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pnfs-obj: osd raid engine read/write implementation

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With the use of the in-kernel osd library. Implement read/write
of data from/to osd-objects according to information specified
in the objects-layout.

Support for stripping over mirrors with a received stripe_unit.
There are however a few constrains which are not supported:
 1. Stripe Unit must be a multiple of PAGE_SIZE
 2. stripe length (stripe_unit * number_of_stripes) can not be
    bigger then 32bit.

Also support raid-groups and partial-layout. Partial-layout is
when not all the groups are received on the line, addressing
only a partial range of the file.

TODO:
  Only raid0! raid 4/5/6 support will come at later stage

A none supported layout will send IO through the MDS

[Important fallout from the last rebase]
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
[gfp_flags]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
This commit is contained in:
Boaz Harrosh
2011-05-22 19:52:19 +03:00
parent d20581aa4b
commit 04f8345038
3 changed files with 901 additions and 0 deletions
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42
fs/nfs/objlayout/objlayout.h
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@@ -58,6 +58,26 @@ OBJLAYOUT(struct pnfs_layout_hdr *lo)
return container_of(lo, struct objlayout, pnfs_layout);
}
/*
* per-I/O operation state
* embedded in objects provider io_state data structure
*/
struct objlayout_io_state {
struct pnfs_layout_segment *lseg;
struct page **pages;
unsigned pgbase;
unsigned nr_pages;
unsigned long count;
loff_t offset;
bool sync;
void *rpcdata;
int status; /* res */
int eof; /* res */
int committed; /* res */
};
/*
* Raid engine I/O API
*/
@@ -68,9 +88,24 @@ extern int objio_alloc_lseg(struct pnfs_layout_segment **outp,
gfp_t gfp_flags);
extern void objio_free_lseg(struct pnfs_layout_segment *lseg);
extern int objio_alloc_io_state(
struct pnfs_layout_segment *lseg,
struct objlayout_io_state **outp,
gfp_t gfp_flags);
extern void objio_free_io_state(struct objlayout_io_state *state);
extern ssize_t objio_read_pagelist(struct objlayout_io_state *ol_state);
extern ssize_t objio_write_pagelist(struct objlayout_io_state *ol_state,
bool stable);
/*
* callback API
*/
extern void objlayout_read_done(struct objlayout_io_state *state,
ssize_t status, bool sync);
extern void objlayout_write_done(struct objlayout_io_state *state,
ssize_t status, bool sync);
extern int objlayout_get_deviceinfo(struct pnfs_layout_hdr *pnfslay,
struct nfs4_deviceid *d_id, struct pnfs_osd_deviceaddr **deviceaddr,
gfp_t gfp_flags);
@@ -89,4 +124,11 @@ extern struct pnfs_layout_segment *objlayout_alloc_lseg(
gfp_t gfp_flags);
extern void objlayout_free_lseg(struct pnfs_layout_segment *);
extern enum pnfs_try_status objlayout_read_pagelist(
struct nfs_read_data *);
extern enum pnfs_try_status objlayout_write_pagelist(
struct nfs_write_data *,
int how);
#endif /* _OBJLAYOUT_H */