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| author | Hans Holmberg <hans.holmberg@cnexlabs.com> | 2018-03-30 00:04:51 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-03-29 17:29:09 -0600 |
| commit | d0ab0b1ab991f48fc1fb579490df397d5f819913 (patch) | |
| tree | 26ccf194c81a0bd1598efa5401cc3126517a5423 /drivers/lightnvm/pblk-core.c | |
| parent | cfe1c9e2e2a34ccaf2ba01d2c435d65207335ca1 (diff) | |
| download | linux-d0ab0b1ab991f48fc1fb579490df397d5f819913.tar.bz2 | |
lightnvm: pblk: check data lines version on recovery
As a preparation for future bumps of data line persistent storage
versions, we need to start checking the emeta line version during
recovery. Also slit up the current emeta/smeta version into two
bytes (major,minor).
Recovering lines with the same major number as the current pblk data
line version must succeed. This means that any changes in the
persistent format must be:
(1) Backward compatible: if we switch back to and older
kernel, recovery of lines stored with major == current_major
and minor > current_minor must succeed.
(2) Forward compatible: switching to a newer kernel,
recovery of lines stored with major=current_major and
minor < minor must handle the data format differences
gracefully(i.e. initialize new data structures to default values).
If we detect lines that have a different major number than
the current we must abort recovery. The user must manually
migrate the data in this case.
Previously the version stored in the emeta header was copied
from smeta, which has version 1, so we need to set the minor
version to 1.
Signed-off-by: Hans Holmberg <hans.holmberg@cnexlabs.com>
Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/lightnvm/pblk-core.c')
| -rw-r--r-- | drivers/lightnvm/pblk-core.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c index 9027cf2ed1d8..155e42a26293 100644 --- a/drivers/lightnvm/pblk-core.c +++ b/drivers/lightnvm/pblk-core.c @@ -975,7 +975,8 @@ static int pblk_line_init_metadata(struct pblk *pblk, struct pblk_line *line, memcpy(smeta_buf->header.uuid, pblk->instance_uuid, 16); smeta_buf->header.id = cpu_to_le32(line->id); smeta_buf->header.type = cpu_to_le16(line->type); - smeta_buf->header.version = SMETA_VERSION; + smeta_buf->header.version_major = SMETA_VERSION_MAJOR; + smeta_buf->header.version_minor = SMETA_VERSION_MINOR; /* Start metadata */ smeta_buf->seq_nr = cpu_to_le64(line->seq_nr); @@ -998,6 +999,12 @@ static int pblk_line_init_metadata(struct pblk *pblk, struct pblk_line *line, /* End metadata */ memcpy(&emeta_buf->header, &smeta_buf->header, sizeof(struct line_header)); + + emeta_buf->header.version_major = EMETA_VERSION_MAJOR; + emeta_buf->header.version_minor = EMETA_VERSION_MINOR; + emeta_buf->header.crc = cpu_to_le32( + pblk_calc_meta_header_crc(pblk, &emeta_buf->header)); + emeta_buf->seq_nr = cpu_to_le64(line->seq_nr); emeta_buf->nr_lbas = cpu_to_le64(line->sec_in_line); emeta_buf->nr_valid_lbas = cpu_to_le64(0); |