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[block] Add basic multipath support

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Add basic support for multipath block devices.  The "sanboot" and
"sanhook" commands now accept a list of SAN URIs.  We open all URIs
concurrently.  The first connection to become available for issuing
block device commands is marked as the active path and used for all
subsequent commands; all other connections are then closed.  Whenever
the active path fails, we reopen all URIs and repeat the process.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2017-03-26 15:12:11 +03:00
parent c212597336
commit bb5a54b79a
10 changed files with 327 additions and 128 deletions
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3
src/include/usr/autoboot.h
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@@ -30,7 +30,8 @@ extern void set_autoboot_busloc ( unsigned int bus_type,
unsigned int location );
extern void set_autoboot_ll_addr ( const void *ll_addr, size_t len );
extern int uriboot ( struct uri *filename, struct uri *root_path, int drive,
extern int uriboot ( struct uri *filename, struct uri **root_paths,
unsigned int root_path_count, int drive,
unsigned int flags );
extern struct uri *
fetch_next_server_and_filename ( struct settings *settings );