_cached_metadata;
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};
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static int _vgname_from_mda_process(struct vgname_from_mda_params *vfmp)
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{
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struct mda_header *mdah = vfmp->mdah;
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struct device_area *dev_area = vfmp->dev_area;
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struct lvmcache_vgsummary *vgsummary = vfmp->vgsummary;
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uint64_t *mda_free_sectors = vfmp->mda_free_sectors;
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struct raw_locn *rlocn = mdah->raw_locns;
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uint64_t buffer_size, current_usage;
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int r = 0;
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/* Ignore this entry if the characters aren't permissible */
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if (!validate_name(vgsummary->vgname))
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goto_out;
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log_debug_metadata("%s: %s metadata at " FMTu64 " size " FMTu64 " with wrap " FMTu32
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" (in area at " FMTu64 " size " FMTu64
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") for %s (" FMTVGID ")",
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dev_name(dev_area->dev),
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vfmp->used_cached_metadata ? "Using cached" : "Found",
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dev_area->start + rlocn->offset,
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rlocn->size, vfmp->wrap, dev_area->start, dev_area->size, vgsummary->vgname,
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(char *)&vgsummary->vgid);
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if (mda_free_sectors) {
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current_usage = ALIGN_ABSOLUTE(rlocn->size, dev_area->start + rlocn->offset, MDA_ALIGNMENT);
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buffer_size = mdah->size - MDA_HEADER_SIZE;
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if (current_usage * 2 >= buffer_size)
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*mda_free_sectors = UINT64_C(0);
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else
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*mda_free_sectors = ((buffer_size - 2 * current_usage) / 2) >> SECTOR_SHIFT;
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}
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r = 1;
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out:
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return r;
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}
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static int _vgname_from_mda_validate(struct vgname_from_mda_params *vfmp, char *buffer)
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{
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const struct format_type *fmt = vfmp->fmt;
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struct mda_header *mdah = vfmp->mdah;
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struct device_area *dev_area = vfmp->dev_area;
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struct lvmcache_vgsummary *vgsummary = vfmp->vgsummary;
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struct raw_locn *rlocn = mdah->raw_locns;
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unsigned len = 0;
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char buf[NAME_LEN + 1] __attribute__((aligned(8)));
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memcpy(buf, buffer, NAME_LEN + 1);
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while (buf[len] && !isspace(buf[len]) && buf[len] != '{' &&
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len < (NAME_LEN - 1))
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len++;
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buf[len] = '\0';
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/* Ignore this entry if the characters aren't permissible */
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if (!validate_name(buf))
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goto_out;
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/* We found a VG - now check the metadata */
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if (rlocn->offset + rlocn->size > mdah->size)
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vfmp->wrap = (uint32_t) ((rlocn->offset + rlocn->size) - mdah->size);
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if (vfmp->wrap > rlocn->offset) {
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log_error("%s: metadata (" FMTu64 " bytes) too large for circular buffer (" FMTu64 " bytes)",
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dev_name(dev_area->dev), rlocn->size, mdah->size - MDA_HEADER_SIZE);
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goto out;
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}
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/* Did we see this metadata before? */
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vgsummary->mda_checksum = rlocn->checksum;
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vgsummary->mda_size = rlocn->size;
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if (lvmcache_lookup_mda(vgsummary))
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vfmp->used_cached_metadata = 1;
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/* FIXME 64-bit */
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if (!text_vgsummary_import(fmt, dev_area->dev, MDA_CONTENT_REASON(vfmp->primary_mda),
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(off_t) (dev_area->start + rlocn->offset),
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(uint32_t) (rlocn->size - vfmp->wrap),
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(off_t) (dev_area->start + MDA_HEADER_SIZE),
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vfmp->wrap, calc_crc, vgsummary->vgname ? 1 : 0,
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vgsummary))
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goto_out;
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return _vgname_from_mda_process(vfmp);
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out:
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return 0;
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}
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int vgname_from_mda(const struct format_type *fmt,
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struct mda_header *mdah, int primary_mda, struct device_area *dev_area,
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struct lvmcache_vgsummary *vgsummary, uint64_t *mda_free_sectors)
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{
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struct raw_locn *rlocn;
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uint32_t wrap = 0;
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unsigned int len = 0;
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char buf[NAME_LEN + 1] __attribute__((aligned(8)));
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uint64_t buffer_size, current_usage;
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unsigned used_cached_metadata = 0;
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struct vgname_from_mda_params *vfmp;
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if (mda_free_sectors)
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*mda_free_sectors = ((dev_area->size - MDA_HEADER_SIZE) / 2) >> SECTOR_SHIFT;
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@ -1359,72 +1461,25 @@ int vgname_from_mda(const struct format_type *fmt,
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return 0;
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}
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if (!(vfmp = dm_pool_zalloc(fmt->cmd->mem, sizeof(*vfmp)))) {
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log_error("vgname_from_mda_params allocation failed");
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return 0;
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}
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vfmp->fmt = fmt;
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vfmp->mdah = mdah;
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vfmp->dev_area = dev_area;
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vfmp->vgsummary = vgsummary;
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vfmp->primary_mda = primary_mda;
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vfmp->mda_free_sectors = mda_free_sectors;
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/* Do quick check for a vgname */
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/* We cannot read the full metadata here because the name has to be validated before we use the size field */
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if (!dev_read_buf(dev_area->dev, dev_area->start + rlocn->offset,
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NAME_LEN, MDA_CONTENT_REASON(primary_mda), buf))
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return_0;
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while (buf[len] && !isspace(buf[len]) && buf[len] != '{' &&
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len < (NAME_LEN - 1))
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len++;
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buf[len] = '\0';
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/* Ignore this entry if the characters aren't permissible */
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if (!validate_name(buf))
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return_0;
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/* We found a VG - now check the metadata */
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if (rlocn->offset + rlocn->size > mdah->size)
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wrap = (uint32_t) ((rlocn->offset + rlocn->size) - mdah->size);
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if (wrap > rlocn->offset) {
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log_error("%s: metadata (" FMTu64 " bytes) too large for circular buffer (" FMTu64 " bytes)",
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dev_name(dev_area->dev), rlocn->size, mdah->size - MDA_HEADER_SIZE);
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return 0;
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}
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/* Did we see this metadata before? */
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vgsummary->mda_checksum = rlocn->checksum;
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vgsummary->mda_size = rlocn->size;
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if (lvmcache_lookup_mda(vgsummary))
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used_cached_metadata = 1;
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/* FIXME 64-bit */
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if (!text_vgsummary_import(fmt, dev_area->dev, MDA_CONTENT_REASON(primary_mda),
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(off_t) (dev_area->start + rlocn->offset),
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(uint32_t) (rlocn->size - wrap),
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(off_t) (dev_area->start + MDA_HEADER_SIZE),
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wrap, calc_crc, vgsummary->vgname ? 1 : 0,
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vgsummary))
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return_0;
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/* Ignore this entry if the characters aren't permissible */
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if (!validate_name(vgsummary->vgname))
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return_0;
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log_debug_metadata("%s: %s metadata at " FMTu64 " size " FMTu64 " with wrap " FMTu32
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" (in area at " FMTu64 " size " FMTu64
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") for %s (" FMTVGID ")",
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dev_name(dev_area->dev),
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used_cached_metadata ? "Using cached" : "Found",
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dev_area->start + rlocn->offset,
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rlocn->size, wrap, dev_area->start, dev_area->size, vgsummary->vgname,
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(char *)&vgsummary->vgid);
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if (mda_free_sectors) {
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current_usage = ALIGN_ABSOLUTE(rlocn->size, dev_area->start + rlocn->offset, MDA_ALIGNMENT);
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buffer_size = mdah->size - MDA_HEADER_SIZE;
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if (current_usage * 2 >= buffer_size)
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*mda_free_sectors = UINT64_C(0);
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else
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*mda_free_sectors = ((buffer_size - 2 * current_usage) / 2) >> SECTOR_SHIFT;
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}
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return 1;
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return _vgname_from_mda_validate(vfmp, buf);
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}
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static int _scan_raw(const struct format_type *fmt, const char *vgname __attribute__((unused)))
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