From bedbef8ad3e75a304af6361af235302bcc61d06b Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 14 May 2024 06:39:01 +0000
Subject: [PATCH] 修改内核路径
---
kernel/include/linux/blkdev.h | 1167 +++++++++++++++++++++++++++------------------------------
1 files changed, 559 insertions(+), 608 deletions(-)
diff --git a/kernel/include/linux/blkdev.h b/kernel/include/linux/blkdev.h
index cfe14fc..0b16df9 100644
--- a/kernel/include/linux/blkdev.h
+++ b/kernel/include/linux/blkdev.h
@@ -4,16 +4,13 @@
#include <linux/sched.h>
#include <linux/sched/clock.h>
-
-#ifdef CONFIG_BLOCK
-
#include <linux/major.h>
#include <linux/genhd.h>
#include <linux/list.h>
#include <linux/llist.h>
+#include <linux/minmax.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
-#include <linux/kthread.h>
#include <linux/pagemap.h>
#include <linux/backing-dev-defs.h>
#include <linux/wait.h>
@@ -28,6 +25,9 @@
#include <linux/percpu-refcount.h>
#include <linux/scatterlist.h>
#include <linux/blkzoned.h>
+#include <linux/pm.h>
+#include <linux/android_kabi.h>
+#include <linux/android_vendor.h>
struct module;
struct scsi_ioctl_command;
@@ -44,7 +44,7 @@
struct rq_qos;
struct blk_queue_stats;
struct blk_stat_callback;
-struct keyslot_manager;
+struct blk_keyslot_manager;
#define BLKDEV_MIN_RQ 4
#define BLKDEV_MAX_RQ 128 /* Default maximum */
@@ -52,32 +52,24 @@
/* Must be consistent with blk_mq_poll_stats_bkt() */
#define BLK_MQ_POLL_STATS_BKTS 16
+/* Doing classic polling */
+#define BLK_MQ_POLL_CLASSIC -1
+
/*
* Maximum number of blkcg policies allowed to be registered concurrently.
* Defined here to simplify include dependency.
*/
#define BLKCG_MAX_POLS 5
+static inline int blk_validate_block_size(unsigned int bsize)
+{
+ if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize))
+ return -EINVAL;
+
+ return 0;
+}
+
typedef void (rq_end_io_fn)(struct request *, blk_status_t);
-
-#define BLK_RL_SYNCFULL (1U << 0)
-#define BLK_RL_ASYNCFULL (1U << 1)
-
-struct request_list {
- struct request_queue *q; /* the queue this rl belongs to */
-#ifdef CONFIG_BLK_CGROUP
- struct blkcg_gq *blkg; /* blkg this request pool belongs to */
-#endif
- /*
- * count[], starved[], and wait[] are indexed by
- * BLK_RW_SYNC/BLK_RW_ASYNC
- */
- int count[2];
- int starved[2];
- mempool_t *rq_pool;
- wait_queue_head_t wait[2];
- unsigned int flags;
-};
/*
* request flags */
@@ -87,8 +79,6 @@
#define RQF_SORTED ((__force req_flags_t)(1 << 0))
/* drive already may have started this one */
#define RQF_STARTED ((__force req_flags_t)(1 << 1))
-/* uses tagged queueing */
-#define RQF_QUEUED ((__force req_flags_t)(1 << 2))
/* may not be passed by ioscheduler */
#define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3))
/* request for flush sequence */
@@ -99,18 +89,13 @@
#define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6))
/* don't call prep for this one */
#define RQF_DONTPREP ((__force req_flags_t)(1 << 7))
-/* set for "ide_preempt" requests and also for requests for which the SCSI
- "quiesce" state must be ignored. */
-#define RQF_PREEMPT ((__force req_flags_t)(1 << 8))
-/* contains copies of user pages */
-#define RQF_COPY_USER ((__force req_flags_t)(1 << 9))
/* vaguely specified driver internal error. Ignored by the block layer */
#define RQF_FAILED ((__force req_flags_t)(1 << 10))
/* don't warn about errors */
#define RQF_QUIET ((__force req_flags_t)(1 << 11))
/* elevator private data attached */
#define RQF_ELVPRIV ((__force req_flags_t)(1 << 12))
-/* account I/O stat */
+/* account into disk and partition IO statistics */
#define RQF_IO_STAT ((__force req_flags_t)(1 << 13))
/* request came from our alloc pool */
#define RQF_ALLOCED ((__force req_flags_t)(1 << 14))
@@ -118,7 +103,7 @@
#define RQF_PM ((__force req_flags_t)(1 << 15))
/* on IO scheduler merge hash */
#define RQF_HASHED ((__force req_flags_t)(1 << 16))
-/* IO stats tracking on */
+/* track IO completion time */
#define RQF_STATS ((__force req_flags_t)(1 << 17))
/* Look at ->special_vec for the actual data payload instead of the
bio chain. */
@@ -151,20 +136,17 @@
*/
struct request {
struct request_queue *q;
-#ifdef CONFIG_PREEMPT_RT_FULL
- struct work_struct work;
-#endif
struct blk_mq_ctx *mq_ctx;
+ struct blk_mq_hw_ctx *mq_hctx;
- int cpu;
unsigned int cmd_flags; /* op and common flags */
req_flags_t rq_flags;
+ int tag;
int internal_tag;
/* the following two fields are internal, NEVER access directly */
unsigned int __data_len; /* total data len */
- int tag;
sector_t __sector; /* sector cursor */
struct bio *bio;
@@ -217,7 +199,11 @@
struct gendisk *rq_disk;
struct hd_struct *part;
- /* Time that I/O was submitted to the kernel. */
+#ifdef CONFIG_BLK_RQ_ALLOC_TIME
+ /* Time that the first bio started allocating this request. */
+ u64 alloc_time_ns;
+#endif
+ /* Time that this request was allocated for this IO. */
u64 start_time_ns;
/* Time that I/O was submitted to the device. */
u64 io_start_time_ns;
@@ -225,9 +211,12 @@
#ifdef CONFIG_BLK_WBT
unsigned short wbt_flags;
#endif
-#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
- unsigned short throtl_size;
-#endif
+ /*
+ * rq sectors used for blk stats. It has the same value
+ * with blk_rq_sectors(rq), except that it never be zeroed
+ * by completion.
+ */
+ unsigned short stats_sectors;
/*
* Number of scatter-gather DMA addr+len pairs after
@@ -239,22 +228,19 @@
unsigned short nr_integrity_segments;
#endif
+#ifdef CONFIG_BLK_INLINE_ENCRYPTION
+ struct bio_crypt_ctx *crypt_ctx;
+ struct blk_ksm_keyslot *crypt_keyslot;
+#endif
+
unsigned short write_hint;
unsigned short ioprio;
-
- void *special; /* opaque pointer available for LLD use */
-
- unsigned int extra_len; /* length of alignment and padding */
enum mq_rq_state state;
refcount_t ref;
unsigned int timeout;
-
- /* access through blk_rq_set_deadline, blk_rq_deadline */
- unsigned long __deadline;
-
- struct list_head timeout_list;
+ unsigned long deadline;
union {
struct __call_single_data csd;
@@ -267,12 +253,7 @@
rq_end_io_fn *end_io;
void *end_io_data;
- /* for bidi */
- struct request *next_rq;
-
-#ifdef CONFIG_BLK_CGROUP
- struct request_list *rl; /* rl this rq is alloced from */
-#endif
+ ANDROID_KABI_RESERVE(1);
};
static inline bool blk_op_is_scsi(unsigned int op)
@@ -316,41 +297,18 @@
struct blk_queue_ctx;
-typedef void (request_fn_proc) (struct request_queue *q);
-typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio);
-typedef bool (poll_q_fn) (struct request_queue *q, blk_qc_t);
-typedef int (prep_rq_fn) (struct request_queue *, struct request *);
-typedef void (unprep_rq_fn) (struct request_queue *, struct request *);
-
struct bio_vec;
-typedef void (softirq_done_fn)(struct request *);
-typedef int (dma_drain_needed_fn)(struct request *);
-typedef int (lld_busy_fn) (struct request_queue *q);
-typedef int (bsg_job_fn) (struct bsg_job *);
-typedef int (init_rq_fn)(struct request_queue *, struct request *, gfp_t);
-typedef void (exit_rq_fn)(struct request_queue *, struct request *);
enum blk_eh_timer_return {
BLK_EH_DONE, /* drivers has completed the command */
BLK_EH_RESET_TIMER, /* reset timer and try again */
};
-typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *);
-
enum blk_queue_state {
Queue_down,
Queue_up,
};
-struct blk_queue_tag {
- struct request **tag_index; /* map of busy tags */
- unsigned long *tag_map; /* bit map of free/busy tags */
- int max_depth; /* what we will send to device */
- int real_max_depth; /* what the array can hold */
- atomic_t refcnt; /* map can be shared */
- int alloc_policy; /* tag allocation policy */
- int next_tag; /* next tag */
-};
#define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
#define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
@@ -359,11 +317,14 @@
/*
* Zoned block device models (zoned limit).
+ *
+ * Note: This needs to be ordered from the least to the most severe
+ * restrictions for the inheritance in blk_stack_limits() to work.
*/
enum blk_zoned_model {
- BLK_ZONED_NONE, /* Regular block device */
- BLK_ZONED_HA, /* Host-aware zoned block device */
- BLK_ZONED_HM, /* Host-managed zoned block device */
+ BLK_ZONED_NONE = 0, /* Regular block device */
+ BLK_ZONED_HA, /* Host-aware zoned block device */
+ BLK_ZONED_HM, /* Host-managed zoned block device */
};
struct queue_limits {
@@ -385,6 +346,7 @@
unsigned int max_hw_discard_sectors;
unsigned int max_write_same_sectors;
unsigned int max_write_zeroes_sectors;
+ unsigned int max_zone_append_sectors;
unsigned int discard_granularity;
unsigned int discard_alignment;
@@ -394,30 +356,40 @@
unsigned char misaligned;
unsigned char discard_misaligned;
- unsigned char cluster;
unsigned char raid_partial_stripes_expensive;
enum blk_zoned_model zoned;
+
+ ANDROID_KABI_RESERVE(1);
};
+
+typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx,
+ void *data);
+
+void blk_queue_set_zoned(struct gendisk *disk, enum blk_zoned_model model);
#ifdef CONFIG_BLK_DEV_ZONED
-struct blk_zone_report_hdr {
- unsigned int nr_zones;
- u8 padding[60];
-};
-
-extern int blkdev_report_zones(struct block_device *bdev,
- sector_t sector, struct blk_zone *zones,
- unsigned int *nr_zones, gfp_t gfp_mask);
-extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors,
- sector_t nr_sectors, gfp_t gfp_mask);
+#define BLK_ALL_ZONES ((unsigned int)-1)
+int blkdev_report_zones(struct block_device *bdev, sector_t sector,
+ unsigned int nr_zones, report_zones_cb cb, void *data);
+unsigned int blkdev_nr_zones(struct gendisk *disk);
+extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op,
+ sector_t sectors, sector_t nr_sectors,
+ gfp_t gfp_mask);
+int blk_revalidate_disk_zones(struct gendisk *disk,
+ void (*update_driver_data)(struct gendisk *disk));
extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg);
-extern int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode,
- unsigned int cmd, unsigned long arg);
+extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg);
#else /* CONFIG_BLK_DEV_ZONED */
+
+static inline unsigned int blkdev_nr_zones(struct gendisk *disk)
+{
+ return 0;
+}
static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
fmode_t mode, unsigned int cmd,
@@ -426,9 +398,9 @@
return -ENOTTY;
}
-static inline int blkdev_reset_zones_ioctl(struct block_device *bdev,
- fmode_t mode, unsigned int cmd,
- unsigned long arg)
+static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev,
+ fmode_t mode, unsigned int cmd,
+ unsigned long arg)
{
return -ENOTTY;
}
@@ -436,66 +408,24 @@
#endif /* CONFIG_BLK_DEV_ZONED */
struct request_queue {
- /*
- * Together with queue_head for cacheline sharing
- */
- struct list_head queue_head;
struct request *last_merge;
struct elevator_queue *elevator;
- int nr_rqs[2]; /* # allocated [a]sync rqs */
- int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */
+
+ struct percpu_ref q_usage_counter;
struct blk_queue_stats *stats;
struct rq_qos *rq_qos;
- /*
- * If blkcg is not used, @q->root_rl serves all requests. If blkcg
- * is used, root blkg allocates from @q->root_rl and all other
- * blkgs from their own blkg->rl. Which one to use should be
- * determined using bio_request_list().
- */
- struct request_list root_rl;
-
- request_fn_proc *request_fn;
- make_request_fn *make_request_fn;
- poll_q_fn *poll_fn;
- prep_rq_fn *prep_rq_fn;
- unprep_rq_fn *unprep_rq_fn;
- softirq_done_fn *softirq_done_fn;
- rq_timed_out_fn *rq_timed_out_fn;
- dma_drain_needed_fn *dma_drain_needed;
- lld_busy_fn *lld_busy_fn;
- /* Called just after a request is allocated */
- init_rq_fn *init_rq_fn;
- /* Called just before a request is freed */
- exit_rq_fn *exit_rq_fn;
- /* Called from inside blk_get_request() */
- void (*initialize_rq_fn)(struct request *rq);
-
const struct blk_mq_ops *mq_ops;
-
- unsigned int *mq_map;
/* sw queues */
struct blk_mq_ctx __percpu *queue_ctx;
- unsigned int nr_queues;
unsigned int queue_depth;
/* hw dispatch queues */
struct blk_mq_hw_ctx **queue_hw_ctx;
unsigned int nr_hw_queues;
-
- /*
- * Dispatch queue sorting
- */
- sector_t end_sector;
- struct request *boundary_rq;
-
- /*
- * Delayed queue handling
- */
- struct delayed_work delay_work;
struct backing_dev_info *backing_dev_info;
@@ -511,8 +441,7 @@
unsigned long queue_flags;
/*
* Number of contexts that have called blk_set_pm_only(). If this
- * counter is above zero then only RQF_PM and RQF_PREEMPT requests are
- * processed.
+ * counter is above zero then only RQF_PM requests are processed.
*/
atomic_t pm_only;
@@ -527,13 +456,7 @@
*/
gfp_t bounce_gfp;
- /*
- * protects queue structures from reentrancy. ->__queue_lock should
- * _never_ be used directly, it is queue private. always use
- * ->queue_lock.
- */
- spinlock_t __queue_lock;
- spinlock_t *queue_lock;
+ spinlock_t queue_lock;
/*
* queue kobject
@@ -543,7 +466,7 @@
/*
* mq queue kobject
*/
- struct kobject mq_kobj;
+ struct kobject *mq_kobj;
#ifdef CONFIG_BLK_DEV_INTEGRITY
struct blk_integrity integrity;
@@ -551,7 +474,7 @@
#ifdef CONFIG_PM
struct device *dev;
- int rpm_status;
+ enum rpm_status rpm_status;
unsigned int nr_pending;
#endif
@@ -559,29 +482,13 @@
* queue settings
*/
unsigned long nr_requests; /* Max # of requests */
- unsigned int nr_congestion_on;
- unsigned int nr_congestion_off;
- unsigned int nr_batching;
- unsigned int dma_drain_size;
- void *dma_drain_buffer;
unsigned int dma_pad_mask;
unsigned int dma_alignment;
- struct blk_queue_tag *queue_tags;
-
- unsigned int nr_sorted;
- unsigned int in_flight[2];
-
- /*
- * Number of active block driver functions for which blk_drain_queue()
- * must wait. Must be incremented around functions that unlock the
- * queue_lock internally, e.g. scsi_request_fn().
- */
- unsigned int request_fn_active;
#ifdef CONFIG_BLK_INLINE_ENCRYPTION
/* Inline crypto capabilities */
- struct keyslot_manager *ksm;
+ struct blk_keyslot_manager *ksm;
#endif
unsigned int rq_timeout;
@@ -592,7 +499,8 @@
struct timer_list timeout;
struct work_struct timeout_work;
- struct list_head timeout_list;
+
+ atomic_t nr_active_requests_shared_sbitmap;
struct list_head icq_list;
#ifdef CONFIG_BLK_CGROUP
@@ -603,13 +511,15 @@
struct queue_limits limits;
+ unsigned int required_elevator_features;
+
#ifdef CONFIG_BLK_DEV_ZONED
/*
* Zoned block device information for request dispatch control.
* nr_zones is the total number of zones of the device. This is always
- * 0 for regular block devices. seq_zones_bitmap is a bitmap of nr_zones
- * bits which indicates if a zone is conventional (bit clear) or
- * sequential (bit set). seq_zones_wlock is a bitmap of nr_zones
+ * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones
+ * bits which indicates if a zone is conventional (bit set) or
+ * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones
* bits which indicates if a zone is write locked, that is, if a write
* request targeting the zone was dispatched. All three fields are
* initialized by the low level device driver (e.g. scsi/sd.c).
@@ -622,8 +532,10 @@
* blk_mq_unfreeze_queue().
*/
unsigned int nr_zones;
- unsigned long *seq_zones_bitmap;
+ unsigned long *conv_zones_bitmap;
unsigned long *seq_zones_wlock;
+ unsigned int max_open_zones;
+ unsigned int max_active_zones;
#endif /* CONFIG_BLK_DEV_ZONED */
/*
@@ -632,9 +544,9 @@
unsigned int sg_timeout;
unsigned int sg_reserved_size;
int node;
+ struct mutex debugfs_mutex;
#ifdef CONFIG_BLK_DEV_IO_TRACE
struct blk_trace __rcu *blk_trace;
- struct mutex blk_trace_mutex;
#endif
/*
* for flush operations
@@ -646,12 +558,20 @@
struct delayed_work requeue_work;
struct mutex sysfs_lock;
+ struct mutex sysfs_dir_lock;
- int bypass_depth;
- atomic_t mq_freeze_depth;
+ /*
+ * for reusing dead hctx instance in case of updating
+ * nr_hw_queues
+ */
+ struct list_head unused_hctx_list;
+ spinlock_t unused_hctx_lock;
- bsg_job_fn *bsg_job_fn;
+ int mq_freeze_depth;
+
+#if defined(CONFIG_BLK_DEV_BSG)
struct bsg_class_device bsg_dev;
+#endif
#ifdef CONFIG_BLK_DEV_THROTTLING
/* Throttle data */
@@ -659,91 +579,105 @@
#endif
struct rcu_head rcu_head;
wait_queue_head_t mq_freeze_wq;
- struct work_struct mq_pcpu_wake;
- struct percpu_ref q_usage_counter;
- struct list_head all_q_node;
+ /*
+ * Protect concurrent access to q_usage_counter by
+ * percpu_ref_kill() and percpu_ref_reinit().
+ */
+ struct mutex mq_freeze_lock;
struct blk_mq_tag_set *tag_set;
struct list_head tag_set_list;
struct bio_set bio_split;
-#ifdef CONFIG_BLK_DEBUG_FS
struct dentry *debugfs_dir;
+
+#ifdef CONFIG_BLK_DEBUG_FS
struct dentry *sched_debugfs_dir;
+ struct dentry *rqos_debugfs_dir;
#endif
bool mq_sysfs_init_done;
size_t cmd_size;
- void *rq_alloc_data;
-
- struct work_struct release_work;
#define BLK_MAX_WRITE_HINTS 5
u64 write_hints[BLK_MAX_WRITE_HINTS];
+
+ ANDROID_KABI_RESERVE(1);
+ ANDROID_KABI_RESERVE(2);
+ ANDROID_KABI_RESERVE(3);
+ ANDROID_KABI_RESERVE(4);
+ ANDROID_OEM_DATA(1);
};
-#define QUEUE_FLAG_QUEUED 0 /* uses generic tag queueing */
-#define QUEUE_FLAG_STOPPED 1 /* queue is stopped */
-#define QUEUE_FLAG_DYING 2 /* queue being torn down */
-#define QUEUE_FLAG_BYPASS 3 /* act as dumb FIFO queue */
-#define QUEUE_FLAG_BIDI 4 /* queue supports bidi requests */
-#define QUEUE_FLAG_NOMERGES 5 /* disable merge attempts */
-#define QUEUE_FLAG_SAME_COMP 6 /* complete on same CPU-group */
-#define QUEUE_FLAG_FAIL_IO 7 /* fake timeout */
-#define QUEUE_FLAG_NONROT 9 /* non-rotational device (SSD) */
-#define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
-#define QUEUE_FLAG_IO_STAT 10 /* do IO stats */
-#define QUEUE_FLAG_DISCARD 11 /* supports DISCARD */
-#define QUEUE_FLAG_NOXMERGES 12 /* No extended merges */
-#define QUEUE_FLAG_ADD_RANDOM 13 /* Contributes to random pool */
-#define QUEUE_FLAG_SECERASE 14 /* supports secure erase */
-#define QUEUE_FLAG_SAME_FORCE 15 /* force complete on same CPU */
-#define QUEUE_FLAG_DEAD 16 /* queue tear-down finished */
-#define QUEUE_FLAG_INIT_DONE 17 /* queue is initialized */
-#define QUEUE_FLAG_NO_SG_MERGE 18 /* don't attempt to merge SG segments*/
-#define QUEUE_FLAG_POLL 19 /* IO polling enabled if set */
-#define QUEUE_FLAG_WC 20 /* Write back caching */
-#define QUEUE_FLAG_FUA 21 /* device supports FUA writes */
-#define QUEUE_FLAG_FLUSH_NQ 22 /* flush not queueuable */
-#define QUEUE_FLAG_DAX 23 /* device supports DAX */
-#define QUEUE_FLAG_STATS 24 /* track rq completion times */
-#define QUEUE_FLAG_POLL_STATS 25 /* collecting stats for hybrid polling */
-#define QUEUE_FLAG_REGISTERED 26 /* queue has been registered to a disk */
-#define QUEUE_FLAG_SCSI_PASSTHROUGH 27 /* queue supports SCSI commands */
-#define QUEUE_FLAG_QUIESCED 28 /* queue has been quiesced */
-
-#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
- (1 << QUEUE_FLAG_SAME_COMP) | \
- (1 << QUEUE_FLAG_ADD_RANDOM))
+/* Keep blk_queue_flag_name[] in sync with the definitions below */
+#define QUEUE_FLAG_STOPPED 0 /* queue is stopped */
+#define QUEUE_FLAG_DYING 1 /* queue being torn down */
+#define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */
+#define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */
+#define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */
+#define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */
+#define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
+#define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
+#define QUEUE_FLAG_DISCARD 8 /* supports DISCARD */
+#define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
+#define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */
+#define QUEUE_FLAG_SECERASE 11 /* supports secure erase */
+#define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
+#define QUEUE_FLAG_DEAD 13 /* queue tear-down finished */
+#define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */
+#define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */
+#define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */
+#define QUEUE_FLAG_WC 17 /* Write back caching */
+#define QUEUE_FLAG_FUA 18 /* device supports FUA writes */
+#define QUEUE_FLAG_DAX 19 /* device supports DAX */
+#define QUEUE_FLAG_STATS 20 /* track IO start and completion times */
+#define QUEUE_FLAG_POLL_STATS 21 /* collecting stats for hybrid polling */
+#define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */
+#define QUEUE_FLAG_SCSI_PASSTHROUGH 23 /* queue supports SCSI commands */
+#define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */
+#define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */
+#define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */
+#define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */
+#define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */
+#define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */
#define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
- (1 << QUEUE_FLAG_SAME_COMP) | \
- (1 << QUEUE_FLAG_POLL))
+ (1 << QUEUE_FLAG_SAME_COMP) | \
+ (1 << QUEUE_FLAG_NOWAIT))
void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
-bool blk_queue_flag_test_and_clear(unsigned int flag, struct request_queue *q);
-#define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
#define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
#define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
-#define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
#define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
#define blk_queue_noxmerges(q) \
test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
#define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
+#define blk_queue_stable_writes(q) \
+ test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags)
#define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
#define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
#define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
+#define blk_queue_zone_resetall(q) \
+ test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
#define blk_queue_secure_erase(q) \
(test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
#define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
#define blk_queue_scsi_passthrough(q) \
test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags)
+#define blk_queue_pci_p2pdma(q) \
+ test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
+#ifdef CONFIG_BLK_RQ_ALLOC_TIME
+#define blk_queue_rq_alloc_time(q) \
+ test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)
+#else
+#define blk_queue_rq_alloc_time(q) false
+#endif
#define blk_noretry_request(rq) \
((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
@@ -752,47 +686,38 @@
#define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
#define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags)
#define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
+#define blk_queue_nowait(q) test_bit(QUEUE_FLAG_NOWAIT, &(q)->queue_flags)
extern void blk_set_pm_only(struct request_queue *q);
extern void blk_clear_pm_only(struct request_queue *q);
-
-static inline int queue_in_flight(struct request_queue *q)
-{
- return q->in_flight[0] + q->in_flight[1];
-}
static inline bool blk_account_rq(struct request *rq)
{
return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq);
}
-#define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
-#define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
-/* rq->queuelist of dequeued request must be list_empty() */
-#define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
-
#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
#define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
-/*
- * Driver can handle struct request, if it either has an old style
- * request_fn defined, or is blk-mq based.
- */
-static inline bool queue_is_rq_based(struct request_queue *q)
-{
- return q->request_fn || q->mq_ops;
-}
+#define rq_dma_dir(rq) \
+ (op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE)
-static inline unsigned int blk_queue_cluster(struct request_queue *q)
+#define dma_map_bvec(dev, bv, dir, attrs) \
+ dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
+ (dir), (attrs))
+
+static inline bool queue_is_mq(struct request_queue *q)
{
- return q->limits.cluster;
+ return q->mq_ops;
}
static inline enum blk_zoned_model
blk_queue_zoned_model(struct request_queue *q)
{
- return q->limits.zoned;
+ if (IS_ENABLED(CONFIG_BLK_DEV_ZONED))
+ return q->limits.zoned;
+ return BLK_ZONED_NONE;
}
static inline bool blk_queue_is_zoned(struct request_queue *q)
@@ -806,12 +731,17 @@
}
}
-static inline unsigned int blk_queue_zone_sectors(struct request_queue *q)
+static inline sector_t blk_queue_zone_sectors(struct request_queue *q)
{
return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
}
#ifdef CONFIG_BLK_DEV_ZONED
+static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
+{
+ return blk_queue_is_zoned(q) ? q->nr_zones : 0;
+}
+
static inline unsigned int blk_queue_zone_no(struct request_queue *q,
sector_t sector)
{
@@ -823,36 +753,62 @@
static inline bool blk_queue_zone_is_seq(struct request_queue *q,
sector_t sector)
{
- if (!blk_queue_is_zoned(q) || !q->seq_zones_bitmap)
+ if (!blk_queue_is_zoned(q))
return false;
- return test_bit(blk_queue_zone_no(q, sector), q->seq_zones_bitmap);
+ if (!q->conv_zones_bitmap)
+ return true;
+ return !test_bit(blk_queue_zone_no(q, sector), q->conv_zones_bitmap);
+}
+
+static inline void blk_queue_max_open_zones(struct request_queue *q,
+ unsigned int max_open_zones)
+{
+ q->max_open_zones = max_open_zones;
+}
+
+static inline unsigned int queue_max_open_zones(const struct request_queue *q)
+{
+ return q->max_open_zones;
+}
+
+static inline void blk_queue_max_active_zones(struct request_queue *q,
+ unsigned int max_active_zones)
+{
+ q->max_active_zones = max_active_zones;
+}
+
+static inline unsigned int queue_max_active_zones(const struct request_queue *q)
+{
+ return q->max_active_zones;
+}
+#else /* CONFIG_BLK_DEV_ZONED */
+static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
+{
+ return 0;
+}
+static inline bool blk_queue_zone_is_seq(struct request_queue *q,
+ sector_t sector)
+{
+ return false;
+}
+static inline unsigned int blk_queue_zone_no(struct request_queue *q,
+ sector_t sector)
+{
+ return 0;
+}
+static inline unsigned int queue_max_open_zones(const struct request_queue *q)
+{
+ return 0;
+}
+static inline unsigned int queue_max_active_zones(const struct request_queue *q)
+{
+ return 0;
}
#endif /* CONFIG_BLK_DEV_ZONED */
static inline bool rq_is_sync(struct request *rq)
{
return op_is_sync(rq->cmd_flags);
-}
-
-static inline bool blk_rl_full(struct request_list *rl, bool sync)
-{
- unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
-
- return rl->flags & flag;
-}
-
-static inline void blk_set_rl_full(struct request_list *rl, bool sync)
-{
- unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
-
- rl->flags |= flag;
-}
-
-static inline void blk_clear_rl_full(struct request_list *rl, bool sync)
-{
- unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
-
- rl->flags &= ~flag;
}
static inline bool rq_mergeable(struct request *rq)
@@ -864,6 +820,9 @@
return false;
if (req_op(rq) == REQ_OP_WRITE_ZEROES)
+ return false;
+
+ if (req_op(rq) == REQ_OP_ZONE_APPEND)
return false;
if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
@@ -890,16 +849,6 @@
return q->nr_requests;
}
-
-/*
- * q->prep_rq_fn return values
- */
-enum {
- BLKPREP_OK, /* serve it */
- BLKPREP_KILL, /* fatal error, kill, return -EIO */
- BLKPREP_DEFER, /* leave on queue */
- BLKPREP_INVALID, /* invalid command, kill, return -EREMOTEIO */
-};
extern unsigned long blk_max_low_pfn, blk_max_pfn;
@@ -950,6 +899,10 @@
__rq_for_each_bio(_iter.bio, _rq) \
bio_for_each_segment(bvl, _iter.bio, _iter.iter)
+#define rq_for_each_bvec(bvl, _rq, _iter) \
+ __rq_for_each_bio(_iter.bio, _rq) \
+ bio_for_each_bvec(bvl, _iter.bio, _iter.iter)
+
#define rq_iter_last(bvec, _iter) \
(_iter.bio->bi_next == NULL && \
bio_iter_last(bvec, _iter.iter))
@@ -967,15 +920,11 @@
extern int blk_register_queue(struct gendisk *disk);
extern void blk_unregister_queue(struct gendisk *disk);
-extern blk_qc_t generic_make_request(struct bio *bio);
-extern blk_qc_t direct_make_request(struct bio *bio);
+blk_qc_t submit_bio_noacct(struct bio *bio);
extern void blk_rq_init(struct request_queue *q, struct request *rq);
-extern void blk_init_request_from_bio(struct request *req, struct bio *bio);
extern void blk_put_request(struct request *);
-extern void __blk_put_request(struct request_queue *, struct request *);
extern struct request *blk_get_request(struct request_queue *, unsigned int op,
blk_mq_req_flags_t flags);
-extern void blk_requeue_request(struct request_queue *, struct request *);
extern int blk_lld_busy(struct request_queue *q);
extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
struct bio_set *bs, gfp_t gfp_mask,
@@ -985,9 +934,7 @@
extern blk_status_t blk_insert_cloned_request(struct request_queue *q,
struct request *rq);
extern int blk_rq_append_bio(struct request *rq, struct bio **bio);
-extern void blk_delay_queue(struct request_queue *, unsigned long);
-extern void blk_queue_split(struct request_queue *, struct bio **);
-extern void blk_recount_segments(struct request_queue *, struct bio *);
+extern void blk_queue_split(struct bio **);
extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int);
extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
unsigned int, void __user *);
@@ -995,18 +942,12 @@
unsigned int, void __user *);
extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
struct scsi_ioctl_command __user *);
+extern int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp);
+extern int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp);
extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
extern void blk_queue_exit(struct request_queue *q);
-extern void blk_start_queue(struct request_queue *q);
-extern void blk_start_queue_async(struct request_queue *q);
-extern void blk_stop_queue(struct request_queue *q);
extern void blk_sync_queue(struct request_queue *q);
-extern void __blk_stop_queue(struct request_queue *q);
-extern void __blk_run_queue(struct request_queue *q);
-extern void __blk_run_queue_uncond(struct request_queue *q);
-extern void blk_run_queue(struct request_queue *);
-extern void blk_run_queue_async(struct request_queue *q);
extern int blk_rq_map_user(struct request_queue *, struct request *,
struct rq_map_data *, void __user *, unsigned long,
gfp_t);
@@ -1020,10 +961,13 @@
extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
struct request *, int, rq_end_io_fn *);
+/* Helper to convert REQ_OP_XXX to its string format XXX */
+extern const char *blk_op_str(unsigned int op);
+
int blk_status_to_errno(blk_status_t status);
blk_status_t errno_to_blk_status(int errno);
-bool blk_poll(struct request_queue *q, blk_qc_t cookie);
+int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin);
static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
{
@@ -1050,6 +994,7 @@
* blk_rq_err_bytes() : bytes left till the next error boundary
* blk_rq_sectors() : sectors left in the entire request
* blk_rq_cur_sectors() : sectors left in the current segment
+ * blk_rq_stats_sectors() : sectors of the entire request used for stats
*/
static inline sector_t blk_rq_pos(const struct request *rq)
{
@@ -1078,7 +1023,16 @@
return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT;
}
+static inline unsigned int blk_rq_stats_sectors(const struct request *rq)
+{
+ return rq->stats_sectors;
+}
+
#ifdef CONFIG_BLK_DEV_ZONED
+
+/* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
+const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
+
static inline unsigned int blk_rq_zone_no(struct request *rq)
{
return blk_queue_zone_no(rq->q, blk_rq_pos(rq));
@@ -1103,6 +1057,17 @@
return blk_rq_bytes(rq);
}
+/*
+ * Return the first full biovec in the request. The caller needs to check that
+ * there are any bvecs before calling this helper.
+ */
+static inline struct bio_vec req_bvec(struct request *rq)
+{
+ if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
+ return rq->special_vec;
+ return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter);
+}
+
static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
int op)
{
@@ -1124,13 +1089,22 @@
* file system requests.
*/
static inline unsigned int blk_max_size_offset(struct request_queue *q,
- sector_t offset)
+ sector_t offset,
+ unsigned int chunk_sectors)
{
- if (!q->limits.chunk_sectors)
- return q->limits.max_sectors;
+ if (!chunk_sectors) {
+ if (q->limits.chunk_sectors)
+ chunk_sectors = q->limits.chunk_sectors;
+ else
+ return q->limits.max_sectors;
+ }
- return min(q->limits.max_sectors, (unsigned int)(q->limits.chunk_sectors -
- (offset & (q->limits.chunk_sectors - 1))));
+ if (likely(is_power_of_2(chunk_sectors)))
+ chunk_sectors -= offset & (chunk_sectors - 1);
+ else
+ chunk_sectors -= sector_div(offset, chunk_sectors);
+
+ return min(q->limits.max_sectors, chunk_sectors);
}
static inline unsigned int blk_rq_get_max_sectors(struct request *rq,
@@ -1146,7 +1120,7 @@
req_op(rq) == REQ_OP_SECURE_ERASE)
return blk_queue_get_max_sectors(q, req_op(rq));
- return min(blk_max_size_offset(q, offset),
+ return min(blk_max_size_offset(q, offset, 0),
blk_queue_get_max_sectors(q, req_op(rq)));
}
@@ -1161,13 +1135,6 @@
return nr_bios;
}
-/*
- * Request issue related functions.
- */
-extern struct request *blk_peek_request(struct request_queue *q);
-extern void blk_start_request(struct request *rq);
-extern struct request *blk_fetch_request(struct request_queue *q);
-
void blk_steal_bios(struct bio_list *list, struct request *rq);
/*
@@ -1175,39 +1142,16 @@
*
* blk_update_request() completes given number of bytes and updates
* the request without completing it.
- *
- * blk_end_request() and friends. __blk_end_request() must be called
- * with the request queue spinlock acquired.
- *
- * Several drivers define their own end_request and call
- * blk_end_request() for parts of the original function.
- * This prevents code duplication in drivers.
*/
extern bool blk_update_request(struct request *rq, blk_status_t error,
unsigned int nr_bytes);
-extern void blk_finish_request(struct request *rq, blk_status_t error);
-extern bool blk_end_request(struct request *rq, blk_status_t error,
- unsigned int nr_bytes);
-extern void blk_end_request_all(struct request *rq, blk_status_t error);
-extern bool __blk_end_request(struct request *rq, blk_status_t error,
- unsigned int nr_bytes);
-extern void __blk_end_request_all(struct request *rq, blk_status_t error);
-extern bool __blk_end_request_cur(struct request *rq, blk_status_t error);
-extern void blk_complete_request(struct request *);
-extern void __blk_complete_request(struct request *);
extern void blk_abort_request(struct request *);
-extern void blk_unprep_request(struct request *);
/*
* Access functions for manipulating queue properties
*/
-extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn,
- spinlock_t *lock, int node_id);
-extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *);
-extern int blk_init_allocated_queue(struct request_queue *);
extern void blk_cleanup_queue(struct request_queue *);
-extern void blk_queue_make_request(struct request_queue *, make_request_fn *);
extern void blk_queue_bounce_limit(struct request_queue *, u64);
extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
@@ -1222,9 +1166,12 @@
extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
unsigned int max_write_same_sectors);
extern void blk_queue_logical_block_size(struct request_queue *, unsigned int);
+extern void blk_queue_max_zone_append_sectors(struct request_queue *q,
+ unsigned int max_zone_append_sectors);
extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
extern void blk_queue_alignment_offset(struct request_queue *q,
unsigned int alignment);
+void blk_queue_update_readahead(struct request_queue *q);
extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
@@ -1234,28 +1181,19 @@
extern void blk_set_stacking_limits(struct queue_limits *lim);
extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
sector_t offset);
-extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
- sector_t offset);
extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
sector_t offset);
-extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
-extern void blk_queue_dma_pad(struct request_queue *, unsigned int);
extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
-extern int blk_queue_dma_drain(struct request_queue *q,
- dma_drain_needed_fn *dma_drain_needed,
- void *buf, unsigned int size);
-extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn);
extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
-extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn);
-extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn);
extern void blk_queue_dma_alignment(struct request_queue *, int);
extern void blk_queue_update_dma_alignment(struct request_queue *, int);
-extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *);
-extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *);
extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
-extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable);
extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
+extern void blk_queue_required_elevator_features(struct request_queue *q,
+ unsigned int features);
+extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
+ struct device *dev);
/*
* Number of physical segments as sent to the device.
@@ -1282,40 +1220,23 @@
return max_t(unsigned short, rq->nr_phys_segments, 1);
}
-extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *);
+int __blk_rq_map_sg(struct request_queue *q, struct request *rq,
+ struct scatterlist *sglist, struct scatterlist **last_sg);
+static inline int blk_rq_map_sg(struct request_queue *q, struct request *rq,
+ struct scatterlist *sglist)
+{
+ struct scatterlist *last_sg = NULL;
+
+ return __blk_rq_map_sg(q, rq, sglist, &last_sg);
+}
extern void blk_dump_rq_flags(struct request *, char *);
-extern long nr_blockdev_pages(void);
bool __must_check blk_get_queue(struct request_queue *);
-struct request_queue *blk_alloc_queue(gfp_t);
-struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id,
- spinlock_t *lock);
+struct request_queue *blk_alloc_queue(int node_id);
extern void blk_put_queue(struct request_queue *);
extern void blk_set_queue_dying(struct request_queue *);
-/*
- * block layer runtime pm functions
- */
-#ifdef CONFIG_PM
-extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev);
-extern int blk_pre_runtime_suspend(struct request_queue *q);
-extern void blk_post_runtime_suspend(struct request_queue *q, int err);
-extern void blk_pre_runtime_resume(struct request_queue *q);
-extern void blk_post_runtime_resume(struct request_queue *q, int err);
-extern void blk_set_runtime_active(struct request_queue *q);
-#else
-static inline void blk_pm_runtime_init(struct request_queue *q,
- struct device *dev) {}
-static inline int blk_pre_runtime_suspend(struct request_queue *q)
-{
- return -ENOSYS;
-}
-static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {}
-static inline void blk_pre_runtime_resume(struct request_queue *q) {}
-static inline void blk_post_runtime_resume(struct request_queue *q, int err) {}
-static inline void blk_set_runtime_active(struct request_queue *q) {}
-#endif
-
+#ifdef CONFIG_BLOCK
/*
* blk_plug permits building a queue of related requests by holding the I/O
* fragments for a short period. This allows merging of sequential requests
@@ -1329,12 +1250,12 @@
* schedule() where blk_schedule_flush_plug() is called.
*/
struct blk_plug {
- struct list_head list; /* requests */
struct list_head mq_list; /* blk-mq requests */
struct list_head cb_list; /* md requires an unplug callback */
+ unsigned short rq_count;
+ bool multiple_queues;
+ bool nowait;
};
-#define BLK_MAX_REQUEST_COUNT 16
-#define BLK_PLUG_FLUSH_SIZE (128 * 1024)
struct blk_plug_cb;
typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
@@ -1370,32 +1291,51 @@
struct blk_plug *plug = tsk->plug;
return plug &&
- (!list_empty(&plug->list) ||
- !list_empty(&plug->mq_list) ||
+ (!list_empty(&plug->mq_list) ||
!list_empty(&plug->cb_list));
}
-/*
- * tag stuff
- */
-extern int blk_queue_start_tag(struct request_queue *, struct request *);
-extern struct request *blk_queue_find_tag(struct request_queue *, int);
-extern void blk_queue_end_tag(struct request_queue *, struct request *);
-extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int);
-extern void blk_queue_free_tags(struct request_queue *);
-extern int blk_queue_resize_tags(struct request_queue *, int);
-extern struct blk_queue_tag *blk_init_tags(int, int);
-extern void blk_free_tags(struct blk_queue_tag *);
+int blkdev_issue_flush(struct block_device *, gfp_t);
+long nr_blockdev_pages(void);
+#else /* CONFIG_BLOCK */
+struct blk_plug {
+};
-static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
- int tag)
+static inline void blk_start_plug(struct blk_plug *plug)
{
- if (unlikely(bqt == NULL || tag >= bqt->real_max_depth))
- return NULL;
- return bqt->tag_index[tag];
}
-extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *);
+static inline void blk_finish_plug(struct blk_plug *plug)
+{
+}
+
+static inline void blk_flush_plug(struct task_struct *task)
+{
+}
+
+static inline void blk_schedule_flush_plug(struct task_struct *task)
+{
+}
+
+
+static inline bool blk_needs_flush_plug(struct task_struct *tsk)
+{
+ return false;
+}
+
+static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask)
+{
+ return 0;
+}
+
+static inline long nr_blockdev_pages(void)
+{
+ return 0;
+}
+#endif /* CONFIG_BLOCK */
+
+extern void blk_io_schedule(void);
+
extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
sector_t nr_sects, gfp_t gfp_mask, struct page *page);
@@ -1439,6 +1379,11 @@
extern int blk_verify_command(unsigned char *cmd, fmode_t mode);
+static inline bool bdev_is_partition(struct block_device *bdev)
+{
+ return bdev->bd_partno;
+}
+
enum blk_default_limits {
BLK_MAX_SEGMENTS = 128,
BLK_SAFE_MAX_SECTORS = 255,
@@ -1447,42 +1392,50 @@
BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
};
-static inline unsigned long queue_segment_boundary(struct request_queue *q)
+static inline unsigned long queue_segment_boundary(const struct request_queue *q)
{
return q->limits.seg_boundary_mask;
}
-static inline unsigned long queue_virt_boundary(struct request_queue *q)
+static inline unsigned long queue_virt_boundary(const struct request_queue *q)
{
return q->limits.virt_boundary_mask;
}
-static inline unsigned int queue_max_sectors(struct request_queue *q)
+static inline unsigned int queue_max_sectors(const struct request_queue *q)
{
return q->limits.max_sectors;
}
-static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
+static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
{
return q->limits.max_hw_sectors;
}
-static inline unsigned short queue_max_segments(struct request_queue *q)
+static inline unsigned short queue_max_segments(const struct request_queue *q)
{
return q->limits.max_segments;
}
-static inline unsigned short queue_max_discard_segments(struct request_queue *q)
+static inline unsigned short queue_max_discard_segments(const struct request_queue *q)
{
return q->limits.max_discard_segments;
}
-static inline unsigned int queue_max_segment_size(struct request_queue *q)
+static inline unsigned int queue_max_segment_size(const struct request_queue *q)
{
return q->limits.max_segment_size;
}
-static inline unsigned queue_logical_block_size(struct request_queue *q)
+static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q)
+{
+
+ const struct queue_limits *l = &q->limits;
+
+ return min(l->max_zone_append_sectors, l->max_sectors);
+}
+
+static inline unsigned queue_logical_block_size(const struct request_queue *q)
{
int retval = 512;
@@ -1497,7 +1450,7 @@
return queue_logical_block_size(bdev_get_queue(bdev));
}
-static inline unsigned int queue_physical_block_size(struct request_queue *q)
+static inline unsigned int queue_physical_block_size(const struct request_queue *q)
{
return q->limits.physical_block_size;
}
@@ -1507,7 +1460,7 @@
return queue_physical_block_size(bdev_get_queue(bdev));
}
-static inline unsigned int queue_io_min(struct request_queue *q)
+static inline unsigned int queue_io_min(const struct request_queue *q)
{
return q->limits.io_min;
}
@@ -1517,7 +1470,7 @@
return queue_io_min(bdev_get_queue(bdev));
}
-static inline unsigned int queue_io_opt(struct request_queue *q)
+static inline unsigned int queue_io_opt(const struct request_queue *q)
{
return q->limits.io_opt;
}
@@ -1527,7 +1480,7 @@
return queue_io_opt(bdev_get_queue(bdev));
}
-static inline int queue_alignment_offset(struct request_queue *q)
+static inline int queue_alignment_offset(const struct request_queue *q)
{
if (q->limits.misaligned)
return -1;
@@ -1550,14 +1503,13 @@
if (q->limits.misaligned)
return -1;
-
- if (bdev != bdev->bd_contains)
- return bdev->bd_part->alignment_offset;
-
+ if (bdev_is_partition(bdev))
+ return queue_limit_alignment_offset(&q->limits,
+ bdev->bd_part->start_sect);
return q->limits.alignment_offset;
}
-static inline int queue_discard_alignment(struct request_queue *q)
+static inline int queue_discard_alignment(const struct request_queue *q)
{
if (q->limits.discard_misaligned)
return -1;
@@ -1588,13 +1540,29 @@
return offset << SECTOR_SHIFT;
}
+/*
+ * Two cases of handling DISCARD merge:
+ * If max_discard_segments > 1, the driver takes every bio
+ * as a range and send them to controller together. The ranges
+ * needn't to be contiguous.
+ * Otherwise, the bios/requests will be handled as same as
+ * others which should be contiguous.
+ */
+static inline bool blk_discard_mergable(struct request *req)
+{
+ if (req_op(req) == REQ_OP_DISCARD &&
+ queue_max_discard_segments(req->q) > 1)
+ return true;
+ return false;
+}
+
static inline int bdev_discard_alignment(struct block_device *bdev)
{
struct request_queue *q = bdev_get_queue(bdev);
- if (bdev != bdev->bd_contains)
- return bdev->bd_part->discard_alignment;
-
+ if (bdev_is_partition(bdev))
+ return queue_limit_discard_alignment(&q->limits,
+ bdev->bd_part->start_sect);
return q->limits.discard_alignment;
}
@@ -1638,7 +1606,7 @@
return false;
}
-static inline unsigned int bdev_zone_sectors(struct block_device *bdev)
+static inline sector_t bdev_zone_sectors(struct block_device *bdev)
{
struct request_queue *q = bdev_get_queue(bdev);
@@ -1647,7 +1615,25 @@
return 0;
}
-static inline int queue_dma_alignment(struct request_queue *q)
+static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
+{
+ struct request_queue *q = bdev_get_queue(bdev);
+
+ if (q)
+ return queue_max_open_zones(q);
+ return 0;
+}
+
+static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
+{
+ struct request_queue *q = bdev_get_queue(bdev);
+
+ if (q)
+ return queue_max_active_zones(q);
+ return 0;
+}
+
+static inline int queue_dma_alignment(const struct request_queue *q)
{
return q ? q->dma_alignment : 511;
}
@@ -1672,113 +1658,10 @@
static inline unsigned int block_size(struct block_device *bdev)
{
- return bdev->bd_block_size;
-}
-
-static inline bool queue_flush_queueable(struct request_queue *q)
-{
- return !test_bit(QUEUE_FLAG_FLUSH_NQ, &q->queue_flags);
-}
-
-typedef struct {struct page *v;} Sector;
-
-unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *);
-
-static inline void put_dev_sector(Sector p)
-{
- put_page(p.v);
-}
-
-static inline bool __bvec_gap_to_prev(struct request_queue *q,
- struct bio_vec *bprv, unsigned int offset)
-{
- return offset ||
- ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
-}
-
-/*
- * Check if adding a bio_vec after bprv with offset would create a gap in
- * the SG list. Most drivers don't care about this, but some do.
- */
-static inline bool bvec_gap_to_prev(struct request_queue *q,
- struct bio_vec *bprv, unsigned int offset)
-{
- if (!queue_virt_boundary(q))
- return false;
- return __bvec_gap_to_prev(q, bprv, offset);
-}
-
-/*
- * Check if the two bvecs from two bios can be merged to one segment.
- * If yes, no need to check gap between the two bios since the 1st bio
- * and the 1st bvec in the 2nd bio can be handled in one segment.
- */
-static inline bool bios_segs_mergeable(struct request_queue *q,
- struct bio *prev, struct bio_vec *prev_last_bv,
- struct bio_vec *next_first_bv)
-{
- if (!BIOVEC_PHYS_MERGEABLE(prev_last_bv, next_first_bv))
- return false;
- if (!BIOVEC_SEG_BOUNDARY(q, prev_last_bv, next_first_bv))
- return false;
- if (prev->bi_seg_back_size + next_first_bv->bv_len >
- queue_max_segment_size(q))
- return false;
- return true;
-}
-
-static inline bool bio_will_gap(struct request_queue *q,
- struct request *prev_rq,
- struct bio *prev,
- struct bio *next)
-{
- if (bio_has_data(prev) && queue_virt_boundary(q)) {
- struct bio_vec pb, nb;
-
- /*
- * don't merge if the 1st bio starts with non-zero
- * offset, otherwise it is quite difficult to respect
- * sg gap limit. We work hard to merge a huge number of small
- * single bios in case of mkfs.
- */
- if (prev_rq)
- bio_get_first_bvec(prev_rq->bio, &pb);
- else
- bio_get_first_bvec(prev, &pb);
- if (pb.bv_offset)
- return true;
-
- /*
- * We don't need to worry about the situation that the
- * merged segment ends in unaligned virt boundary:
- *
- * - if 'pb' ends aligned, the merged segment ends aligned
- * - if 'pb' ends unaligned, the next bio must include
- * one single bvec of 'nb', otherwise the 'nb' can't
- * merge with 'pb'
- */
- bio_get_last_bvec(prev, &pb);
- bio_get_first_bvec(next, &nb);
-
- if (!bios_segs_mergeable(q, prev, &pb, &nb))
- return __bvec_gap_to_prev(q, &pb, nb.bv_offset);
- }
-
- return false;
-}
-
-static inline bool req_gap_back_merge(struct request *req, struct bio *bio)
-{
- return bio_will_gap(req->q, req, req->biotail, bio);
-}
-
-static inline bool req_gap_front_merge(struct request *req, struct bio *bio)
-{
- return bio_will_gap(req->q, NULL, bio, req->bio);
+ return 1 << bdev->bd_inode->i_blkbits;
}
int kblockd_schedule_work(struct work_struct *work);
-int kblockd_schedule_work_on(int cpu, struct work_struct *work);
int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
#define MODULE_ALIAS_BLOCKDEV(major,minor) \
@@ -1805,10 +1688,14 @@
};
typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *);
+typedef void (integrity_prepare_fn) (struct request *);
+typedef void (integrity_complete_fn) (struct request *, unsigned int);
struct blk_integrity_profile {
integrity_processing_fn *generate_fn;
integrity_processing_fn *verify_fn;
+ integrity_prepare_fn *prepare_fn;
+ integrity_complete_fn *complete_fn;
const char *name;
};
@@ -1818,10 +1705,6 @@
extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
struct scatterlist *);
extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
-extern bool blk_integrity_merge_rq(struct request_queue *, struct request *,
- struct request *);
-extern bool blk_integrity_merge_bio(struct request_queue *, struct request *,
- struct bio *);
static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
{
@@ -1839,6 +1722,12 @@
return blk_get_integrity(bdev->bd_disk);
}
+static inline bool
+blk_integrity_queue_supports_integrity(struct request_queue *q)
+{
+ return q->integrity.profile;
+}
+
static inline bool blk_integrity_rq(struct request *rq)
{
return rq->cmd_flags & REQ_INTEGRITY;
@@ -1851,29 +1740,9 @@
}
static inline unsigned short
-queue_max_integrity_segments(struct request_queue *q)
+queue_max_integrity_segments(const struct request_queue *q)
{
return q->limits.max_integrity_segments;
-}
-
-static inline bool integrity_req_gap_back_merge(struct request *req,
- struct bio *next)
-{
- struct bio_integrity_payload *bip = bio_integrity(req->bio);
- struct bio_integrity_payload *bip_next = bio_integrity(next);
-
- return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
- bip_next->bip_vec[0].bv_offset);
-}
-
-static inline bool integrity_req_gap_front_merge(struct request *req,
- struct bio *bio)
-{
- struct bio_integrity_payload *bip = bio_integrity(bio);
- struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
-
- return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
- bip_next->bip_vec[0].bv_offset);
}
/**
@@ -1896,6 +1765,17 @@
unsigned int sectors)
{
return bio_integrity_intervals(bi, sectors) * bi->tuple_size;
+}
+
+/*
+ * Return the first bvec that contains integrity data. Only drivers that are
+ * limited to a single integrity segment should use this helper.
+ */
+static inline struct bio_vec *rq_integrity_vec(struct request *rq)
+{
+ if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1))
+ return NULL;
+ return rq->bio->bi_integrity->bip_vec;
}
#else /* CONFIG_BLK_DEV_INTEGRITY */
@@ -1928,6 +1808,11 @@
{
return NULL;
}
+static inline bool
+blk_integrity_queue_supports_integrity(struct request_queue *q)
+{
+ return false;
+}
static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
{
return 0;
@@ -1943,32 +1828,9 @@
unsigned int segs)
{
}
-static inline unsigned short queue_max_integrity_segments(struct request_queue *q)
+static inline unsigned short queue_max_integrity_segments(const struct request_queue *q)
{
return 0;
-}
-static inline bool blk_integrity_merge_rq(struct request_queue *rq,
- struct request *r1,
- struct request *r2)
-{
- return true;
-}
-static inline bool blk_integrity_merge_bio(struct request_queue *rq,
- struct request *r,
- struct bio *b)
-{
- return true;
-}
-
-static inline bool integrity_req_gap_back_merge(struct request *req,
- struct bio *next)
-{
- return false;
-}
-static inline bool integrity_req_gap_front_merge(struct request *req,
- struct bio *bio)
-{
- return false;
}
static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
@@ -1983,9 +1845,34 @@
return 0;
}
+static inline struct bio_vec *rq_integrity_vec(struct request *rq)
+{
+ return NULL;
+}
+
#endif /* CONFIG_BLK_DEV_INTEGRITY */
+#ifdef CONFIG_BLK_INLINE_ENCRYPTION
+
+bool blk_ksm_register(struct blk_keyslot_manager *ksm, struct request_queue *q);
+
+void blk_ksm_unregister(struct request_queue *q);
+
+#else /* CONFIG_BLK_INLINE_ENCRYPTION */
+
+static inline bool blk_ksm_register(struct blk_keyslot_manager *ksm,
+ struct request_queue *q)
+{
+ return true;
+}
+
+static inline void blk_ksm_unregister(struct request_queue *q) { }
+
+#endif /* CONFIG_BLK_INLINE_ENCRYPTION */
+
+
struct block_device_operations {
+ blk_qc_t (*submit_bio) (struct bio *bio);
int (*open) (struct block_device *, fmode_t);
void (*release) (struct gendisk *, fmode_t);
int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int);
@@ -1993,16 +1880,28 @@
int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
unsigned int (*check_events) (struct gendisk *disk,
unsigned int clearing);
- /* ->media_changed() is DEPRECATED, use ->check_events() instead */
- int (*media_changed) (struct gendisk *);
void (*unlock_native_capacity) (struct gendisk *);
int (*revalidate_disk) (struct gendisk *);
int (*getgeo)(struct block_device *, struct hd_geometry *);
/* this callback is with swap_lock and sometimes page table lock held */
void (*swap_slot_free_notify) (struct block_device *, unsigned long);
+ int (*report_zones)(struct gendisk *, sector_t sector,
+ unsigned int nr_zones, report_zones_cb cb, void *data);
+ char *(*devnode)(struct gendisk *disk, umode_t *mode);
struct module *owner;
const struct pr_ops *pr_ops;
+
+ ANDROID_KABI_RESERVE(1);
+ ANDROID_KABI_RESERVE(2);
+ ANDROID_OEM_DATA(1);
};
+
+#ifdef CONFIG_COMPAT
+extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t,
+ unsigned int, unsigned long);
+#else
+#define blkdev_compat_ptr_ioctl NULL
+#endif
extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
unsigned long);
@@ -2012,6 +1911,7 @@
#ifdef CONFIG_BLK_DEV_ZONED
bool blk_req_needs_zone_write_lock(struct request *rq);
+bool blk_req_zone_write_trylock(struct request *rq);
void __blk_req_zone_write_lock(struct request *rq);
void __blk_req_zone_write_unlock(struct request *rq);
@@ -2063,51 +1963,102 @@
}
#endif /* CONFIG_BLK_DEV_ZONED */
-#else /* CONFIG_BLOCK */
+static inline void blk_wake_io_task(struct task_struct *waiter)
+{
+ /*
+ * If we're polling, the task itself is doing the completions. For
+ * that case, we don't need to signal a wakeup, it's enough to just
+ * mark us as RUNNING.
+ */
+ if (waiter == current)
+ __set_current_state(TASK_RUNNING);
+ else
+ wake_up_process(waiter);
+}
-struct block_device;
+unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors,
+ unsigned int op);
+void disk_end_io_acct(struct gendisk *disk, unsigned int op,
+ unsigned long start_time);
-/*
- * stubs for when the block layer is configured out
+unsigned long part_start_io_acct(struct gendisk *disk, struct hd_struct **part,
+ struct bio *bio);
+void part_end_io_acct(struct hd_struct *part, struct bio *bio,
+ unsigned long start_time);
+
+/**
+ * bio_start_io_acct - start I/O accounting for bio based drivers
+ * @bio: bio to start account for
+ *
+ * Returns the start time that should be passed back to bio_end_io_acct().
*/
-#define buffer_heads_over_limit 0
-
-static inline long nr_blockdev_pages(void)
+static inline unsigned long bio_start_io_acct(struct bio *bio)
{
- return 0;
+ return disk_start_io_acct(bio->bi_disk, bio_sectors(bio), bio_op(bio));
}
-struct blk_plug {
-};
-
-static inline void blk_start_plug(struct blk_plug *plug)
+/**
+ * bio_end_io_acct - end I/O accounting for bio based drivers
+ * @bio: bio to end account for
+ * @start: start time returned by bio_start_io_acct()
+ */
+static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
{
+ return disk_end_io_acct(bio->bi_disk, bio_op(bio), start_time);
}
-static inline void blk_finish_plug(struct blk_plug *plug)
-{
-}
+int bdev_read_only(struct block_device *bdev);
+int set_blocksize(struct block_device *bdev, int size);
-static inline void blk_flush_plug(struct task_struct *task)
-{
-}
+const char *bdevname(struct block_device *bdev, char *buffer);
+struct block_device *lookup_bdev(const char *);
-static inline void blk_schedule_flush_plug(struct task_struct *task)
-{
-}
+void blkdev_show(struct seq_file *seqf, off_t offset);
-
-static inline bool blk_needs_flush_plug(struct task_struct *tsk)
-{
- return false;
-}
-
-static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
- sector_t *error_sector)
-{
- return 0;
-}
-
-#endif /* CONFIG_BLOCK */
-
+#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
+#define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
+#ifdef CONFIG_BLOCK
+#define BLKDEV_MAJOR_MAX 512
+#else
+#define BLKDEV_MAJOR_MAX 0
#endif
+
+struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
+ void *holder);
+struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder);
+int bd_prepare_to_claim(struct block_device *bdev, struct block_device *whole,
+ void *holder);
+void bd_abort_claiming(struct block_device *bdev, struct block_device *whole,
+ void *holder);
+void blkdev_put(struct block_device *bdev, fmode_t mode);
+
+struct block_device *I_BDEV(struct inode *inode);
+struct block_device *bdget_part(struct hd_struct *part);
+struct block_device *bdgrab(struct block_device *bdev);
+void bdput(struct block_device *);
+
+#ifdef CONFIG_BLOCK
+void invalidate_bdev(struct block_device *bdev);
+int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart,
+ loff_t lend);
+int sync_blockdev(struct block_device *bdev);
+#else
+static inline void invalidate_bdev(struct block_device *bdev)
+{
+}
+static inline int truncate_bdev_range(struct block_device *bdev, fmode_t mode,
+ loff_t lstart, loff_t lend)
+{
+ return 0;
+}
+static inline int sync_blockdev(struct block_device *bdev)
+{
+ return 0;
+}
+#endif
+int fsync_bdev(struct block_device *bdev);
+
+int freeze_bdev(struct block_device *bdev);
+int thaw_bdev(struct block_device *bdev);
+
+#endif /* _LINUX_BLKDEV_H */
--
Gitblit v1.6.2