From 60101509ee73c6e61e50c0a4079097f31bb39f4b Mon Sep 17 00:00:00 2001 From: Brian Behlendorf Date: Thu, 26 Aug 2010 11:45:02 -0700 Subject: [PATCH] Add linux kernel disk support Native Linux vdev disk interfaces Signed-off-by: Brian Behlendorf --- module/zcommon/include/sys/fs/zfs.h | 14 +- module/zcommon/zfs_namecheck.c | 29 +- module/zfs/Makefile.in | 1 + module/zfs/dmu.c | 131 ++-- module/zfs/include/sys/blkdev.h | 211 ++++++ module/zfs/include/sys/dmu.h | 16 +- module/zfs/include/sys/spa_impl.h | 2 +- module/zfs/include/sys/vdev_disk.h | 97 +++ module/zfs/include/sys/zfs_fuid.h | 3 + module/zfs/include/sys/zfs_ioctl.h | 1 - module/zfs/include/sys/zfs_znode.h | 2 + module/zfs/include/sys/zvol.h | 41 +- module/zfs/rrwlock.c | 3 + module/zfs/spa_misc.c | 6 - module/zfs/vdev.c | 10 + module/zfs/vdev_disk.c | 654 +++++++++++++++++ module/zfs/zfs_acl.c | 4 + module/zfs/zfs_ctldir.c | 3 + module/zfs/zfs_dir.c | 3 + module/zfs/zfs_fuid.c | 2 + module/zfs/zfs_ioctl.c | 34 +- module/zfs/zfs_log.c | 4 + module/zfs/zfs_replay.c | 3 + module/zfs/zfs_vfsops.c | 16 +- module/zfs/zfs_vnops.c | 5 + module/zfs/zfs_znode.c | 51 +- module/zfs/zvol.c | 1337 +++++++++++++++++++++++++++++++++++ 27 files changed, 2571 insertions(+), 112 deletions(-) create mode 100644 module/zfs/include/sys/blkdev.h create mode 100644 module/zfs/include/sys/vdev_disk.h create mode 100644 module/zfs/vdev_disk.c create mode 100644 module/zfs/zvol.c diff --git a/module/zcommon/include/sys/fs/zfs.h b/module/zcommon/include/sys/fs/zfs.h index b2c9469..25f2562 100644 --- a/module/zcommon/include/sys/fs/zfs.h +++ b/module/zcommon/include/sys/fs/zfs.h @@ -701,12 +701,12 @@ typedef struct ddt_histogram { #define ZFS_DEV "/dev/zfs" /* general zvol path */ -#define ZVOL_DIR "/dev/zvol" -/* expansion */ -#define ZVOL_PSEUDO_DEV "/devices/pseudo/zfs@0:" -/* for dump and swap */ -#define ZVOL_FULL_DEV_DIR ZVOL_DIR "/dsk/" -#define ZVOL_FULL_RDEV_DIR ZVOL_DIR "/rdsk/" +#define ZVOL_DIR "/dev" + +#define ZVOL_MAJOR 230 +#define ZVOL_MINOR_BITS 4 +#define ZVOL_MINOR_MASK ((1U << ZVOL_MINOR_BITS) - 1) +#define ZVOL_MINORS (1 << 4) #define ZVOL_PROP_NAME "name" #define ZVOL_DEFAULT_BLOCKSIZE 8192 @@ -740,6 +740,8 @@ typedef enum zfs_ioc { ZFS_IOC_DATASET_LIST_NEXT, ZFS_IOC_SNAPSHOT_LIST_NEXT, ZFS_IOC_SET_PROP, + ZFS_IOC_CREATE_MINOR, + ZFS_IOC_REMOVE_MINOR, ZFS_IOC_CREATE, ZFS_IOC_DESTROY, ZFS_IOC_ROLLBACK, diff --git a/module/zcommon/zfs_namecheck.c b/module/zcommon/zfs_namecheck.c index 5cfafea..2398c27 100644 --- a/module/zcommon/zfs_namecheck.c +++ b/module/zcommon/zfs_namecheck.c @@ -142,9 +142,22 @@ dataset_namecheck(const char *path, namecheck_err_t *why, char *what) * which is the same as MAXNAMELEN used in the kernel. * If ZFS_MAXNAMELEN value is changed, make sure to cleanup all * places using MAXNAMELEN. + * + * When HAVE_KOBJ_NAME_LEN is defined the maximum safe kobject name + * length is 20 bytes. This 20 bytes is broken down as follows to + * provide a maximum safe /[@snapshot] length of only + * 18 bytes. To ensure bytes are left for [@snapshot] the + * portition is futher limited to 9 bytes. For 2.6.27 and + * newer kernels this limit is set to MAXNAMELEN. + * + * / + + + * (18) + (1) + (1) */ - +#ifdef HAVE_KOBJ_NAME_LEN + if (strlen(path) > 18) { +#else if (strlen(path) >= MAXNAMELEN) { +#endif /* HAVE_KOBJ_NAME_LEN */ if (why) *why = NAME_ERR_TOOLONG; return (-1); @@ -303,8 +316,22 @@ pool_namecheck(const char *pool, namecheck_err_t *why, char *what) * which is the same as MAXNAMELEN used in the kernel. * If ZPOOL_MAXNAMELEN value is changed, make sure to cleanup all * places using MAXNAMELEN. + * + * When HAVE_KOBJ_NAME_LEN is defined the maximum safe kobject name + * length is 20 bytes. This 20 bytes is broken down as follows to + * provide a maximum safe /[@snapshot] length of only + * 18 bytes. To ensure bytes are left for [@snapshot] the + * portition is futher limited to 8 bytes. For 2.6.27 and + * newer kernels this limit is set to MAXNAMELEN. + * + * / + + + * (18) + (1) + (1) */ +#ifdef HAVE_KOBJ_NAME_LEN + if (strlen(pool) > 8) { +#else if (strlen(pool) >= MAXNAMELEN) { +#endif /* HAVE_KOBJ_NAME_LEN */ if (why) *why = NAME_ERR_TOOLONG; return (-1); diff --git a/module/zfs/Makefile.in b/module/zfs/Makefile.in index b9effcb..ef2e562 100644 --- a/module/zfs/Makefile.in +++ b/module/zfs/Makefile.in @@ -53,6 +53,7 @@ ${MODULE}-objs += uberblock.o ${MODULE}-objs += unique.o ${MODULE}-objs += vdev.o ${MODULE}-objs += vdev_cache.o +${MODULE}-objs += vdev_disk.o ${MODULE}-objs += vdev_file.o ${MODULE}-objs += vdev_label.o ${MODULE}-objs += vdev_mirror.o diff --git a/module/zfs/dmu.c b/module/zfs/dmu.c index 7f17c73..fea9cd5 100644 --- a/module/zfs/dmu.c +++ b/module/zfs/dmu.c @@ -793,7 +793,7 @@ dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, else dmu_buf_will_dirty(db, tx); - bcopy(buf, (char *)db->db_data + bufoff, tocpy); + (void) memcpy((char *)db->db_data + bufoff, buf, tocpy); if (tocpy == db->db_size) dmu_buf_fill_done(db, tx); @@ -975,85 +975,126 @@ xuio_stat_wbuf_nocopy() } #ifdef _KERNEL + +/* + * Copy up to size bytes between arg_buf and req based on the data direction + * described by the req. If an entire req's data cannot be transfered the + * req's is updated such that it's current index and bv offsets correctly + * reference any residual data which could not be copied. The return value + * is the number of bytes successfully copied to arg_buf. + */ +static int +dmu_req_copy(void *arg_buf, int size, int *offset, struct request *req) +{ + struct bio_vec *bv; + struct req_iterator iter; + char *bv_buf; + int tocpy; + + *offset = 0; + rq_for_each_segment(bv, req, iter) { + + /* Fully consumed the passed arg_buf */ + ASSERT3S(*offset, <=, size); + if (size == *offset) + break; + + /* Skip fully consumed bv's */ + if (bv->bv_len == 0) + continue; + + tocpy = MIN(bv->bv_len, size - *offset); + ASSERT3S(tocpy, >=, 0); + + bv_buf = page_address(bv->bv_page) + bv->bv_offset; + ASSERT3P(bv_buf, !=, NULL); + + if (rq_data_dir(req) == WRITE) + memcpy(arg_buf + *offset, bv_buf, tocpy); + else + memcpy(bv_buf, arg_buf + *offset, tocpy); + + *offset += tocpy; + bv->bv_offset += tocpy; + bv->bv_len -= tocpy; + } + + return 0; +} + int -dmu_read_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size) +dmu_read_req(objset_t *os, uint64_t object, struct request *req) { + uint64_t size = blk_rq_bytes(req); + uint64_t offset = blk_rq_pos(req) << 9; dmu_buf_t **dbp; int numbufs, i, err; - xuio_t *xuio = NULL; /* * NB: we could do this block-at-a-time, but it's nice * to be reading in parallel. */ - err = dmu_buf_hold_array(os, object, uio->uio_loffset, size, TRUE, FTAG, - &numbufs, &dbp); + err = dmu_buf_hold_array(os, object, offset, size, TRUE, FTAG, + &numbufs, &dbp); if (err) return (err); - if (uio->uio_extflg == UIO_XUIO) - xuio = (xuio_t *)uio; - for (i = 0; i < numbufs; i++) { - int tocpy; - int bufoff; + int tocpy, didcpy, bufoff; dmu_buf_t *db = dbp[i]; - ASSERT(size > 0); + bufoff = offset - db->db_offset; + ASSERT3S(bufoff, >=, 0); - bufoff = uio->uio_loffset - db->db_offset; tocpy = (int)MIN(db->db_size - bufoff, size); + if (tocpy == 0) + break; - if (xuio) { - dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; - arc_buf_t *dbuf_abuf = dbi->db_buf; - arc_buf_t *abuf = dbuf_loan_arcbuf(dbi); - err = dmu_xuio_add(xuio, abuf, bufoff, tocpy); - if (!err) { - uio->uio_resid -= tocpy; - uio->uio_loffset += tocpy; - } + err = dmu_req_copy(db->db_data + bufoff, tocpy, &didcpy, req); + + if (didcpy < tocpy) + err = EIO; - if (abuf == dbuf_abuf) - XUIOSTAT_BUMP(xuiostat_rbuf_nocopy); - else - XUIOSTAT_BUMP(xuiostat_rbuf_copied); - } else { - err = uiomove((char *)db->db_data + bufoff, tocpy, - UIO_READ, uio); - } if (err) break; size -= tocpy; + offset += didcpy; + err = 0; } dmu_buf_rele_array(dbp, numbufs, FTAG); return (err); } -static int -dmu_write_uio_dnode(dnode_t *dn, uio_t *uio, uint64_t size, dmu_tx_t *tx) +int +dmu_write_req(objset_t *os, uint64_t object, struct request *req, dmu_tx_t *tx) { + uint64_t size = blk_rq_bytes(req); + uint64_t offset = blk_rq_pos(req) << 9; dmu_buf_t **dbp; int numbufs; int err = 0; int i; - err = dmu_buf_hold_array_by_dnode(dn, uio->uio_loffset, size, - FALSE, FTAG, &numbufs, &dbp, DMU_READ_PREFETCH); + if (size == 0) + return (0); + + err = dmu_buf_hold_array(os, object, offset, size, FALSE, FTAG, + &numbufs, &dbp); if (err) return (err); for (i = 0; i < numbufs; i++) { - int tocpy; - int bufoff; + int tocpy, didcpy, bufoff; dmu_buf_t *db = dbp[i]; - ASSERT(size > 0); + bufoff = offset - db->db_offset; + ASSERT3S(bufoff, >=, 0); - bufoff = uio->uio_loffset - db->db_offset; tocpy = (int)MIN(db->db_size - bufoff, size); + if (tocpy == 0) + break; ASSERT(i == 0 || i == numbufs-1 || tocpy == db->db_size); @@ -1062,28 +1103,28 @@ dmu_write_uio_dnode(dnode_t *dn, uio_t *uio, uint64_t size, dmu_tx_t *tx) else dmu_buf_will_dirty(db, tx); - /* - * XXX uiomove could block forever (eg. nfs-backed - * pages). There needs to be a uiolockdown() function - * to lock the pages in memory, so that uiomove won't - * block. - */ - err = uiomove((char *)db->db_data + bufoff, tocpy, - UIO_WRITE, uio); + err = dmu_req_copy(db->db_data + bufoff, tocpy, &didcpy, req); if (tocpy == db->db_size) dmu_buf_fill_done(db, tx); + if (didcpy < tocpy) + err = EIO; + if (err) break; size -= tocpy; + offset += didcpy; + err = 0; } dmu_buf_rele_array(dbp, numbufs, FTAG); return (err); } +#endif +#ifdef HAVE_ZPL int dmu_write_uio_dbuf(dmu_buf_t *zdb, uio_t *uio, uint64_t size, dmu_tx_t *tx) diff --git a/module/zfs/include/sys/blkdev.h b/module/zfs/include/sys/blkdev.h new file mode 100644 index 0000000..b84f66a --- /dev/null +++ b/module/zfs/include/sys/blkdev.h @@ -0,0 +1,211 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright (C) 2008-2010 Lawrence Livermore National Security, LLC. + * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER). + * Written by Brian Behlendorf . + * LLNL-CODE-403049. + */ + +#ifndef _SYS_BLKDEV_H +#define _SYS_BLKDEV_H + +#ifdef _KERNEL + +#include +#include + +#ifndef HAVE_FMODE_T +typedef unsigned __bitwise__ fmode_t; +#endif /* HAVE_FMODE_T */ + +#ifndef HAVE_BLK_FETCH_REQUEST +static inline struct request * +blk_fetch_request(struct request_queue *q) +{ + struct request *req; + + req = elv_next_request(q); + if (req) + blkdev_dequeue_request(req); + + return req; +} +#endif /* HAVE_BLK_FETCH_REQUEST */ + +#ifndef HAVE_BLK_REQUEUE_REQUEST +static inline void +blk_requeue_request(request_queue_t *q, struct request *req) +{ + elv_requeue_request(q, req); +} +#endif /* HAVE_BLK_REQUEUE_REQUEST */ + +#ifndef HAVE_BLK_END_REQUEST +static inline bool +__blk_end_request(struct request *req, int error, unsigned int nr_bytes) +{ + LIST_HEAD(list); + + /* + * Request has already been dequeued but 2.6.18 version of + * end_request() unconditionally dequeues the request so we + * add it to a local list to prevent hitting the BUG_ON. + */ + list_add(&req->queuelist, &list); + + /* + * The old API required the driver to end each segment and not + * the entire request. In our case we always need to end the + * entire request partial requests are not supported. + */ + req->hard_cur_sectors = nr_bytes >> 9; + end_request(req, ((error == 0) ? 1 : error)); + + return 0; +} + +static inline bool +blk_end_request(struct request *req, int error, unsigned int nr_bytes) +{ + struct request_queue *q = req->q; + bool rc; + + spin_lock_irq(q->queue_lock); + rc = __blk_end_request(req, error, nr_bytes); + spin_unlock_irq(q->queue_lock); + + return rc; +} +#else +# ifdef HAVE_BLK_END_REQUEST_GPL_ONLY +/* + * Define required to avoid conflicting 2.6.29 non-static prototype for a + * GPL-only version of the helper. As of 2.6.31 the helper is available + * to non-GPL modules and is not explicitly exported GPL-only. + */ +# define __blk_end_request __blk_end_request_x +# define blk_end_request blk_end_request_x + +static inline bool +__blk_end_request_x(struct request *req, int error, unsigned int nr_bytes) +{ + /* + * The old API required the driver to end each segment and not + * the entire request. In our case we always need to end the + * entire request partial requests are not supported. + */ + req->hard_cur_sectors = nr_bytes >> 9; + end_request(req, ((error == 0) ? 1 : error)); + + return 0; +} +static inline bool +blk_end_request_x(struct request *req, int error, unsigned int nr_bytes) +{ + struct request_queue *q = req->q; + bool rc; + + spin_lock_irq(q->queue_lock); + rc = __blk_end_request_x(req, error, nr_bytes); + spin_unlock_irq(q->queue_lock); + + return rc; +} +# endif /* HAVE_BLK_END_REQUEST_GPL_ONLY */ +#endif /* HAVE_BLK_END_REQUEST */ + +#ifndef HAVE_BLK_RQ_POS +static inline sector_t +blk_rq_pos(struct request *req) +{ + return req->sector; +} +#endif /* HAVE_BLK_RQ_POS */ + +#ifndef HAVE_BLK_RQ_SECTORS +static inline unsigned int +blk_rq_sectors(struct request *req) +{ + return req->nr_sectors; +} +#endif /* HAVE_BLK_RQ_SECTORS */ + +#if !defined(HAVE_BLK_RQ_BYTES) || defined(HAVE_BLK_RQ_BYTES_GPL_ONLY) +/* + * Define required to avoid conflicting 2.6.29 non-static prototype for a + * GPL-only version of the helper. As of 2.6.31 the helper is available + * to non-GPL modules in the form of a static inline in the header. + */ +#define blk_rq_bytes __blk_rq_bytes +static inline unsigned int +__blk_rq_bytes(struct request *req) +{ + return blk_rq_sectors(req) << 9; +} +#endif /* !HAVE_BLK_RQ_BYTES || HAVE_BLK_RQ_BYTES_GPL_ONLY */ + +#ifndef HAVE_GET_DISK_RO +static inline int +get_disk_ro(struct gendisk *disk) +{ + int policy = 0; + + if (disk->part[0]) + policy = disk->part[0]->policy; + + return policy; +} +#endif /* HAVE_GET_DISK_RO */ + +#ifndef HAVE_RQ_IS_SYNC +static inline bool +rq_is_sync(struct request *req) +{ + return (req->flags & REQ_RW_SYNC); +} +#endif /* HAVE_RQ_IS_SYNC */ + +#ifndef HAVE_RQ_FOR_EACH_SEGMENT +struct req_iterator { + int i; + struct bio *bio; +}; + +# define for_each_bio(_bio) \ + for (; _bio; _bio = _bio->bi_next) + +# define __rq_for_each_bio(_bio, rq) \ + if ((rq->bio)) \ + for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) + +# define rq_for_each_segment(bvl, _rq, _iter) \ + __rq_for_each_bio(_iter.bio, _rq) \ + bio_for_each_segment(bvl, _iter.bio, _iter.i) +#endif /* HAVE_RQ_FOR_EACH_SEGMENT */ + +#ifndef DISK_NAME_LEN +#define DISK_NAME_LEN 32 +#endif /* DISK_NAME_LEN */ + +#endif /* KERNEL */ + +#endif /* _SYS_BLKDEV_H */ diff --git a/module/zfs/include/sys/dmu.h b/module/zfs/include/sys/dmu.h index ad41276..575cb2d 100644 --- a/module/zfs/include/sys/dmu.h +++ b/module/zfs/include/sys/dmu.h @@ -41,13 +41,14 @@ #include #include #include +#ifdef _KERNEL +#include +#endif #ifdef __cplusplus extern "C" { #endif -struct uio; -struct xuio; struct page; struct vnode; struct spa; @@ -512,13 +513,14 @@ void dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, const void *buf, dmu_tx_t *tx); void dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, dmu_tx_t *tx); -int dmu_read_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size); -int dmu_write_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size, - dmu_tx_t *tx); -int dmu_write_uio_dbuf(dmu_buf_t *zdb, struct uio *uio, uint64_t size, - dmu_tx_t *tx); +#ifdef _KERNEL +int dmu_read_req(objset_t *os, uint64_t object, struct request *req); +int dmu_write_req(objset_t *os, uint64_t object, struct request *req, dmu_tx_t *tx); +#endif +#ifdef HAVE_ZPL int dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, struct page *pp, dmu_tx_t *tx); +#endif struct arc_buf *dmu_request_arcbuf(dmu_buf_t *handle, int size); void dmu_return_arcbuf(struct arc_buf *buf); void dmu_assign_arcbuf(dmu_buf_t *handle, uint64_t offset, struct arc_buf *buf, diff --git a/module/zfs/include/sys/spa_impl.h b/module/zfs/include/sys/spa_impl.h index c965ffb..8cab669 100644 --- a/module/zfs/include/sys/spa_impl.h +++ b/module/zfs/include/sys/spa_impl.h @@ -210,7 +210,7 @@ struct spa { kmutex_t spa_proc_lock; /* protects spa_proc* */ kcondvar_t spa_proc_cv; /* spa_proc_state transitions */ spa_proc_state_t spa_proc_state; /* see definition */ - struct proc *spa_proc; /* "zpool-poolname" process */ + proc_t *spa_proc; /* "zpool-poolname" process */ uint64_t spa_did; /* if procp != p0, did of t1 */ boolean_t spa_autoreplace; /* autoreplace set in open */ int spa_vdev_locks; /* locks grabbed */ diff --git a/module/zfs/include/sys/vdev_disk.h b/module/zfs/include/sys/vdev_disk.h new file mode 100644 index 0000000..986c336 --- /dev/null +++ b/module/zfs/include/sys/vdev_disk.h @@ -0,0 +1,97 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright (C) 2008-2010 Lawrence Livermore National Security, LLC. + * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER). + * Written by Brian Behlendorf . + * LLNL-CODE-403049. + */ + +#ifndef _SYS_VDEV_DISK_H +#define _SYS_VDEV_DISK_H + +#ifdef __cplusplus +extern "C" { +#endif + +#ifdef _KERNEL +#include +#include +#include +#include + +typedef struct vdev_disk { + ddi_devid_t vd_devid; + char *vd_minor; + struct block_device *vd_bdev; +} vdev_disk_t; + +extern int vdev_disk_physio(struct block_device *, caddr_t, + size_t, uint64_t, int); +extern int vdev_disk_read_rootlabel(char *, char *, nvlist_t **); + +/* 2.6.24 API change */ +#ifdef HAVE_2ARGS_BIO_END_IO_T +# define BIO_END_IO_PROTO(fn, x, y, z) static void fn(struct bio *x, int z) +# define BIO_END_IO_RETURN(rc) return +#else +# define BIO_END_IO_PROTO(fn, x, y, z) static int fn(struct bio *x, \ + unsigned int y, int z) +# define BIO_END_IO_RETURN(rc) return rc +#endif /* HAVE_2ARGS_BIO_END_IO_T */ + +/* 2.6.29 API change */ +#ifdef HAVE_BIO_RW_SYNCIO +# define DIO_RW_SYNCIO BIO_RW_SYNCIO +#else +# define DIO_RW_SYNCIO BIO_RW_SYNC +#endif /* HAVE_BIO_RW_SYNCIO */ + +/* 2.6.28 API change */ +#ifdef HAVE_OPEN_BDEV_EXCLUSIVE +# define vdev_bdev_open(path, md, hld) open_bdev_exclusive(path, md, hld) +# define vdev_bdev_close(bdev, md) close_bdev_exclusive(bdev, md) +#else +# define vdev_bdev_open(path, md, hld) open_bdev_excl(path, md, hld) +# define vdev_bdev_close(bdev, md) close_bdev_excl(bdev) +#endif /* HAVE_OPEN_BDEV_EXCLUSIVE */ + +/* 2.6.22 API change */ +#ifdef HAVE_1ARG_INVALIDATE_BDEV +# define vdev_bdev_invalidate(bdev) invalidate_bdev(bdev) +#else +# define vdev_bdev_invalidate(bdev) invalidate_bdev(bdev, 1) +#endif /* HAVE_1ARG_INVALIDATE_BDEV */ + +/* 2.6.30 API change */ +#ifdef HAVE_BDEV_LOGICAL_BLOCK_SIZE +# define vdev_bdev_block_size(bdev) bdev_logical_block_size(bdev) +#else +# define vdev_bdev_block_size(bdev) bdev_hardsect_size(bdev) +#endif + +#endif /* _KERNEL */ + +#ifdef __cplusplus +} +#endif + +#endif /* _SYS_VDEV_DISK_H */ diff --git a/module/zfs/include/sys/zfs_fuid.h b/module/zfs/include/sys/zfs_fuid.h index 0feb3ce..d2989c8 100644 --- a/module/zfs/include/sys/zfs_fuid.h +++ b/module/zfs/include/sys/zfs_fuid.h @@ -33,6 +33,7 @@ #include #endif #include +#include #ifdef __cplusplus extern "C" { @@ -98,6 +99,7 @@ typedef struct zfs_fuid_info { } zfs_fuid_info_t; #ifdef _KERNEL +#ifdef HAVE_ZPL struct znode; extern uid_t zfs_fuid_map_id(zfsvfs_t *, uint64_t, cred_t *, zfs_fuid_type_t); extern void zfs_fuid_node_add(zfs_fuid_info_t **, const char *, uint32_t, @@ -117,6 +119,7 @@ extern int zfs_fuid_find_by_domain(zfsvfs_t *, const char *domain, char **retdomain, boolean_t addok); extern const char *zfs_fuid_find_by_idx(zfsvfs_t *zfsvfs, uint32_t idx); extern void zfs_fuid_txhold(zfsvfs_t *zfsvfs, dmu_tx_t *tx); +#endif /* HAVE_ZPL */ #endif char *zfs_fuid_idx_domain(avl_tree_t *, uint32_t); diff --git a/module/zfs/include/sys/zfs_ioctl.h b/module/zfs/include/sys/zfs_ioctl.h index 4a21cc8..e3fd2c3 100644 --- a/module/zfs/include/sys/zfs_ioctl.h +++ b/module/zfs/include/sys/zfs_ioctl.h @@ -316,7 +316,6 @@ extern int zfs_secpolicy_snapshot_perms(const char *name, cred_t *cr); extern int zfs_secpolicy_rename_perms(const char *from, const char *to, cred_t *cr); extern int zfs_secpolicy_destroy_perms(const char *name, cred_t *cr); -extern int zfs_busy(void); extern int zfs_unmount_snap(const char *, void *); enum zfsdev_state_type { diff --git a/module/zfs/include/sys/zfs_znode.h b/module/zfs/include/sys/zfs_znode.h index 9d4b913..b2477ed 100644 --- a/module/zfs/include/sys/zfs_znode.h +++ b/module/zfs/include/sys/zfs_znode.h @@ -343,8 +343,10 @@ extern void zfs_xvattr_set(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx); extern void zfs_upgrade(zfsvfs_t *zfsvfs, dmu_tx_t *tx); extern int zfs_create_share_dir(zfsvfs_t *zfsvfs, dmu_tx_t *tx); +#if defined(HAVE_UIO_RW) extern caddr_t zfs_map_page(page_t *, enum seg_rw); extern void zfs_unmap_page(page_t *, caddr_t); +#endif /* HAVE_UIO_RW */ extern zil_get_data_t zfs_get_data; extern zil_replay_func_t *zfs_replay_vector[TX_MAX_TYPE]; diff --git a/module/zfs/include/sys/zvol.h b/module/zfs/include/sys/zvol.h index 0059bf5..c8b9d65 100644 --- a/module/zfs/include/sys/zvol.h +++ b/module/zfs/include/sys/zvol.h @@ -28,49 +28,26 @@ #include -#ifdef __cplusplus -extern "C" { -#endif - #define ZVOL_OBJ 1ULL #define ZVOL_ZAP_OBJ 2ULL #ifdef _KERNEL + +#include + extern int zvol_check_volsize(uint64_t volsize, uint64_t blocksize); extern int zvol_check_volblocksize(uint64_t volblocksize); extern int zvol_get_stats(objset_t *os, nvlist_t *nv); extern void zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx); extern int zvol_create_minor(const char *); +extern int zvol_create_minors(const char *); extern int zvol_remove_minor(const char *); extern void zvol_remove_minors(const char *); -extern int zvol_set_volsize(const char *, major_t, uint64_t); +extern int zvol_set_volsize(const char *, uint64_t); +extern int zvol_set_volblocksize(const char *, uint64_t); -extern int zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr); -extern int zvol_dump(dev_t dev, caddr_t addr, daddr_t offset, int nblocks); -extern int zvol_close(dev_t dev, int flag, int otyp, cred_t *cr); -extern int zvol_strategy(buf_t *bp); -extern int zvol_read(dev_t dev, uio_t *uiop, cred_t *cr); -extern int zvol_write(dev_t dev, uio_t *uiop, cred_t *cr); -extern int zvol_aread(dev_t dev, struct aio_req *aio, cred_t *cr); -extern int zvol_awrite(dev_t dev, struct aio_req *aio, cred_t *cr); -extern int zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, - int *rvalp); -extern int zvol_busy(void); -extern void zvol_init(void); +extern int zvol_init(void); extern void zvol_fini(void); -extern int zvol_get_volume_params(minor_t minor, uint64_t *blksize, - uint64_t *max_xfer_len, void **minor_hdl, void **objset_hdl, void **zil_hdl, - void **rl_hdl, void **bonus_hdl); -extern uint64_t zvol_get_volume_size(void *minor_hdl); -extern int zvol_get_volume_wce(void *minor_hdl); -extern void zvol_log_write_minor(void *minor_hdl, dmu_tx_t *tx, offset_t off, - ssize_t resid, boolean_t sync); - -#endif - -#ifdef __cplusplus -} -#endif - -#endif /* _SYS_ZVOL_H */ +#endif /* _KERNEL */ +#endif /* _SYS_ZVOL_H */ diff --git a/module/zfs/rrwlock.c b/module/zfs/rrwlock.c index 4cef53f..8d05d93 100644 --- a/module/zfs/rrwlock.c +++ b/module/zfs/rrwlock.c @@ -23,6 +23,8 @@ * Use is subject to license terms. */ +#ifdef HAVE_ZPL + #include #include @@ -262,3 +264,4 @@ rrw_held(rrwlock_t *rrl, krw_t rw) return (held); } +#endif /* HAVE_ZPL */ diff --git a/module/zfs/spa_misc.c b/module/zfs/spa_misc.c index 4027d0f..6fb3f90 100644 --- a/module/zfs/spa_misc.c +++ b/module/zfs/spa_misc.c @@ -1510,12 +1510,6 @@ spa_name_compare(const void *a1, const void *a2) return (0); } -int -spa_busy(void) -{ - return (spa_active_count); -} - void spa_boot_init(void) { diff --git a/module/zfs/vdev.c b/module/zfs/vdev.c index 4613e95..1c14c77 100644 --- a/module/zfs/vdev.c +++ b/module/zfs/vdev.c @@ -1069,6 +1069,15 @@ vdev_open_child(void *arg) boolean_t vdev_uses_zvols(vdev_t *vd) { +/* + * Stacking zpools on top of zvols is unsupported until we implement a method + * for determining if an arbitrary block device is a zvol without using the + * path. Solaris would check the 'zvol' path component but this does not + * exist in the Linux port, so we really should do something like stat the + * file and check the major number. This is complicated by the fact that + * we need to do this portably in user or kernel space. + */ +#if 0 int c; if (vd->vdev_path && strncmp(vd->vdev_path, ZVOL_DIR, @@ -1077,6 +1086,7 @@ vdev_uses_zvols(vdev_t *vd) for (c = 0; c < vd->vdev_children; c++) if (vdev_uses_zvols(vd->vdev_child[c])) return (B_TRUE); +#endif return (B_FALSE); } diff --git a/module/zfs/vdev_disk.c b/module/zfs/vdev_disk.c new file mode 100644 index 0000000..dbf9b08 --- /dev/null +++ b/module/zfs/vdev_disk.c @@ -0,0 +1,654 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright (C) 2008-2010 Lawrence Livermore National Security, LLC. + * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER). + * Rewritten for Linux by Brian Behlendorf . + * LLNL-CODE-403049. + */ + +#include +#include +#include +#include +#include +#include +#include + +/* + * Virtual device vector for disks. + */ +typedef struct dio_request { + struct completion dr_comp; /* Completion for sync IO */ + atomic_t dr_ref; /* References */ + zio_t *dr_zio; /* Parent ZIO */ + int dr_rw; /* Read/Write */ + int dr_error; /* Bio error */ + int dr_bio_count; /* Count of bio's */ + struct bio *dr_bio[0]; /* Attached bio's */ +} dio_request_t; + + +#ifdef HAVE_OPEN_BDEV_EXCLUSIVE +static fmode_t +vdev_bdev_mode(int smode) +{ + fmode_t mode = 0; + + ASSERT3S(smode & (FREAD | FWRITE), !=, 0); + + if (smode & FREAD) + mode |= FMODE_READ; + + if (smode & FWRITE) + mode |= FMODE_WRITE; + + return mode; +} +#else +static int +vdev_bdev_mode(int smode) +{ + int mode = 0; + + ASSERT3S(smode & (FREAD | FWRITE), !=, 0); + + if ((smode & FREAD) && !(smode & FWRITE)) + mode = MS_RDONLY; + + return mode; +} +#endif /* HAVE_OPEN_BDEV_EXCLUSIVE */ + +static uint64_t +bdev_capacity(struct block_device *bdev) +{ + struct hd_struct *part = bdev->bd_part; + + /* The partition capacity referenced by the block device */ + if (part) + return part->nr_sects; + + /* Otherwise assume the full device capacity */ + return get_capacity(bdev->bd_disk); +} + +static int +vdev_disk_open(vdev_t *v, uint64_t *psize, uint64_t *ashift) +{ + struct block_device *bdev; + vdev_disk_t *vd; + int mode, block_size; + + /* Must have a pathname and it must be absolute. */ + if (v->vdev_path == NULL || v->vdev_path[0] != '/') { + v->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; + return EINVAL; + } + + vd = kmem_zalloc(sizeof(vdev_disk_t), KM_SLEEP); + if (vd == NULL) + return ENOMEM; + + /* + * Devices are always opened by the path provided at configuration + * time. This means that if the provided path is a udev by-id path + * then drives may be recabled without an issue. If the provided + * path is a udev by-path path then the physical location information + * will be preserved. This can be critical for more complicated + * configurations where drives are located in specific physical + * locations to maximize the systems tolerence to component failure. + * Alternately you can provide your own udev rule to flexibly map + * the drives as you see fit. It is not advised that you use the + * /dev/[hd]d devices which may be reorder due to probing order. + * Devices in the wrong locations will be detected by the higher + * level vdev validation. + */ + mode = spa_mode(v->vdev_spa); + bdev = vdev_bdev_open(v->vdev_path, vdev_bdev_mode(mode), vd); + if (IS_ERR(bdev)) { + kmem_free(vd, sizeof(vdev_disk_t)); + return -PTR_ERR(bdev); + } + + v->vdev_tsd = vd; + vd->vd_bdev = bdev; + block_size = vdev_bdev_block_size(bdev); + + /* Check if this is a whole device. When bdev->bd_contains == + * bdev we have a whole device and not simply a partition. */ + v->vdev_wholedisk = !!(bdev->bd_contains == bdev); + + /* Clear the nowritecache bit, causes vdev_reopen() to try again. */ + v->vdev_nowritecache = B_FALSE; + + /* Physical volume size in bytes */ + *psize = bdev_capacity(bdev) * block_size; + + /* Based on the minimum sector size set the block size */ + *ashift = highbit(MAX(block_size, SPA_MINBLOCKSIZE)) - 1; + + return 0; +} + +static void +vdev_disk_close(vdev_t *v) +{ + vdev_disk_t *vd = v->vdev_tsd; + + if (vd == NULL) + return; + + if (vd->vd_bdev != NULL) + vdev_bdev_close(vd->vd_bdev, + vdev_bdev_mode(spa_mode(v->vdev_spa))); + + kmem_free(vd, sizeof(vdev_disk_t)); + v->vdev_tsd = NULL; +} + +static dio_request_t * +vdev_disk_dio_alloc(int bio_count) +{ + dio_request_t *dr; + int i; + + dr = kmem_zalloc(sizeof(dio_request_t) + + sizeof(struct bio *) * bio_count, KM_SLEEP); + if (dr) { + init_completion(&dr->dr_comp); + atomic_set(&dr->dr_ref, 0); + dr->dr_bio_count = bio_count; + dr->dr_error = 0; + + for (i = 0; i < dr->dr_bio_count; i++) + dr->dr_bio[i] = NULL; + } + + return dr; +} + +static void +vdev_disk_dio_free(dio_request_t *dr) +{ + int i; + + for (i = 0; i < dr->dr_bio_count; i++) + if (dr->dr_bio[i]) + bio_put(dr->dr_bio[i]); + + kmem_free(dr, sizeof(dio_request_t) + + sizeof(struct bio *) * dr->dr_bio_count); +} + +static void +vdev_disk_dio_get(dio_request_t *dr) +{ + atomic_inc(&dr->dr_ref); +} + +static int +vdev_disk_dio_put(dio_request_t *dr) +{ + int rc = atomic_dec_return(&dr->dr_ref); + + /* + * Free the dio_request when the last reference is dropped and + * ensure zio_interpret is called only once with the correct zio + */ + if (rc == 0) { + zio_t *zio = dr->dr_zio; + int error = dr->dr_error; + + vdev_disk_dio_free(dr); + + if (zio) { + zio->io_error = error; + zio_interrupt(zio); + } + } + + return rc; +} + +BIO_END_IO_PROTO(vdev_disk_physio_completion, bio, size, error) +{ + dio_request_t *dr = bio->bi_private; + int rc; + + /* Fatal error but print some useful debugging before asserting */ + if (dr == NULL) + PANIC("dr == NULL, bio->bi_private == NULL\n" + "bi_next: %p, bi_flags: %lx, bi_rw: %lu, bi_vcnt: %d\n" + "bi_idx: %d, bi_size: %d, bi_end_io: %p, bi_cnt: %d\n", + bio->bi_next, bio->bi_flags, bio->bi_rw, bio->bi_vcnt, + bio->bi_idx, bio->bi_size, bio->bi_end_io, + atomic_read(&bio->bi_cnt)); + +#ifndef HAVE_2ARGS_BIO_END_IO_T + if (bio->bi_size) + return 1; +#endif /* HAVE_2ARGS_BIO_END_IO_T */ + + if (error == 0 && !test_bit(BIO_UPTODATE, &bio->bi_flags)) + error = EIO; + + if (dr->dr_error == 0) + dr->dr_error = error; + + /* Drop reference aquired by __vdev_disk_physio */ + rc = vdev_disk_dio_put(dr); + + /* Wake up synchronous waiter this is the last outstanding bio */ + if ((rc == 1) && (dr->dr_rw & (1 << DIO_RW_SYNCIO))) + complete(&dr->dr_comp); + + BIO_END_IO_RETURN(0); +} + +static inline unsigned long +bio_nr_pages(void *bio_ptr, unsigned int bio_size) +{ + return ((((unsigned long)bio_ptr + bio_size + PAGE_SIZE - 1) >> + PAGE_SHIFT) - ((unsigned long)bio_ptr >> PAGE_SHIFT)); +} + +static unsigned int +bio_map(struct bio *bio, void *bio_ptr, unsigned int bio_size) +{ + unsigned int offset, size, i; + struct page *page; + + offset = offset_in_page(bio_ptr); + for (i = 0; i < bio->bi_max_vecs; i++) { + size = PAGE_SIZE - offset; + + if (bio_size <= 0) + break; + + if (size > bio_size) + size = bio_size; + + if (kmem_virt(bio_ptr)) + page = vmalloc_to_page(bio_ptr); + else + page = virt_to_page(bio_ptr); + + if (bio_add_page(bio, page, size, offset) != size) + break; + + bio_ptr += size; + bio_size -= size; + offset = 0; + } + + return bio_size; +} + +static int +__vdev_disk_physio(struct block_device *bdev, zio_t *zio, caddr_t kbuf_ptr, + size_t kbuf_size, uint64_t kbuf_offset, int flags) +{ + dio_request_t *dr; + caddr_t bio_ptr; + uint64_t bio_offset; + int bio_size, bio_count = 16; + int i = 0, error = 0, block_size; + +retry: + dr = vdev_disk_dio_alloc(bio_count); + if (dr == NULL) + return ENOMEM; + + dr->dr_zio = zio; + dr->dr_rw = flags; + block_size = vdev_bdev_block_size(bdev); + +#ifdef BIO_RW_FAILFAST + if (flags & (1 << BIO_RW_FAILFAST)) + dr->dr_rw |= 1 << BIO_RW_FAILFAST; +#endif /* BIO_RW_FAILFAST */ + + /* + * When the IO size exceeds the maximum bio size for the request + * queue we are forced to break the IO in multiple bio's and wait + * for them all to complete. Ideally, all pool users will set + * their volume block size to match the maximum request size and + * the common case will be one bio per vdev IO request. + */ + bio_ptr = kbuf_ptr; + bio_offset = kbuf_offset; + bio_size = kbuf_size; + for (i = 0; i <= dr->dr_bio_count; i++) { + + /* Finished constructing bio's for given buffer */ + if (bio_size <= 0) + break; + + /* + * By default only 'bio_count' bio's per dio are allowed. + * However, if we find ourselves in a situation where more + * are needed we allocate a larger dio and warn the user. + */ + if (dr->dr_bio_count == i) { + vdev_disk_dio_free(dr); + bio_count *= 2; + printk("WARNING: Resized bio's/dio to %d\n",bio_count); + goto retry; + } + + dr->dr_bio[i] = bio_alloc(GFP_NOIO, + bio_nr_pages(bio_ptr, bio_size)); + if (dr->dr_bio[i] == NULL) { + vdev_disk_dio_free(dr); + return ENOMEM; + } + + /* Matching put called by vdev_disk_physio_completion */ + vdev_disk_dio_get(dr); + + dr->dr_bio[i]->bi_bdev = bdev; + dr->dr_bio[i]->bi_sector = bio_offset / block_size; + dr->dr_bio[i]->bi_rw = dr->dr_rw; + dr->dr_bio[i]->bi_end_io = vdev_disk_physio_completion; + dr->dr_bio[i]->bi_private = dr; + + /* Remaining size is returned to become the new size */ + bio_size = bio_map(dr->dr_bio[i], bio_ptr, bio_size); + + /* Advance in buffer and construct another bio if needed */ + bio_ptr += dr->dr_bio[i]->bi_size; + bio_offset += dr->dr_bio[i]->bi_size; + } + + /* Extra reference to protect dio_request during submit_bio */ + vdev_disk_dio_get(dr); + + /* Submit all bio's associated with this dio */ + for (i = 0; i < dr->dr_bio_count; i++) + if (dr->dr_bio[i]) + submit_bio(dr->dr_rw, dr->dr_bio[i]); + + /* + * On synchronous blocking requests we wait for all bio the completion + * callbacks to run. We will be woken when the last callback runs + * for this dio. We are responsible for putting the last dio_request + * reference will in turn put back the last bio references. The + * only synchronous consumer is vdev_disk_read_rootlabel() all other + * IO originating from vdev_disk_io_start() is asynchronous. + */ + if (dr->dr_rw & (1 << DIO_RW_SYNCIO)) { + wait_for_completion(&dr->dr_comp); + error = dr->dr_error; + ASSERT3S(atomic_read(&dr->dr_ref), ==, 1); + } + + (void)vdev_disk_dio_put(dr); + + return error; +} + +int +vdev_disk_physio(struct block_device *bdev, caddr_t kbuf, + size_t size, uint64_t offset, int flags) +{ + return __vdev_disk_physio(bdev, NULL, kbuf, size, offset, flags); +} + +/* 2.6.24 API change */ +#ifdef HAVE_BIO_EMPTY_BARRIER +BIO_END_IO_PROTO(vdev_disk_io_flush_completion, bio, size, rc) +{ + zio_t *zio = bio->bi_private; + + zio->io_error = -rc; + if (rc && (rc == -EOPNOTSUPP)) + zio->io_vd->vdev_nowritecache = B_TRUE; + + bio_put(bio); + zio_interrupt(zio); + + BIO_END_IO_RETURN(0); +} + +static int +vdev_disk_io_flush(struct block_device *bdev, zio_t *zio) +{ + struct request_queue *q; + struct bio *bio; + + q = bdev_get_queue(bdev); + if (!q) + return ENXIO; + + bio = bio_alloc(GFP_KERNEL, 0); + if (!bio) + return ENOMEM; + + bio->bi_end_io = vdev_disk_io_flush_completion; + bio->bi_private = zio; + bio->bi_bdev = bdev; + submit_bio(WRITE_BARRIER, bio); + + return 0; +} +#else +static int +vdev_disk_io_flush(struct block_device *bdev, zio_t *zio) +{ + return ENOTSUP; +} +#endif /* HAVE_BIO_EMPTY_BARRIER */ + +static int +vdev_disk_io_start(zio_t *zio) +{ + vdev_t *v = zio->io_vd; + vdev_disk_t *vd = v->vdev_tsd; + int flags, error; + + switch (zio->io_type) { + case ZIO_TYPE_IOCTL: + + if (!vdev_readable(v)) { + zio->io_error = ENXIO; + return ZIO_PIPELINE_CONTINUE; + } + + switch (zio->io_cmd) { + case DKIOCFLUSHWRITECACHE: + + if (zfs_nocacheflush) + break; + + if (v->vdev_nowritecache) { + zio->io_error = ENOTSUP; + break; + } + + error = vdev_disk_io_flush(vd->vd_bdev, zio); + if (error == 0) + return ZIO_PIPELINE_STOP; + + zio->io_error = error; + if (error == ENOTSUP) + v->vdev_nowritecache = B_TRUE; + + break; + + default: + zio->io_error = ENOTSUP; + } + + return ZIO_PIPELINE_CONTINUE; + + case ZIO_TYPE_WRITE: + flags = WRITE; + break; + + case ZIO_TYPE_READ: + flags = READ; + break; + + default: + zio->io_error = ENOTSUP; + return ZIO_PIPELINE_CONTINUE; + } + +#ifdef BIO_RW_FAILFAST + if (zio->io_flags & (ZIO_FLAG_IO_RETRY | ZIO_FLAG_TRYHARD)) + flags |= (1 << BIO_RW_FAILFAST); +#endif /* BIO_RW_FAILFAST */ + + error = __vdev_disk_physio(vd->vd_bdev, zio, zio->io_data, + zio->io_size, zio->io_offset, flags); + if (error) { + zio->io_error = error; + return ZIO_PIPELINE_CONTINUE; + } + + return ZIO_PIPELINE_STOP; +} + +static void +vdev_disk_io_done(zio_t *zio) +{ + /* + * If the device returned EIO, we revalidate the media. If it is + * determined the media has changed this triggers the asynchronous + * removal of the device from the configuration. + */ + if (zio->io_error == EIO) { + vdev_t *v = zio->io_vd; + vdev_disk_t *vd = v->vdev_tsd; + + if (check_disk_change(vd->vd_bdev)) { + vdev_bdev_invalidate(vd->vd_bdev); + v->vdev_remove_wanted = B_TRUE; + spa_async_request(zio->io_spa, SPA_ASYNC_REMOVE); + } + } +} + +static void +vdev_disk_hold(vdev_t *vd) +{ + ASSERT(spa_config_held(vd->vdev_spa, SCL_STATE, RW_WRITER)); + + /* We must have a pathname, and it must be absolute. */ + if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') + return; + + /* + * Only prefetch path and devid info if the device has + * never been opened. + */ + if (vd->vdev_tsd != NULL) + return; + + /* XXX: Implement me as a vnode lookup for the device */ + vd->vdev_name_vp = NULL; + vd->vdev_devid_vp = NULL; +} + +static void +vdev_disk_rele(vdev_t *vd) +{ + ASSERT(spa_config_held(vd->vdev_spa, SCL_STATE, RW_WRITER)); + + /* XXX: Implement me as a vnode rele for the device */ +} + +vdev_ops_t vdev_disk_ops = { + vdev_disk_open, + vdev_disk_close, + vdev_default_asize, + vdev_disk_io_start, + vdev_disk_io_done, + NULL, + vdev_disk_hold, + vdev_disk_rele, + VDEV_TYPE_DISK, /* name of this vdev type */ + B_TRUE /* leaf vdev */ +}; + +/* + * Given the root disk device devid or pathname, read the label from + * the device, and construct a configuration nvlist. + */ +int +vdev_disk_read_rootlabel(char *devpath, char *devid, nvlist_t **config) +{ + struct block_device *bdev; + vdev_label_t *label; + uint64_t s, size; + int i; + + bdev = vdev_bdev_open(devpath, vdev_bdev_mode(FREAD), NULL); + if (IS_ERR(bdev)) + return -PTR_ERR(bdev); + + s = bdev_capacity(bdev) * vdev_bdev_block_size(bdev); + if (s == 0) { + vdev_bdev_close(bdev, vdev_bdev_mode(FREAD)); + return EIO; + } + + size = P2ALIGN_TYPED(s, sizeof(vdev_label_t), uint64_t); + label = vmem_alloc(sizeof(vdev_label_t), KM_SLEEP); + + for (i = 0; i < VDEV_LABELS; i++) { + uint64_t offset, state, txg = 0; + + /* read vdev label */ + offset = vdev_label_offset(size, i, 0); + if (vdev_disk_physio(bdev, (caddr_t)label, + VDEV_SKIP_SIZE + VDEV_PHYS_SIZE, offset, READ_SYNC) != 0) + continue; + + if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist, + sizeof (label->vl_vdev_phys.vp_nvlist), config, 0) != 0) { + *config = NULL; + continue; + } + + if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE, + &state) != 0 || state >= POOL_STATE_DESTROYED) { + nvlist_free(*config); + *config = NULL; + continue; + } + + if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG, + &txg) != 0 || txg == 0) { + nvlist_free(*config); + *config = NULL; + continue; + } + + break; + } + + vmem_free(label, sizeof(vdev_label_t)); + vdev_bdev_close(bdev, vdev_bdev_mode(FREAD)); + + return 0; +} diff --git a/module/zfs/zfs_acl.c b/module/zfs/zfs_acl.c index 843b5ff..f1ba9af 100644 --- a/module/zfs/zfs_acl.c +++ b/module/zfs/zfs_acl.c @@ -22,6 +22,8 @@ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. */ +#ifdef HAVE_ZPL + #include #include #include @@ -2746,3 +2748,5 @@ zfs_zaccess_rename(znode_t *sdzp, znode_t *szp, znode_t *tdzp, return (error); } + +#endif /* HAVE_ZPL */ diff --git a/module/zfs/zfs_ctldir.c b/module/zfs/zfs_ctldir.c index 815f889..51b12a1 100644 --- a/module/zfs/zfs_ctldir.c +++ b/module/zfs/zfs_ctldir.c @@ -63,6 +63,8 @@ * so that it cannot be freed until all snapshots have been unmounted. */ +#ifdef HAVE_ZPL + #include #include #include @@ -1347,3 +1349,4 @@ zfsctl_umount_snapshots(vfs_t *vfsp, int fflags, cred_t *cr) return (error); } +#endif /* HAVE_ZPL */ diff --git a/module/zfs/zfs_dir.c b/module/zfs/zfs_dir.c index b06d29a..f0084cd 100644 --- a/module/zfs/zfs_dir.c +++ b/module/zfs/zfs_dir.c @@ -22,6 +22,8 @@ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. */ +#ifdef HAVE_ZPL + #include #include #include @@ -1087,3 +1089,4 @@ zfs_sticky_remove_access(znode_t *zdp, znode_t *zp, cred_t *cr) else return (secpolicy_vnode_remove(cr)); } +#endif /* HAVE_ZPL */ diff --git a/module/zfs/zfs_fuid.c b/module/zfs/zfs_fuid.c index 1773a14..97fceea 100644 --- a/module/zfs/zfs_fuid.c +++ b/module/zfs/zfs_fuid.c @@ -192,6 +192,7 @@ zfs_fuid_idx_domain(avl_tree_t *idx_tree, uint32_t idx) } #ifdef _KERNEL +#ifdef HAVE_ZPL /* * Load the fuid table(s) into memory. */ @@ -753,4 +754,5 @@ zfs_fuid_txhold(zfsvfs_t *zfsvfs, dmu_tx_t *tx) FUID_SIZE_ESTIMATE(zfsvfs)); } } +#endif /* HAVE_ZPL */ #endif diff --git a/module/zfs/zfs_ioctl.c b/module/zfs/zfs_ioctl.c index 99287e4..902c234 100644 --- a/module/zfs/zfs_ioctl.c +++ b/module/zfs/zfs_ioctl.c @@ -1292,6 +1292,9 @@ zfs_ioc_pool_import(zfs_cmd_t *zc) error = err; } + if (error == 0) + zvol_create_minors(zc->zc_name); + nvlist_free(config); if (props) @@ -2179,8 +2182,7 @@ zfs_prop_set_special(const char *dsname, zprop_source_t source, err = dsl_dataset_set_reservation(dsname, source, intval); break; case ZFS_PROP_VOLSIZE: - err = zvol_set_volsize(dsname, ddi_driver_major(zfs_dip), - intval); + err = zvol_set_volsize(dsname, intval); break; case ZFS_PROP_VERSION: { @@ -2654,6 +2656,30 @@ zfs_ioc_pool_get_props(zfs_cmd_t *zc) /* * inputs: + * zc_name name of volume + * + * outputs: none + */ +static int +zfs_ioc_create_minor(zfs_cmd_t *zc) +{ + return (zvol_create_minor(zc->zc_name)); +} + +/* + * inputs: + * zc_name name of volume + * + * outputs: none + */ +static int +zfs_ioc_remove_minor(zfs_cmd_t *zc) +{ + return (zvol_remove_minor(zc->zc_name)); +} + +/* + * inputs: * zc_name name of filesystem * zc_nvlist_src{_size} nvlist of delegated permissions * zc_perm_action allow/unallow flag @@ -4805,6 +4831,10 @@ static zfs_ioc_vec_t zfs_ioc_vec[] = { POOL_CHECK_SUSPENDED }, { zfs_ioc_set_prop, zfs_secpolicy_none, DATASET_NAME, B_TRUE, POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY }, + { zfs_ioc_create_minor, zfs_secpolicy_config, DATASET_NAME, B_FALSE, + POOL_CHECK_NONE }, + { zfs_ioc_remove_minor, zfs_secpolicy_config, DATASET_NAME, B_FALSE, + POOL_CHECK_NONE }, { zfs_ioc_create, zfs_secpolicy_create, DATASET_NAME, B_TRUE, POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY }, { zfs_ioc_destroy, zfs_secpolicy_destroy, DATASET_NAME, B_TRUE, diff --git a/module/zfs/zfs_log.c b/module/zfs/zfs_log.c index 26ab782..59a6451 100644 --- a/module/zfs/zfs_log.c +++ b/module/zfs/zfs_log.c @@ -22,6 +22,8 @@ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. */ +#ifdef HAVE_ZPL + #include #include #include @@ -674,3 +676,5 @@ zfs_log_acl(zilog_t *zilog, dmu_tx_t *tx, znode_t *zp, itx->itx_sync = (zp->z_sync_cnt != 0); zil_itx_assign(zilog, itx, tx); } + +#endif /* HAVE_ZPL */ diff --git a/module/zfs/zfs_replay.c b/module/zfs/zfs_replay.c index 9fb3368..bd29ab9 100644 --- a/module/zfs/zfs_replay.c +++ b/module/zfs/zfs_replay.c @@ -22,6 +22,8 @@ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. */ +#ifdef HAVE_ZPL + #include #include #include @@ -929,3 +931,4 @@ zil_replay_func_t *zfs_replay_vector[TX_MAX_TYPE] = { zfs_replay_create_acl, /* TX_MKDIR_ACL_ATTR */ zfs_replay_write2, /* TX_WRITE2 */ }; +#endif /* HAVE_ZPL */ diff --git a/module/zfs/zfs_vfsops.c b/module/zfs/zfs_vfsops.c index cb8c1d0..7e4e82f 100644 --- a/module/zfs/zfs_vfsops.c +++ b/module/zfs/zfs_vfsops.c @@ -65,6 +65,7 @@ #include #include "zfs_comutil.h" +#ifdef HAVE_ZPL int zfsfstype; vfsops_t *zfs_vfsops = NULL; static major_t zfs_major; @@ -2127,10 +2128,12 @@ zfs_vfsinit(int fstype, char *name) return (0); } +#endif /* HAVE_ZPL */ void zfs_init(void) { +#ifdef HAVE_ZPL /* * Initialize .zfs directory structures */ @@ -2142,21 +2145,19 @@ zfs_init(void) zfs_znode_init(); dmu_objset_register_type(DMU_OST_ZFS, zfs_space_delta_cb); +#endif /* HAVE_ZPL */ } void zfs_fini(void) { +#ifdef HAVE_ZPL zfsctl_fini(); zfs_znode_fini(); +#endif /* HAVE_ZPL */ } -int -zfs_busy(void) -{ - return (zfs_active_fs_count != 0); -} - +#ifdef HAVE_ZPL int zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers) { @@ -2224,6 +2225,7 @@ zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers) return (0); } +#endif /* HAVE_ZPL */ /* * Read a property stored within the master node. @@ -2267,6 +2269,7 @@ zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value) return (error); } +#ifdef HAVE_ZPL static vfsdef_t vfw = { VFSDEF_VERSION, MNTTYPE_ZFS, @@ -2279,3 +2282,4 @@ static vfsdef_t vfw = { struct modlfs zfs_modlfs = { &mod_fsops, "ZFS filesystem version " SPA_VERSION_STRING, &vfw }; +#endif /* HAVE_ZPL */ diff --git a/module/zfs/zfs_vnops.c b/module/zfs/zfs_vnops.c index a072007..5899c7f 100644 --- a/module/zfs/zfs_vnops.c +++ b/module/zfs/zfs_vnops.c @@ -25,6 +25,8 @@ /* Portions Copyright 2007 Jeremy Teo */ /* Portions Copyright 2010 Robert Milkowski */ +#ifdef HAVE_ZPL + #include #include #include @@ -319,6 +321,7 @@ zfs_ioctl(vnode_t *vp, int com, intptr_t data, int flag, cred_t *cred, return (ENOTTY); } +#if defined(_KERNEL) && defined(HAVE_UIO_RW) /* * Utility functions to map and unmap a single physical page. These * are used to manage the mappable copies of ZFS file data, and therefore @@ -343,6 +346,7 @@ zfs_unmap_page(page_t *pp, caddr_t addr) ppmapout(addr); } } +#endif /* _KERNEL && HAVE_UIO_RW */ /* * When a file is memory mapped, we must keep the IO data synchronized @@ -5241,3 +5245,4 @@ const fs_operation_def_t zfs_evnodeops_template[] = { VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf }, NULL, NULL }; +#endif /* HAVE_ZPL */ diff --git a/module/zfs/zfs_znode.c b/module/zfs/zfs_znode.c index 79d8d2e..5e6bab8 100644 --- a/module/zfs/zfs_znode.c +++ b/module/zfs/zfs_znode.c @@ -88,6 +88,7 @@ * (such as VFS logic) that will not compile easily in userland. */ #ifdef _KERNEL +#ifdef HAVE_ZPL /* * Needed to close a small window in zfs_znode_move() that allows the zfsvfs to * be freed before it can be safely accessed. @@ -1737,22 +1738,29 @@ log: dmu_tx_commit(tx); return (0); } +#endif /* HAVE_ZPL */ void zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx) { - zfsvfs_t zfsvfs; uint64_t moid, obj, sa_obj, version; uint64_t sense = ZFS_CASE_SENSITIVE; uint64_t norm = 0; nvpair_t *elem; int error; +#ifdef HAVE_ZPL + zfsvfs_t zfsvfs; int i; znode_t *rootzp = NULL; vnode_t *vp; vattr_t vattr; znode_t *zp; zfs_acl_ids_t acl_ids; +#else + timestruc_t now; + dmu_buf_t *db; + znode_phys_t *pzp; +#endif /* HAVE_ZPL */ /* * First attempt to create master node. @@ -1814,6 +1822,7 @@ zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx) error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &obj, tx); ASSERT(error == 0); +#ifdef HAVE_ZPL /* * Create root znode. Create minimal znode/vnode/zfsvfs * to allow zfs_mknode to work. @@ -1879,17 +1888,49 @@ zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx) ZTOV(rootzp)->v_count = 0; sa_handle_destroy(rootzp->z_sa_hdl); kmem_cache_free(znode_cache, rootzp); + error = zfs_create_share_dir(&zfsvfs, tx); + for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) + mutex_destroy(&zfsvfs.z_hold_mtx[i]); +#else /* - * Create shares directory + * Create root znode with code free of VFS dependencies */ + obj = zap_create_norm(os, norm, DMU_OT_DIRECTORY_CONTENTS, + DMU_OT_ZNODE, sizeof (znode_phys_t), tx); - error = zfs_create_share_dir(&zfsvfs, tx); + VERIFY(0 == dmu_bonus_hold(os, obj, FTAG, &db)); + dmu_buf_will_dirty(db, tx); + /* + * Initialize the znode physical data to zero. + */ + ASSERT(db->db_size >= sizeof (znode_phys_t)); + bzero(db->db_data, db->db_size); + pzp = db->db_data; + + if (USE_FUIDS(version, os)) + pzp->zp_flags = ZFS_ARCHIVE | ZFS_AV_MODIFIED; + + pzp->zp_size = 2; /* "." and ".." */ + pzp->zp_links = 2; + pzp->zp_parent = obj; + pzp->zp_gen = dmu_tx_get_txg(tx); + pzp->zp_mode = S_IFDIR | 0755; + pzp->zp_flags = ZFS_ACL_TRIVIAL; + + gethrestime(&now); + + ZFS_TIME_ENCODE(&now, pzp->zp_crtime); + ZFS_TIME_ENCODE(&now, pzp->zp_ctime); + ZFS_TIME_ENCODE(&now, pzp->zp_atime); + ZFS_TIME_ENCODE(&now, pzp->zp_mtime); + + error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &obj, tx); ASSERT(error == 0); - for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) - mutex_destroy(&zfsvfs.z_hold_mtx[i]); + dmu_buf_rele(db, FTAG); +#endif /* HAVE_ZPL */ } #endif /* _KERNEL */ diff --git a/module/zfs/zvol.c b/module/zfs/zvol.c new file mode 100644 index 0000000..6e92942 --- /dev/null +++ b/module/zfs/zvol.c @@ -0,0 +1,1337 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright (C) 2008-2010 Lawrence Livermore National Security, LLC. + * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER). + * Rewritten for Linux by Brian Behlendorf . + * LLNL-CODE-403049. + * + * ZFS volume emulation driver. + * + * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes. + * Volumes are accessed through the symbolic links named: + * + * /dev// + * + * Volumes are persistent through reboot and module load. No user command + * needs to be run before opening and using a device. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +unsigned int zvol_major = ZVOL_MAJOR; +unsigned int zvol_threads = 0; + +static taskq_t *zvol_taskq; +static kmutex_t zvol_state_lock; +static list_t zvol_state_list; +static char *zvol_tag = "zvol_tag"; + +/* + * The in-core state of each volume. + */ +typedef struct zvol_state { + char zv_name[DISK_NAME_LEN]; /* name */ + uint64_t zv_volsize; /* advertised space */ + uint64_t zv_volblocksize;/* volume block size */ + objset_t *zv_objset; /* objset handle */ + uint32_t zv_flags; /* ZVOL_* flags */ + uint32_t zv_open_count; /* open counts */ + uint32_t zv_changed; /* disk changed */ + zilog_t *zv_zilog; /* ZIL handle */ + znode_t zv_znode; /* for range locking */ + dmu_buf_t *zv_dbuf; /* bonus handle */ + dev_t zv_dev; /* device id */ + struct gendisk *zv_disk; /* generic disk */ + struct request_queue *zv_queue; /* request queue */ + spinlock_t zv_lock; /* request queue lock */ + list_node_t zv_next; /* next zvol_state_t linkage */ +} zvol_state_t; + +#define ZVOL_RDONLY 0x1 + +/* + * Find the next available range of ZVOL_MINORS minor numbers. The + * zvol_state_list is kept in ascending minor order so we simply need + * to scan the list for the first gap in the sequence. This allows us + * to recycle minor number as devices are created and removed. + */ +static int +zvol_find_minor(unsigned *minor) +{ + zvol_state_t *zv; + + *minor = 0; + ASSERT(MUTEX_HELD(&zvol_state_lock)); + for (zv = list_head(&zvol_state_list); zv != NULL; + zv = list_next(&zvol_state_list, zv), *minor += ZVOL_MINORS) { + if (MINOR(zv->zv_dev) != MINOR(*minor)) + break; + } + + /* All minors are in use */ + if (*minor >= (1 << MINORBITS)) + return ENXIO; + + return 0; +} + +/* + * Find a zvol_state_t given the full major+minor dev_t. + */ +static zvol_state_t * +zvol_find_by_dev(dev_t dev) +{ + zvol_state_t *zv; + + ASSERT(MUTEX_HELD(&zvol_state_lock)); + for (zv = list_head(&zvol_state_list); zv != NULL; + zv = list_next(&zvol_state_list, zv)) { + if (zv->zv_dev == dev) + return zv; + } + + return NULL; +} + +/* + * Find a zvol_state_t given the name provided at zvol_alloc() time. + */ +static zvol_state_t * +zvol_find_by_name(const char *name) +{ + zvol_state_t *zv; + + ASSERT(MUTEX_HELD(&zvol_state_lock)); + for (zv = list_head(&zvol_state_list); zv != NULL; + zv = list_next(&zvol_state_list, zv)) { + if (!strncmp(zv->zv_name, name, DISK_NAME_LEN)) + return zv; + } + + return NULL; +} + +/* + * ZFS_IOC_CREATE callback handles dmu zvol and zap object creation. + */ +void +zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx) +{ + zfs_creat_t *zct = arg; + nvlist_t *nvprops = zct->zct_props; + int error; + uint64_t volblocksize, volsize; + + VERIFY(nvlist_lookup_uint64(nvprops, + zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); + if (nvlist_lookup_uint64(nvprops, + zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) + volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); + + /* + * These properties must be removed from the list so the generic + * property setting step won't apply to them. + */ + VERIFY(nvlist_remove_all(nvprops, + zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); + (void) nvlist_remove_all(nvprops, + zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); + + error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, + DMU_OT_NONE, 0, tx); + ASSERT(error == 0); + + error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, + DMU_OT_NONE, 0, tx); + ASSERT(error == 0); + + error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); + ASSERT(error == 0); +} + +/* + * ZFS_IOC_OBJSET_STATS entry point. + */ +int +zvol_get_stats(objset_t *os, nvlist_t *nv) +{ + int error; + dmu_object_info_t *doi; + uint64_t val; + + error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); + if (error) + return (error); + + dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); + doi = kmem_alloc(sizeof(dmu_object_info_t), KM_SLEEP); + error = dmu_object_info(os, ZVOL_OBJ, doi); + + if (error == 0) { + dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, + doi->doi_data_block_size); + } + + kmem_free(doi, sizeof(dmu_object_info_t)); + + return (error); +} + +/* + * Sanity check volume size. + */ +int +zvol_check_volsize(uint64_t volsize, uint64_t blocksize) +{ + if (volsize == 0) + return (EINVAL); + + if (volsize % blocksize != 0) + return (EINVAL); + +#ifdef _ILP32 + if (volsize - 1 > MAXOFFSET_T) + return (EOVERFLOW); +#endif + return (0); +} + +/* + * Ensure the zap is flushed then inform the VFS of the capacity change. + */ +static int +zvol_update_volsize(zvol_state_t *zv, uint64_t volsize) +{ + struct block_device *bdev; + dmu_tx_t *tx; + int error; + + ASSERT(MUTEX_HELD(&zvol_state_lock)); + + tx = dmu_tx_create(zv->zv_objset); + dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); + error = dmu_tx_assign(tx, TXG_WAIT); + if (error) { + dmu_tx_abort(tx); + return (error); + } + + error = zap_update(zv->zv_objset, ZVOL_ZAP_OBJ, "size", 8, 1, + &volsize, tx); + dmu_tx_commit(tx); + + if (error) + return (error); + + error = dmu_free_long_range(zv->zv_objset, + ZVOL_OBJ, volsize, DMU_OBJECT_END); + if (error) + return (error); + + zv->zv_volsize = volsize; + zv->zv_changed = 1; + + bdev = bdget_disk(zv->zv_disk, 0); + if (!bdev) + return EIO; + + error = check_disk_change(bdev); + ASSERT3U(error, !=, 0); + bdput(bdev); + + return (0); +} + +/* + * Set ZFS_PROP_VOLSIZE set entry point. + */ +int +zvol_set_volsize(const char *name, uint64_t volsize) +{ + zvol_state_t *zv; + dmu_object_info_t *doi; + objset_t *os = NULL; + uint64_t readonly; + int error; + + mutex_enter(&zvol_state_lock); + + zv = zvol_find_by_name(name); + if (zv == NULL) { + error = ENXIO; + goto out; + } + + doi = kmem_alloc(sizeof(dmu_object_info_t), KM_SLEEP); + + error = dmu_objset_hold(name, FTAG, &os); + if (error) + goto out_doi; + + if ((error = dmu_object_info(os, ZVOL_OBJ, doi)) != 0 || + (error = zvol_check_volsize(volsize,doi->doi_data_block_size)) != 0) + goto out_doi; + + VERIFY(dsl_prop_get_integer(name, "readonly", &readonly, NULL) == 0); + if (readonly) { + error = EROFS; + goto out_doi; + } + + if (get_disk_ro(zv->zv_disk) || (zv->zv_flags & ZVOL_RDONLY)) { + error = EROFS; + goto out_doi; + } + + error = zvol_update_volsize(zv, volsize); +out_doi: + kmem_free(doi, sizeof(dmu_object_info_t)); +out: + if (os) + dmu_objset_rele(os, FTAG); + + mutex_exit(&zvol_state_lock); + + return (error); +} + +/* + * Sanity check volume block size. + */ +int +zvol_check_volblocksize(uint64_t volblocksize) +{ + if (volblocksize < SPA_MINBLOCKSIZE || + volblocksize > SPA_MAXBLOCKSIZE || + !ISP2(volblocksize)) + return (EDOM); + + return (0); +} + +/* + * Set ZFS_PROP_VOLBLOCKSIZE set entry point. + */ +int +zvol_set_volblocksize(const char *name, uint64_t volblocksize) +{ + zvol_state_t *zv; + dmu_tx_t *tx; + int error; + + mutex_enter(&zvol_state_lock); + + zv = zvol_find_by_name(name); + if (zv == NULL) { + error = ENXIO; + goto out; + } + + if (get_disk_ro(zv->zv_disk) || (zv->zv_flags & ZVOL_RDONLY)) { + error = EROFS; + goto out; + } + + tx = dmu_tx_create(zv->zv_objset); + dmu_tx_hold_bonus(tx, ZVOL_OBJ); + error = dmu_tx_assign(tx, TXG_WAIT); + if (error) { + dmu_tx_abort(tx); + } else { + error = dmu_object_set_blocksize(zv->zv_objset, ZVOL_OBJ, + volblocksize, 0, tx); + if (error == ENOTSUP) + error = EBUSY; + dmu_tx_commit(tx); + if (error == 0) + zv->zv_volblocksize = volblocksize; + } +out: + mutex_exit(&zvol_state_lock); + + return (error); +} + +/* + * Replay a TX_WRITE ZIL transaction that didn't get committed + * after a system failure + */ +static int +zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap) +{ + objset_t *os = zv->zv_objset; + char *data = (char *)(lr + 1); /* data follows lr_write_t */ + uint64_t off = lr->lr_offset; + uint64_t len = lr->lr_length; + dmu_tx_t *tx; + int error; + + if (byteswap) + byteswap_uint64_array(lr, sizeof (*lr)); + + tx = dmu_tx_create(os); + dmu_tx_hold_write(tx, ZVOL_OBJ, off, len); + error = dmu_tx_assign(tx, TXG_WAIT); + if (error) { + dmu_tx_abort(tx); + } else { + dmu_write(os, ZVOL_OBJ, off, len, data, tx); + dmu_tx_commit(tx); + } + + return (error); +} + +static int +zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap) +{ + return (ENOTSUP); +} + +/* + * Callback vectors for replaying records. + * Only TX_WRITE is needed for zvol. + */ +zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { + (zil_replay_func_t *)zvol_replay_err, /* no such transaction type */ + (zil_replay_func_t *)zvol_replay_err, /* TX_CREATE */ + (zil_replay_func_t *)zvol_replay_err, /* TX_MKDIR */ + (zil_replay_func_t *)zvol_replay_err, /* TX_MKXATTR */ + (zil_replay_func_t *)zvol_replay_err, /* TX_SYMLINK */ + (zil_replay_func_t *)zvol_replay_err, /* TX_REMOVE */ + (zil_replay_func_t *)zvol_replay_err, /* TX_RMDIR */ + (zil_replay_func_t *)zvol_replay_err, /* TX_LINK */ + (zil_replay_func_t *)zvol_replay_err, /* TX_RENAME */ + (zil_replay_func_t *)zvol_replay_write, /* TX_WRITE */ + (zil_replay_func_t *)zvol_replay_err, /* TX_TRUNCATE */ + (zil_replay_func_t *)zvol_replay_err, /* TX_SETATTR */ + (zil_replay_func_t *)zvol_replay_err, /* TX_ACL */ +}; + +/* + * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. + * + * We store data in the log buffers if it's small enough. + * Otherwise we will later flush the data out via dmu_sync(). + */ +ssize_t zvol_immediate_write_sz = 32768; + +static void +zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, + uint64_t offset, uint64_t size, int sync) +{ + uint32_t blocksize = zv->zv_volblocksize; + zilog_t *zilog = zv->zv_zilog; + boolean_t slogging; + + if (zil_replaying(zilog, tx)) + return; + + slogging = spa_has_slogs(zilog->zl_spa); + + while (size) { + itx_t *itx; + lr_write_t *lr; + ssize_t len; + itx_wr_state_t write_state; + + /* + * Unlike zfs_log_write() we can be called with + * up to DMU_MAX_ACCESS/2 (5MB) writes. + */ + if (blocksize > zvol_immediate_write_sz && !slogging && + size >= blocksize && offset % blocksize == 0) { + write_state = WR_INDIRECT; /* uses dmu_sync */ + len = blocksize; + } else if (sync) { + write_state = WR_COPIED; + len = MIN(ZIL_MAX_LOG_DATA, size); + } else { + write_state = WR_NEED_COPY; + len = MIN(ZIL_MAX_LOG_DATA, size); + } + + itx = zil_itx_create(TX_WRITE, sizeof (*lr) + + (write_state == WR_COPIED ? len : 0)); + lr = (lr_write_t *)&itx->itx_lr; + if (write_state == WR_COPIED && dmu_read(zv->zv_objset, + ZVOL_OBJ, offset, len, lr+1, DMU_READ_NO_PREFETCH) != 0) { + zil_itx_destroy(itx); + itx = zil_itx_create(TX_WRITE, sizeof (*lr)); + lr = (lr_write_t *)&itx->itx_lr; + write_state = WR_NEED_COPY; + } + + itx->itx_wr_state = write_state; + if (write_state == WR_NEED_COPY) + itx->itx_sod += len; + lr->lr_foid = ZVOL_OBJ; + lr->lr_offset = offset; + lr->lr_length = len; + lr->lr_blkoff = 0; + BP_ZERO(&lr->lr_blkptr); + + itx->itx_private = zv; + itx->itx_sync = sync; + + (void) zil_itx_assign(zilog, itx, tx); + + offset += len; + size -= len; + } +} + +/* + * Common write path running under the zvol taskq context. This function + * is responsible for copying the request structure data in to the DMU and + * signaling the request queue with the result of the copy. + */ +static void +zvol_write(void *arg) +{ + struct request *req = (struct request *)arg; + struct request_queue *q = req->q; + zvol_state_t *zv = q->queuedata; + uint64_t offset = blk_rq_pos(req) << 9; + uint64_t size = blk_rq_bytes(req); + int error = 0; + dmu_tx_t *tx; + rl_t *rl; + + rl = zfs_range_lock(&zv->zv_znode, offset, size, RL_WRITER); + + tx = dmu_tx_create(zv->zv_objset); + dmu_tx_hold_write(tx, ZVOL_OBJ, offset, size); + + /* This will only fail for ENOSPC */ + error = dmu_tx_assign(tx, TXG_WAIT); + if (error) { + dmu_tx_abort(tx); + zfs_range_unlock(rl); + blk_end_request(req, -error, size); + return; + } + + error = dmu_write_req(zv->zv_objset, ZVOL_OBJ, req, tx); + if (error == 0) + zvol_log_write(zv, tx, offset, size, rq_is_sync(req)); + + dmu_tx_commit(tx); + zfs_range_unlock(rl); + + if (rq_is_sync(req)) + zil_commit(zv->zv_zilog, ZVOL_OBJ); + + blk_end_request(req, -error, size); +} + +/* + * Common read path running under the zvol taskq context. This function + * is responsible for copying the requested data out of the DMU and in to + * a linux request structure. It then must signal the request queue with + * an error code describing the result of the copy. + */ +static void +zvol_read(void *arg) +{ + struct request *req = (struct request *)arg; + struct request_queue *q = req->q; + zvol_state_t *zv = q->queuedata; + uint64_t offset = blk_rq_pos(req) << 9; + uint64_t size = blk_rq_bytes(req); + int error; + rl_t *rl; + + rl = zfs_range_lock(&zv->zv_znode, offset, size, RL_READER); + + error = dmu_read_req(zv->zv_objset, ZVOL_OBJ, req); + + zfs_range_unlock(rl); + + /* convert checksum errors into IO errors */ + if (error == ECKSUM) + error = EIO; + + blk_end_request(req, -error, size); +} + +/* + * Request will be added back to the request queue and retried if + * it cannot be immediately dispatched to the taskq for handling + */ +static inline void +zvol_dispatch(task_func_t func, struct request *req) +{ + if (!taskq_dispatch(zvol_taskq, func, (void *)req, TQ_NOSLEEP)) + blk_requeue_request(req->q, req); +} + +/* + * Common request path. Rather than registering a custom make_request() + * function we use the generic Linux version. This is done because it allows + * us to easily merge read requests which would otherwise we performed + * synchronously by the DMU. This is less critical in write case where the + * DMU will perform the correct merging within a transaction group. Using + * the generic make_request() also let's use leverage the fact that the + * elevator with ensure correct ordering in regards to barrior IOs. On + * the downside it means that in the write case we end up doing request + * merging twice once in the elevator and once in the DMU. + * + * The request handler is called under a spin lock so all the real work + * is handed off to be done in the context of the zvol taskq. This function + * simply performs basic request sanity checking and hands off the request. + */ +static void +zvol_request(struct request_queue *q) +{ + zvol_state_t *zv = q->queuedata; + struct request *req; + unsigned int size; + + while ((req = blk_fetch_request(q)) != NULL) { + size = blk_rq_bytes(req); + + if (blk_rq_pos(req) + blk_rq_sectors(req) > + get_capacity(zv->zv_disk)) { + printk(KERN_INFO + "%s: bad access: block=%llu, count=%lu\n", + req->rq_disk->disk_name, + (long long unsigned)blk_rq_pos(req), + (long unsigned)blk_rq_sectors(req)); + __blk_end_request(req, -EIO, size); + continue; + } + + if (!blk_fs_request(req)) { + printk(KERN_INFO "%s: non-fs cmd\n", + req->rq_disk->disk_name); + __blk_end_request(req, -EIO, size); + continue; + } + + switch (rq_data_dir(req)) { + case READ: + zvol_dispatch(zvol_read, req); + break; + case WRITE: + if (unlikely(get_disk_ro(zv->zv_disk)) || + unlikely(zv->zv_flags & ZVOL_RDONLY)) { + __blk_end_request(req, -EROFS, size); + break; + } + + zvol_dispatch(zvol_write, req); + break; + default: + printk(KERN_INFO "%s: unknown cmd: %d\n", + req->rq_disk->disk_name, (int)rq_data_dir(req)); + __blk_end_request(req, -EIO, size); + break; + } + } +} + +static void +zvol_get_done(zgd_t *zgd, int error) +{ + if (zgd->zgd_db) + dmu_buf_rele(zgd->zgd_db, zgd); + + zfs_range_unlock(zgd->zgd_rl); + + if (error == 0 && zgd->zgd_bp) + zil_add_block(zgd->zgd_zilog, zgd->zgd_bp); + + kmem_free(zgd, sizeof (zgd_t)); +} + +/* + * Get data to generate a TX_WRITE intent log record. + */ +static int +zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio) +{ + zvol_state_t *zv = arg; + objset_t *os = zv->zv_objset; + uint64_t offset = lr->lr_offset; + uint64_t size = lr->lr_length; + dmu_buf_t *db; + zgd_t *zgd; + int error; + + ASSERT(zio != NULL); + ASSERT(size != 0); + + zgd = (zgd_t *)kmem_zalloc(sizeof (zgd_t), KM_SLEEP); + zgd->zgd_zilog = zv->zv_zilog; + zgd->zgd_rl = zfs_range_lock(&zv->zv_znode, offset, size, RL_READER); + + /* + * Write records come in two flavors: immediate and indirect. + * For small writes it's cheaper to store the data with the + * log record (immediate); for large writes it's cheaper to + * sync the data and get a pointer to it (indirect) so that + * we don't have to write the data twice. + */ + if (buf != NULL) { /* immediate write */ + error = dmu_read(os, ZVOL_OBJ, offset, size, buf, + DMU_READ_NO_PREFETCH); + } else { + size = zv->zv_volblocksize; + offset = P2ALIGN_TYPED(offset, size, uint64_t); + error = dmu_buf_hold(os, ZVOL_OBJ, offset, zgd, &db, + DMU_READ_NO_PREFETCH); + if (error == 0) { + zgd->zgd_db = db; + zgd->zgd_bp = &lr->lr_blkptr; + + ASSERT(db != NULL); + ASSERT(db->db_offset == offset); + ASSERT(db->db_size == size); + + error = dmu_sync(zio, lr->lr_common.lrc_txg, + zvol_get_done, zgd); + + if (error == 0) + return (0); + } + } + + zvol_get_done(zgd, error); + + return (error); +} + +/* + * The zvol_state_t's are inserted in increasing MINOR(dev_t) order. + */ +static void +zvol_insert(zvol_state_t *zv_insert) +{ + zvol_state_t *zv = NULL; + + ASSERT(MUTEX_HELD(&zvol_state_lock)); + ASSERT3U(MINOR(zv_insert->zv_dev) & ZVOL_MINOR_MASK, ==, 0); + for (zv = list_head(&zvol_state_list); zv != NULL; + zv = list_next(&zvol_state_list, zv)) { + if (MINOR(zv->zv_dev) > MINOR(zv_insert->zv_dev)) + break; + } + + list_insert_before(&zvol_state_list, zv, zv_insert); +} + +/* + * Simply remove the zvol from to list of zvols. + */ +static void +zvol_remove(zvol_state_t *zv_remove) +{ + ASSERT(MUTEX_HELD(&zvol_state_lock)); + list_remove(&zvol_state_list, zv_remove); +} + +static int +zvol_first_open(zvol_state_t *zv) +{ + objset_t *os; + uint64_t volsize; + int error; + uint64_t ro; + + /* lie and say we're read-only */ + error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, 1, zvol_tag, &os); + if (error) + return (-error); + + error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); + if (error) { + dmu_objset_disown(os, zvol_tag); + return (-error); + } + + zv->zv_objset = os; + error = dmu_bonus_hold(os, ZVOL_OBJ, zvol_tag, &zv->zv_dbuf); + if (error) { + dmu_objset_disown(os, zvol_tag); + return (-error); + } + + set_capacity(zv->zv_disk, volsize >> 9); + zv->zv_volsize = volsize; + zv->zv_zilog = zil_open(os, zvol_get_data); + + VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &ro, NULL) == 0); + if (ro || dmu_objset_is_snapshot(os)) { + set_disk_ro(zv->zv_disk, 1); + zv->zv_flags |= ZVOL_RDONLY; + } else { + set_disk_ro(zv->zv_disk, 0); + zv->zv_flags &= ~ZVOL_RDONLY; + } + + return (-error); +} + +static void +zvol_last_close(zvol_state_t *zv) +{ + zil_close(zv->zv_zilog); + zv->zv_zilog = NULL; + dmu_buf_rele(zv->zv_dbuf, zvol_tag); + zv->zv_dbuf = NULL; + dmu_objset_disown(zv->zv_objset, zvol_tag); + zv->zv_objset = NULL; +} + +static int +zvol_open(struct block_device *bdev, fmode_t flag) +{ + zvol_state_t *zv = bdev->bd_disk->private_data; + int error = 0, drop_mutex = 0; + + /* + * If the caller is already holding the mutex do not take it + * again, this will happen as part of zvol_create_minor(). + * Once add_disk() is called the device is live and the kernel + * will attempt to open it to read the partition information. + */ + if (!mutex_owned(&zvol_state_lock)) { + mutex_enter(&zvol_state_lock); + drop_mutex = 1; + } + + ASSERT3P(zv, !=, NULL); + + if (zv->zv_open_count == 0) { + error = zvol_first_open(zv); + if (error) + goto out_mutex; + } + + if ((flag & FMODE_WRITE) && + (get_disk_ro(zv->zv_disk) || (zv->zv_flags & ZVOL_RDONLY))) { + error = -EROFS; + goto out_open_count; + } + + zv->zv_open_count++; + +out_open_count: + if (zv->zv_open_count == 0) + zvol_last_close(zv); + +out_mutex: + if (drop_mutex) + mutex_exit(&zvol_state_lock); + + check_disk_change(bdev); + + return (error); +} + +static int +zvol_release(struct gendisk *disk, fmode_t mode) +{ + zvol_state_t *zv = disk->private_data; + int drop_mutex = 0; + + if (!mutex_owned(&zvol_state_lock)) { + mutex_enter(&zvol_state_lock); + drop_mutex = 1; + } + + ASSERT3P(zv, !=, NULL); + ASSERT3U(zv->zv_open_count, >, 0); + zv->zv_open_count--; + if (zv->zv_open_count == 0) + zvol_last_close(zv); + + if (drop_mutex) + mutex_exit(&zvol_state_lock); + + return (0); +} + +static int +zvol_ioctl(struct block_device *bdev, fmode_t mode, + unsigned int cmd, unsigned long arg) +{ + zvol_state_t *zv = bdev->bd_disk->private_data; + int error = 0; + + if (zv == NULL) + return (-ENXIO); + + switch (cmd) { + case BLKFLSBUF: + zil_commit(zv->zv_zilog, ZVOL_OBJ); + break; + + default: + error = -ENOTTY; + break; + + } + + return (error); +} + +#ifdef CONFIG_COMPAT +static int +zvol_compat_ioctl(struct block_device *bdev, fmode_t mode, + unsigned cmd, unsigned long arg) +{ + return zvol_ioctl(bdev, mode, cmd, arg); +} +#else +#define zvol_compat_ioctl NULL +#endif + +static int zvol_media_changed(struct gendisk *disk) +{ + zvol_state_t *zv = disk->private_data; + + return zv->zv_changed; +} + +static int zvol_revalidate_disk(struct gendisk *disk) +{ + zvol_state_t *zv = disk->private_data; + + zv->zv_changed = 0; + set_capacity(zv->zv_disk, zv->zv_volsize >> 9); + + return 0; +} + +/* + * Provide a simple virtual geometry for legacy compatibility. For devices + * smaller than 1 MiB a small head and sector count is used to allow very + * tiny devices. For devices over 1 Mib a standard head and sector count + * is used to keep the cylinders count reasonable. + */ +static int +zvol_getgeo(struct block_device *bdev, struct hd_geometry *geo) +{ + zvol_state_t *zv = bdev->bd_disk->private_data; + sector_t sectors = get_capacity(zv->zv_disk); + + if (sectors > 2048) { + geo->heads = 16; + geo->sectors = 63; + } else { + geo->heads = 2; + geo->sectors = 4; + } + + geo->start = 0; + geo->cylinders = sectors / (geo->heads * geo->sectors); + + return 0; +} + +static struct kobject * +zvol_probe(dev_t dev, int *part, void *arg) +{ + zvol_state_t *zv; + struct kobject *kobj; + + mutex_enter(&zvol_state_lock); + zv = zvol_find_by_dev(dev); + kobj = zv ? get_disk(zv->zv_disk) : ERR_PTR(-ENOENT); + mutex_exit(&zvol_state_lock); + + return kobj; +} + +#ifdef HAVE_BDEV_BLOCK_DEVICE_OPERATIONS +static struct block_device_operations zvol_ops = { + .open = zvol_open, + .release = zvol_release, + .ioctl = zvol_ioctl, + .compat_ioctl = zvol_compat_ioctl, + .media_changed = zvol_media_changed, + .revalidate_disk = zvol_revalidate_disk, + .getgeo = zvol_getgeo, + .owner = THIS_MODULE, +}; + +#else /* HAVE_BDEV_BLOCK_DEVICE_OPERATIONS */ + +static int +zvol_open_by_inode(struct inode *inode, struct file *file) +{ + return zvol_open(inode->i_bdev, file->f_mode); +} + +static int +zvol_release_by_inode(struct inode *inode, struct file *file) +{ + return zvol_release(inode->i_bdev->bd_disk, file->f_mode); +} + +static int +zvol_ioctl_by_inode(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + return zvol_ioctl(inode->i_bdev, file->f_mode, cmd, arg); +} + +# ifdef CONFIG_COMPAT +static long +zvol_compat_ioctl_by_inode(struct file *file, + unsigned int cmd, unsigned long arg) +{ + return zvol_compat_ioctl(file->f_dentry->d_inode->i_bdev, + file->f_mode, cmd, arg); +} +# else +# define zvol_compat_ioctl_by_inode NULL +# endif + +static struct block_device_operations zvol_ops = { + .open = zvol_open_by_inode, + .release = zvol_release_by_inode, + .ioctl = zvol_ioctl_by_inode, + .compat_ioctl = zvol_compat_ioctl_by_inode, + .media_changed = zvol_media_changed, + .revalidate_disk = zvol_revalidate_disk, + .getgeo = zvol_getgeo, + .owner = THIS_MODULE, +}; +#endif /* HAVE_BDEV_BLOCK_DEVICE_OPERATIONS */ + +/* + * Allocate memory for a new zvol_state_t and setup the required + * request queue and generic disk structures for the block device. + */ +static zvol_state_t * +zvol_alloc(dev_t dev, const char *name) +{ + zvol_state_t *zv; + + zv = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP); + if (zv == NULL) + goto out; + + zv->zv_queue = blk_init_queue(zvol_request, &zv->zv_lock); + if (zv->zv_queue == NULL) + goto out_kmem; + + zv->zv_disk = alloc_disk(ZVOL_MINORS); + if (zv->zv_disk == NULL) + goto out_queue; + + zv->zv_queue->queuedata = zv; + zv->zv_dev = dev; + zv->zv_open_count = 0; + strlcpy(zv->zv_name, name, DISK_NAME_LEN); + + mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL); + avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare, + sizeof (rl_t), offsetof(rl_t, r_node)); + spin_lock_init(&zv->zv_lock); + list_link_init(&zv->zv_next); + + zv->zv_disk->major = zvol_major; + zv->zv_disk->first_minor = (dev & MINORMASK); + zv->zv_disk->fops = &zvol_ops; + zv->zv_disk->private_data = zv; + zv->zv_disk->queue = zv->zv_queue; + snprintf(zv->zv_disk->disk_name, DISK_NAME_LEN, "%s", name); + + return zv; + +out_queue: + blk_cleanup_queue(zv->zv_queue); +out_kmem: + kmem_free(zv, sizeof (zvol_state_t)); +out: + return NULL; +} + +/* + * Cleanup then free a zvol_state_t which was created by zvol_alloc(). + */ +static void +zvol_free(zvol_state_t *zv) +{ + avl_destroy(&zv->zv_znode.z_range_avl); + mutex_destroy(&zv->zv_znode.z_range_lock); + + del_gendisk(zv->zv_disk); + blk_cleanup_queue(zv->zv_queue); + put_disk(zv->zv_disk); + + kmem_free(zv, sizeof (zvol_state_t)); +} + +static int +__zvol_create_minor(const char *name) +{ + zvol_state_t *zv; + objset_t *os; + dmu_object_info_t *doi; + uint64_t volsize; + unsigned minor = 0; + int error = 0; + + ASSERT(MUTEX_HELD(&zvol_state_lock)); + + zv = zvol_find_by_name(name); + if (zv) { + error = EEXIST; + goto out; + } + + doi = kmem_alloc(sizeof(dmu_object_info_t), KM_SLEEP); + + error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, zvol_tag, &os); + if (error) + goto out_doi; + + error = dmu_object_info(os, ZVOL_OBJ, doi); + if (error) + goto out_dmu_objset_disown; + + error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); + if (error) + goto out_dmu_objset_disown; + + error = zvol_find_minor(&minor); + if (error) + goto out_dmu_objset_disown; + + zv = zvol_alloc(MKDEV(zvol_major, minor), name); + if (zv == NULL) { + error = EAGAIN; + goto out_dmu_objset_disown; + } + + if (dmu_objset_is_snapshot(os)) + zv->zv_flags |= ZVOL_RDONLY; + + zv->zv_volblocksize = doi->doi_data_block_size; + zv->zv_volsize = volsize; + zv->zv_objset = os; + + set_capacity(zv->zv_disk, zv->zv_volsize >> 9); + + if (zil_replay_disable) + zil_destroy(dmu_objset_zil(os), B_FALSE); + else + zil_replay(os, zv, zvol_replay_vector); + +out_dmu_objset_disown: + dmu_objset_disown(os, zvol_tag); + zv->zv_objset = NULL; +out_doi: + kmem_free(doi, sizeof(dmu_object_info_t)); +out: + + if (error == 0) { + zvol_insert(zv); + add_disk(zv->zv_disk); + } + + return (error); +} + +/* + * Create a block device minor node and setup the linkage between it + * and the specified volume. Once this function returns the block + * device is live and ready for use. + */ +int +zvol_create_minor(const char *name) +{ + int error; + + mutex_enter(&zvol_state_lock); + error = __zvol_create_minor(name); + mutex_exit(&zvol_state_lock); + + return (error); +} + +static int +__zvol_remove_minor(const char *name) +{ + zvol_state_t *zv; + + ASSERT(MUTEX_HELD(&zvol_state_lock)); + + zv = zvol_find_by_name(name); + if (zv == NULL) + return (ENXIO); + + if (zv->zv_open_count > 0) + return (EBUSY); + + zvol_remove(zv); + zvol_free(zv); + + return (0); +} + +/* + * Remove a block device minor node for the specified volume. + */ +int +zvol_remove_minor(const char *name) +{ + int error; + + mutex_enter(&zvol_state_lock); + error = __zvol_remove_minor(name); + mutex_exit(&zvol_state_lock); + + return (error); +} + +static int +zvol_create_minors_cb(spa_t *spa, uint64_t dsobj, + const char *dsname, void *arg) +{ + if (strchr(dsname, '/') == NULL) + return 0; + + return __zvol_create_minor(dsname); +} + +/* + * Create minors for specified pool, if pool is NULL create minors + * for all available pools. + */ +int +zvol_create_minors(const char *pool) +{ + spa_t *spa = NULL; + int error = 0; + + mutex_enter(&zvol_state_lock); + if (pool) { + error = dmu_objset_find_spa(NULL, pool, zvol_create_minors_cb, + NULL, DS_FIND_CHILDREN | DS_FIND_SNAPSHOTS); + } else { + mutex_enter(&spa_namespace_lock); + while ((spa = spa_next(spa)) != NULL) { + error = dmu_objset_find_spa(NULL, + spa_name(spa), zvol_create_minors_cb, NULL, + DS_FIND_CHILDREN | DS_FIND_SNAPSHOTS); + if (error) + break; + } + mutex_exit(&spa_namespace_lock); + } + mutex_exit(&zvol_state_lock); + + return error; +} + +/* + * Remove minors for specified pool, if pool is NULL remove all minors. + */ +void +zvol_remove_minors(const char *pool) +{ + zvol_state_t *zv, *zv_next; + char *str; + + str = kmem_zalloc(DISK_NAME_LEN, KM_SLEEP); + if (pool) { + (void) strncpy(str, pool, strlen(pool)); + (void) strcat(str, "/"); + } + + mutex_enter(&zvol_state_lock); + for (zv = list_head(&zvol_state_list); zv != NULL; zv = zv_next) { + zv_next = list_next(&zvol_state_list, zv); + + if (pool == NULL || !strncmp(str, zv->zv_name, strlen(str))) { + zvol_remove(zv); + zvol_free(zv); + } + } + mutex_exit(&zvol_state_lock); + kmem_free(str, DISK_NAME_LEN); +} + +int +zvol_init(void) +{ + int error; + + if (!zvol_threads) + zvol_threads = num_online_cpus(); + + zvol_taskq = taskq_create(ZVOL_DRIVER, zvol_threads, maxclsyspri, + zvol_threads, INT_MAX, TASKQ_PREPOPULATE); + if (zvol_taskq == NULL) { + printk(KERN_INFO "ZFS: taskq_create() failed\n"); + return (-ENOMEM); + } + + error = register_blkdev(zvol_major, ZVOL_DRIVER); + if (error) { + printk(KERN_INFO "ZFS: register_blkdev() failed %d\n", error); + taskq_destroy(zvol_taskq); + return (error); + } + + blk_register_region(MKDEV(zvol_major, 0), 1UL << MINORBITS, + THIS_MODULE, zvol_probe, NULL, NULL); + + mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL); + list_create(&zvol_state_list, sizeof (zvol_state_t), + offsetof(zvol_state_t, zv_next)); + + (void) zvol_create_minors(NULL); + + return (0); +} + +void +zvol_fini(void) +{ + zvol_remove_minors(NULL); + blk_unregister_region(MKDEV(zvol_major, 0), 1UL << MINORBITS); + unregister_blkdev(zvol_major, ZVOL_DRIVER); + taskq_destroy(zvol_taskq); + mutex_destroy(&zvol_state_lock); + list_destroy(&zvol_state_list); +} + +module_param(zvol_major, uint, 0); +MODULE_PARM_DESC(zvol_major, "Major number for zvol device"); + +module_param(zvol_threads, uint, 0); +MODULE_PARM_DESC(zvol_threads, "Number of threads for zvol device"); -- 1.8.3.1