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GFS2: Implement iomap for block_map

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This patch implements iomap for block mapping, and switches the
block_map function to use it under the covers.

The additional IOMAP_F_BOUNDARY iomap flag indicates when iomap has
reached a "metadata boundary" and fetching the next mapping is likely to
incur an additional I/O.  This flag is used for setting the bh buffer
boundary flag.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Bob Peterson
2017-02-16 10:27:16 -05:00
committed by Andreas Gruenbacher
parent 5f8bd4440d
commit 3974320ca6
4 changed files with 307 additions and 100 deletions
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3
include/linux/iomap.h
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@@ -21,7 +21,8 @@ struct vm_fault;
/*
* Flags for all iomap mappings:
*/
#define IOMAP_F_NEW 0x01 /* blocks have been newly allocated */
#define IOMAP_F_NEW 0x01 /* blocks have been newly allocated */
#define IOMAP_F_BOUNDARY 0x02 /* mapping ends at metadata boundary */
/*
* Flags that only need to be reported for IOMAP_REPORT requests: