From f6bd4eb73cdf2a5bf954e497972842f39cabb7e3 Mon Sep 17 00:00:00 2001 From: Jonathan Brassow Date: Mon, 22 Jun 2009 10:12:15 +0100 Subject: dm exception store: fix exstore lookup to be case insensitive When snapshots are created using 'p' instead of 'P' as the exception store type, the device-mapper table loading fails. This patch makes the code case insensitive as intended and fixes some regressions reported with device-mapper snapshots. Signed-off-by: Jonathan Brassow Cc: stable@kernel.org Signed-off-by: Alasdair G Kergon --- drivers/md/dm-exception-store.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/md/dm-exception-store.c') diff --git a/drivers/md/dm-exception-store.c b/drivers/md/dm-exception-store.c index 75d8081a9041..c3ae51584b12 100644 --- a/drivers/md/dm-exception-store.c +++ b/drivers/md/dm-exception-store.c @@ -216,7 +216,7 @@ int dm_exception_store_create(struct dm_target *ti, int argc, char **argv, return -EINVAL; } - type = get_type(argv[1]); + type = get_type(&persistent); if (!type) { ti->error = "Exception store type not recognised"; r = -EINVAL; -- cgit v1.2.3 From 874d2f61d31e596c36af7732dc1b3aa2dc233824 Mon Sep 17 00:00:00 2001 From: Milan Broz Date: Tue, 30 Jun 2009 15:18:14 +0100 Subject: dm exception store: really fix type lookup Fix exception store name handling. We need to reference exception store by zero terminated string. Fixes regression introduced in commit f6bd4eb73cdf2a5bf954e497972842f39cabb7e3 Cc: Yi Yang Cc: Jonathan Brassow Cc: stable@kernel.org Cc: Andrew Morton Signed-off-by: Milan Broz Signed-off-by: Alasdair G Kergon --- drivers/md/dm-exception-store.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'drivers/md/dm-exception-store.c') diff --git a/drivers/md/dm-exception-store.c b/drivers/md/dm-exception-store.c index c3ae51584b12..3710ff88fc10 100644 --- a/drivers/md/dm-exception-store.c +++ b/drivers/md/dm-exception-store.c @@ -195,7 +195,7 @@ int dm_exception_store_create(struct dm_target *ti, int argc, char **argv, struct dm_exception_store **store) { int r = 0; - struct dm_exception_store_type *type; + struct dm_exception_store_type *type = NULL; struct dm_exception_store *tmp_store; char persistent; @@ -211,12 +211,15 @@ int dm_exception_store_create(struct dm_target *ti, int argc, char **argv, } persistent = toupper(*argv[1]); - if (persistent != 'P' && persistent != 'N') { + if (persistent == 'P') + type = get_type("P"); + else if (persistent == 'N') + type = get_type("N"); + else { ti->error = "Persistent flag is not P or N"; return -EINVAL; } - type = get_type(&persistent); if (!type) { ti->error = "Exception store type not recognised"; r = -EINVAL; -- cgit v1.2.3 From 2defcc3fb4661e7351cb2ac48d843efc4c64db13 Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Fri, 4 Sep 2009 20:40:41 +0100 Subject: dm exception store: split set_chunk_size Break the function set_chunk_size to two functions in preparation for the fix in the following patch. Cc: stable@kernel.org Signed-off-by: Mikulas Patocka Signed-off-by: Alasdair G Kergon --- drivers/md/dm-exception-store.c | 8 ++++++++ drivers/md/dm-exception-store.h | 4 ++++ 2 files changed, 12 insertions(+) (limited to 'drivers/md/dm-exception-store.c') diff --git a/drivers/md/dm-exception-store.c b/drivers/md/dm-exception-store.c index 3710ff88fc10..4c01c7535fb5 100644 --- a/drivers/md/dm-exception-store.c +++ b/drivers/md/dm-exception-store.c @@ -171,6 +171,14 @@ static int set_chunk_size(struct dm_exception_store *store, */ chunk_size_ulong = round_up(chunk_size_ulong, PAGE_SIZE >> 9); + return dm_exception_store_set_chunk_size(store, chunk_size_ulong, + error); +} + +int dm_exception_store_set_chunk_size(struct dm_exception_store *store, + unsigned long chunk_size_ulong, + char **error) +{ /* Check chunk_size is a power of 2 */ if (!is_power_of_2(chunk_size_ulong)) { *error = "Chunk size is not a power of 2"; diff --git a/drivers/md/dm-exception-store.h b/drivers/md/dm-exception-store.h index 2442c8c07898..812c71872ba0 100644 --- a/drivers/md/dm-exception-store.h +++ b/drivers/md/dm-exception-store.h @@ -168,6 +168,10 @@ static inline chunk_t sector_to_chunk(struct dm_exception_store *store, int dm_exception_store_type_register(struct dm_exception_store_type *type); int dm_exception_store_type_unregister(struct dm_exception_store_type *type); +int dm_exception_store_set_chunk_size(struct dm_exception_store *store, + unsigned long chunk_size_ulong, + char **error); + int dm_exception_store_create(struct dm_target *ti, int argc, char **argv, unsigned *args_used, struct dm_exception_store **store); -- cgit v1.2.3 From ae0b7448e91353ea5f821601a055aca6b58042cd Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Fri, 4 Sep 2009 20:40:43 +0100 Subject: dm snapshot: fix on disk chunk size validation Fix some problems seen in the chunk size processing when activating a pre-existing snapshot. For a new snapshot, the chunk size can either be supplied by the creator or a default value can be used. For an existing snapshot, the chunk size in the snapshot header on disk should always be used. If someone attempts to load an existing snapshot and has the 'default chunk size' option set, the kernel uses its default value even when it is incorrect for the snapshot being loaded. This patch ensures the correct on-disk value is always used. Secondly, when the code does use the chunk size stored on the disk it is prudent to revalidate it, so the code can exit cleanly if it got corrupted as happened in https://bugzilla.redhat.com/show_bug.cgi?id=461506 . Cc: stable@kernel.org Signed-off-by: Mikulas Patocka Signed-off-by: Alasdair G Kergon --- drivers/md/dm-exception-store.c | 5 +++++ drivers/md/dm-snap-persistent.c | 22 ++++++++++++++-------- 2 files changed, 19 insertions(+), 8 deletions(-) (limited to 'drivers/md/dm-exception-store.c') diff --git a/drivers/md/dm-exception-store.c b/drivers/md/dm-exception-store.c index 4c01c7535fb5..556acff3952f 100644 --- a/drivers/md/dm-exception-store.c +++ b/drivers/md/dm-exception-store.c @@ -191,6 +191,11 @@ int dm_exception_store_set_chunk_size(struct dm_exception_store *store, return -EINVAL; } + if (chunk_size_ulong > INT_MAX >> SECTOR_SHIFT) { + *error = "Chunk size is too high"; + return -EINVAL; + } + store->chunk_size = chunk_size_ulong; store->chunk_mask = chunk_size_ulong - 1; store->chunk_shift = ffs(chunk_size_ulong) - 1; diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c index 5d1a97580cb7..d5b2e08750d5 100644 --- a/drivers/md/dm-snap-persistent.c +++ b/drivers/md/dm-snap-persistent.c @@ -286,6 +286,7 @@ static int read_header(struct pstore *ps, int *new_snapshot) struct disk_header *dh; chunk_t chunk_size; int chunk_size_supplied = 1; + char *chunk_err; /* * Use default chunk size (or hardsect_size, if larger) if none supplied @@ -329,20 +330,25 @@ static int read_header(struct pstore *ps, int *new_snapshot) ps->version = le32_to_cpu(dh->version); chunk_size = le32_to_cpu(dh->chunk_size); - if (!chunk_size_supplied || ps->store->chunk_size == chunk_size) + if (ps->store->chunk_size == chunk_size) return 0; - DMWARN("chunk size %llu in device metadata overrides " - "table chunk size of %llu.", - (unsigned long long)chunk_size, - (unsigned long long)ps->store->chunk_size); + if (chunk_size_supplied) + DMWARN("chunk size %llu in device metadata overrides " + "table chunk size of %llu.", + (unsigned long long)chunk_size, + (unsigned long long)ps->store->chunk_size); /* We had a bogus chunk_size. Fix stuff up. */ free_area(ps); - ps->store->chunk_size = chunk_size; - ps->store->chunk_mask = chunk_size - 1; - ps->store->chunk_shift = ffs(chunk_size) - 1; + r = dm_exception_store_set_chunk_size(ps->store, chunk_size, + &chunk_err); + if (r) { + DMERR("invalid on-disk chunk size %llu: %s.", + (unsigned long long)chunk_size, chunk_err); + return r; + } r = dm_io_client_resize(sectors_to_pages(ps->store->chunk_size), ps->io_client); -- cgit v1.2.3