forked from Minki/linux
scsi: sd_zbc: Fix comments and indentation
Fix comments style (use kernel-doc style) and content to clarify some functions. Also fix some functions signature indentation and remove a useless blank line in sd_zbc_read_zones(). No functional change is introduced by this patch. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Damien Le Moal
Martin K. Petersen
parent
aa8a845662
commit
e98f42bcad
@ -1752,7 +1752,10 @@ static void scsi_done(struct scsi_cmnd *cmd)
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*
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* Returns: Nothing
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*
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* Lock status: IO request lock assumed to be held when called.
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* Lock status: request queue lock assumed to be held when called.
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*
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* Note: See sd_zbc.c sd_zbc_write_lock_zone() for write order
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* protection for ZBC disks.
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*/
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static void scsi_request_fn(struct request_queue *q)
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__releases(q->queue_lock)
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@ -32,10 +32,14 @@
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#include "sd.h"
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/**
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* Convert a zone descriptor to a zone struct.
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* sd_zbc_parse_report - Convert a zone descriptor to a struct blk_zone,
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* @sdkp: The disk the report originated from
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* @buf: Address of the report zone descriptor
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* @zone: the destination zone structure
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*
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* All LBA sized values are converted to 512B sectors unit.
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*/
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static void sd_zbc_parse_report(struct scsi_disk *sdkp,
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u8 *buf,
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static void sd_zbc_parse_report(struct scsi_disk *sdkp, u8 *buf,
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struct blk_zone *zone)
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{
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struct scsi_device *sdp = sdkp->device;
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@ -58,7 +62,13 @@ static void sd_zbc_parse_report(struct scsi_disk *sdkp,
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}
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/**
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* Issue a REPORT ZONES scsi command.
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* sd_zbc_report_zones - Issue a REPORT ZONES scsi command.
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* @sdkp: The target disk
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* @buf: Buffer to use for the reply
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* @buflen: the buffer size
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* @lba: Start LBA of the report
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*
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* For internal use during device validation.
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*/
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static int sd_zbc_report_zones(struct scsi_disk *sdkp, unsigned char *buf,
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unsigned int buflen, sector_t lba)
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@ -99,6 +109,12 @@ static int sd_zbc_report_zones(struct scsi_disk *sdkp, unsigned char *buf,
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return 0;
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}
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/**
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* sd_zbc_setup_report_cmnd - Prepare a REPORT ZONES scsi command
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* @cmd: The command to setup
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*
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* Call in sd_init_command() for a REQ_OP_ZONE_REPORT request.
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*/
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int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd)
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{
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struct request *rq = cmd->request;
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@ -141,6 +157,14 @@ int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd)
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return BLKPREP_OK;
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}
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/**
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* sd_zbc_report_zones_complete - Process a REPORT ZONES scsi command reply.
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* @scmd: The completed report zones command
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* @good_bytes: reply size in bytes
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*
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* Convert all reported zone descriptors to struct blk_zone. The conversion
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* is done in-place, directly in the request specified sg buffer.
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*/
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static void sd_zbc_report_zones_complete(struct scsi_cmnd *scmd,
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unsigned int good_bytes)
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{
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@ -196,17 +220,32 @@ static void sd_zbc_report_zones_complete(struct scsi_cmnd *scmd,
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local_irq_restore(flags);
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}
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/**
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* sd_zbc_zone_sectors - Get the device zone size in number of 512B sectors.
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* @sdkp: The target disk
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*/
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static inline sector_t sd_zbc_zone_sectors(struct scsi_disk *sdkp)
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{
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return logical_to_sectors(sdkp->device, sdkp->zone_blocks);
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}
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/**
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* sd_zbc_zone_no - Get the number of the zone conataining a sector.
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* @sdkp: The target disk
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* @sector: 512B sector address contained in the zone
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*/
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static inline unsigned int sd_zbc_zone_no(struct scsi_disk *sdkp,
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sector_t sector)
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{
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return sectors_to_logical(sdkp->device, sector) >> sdkp->zone_shift;
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}
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/**
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* sd_zbc_setup_reset_cmnd - Prepare a RESET WRITE POINTER scsi command.
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* @cmd: the command to setup
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*
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* Called from sd_init_command() for a REQ_OP_ZONE_RESET request.
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*/
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int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
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{
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struct request *rq = cmd->request;
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@ -239,6 +278,23 @@ int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
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return BLKPREP_OK;
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}
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/**
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* sd_zbc_write_lock_zone - Write lock a sequential zone.
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* @cmd: write command
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*
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* Called from sd_init_cmd() for write requests (standard write, write same or
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* write zeroes operations). If the request target zone is not already locked,
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* the zone is locked and BLKPREP_OK returned, allowing the request to proceed
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* through dispatch in scsi_request_fn(). Otherwise, BLKPREP_DEFER is returned,
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* forcing the request to wait for the zone to be unlocked, that is, for the
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* previously issued write request targeting the same zone to complete.
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*
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* This is called from blk_peek_request() context with the queue lock held and
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* before the request is removed from the scheduler. As a result, multiple
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* contexts executing concurrently scsi_request_fn() cannot result in write
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* sequence reordering as only a single write request per zone is allowed to
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* proceed.
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*/
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int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd)
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{
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struct request *rq = cmd->request;
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@ -261,10 +317,7 @@ int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd)
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* Do not issue more than one write at a time per
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* zone. This solves write ordering problems due to
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* the unlocking of the request queue in the dispatch
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* path in the non scsi-mq case. For scsi-mq, this
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* also avoids potential write reordering when multiple
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* threads running on different CPUs write to the same
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* zone (with a synchronized sequential pattern).
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* path in the non scsi-mq case.
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*/
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if (sdkp->zones_wlock &&
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test_and_set_bit(zno, sdkp->zones_wlock))
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@ -276,6 +329,13 @@ int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd)
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return BLKPREP_OK;
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}
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/**
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* sd_zbc_write_unlock_zone - Write unlock a sequential zone.
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* @cmd: write command
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*
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* Called from sd_uninit_cmd(). Unlocking the request target zone will allow
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* dispatching the next write request for the zone.
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*/
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void sd_zbc_write_unlock_zone(struct scsi_cmnd *cmd)
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{
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struct request *rq = cmd->request;
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@ -290,8 +350,16 @@ void sd_zbc_write_unlock_zone(struct scsi_cmnd *cmd)
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}
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}
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void sd_zbc_complete(struct scsi_cmnd *cmd,
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unsigned int good_bytes,
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/**
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* sd_zbc_complete - ZBC command post processing.
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* @cmd: Completed command
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* @good_bytes: Command reply bytes
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* @sshdr: command sense header
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*
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* Called from sd_done(). Process report zones reply and handle reset zone
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* and write commands errors.
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*/
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void sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
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struct scsi_sense_hdr *sshdr)
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{
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int result = cmd->result;
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@ -336,7 +404,11 @@ void sd_zbc_complete(struct scsi_cmnd *cmd,
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}
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/**
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* Read zoned block device characteristics (VPD page B6).
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* sd_zbc_read_zoned_characteristics - Read zoned block device characteristics
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* @sdkp: Target disk
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* @buf: Buffer where to store the VPD page data
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*
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* Read VPD page B6.
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*/
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static int sd_zbc_read_zoned_characteristics(struct scsi_disk *sdkp,
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unsigned char *buf)
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@ -366,10 +438,16 @@ static int sd_zbc_read_zoned_characteristics(struct scsi_disk *sdkp,
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}
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/**
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* Check reported capacity.
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* sd_zbc_check_capacity - Check reported capacity.
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* @sdkp: Target disk
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* @buf: Buffer to use for commands
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*
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* ZBC drive may report only the capacity of the first conventional zones at
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* LBA 0. This is indicated by the RC_BASIS field of the read capacity reply.
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* Check this here. If the disk reported only its conventional zones capacity,
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* get the total capacity by doing a report zones.
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*/
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static int sd_zbc_check_capacity(struct scsi_disk *sdkp,
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unsigned char *buf)
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static int sd_zbc_check_capacity(struct scsi_disk *sdkp, unsigned char *buf)
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{
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sector_t lba;
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int ret;
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@ -399,6 +477,13 @@ static int sd_zbc_check_capacity(struct scsi_disk *sdkp,
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#define SD_ZBC_BUF_SIZE 131072
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/**
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* sd_zbc_check_zone_size - Check the device zone sizes
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* @sdkp: Target disk
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*
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* Check that all zones of the device are equal. The last zone can however
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* be smaller. The zone size must also be a power of two number of LBAs.
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*/
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static int sd_zbc_check_zone_size(struct scsi_disk *sdkp)
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{
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u64 zone_blocks;
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@ -525,8 +610,7 @@ static int sd_zbc_setup(struct scsi_disk *sdkp)
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return 0;
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}
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int sd_zbc_read_zones(struct scsi_disk *sdkp,
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unsigned char *buf)
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int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf)
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{
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int ret;
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@ -537,7 +621,6 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp,
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*/
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return 0;
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/* Get zoned block device characteristics */
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ret = sd_zbc_read_zoned_characteristics(sdkp, buf);
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if (ret)
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