diff options
Diffstat (limited to 'include/xen')
| -rw-r--r-- | include/xen/grant_table.h | 1 | ||||
| -rw-r--r-- | include/xen/hvc-console.h | 4 | ||||
| -rw-r--r-- | include/xen/interface/io/blkif.h | 36 | ||||
| -rw-r--r-- | include/xen/xenbus.h | 12 |
4 files changed, 44 insertions, 9 deletions
diff --git a/include/xen/grant_table.h b/include/xen/grant_table.h index 6b99bfbd785d..11e2dfce42f8 100644 --- a/include/xen/grant_table.h +++ b/include/xen/grant_table.h @@ -43,7 +43,6 @@ #include <xen/interface/grant_table.h> #include <asm/xen/hypervisor.h> -#include <asm/xen/grant_table.h> #include <xen/features.h> diff --git a/include/xen/hvc-console.h b/include/xen/hvc-console.h index 901724dc528d..b62dfef15f61 100644 --- a/include/xen/hvc-console.h +++ b/include/xen/hvc-console.h @@ -6,12 +6,12 @@ extern struct console xenboot_console; #ifdef CONFIG_HVC_XEN void xen_console_resume(void); void xen_raw_console_write(const char *str); -__attribute__((format(printf, 1, 2))) +__printf(1, 2) void xen_raw_printk(const char *fmt, ...); #else static inline void xen_console_resume(void) { } static inline void xen_raw_console_write(const char *str) { } -static inline __attribute__((format(printf, 1, 2))) +static inline __printf(1, 2) void xen_raw_printk(const char *fmt, ...) { } #endif diff --git a/include/xen/interface/io/blkif.h b/include/xen/interface/io/blkif.h index 3d5d6db864fe..9324488f23f0 100644 --- a/include/xen/interface/io/blkif.h +++ b/include/xen/interface/io/blkif.h @@ -57,6 +57,36 @@ typedef uint64_t blkif_sector_t; * "feature-flush-cache" node! */ #define BLKIF_OP_FLUSH_DISKCACHE 3 + +/* + * Recognised only if "feature-discard" is present in backend xenbus info. + * The "feature-discard" node contains a boolean indicating whether trim + * (ATA) or unmap (SCSI) - conviently called discard requests are likely + * to succeed or fail. Either way, a discard request + * may fail at any time with BLKIF_RSP_EOPNOTSUPP if it is unsupported by + * the underlying block-device hardware. The boolean simply indicates whether + * or not it is worthwhile for the frontend to attempt discard requests. + * If a backend does not recognise BLKIF_OP_DISCARD, it should *not* + * create the "feature-discard" node! + * + * Discard operation is a request for the underlying block device to mark + * extents to be erased. However, discard does not guarantee that the blocks + * will be erased from the device - it is just a hint to the device + * controller that these blocks are no longer in use. What the device + * controller does with that information is left to the controller. + * Discard operations are passed with sector_number as the + * sector index to begin discard operations at and nr_sectors as the number of + * sectors to be discarded. The specified sectors should be discarded if the + * underlying block device supports trim (ATA) or unmap (SCSI) operations, + * or a BLKIF_RSP_EOPNOTSUPP should be returned. + * More information about trim/unmap operations at: + * http://t13.org/Documents/UploadedDocuments/docs2008/ + * e07154r6-Data_Set_Management_Proposal_for_ATA-ACS2.doc + * http://www.seagate.com/staticfiles/support/disc/manuals/ + * Interface%20manuals/100293068c.pdf + */ +#define BLKIF_OP_DISCARD 5 + /* * Maximum scatter/gather segments per request. * This is carefully chosen so that sizeof(struct blkif_ring) <= PAGE_SIZE. @@ -74,6 +104,11 @@ struct blkif_request_rw { } seg[BLKIF_MAX_SEGMENTS_PER_REQUEST]; }; +struct blkif_request_discard { + blkif_sector_t sector_number; + uint64_t nr_sectors; +}; + struct blkif_request { uint8_t operation; /* BLKIF_OP_??? */ uint8_t nr_segments; /* number of segments */ @@ -81,6 +116,7 @@ struct blkif_request { uint64_t id; /* private guest value, echoed in resp */ union { struct blkif_request_rw rw; + struct blkif_request_discard discard; } u; }; diff --git a/include/xen/xenbus.h b/include/xen/xenbus.h index 553a7a21af5e..b1b6676c1c43 100644 --- a/include/xen/xenbus.h +++ b/include/xen/xenbus.h @@ -157,9 +157,9 @@ int xenbus_scanf(struct xenbus_transaction t, __attribute__((format(scanf, 4, 5))); /* Single printf and write: returns -errno or 0. */ +__printf(4, 5) int xenbus_printf(struct xenbus_transaction t, - const char *dir, const char *node, const char *fmt, ...) - __attribute__((format(printf, 4, 5))); + const char *dir, const char *node, const char *fmt, ...); /* Generic read function: NULL-terminated triples of name, * sprintf-style type string, and pointer. Returns 0 or errno.*/ @@ -201,11 +201,11 @@ int xenbus_watch_path(struct xenbus_device *dev, const char *path, struct xenbus_watch *watch, void (*callback)(struct xenbus_watch *, const char **, unsigned int)); +__printf(4, 5) int xenbus_watch_pathfmt(struct xenbus_device *dev, struct xenbus_watch *watch, void (*callback)(struct xenbus_watch *, const char **, unsigned int), - const char *pathfmt, ...) - __attribute__ ((format (printf, 4, 5))); + const char *pathfmt, ...); int xenbus_switch_state(struct xenbus_device *dev, enum xenbus_state new_state); int xenbus_grant_ring(struct xenbus_device *dev, unsigned long ring_mfn); @@ -224,9 +224,9 @@ int xenbus_free_evtchn(struct xenbus_device *dev, int port); enum xenbus_state xenbus_read_driver_state(const char *path); -__attribute__((format(printf, 3, 4))) +__printf(3, 4) void xenbus_dev_error(struct xenbus_device *dev, int err, const char *fmt, ...); -__attribute__((format(printf, 3, 4))) +__printf(3, 4) void xenbus_dev_fatal(struct xenbus_device *dev, int err, const char *fmt, ...); const char *xenbus_strstate(enum xenbus_state state); |