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authorBoaz Harrosh <bharrosh@panasas.com>2011-10-12 18:42:22 +0200
committerBoaz Harrosh <bharrosh@panasas.com>2011-10-24 16:55:36 -0700
commita1fec1dbbc8db974d2582e4040590cebe72171e4 (patch)
tree9dcbe1933b7f40256f40393f3c86dbb16e8fb953 /include/scsi/osd_ore.h
parent3e335672e018c06e007f85a5d54afd721fb3d6d5 (diff)
ore: RAID5 read
This patch introduces the first stage of RAID5 support mainly the skip-over-raid-units when reading. For writes it inserts BLANK units, into where XOR blocks should be calculated and written to. It introduces the new "general raid maths", and the main additional parameters and components needed for raid5. Since at this stage it could corrupt future version that actually do support raid5. The enablement of raid5 mounting and setting of parity-count > 0 is disabled. So the raid5 code will never be used. Mounting of raid5 is only enabled later once the basic XOR write is also in. But if the patch "enable RAID5" is applied this code has been tested to be able to properly read raid5 volumes and is according to standard. Also it has been tested that the new maths still properly supports RAID0 and grouping code just as before. (BTW: I have found more bugs in the pnfs-obj RAID math fixed here) The ore.c file is getting too big, so new ore_raid.[hc] files are added that will include the special raid stuff that are not used in striping and mirrors. In future write support these will get bigger. When adding the ore_raid.c to Kbuild file I was forced to rename ore.ko to libore.ko. Is it possible to keep source file, say ore.c and module file ore.ko the same even if there are multiple files inside ore.ko? Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Diffstat (limited to 'include/scsi/osd_ore.h')
-rw-r--r--include/scsi/osd_ore.h21
1 files changed, 18 insertions, 3 deletions
diff --git a/include/scsi/osd_ore.h b/include/scsi/osd_ore.h
index a8e39d14f82b..43821c18cd3f 100644
--- a/include/scsi/osd_ore.h
+++ b/include/scsi/osd_ore.h
@@ -40,6 +40,7 @@ struct ore_layout {
unsigned mirrors_p1;
unsigned group_width;
+ unsigned parity;
u64 group_depth;
unsigned group_count;
@@ -89,11 +90,16 @@ static inline void ore_comp_set_dev(
}
struct ore_striping_info {
+ u64 offset;
u64 obj_offset;
- u64 group_length;
+ u64 length;
+ u64 first_stripe_start; /* only used in raid writes */
u64 M; /* for truncate */
+ unsigned bytes_in_stripe;
unsigned dev;
+ unsigned par_dev;
unsigned unit_off;
+ unsigned cur_comp;
};
struct ore_io_state;
@@ -127,6 +133,13 @@ struct ore_io_state {
bool reading;
+ /* House keeping of Parity pages */
+ bool extra_part_alloc;
+ struct page **parity_pages;
+ unsigned max_par_pages;
+ unsigned cur_par_page;
+ unsigned sgs_per_dev;
+
/* Variable array of size numdevs */
unsigned numdevs;
struct ore_per_dev_state {
@@ -134,7 +147,10 @@ struct ore_io_state {
struct bio *bio;
loff_t offset;
unsigned length;
+ unsigned last_sgs_total;
unsigned dev;
+ struct osd_sg_entry *sglist;
+ unsigned cur_sg;
} per_dev[];
};
@@ -147,8 +163,7 @@ static inline unsigned ore_io_state_size(unsigned numdevs)
/* ore.c */
int ore_verify_layout(unsigned total_comps, struct ore_layout *layout);
void ore_calc_stripe_info(struct ore_layout *layout, u64 file_offset,
- struct ore_striping_info *si);
-
+ u64 length, struct ore_striping_info *si);
int ore_get_rw_state(struct ore_layout *layout, struct ore_components *comps,
bool is_reading, u64 offset, u64 length,
struct ore_io_state **ios);