diff options
author | Christoph Hellwig <hch@lst.de> | 2019-01-29 09:32:30 +0100 |
---|---|---|
committer | Martin K. Petersen <martin.petersen@oracle.com> | 2019-02-05 21:28:13 -0500 |
commit | 80f2121380caa14895638b24b81800158c0844f2 (patch) | |
tree | fb042eef94e895eb93deb9a64de783e12272115c /fs/exofs/super.c | |
parent | 972248e9111ee6fe9fb56c24ecfd7434f3d713ac (diff) |
scsi: fs: remove exofs
This was an example for using the SCSI OSD protocol, which we're trying
to remove.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'fs/exofs/super.c')
-rw-r--r-- | fs/exofs/super.c | 1071 |
1 files changed, 0 insertions, 1071 deletions
diff --git a/fs/exofs/super.c b/fs/exofs/super.c deleted file mode 100644 index fc80c7233fa5..000000000000 --- a/fs/exofs/super.c +++ /dev/null @@ -1,1071 +0,0 @@ -/* - * Copyright (C) 2005, 2006 - * Avishay Traeger (avishay@gmail.com) - * Copyright (C) 2008, 2009 - * Boaz Harrosh <ooo@electrozaur.com> - * - * Copyrights for code taken from ext2: - * Copyright (C) 1992, 1993, 1994, 1995 - * Remy Card (card@masi.ibp.fr) - * Laboratoire MASI - Institut Blaise Pascal - * Universite Pierre et Marie Curie (Paris VI) - * from - * linux/fs/minix/inode.c - * Copyright (C) 1991, 1992 Linus Torvalds - * - * This file is part of exofs. - * - * exofs is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation. Since it is based on ext2, and the only - * valid version of GPL for the Linux kernel is version 2, the only valid - * version of GPL for exofs is version 2. - * - * exofs is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with exofs; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#include <linux/string.h> -#include <linux/parser.h> -#include <linux/vfs.h> -#include <linux/random.h> -#include <linux/module.h> -#include <linux/exportfs.h> -#include <linux/slab.h> -#include <linux/iversion.h> - -#include "exofs.h" - -#define EXOFS_DBGMSG2(M...) do {} while (0) - -/****************************************************************************** - * MOUNT OPTIONS - *****************************************************************************/ - -/* - * struct to hold what we get from mount options - */ -struct exofs_mountopt { - bool is_osdname; - const char *dev_name; - uint64_t pid; - int timeout; -}; - -/* - * exofs-specific mount-time options. - */ -enum { Opt_name, Opt_pid, Opt_to, Opt_err }; - -/* - * Our mount-time options. These should ideally be 64-bit unsigned, but the - * kernel's parsing functions do not currently support that. 32-bit should be - * sufficient for most applications now. - */ -static match_table_t tokens = { - {Opt_name, "osdname=%s"}, - {Opt_pid, "pid=%u"}, - {Opt_to, "to=%u"}, - {Opt_err, NULL} -}; - -/* - * The main option parsing method. Also makes sure that all of the mandatory - * mount options were set. - */ -static int parse_options(char *options, struct exofs_mountopt *opts) -{ - char *p; - substring_t args[MAX_OPT_ARGS]; - int option; - bool s_pid = false; - - EXOFS_DBGMSG("parse_options %s\n", options); - /* defaults */ - memset(opts, 0, sizeof(*opts)); - opts->timeout = BLK_DEFAULT_SG_TIMEOUT; - - while ((p = strsep(&options, ",")) != NULL) { - int token; - char str[32]; - - if (!*p) - continue; - - token = match_token(p, tokens, args); - switch (token) { - case Opt_name: - kfree(opts->dev_name); - opts->dev_name = match_strdup(&args[0]); - if (unlikely(!opts->dev_name)) { - EXOFS_ERR("Error allocating dev_name"); - return -ENOMEM; - } - opts->is_osdname = true; - break; - case Opt_pid: - if (0 == match_strlcpy(str, &args[0], sizeof(str))) - return -EINVAL; - opts->pid = simple_strtoull(str, NULL, 0); - if (opts->pid < EXOFS_MIN_PID) { - EXOFS_ERR("Partition ID must be >= %u", - EXOFS_MIN_PID); - return -EINVAL; - } - s_pid = true; - break; - case Opt_to: - if (match_int(&args[0], &option)) - return -EINVAL; - if (option <= 0) { - EXOFS_ERR("Timeout must be > 0"); - return -EINVAL; - } - opts->timeout = option * HZ; - break; - } - } - - if (!s_pid) { - EXOFS_ERR("Need to specify the following options:\n"); - EXOFS_ERR(" -o pid=pid_no_to_use\n"); - return -EINVAL; - } - - return 0; -} - -/****************************************************************************** - * INODE CACHE - *****************************************************************************/ - -/* - * Our inode cache. Isn't it pretty? - */ -static struct kmem_cache *exofs_inode_cachep; - -/* - * Allocate an inode in the cache - */ -static struct inode *exofs_alloc_inode(struct super_block *sb) -{ - struct exofs_i_info *oi; - - oi = kmem_cache_alloc(exofs_inode_cachep, GFP_KERNEL); - if (!oi) - return NULL; - - inode_set_iversion(&oi->vfs_inode, 1); - return &oi->vfs_inode; -} - -static void exofs_i_callback(struct rcu_head *head) -{ - struct inode *inode = container_of(head, struct inode, i_rcu); - kmem_cache_free(exofs_inode_cachep, exofs_i(inode)); -} - -/* - * Remove an inode from the cache - */ -static void exofs_destroy_inode(struct inode *inode) -{ - call_rcu(&inode->i_rcu, exofs_i_callback); -} - -/* - * Initialize the inode - */ -static void exofs_init_once(void *foo) -{ - struct exofs_i_info *oi = foo; - - inode_init_once(&oi->vfs_inode); -} - -/* - * Create and initialize the inode cache - */ -static int init_inodecache(void) -{ - exofs_inode_cachep = kmem_cache_create_usercopy("exofs_inode_cache", - sizeof(struct exofs_i_info), 0, - SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | - SLAB_ACCOUNT, - offsetof(struct exofs_i_info, i_data), - sizeof_field(struct exofs_i_info, i_data), - exofs_init_once); - if (exofs_inode_cachep == NULL) - return -ENOMEM; - return 0; -} - -/* - * Destroy the inode cache - */ -static void destroy_inodecache(void) -{ - /* - * Make sure all delayed rcu free inodes are flushed before we - * destroy cache. - */ - rcu_barrier(); - kmem_cache_destroy(exofs_inode_cachep); -} - -/****************************************************************************** - * Some osd helpers - *****************************************************************************/ -void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj) -{ - osd_sec_init_nosec_doall_caps(cred_a, obj, false, true); -} - -static int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj, - u64 offset, void *p, unsigned length) -{ - struct osd_request *or = osd_start_request(od); -/* struct osd_sense_info osi = {.key = 0};*/ - int ret; - - if (unlikely(!or)) { - EXOFS_DBGMSG("%s: osd_start_request failed.\n", __func__); - return -ENOMEM; - } - ret = osd_req_read_kern(or, obj, offset, p, length); - if (unlikely(ret)) { - EXOFS_DBGMSG("%s: osd_req_read_kern failed.\n", __func__); - goto out; - } - - ret = osd_finalize_request(or, 0, cred, NULL); - if (unlikely(ret)) { - EXOFS_DBGMSG("Failed to osd_finalize_request() => %d\n", ret); - goto out; - } - - ret = osd_execute_request(or); - if (unlikely(ret)) - EXOFS_DBGMSG("osd_execute_request() => %d\n", ret); - /* osd_req_decode_sense(or, ret); */ - -out: - osd_end_request(or); - EXOFS_DBGMSG2("read_kern(0x%llx) offset=0x%llx " - "length=0x%llx dev=%p ret=>%d\n", - _LLU(obj->id), _LLU(offset), _LLU(length), od, ret); - return ret; -} - -static const struct osd_attr g_attr_sb_stats = ATTR_DEF( - EXOFS_APAGE_SB_DATA, - EXOFS_ATTR_SB_STATS, - sizeof(struct exofs_sb_stats)); - -static int __sbi_read_stats(struct exofs_sb_info *sbi) -{ - struct osd_attr attrs[] = { - [0] = g_attr_sb_stats, - }; - struct ore_io_state *ios; - int ret; - - ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios); - if (unlikely(ret)) { - EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__); - return ret; - } - - ios->in_attr = attrs; - ios->in_attr_len = ARRAY_SIZE(attrs); - - ret = ore_read(ios); - if (unlikely(ret)) { - EXOFS_ERR("Error reading super_block stats => %d\n", ret); - goto out; - } - - ret = extract_attr_from_ios(ios, &attrs[0]); - if (ret) { - EXOFS_ERR("%s: extract_attr of sb_stats failed\n", __func__); - goto out; - } - if (attrs[0].len) { - struct exofs_sb_stats *ess; - - if (unlikely(attrs[0].len != sizeof(*ess))) { - EXOFS_ERR("%s: Wrong version of exofs_sb_stats " - "size(%d) != expected(%zd)\n", - __func__, attrs[0].len, sizeof(*ess)); - goto out; - } - - ess = attrs[0].val_ptr; - sbi->s_nextid = le64_to_cpu(ess->s_nextid); - sbi->s_numfiles = le32_to_cpu(ess->s_numfiles); - } - -out: - ore_put_io_state(ios); - return ret; -} - -static void stats_done(struct ore_io_state *ios, void *p) -{ - ore_put_io_state(ios); - /* Good thanks nothing to do anymore */ -} - -/* Asynchronously write the stats attribute */ -int exofs_sbi_write_stats(struct exofs_sb_info *sbi) -{ - struct osd_attr attrs[] = { - [0] = g_attr_sb_stats, - }; - struct ore_io_state *ios; - int ret; - - ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios); - if (unlikely(ret)) { - EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__); - return ret; - } - - sbi->s_ess.s_nextid = cpu_to_le64(sbi->s_nextid); - sbi->s_ess.s_numfiles = cpu_to_le64(sbi->s_numfiles); - attrs[0].val_ptr = &sbi->s_ess; - - - ios->done = stats_done; - ios->private = sbi; - ios->out_attr = attrs; - ios->out_attr_len = ARRAY_SIZE(attrs); - - ret = ore_write(ios); - if (unlikely(ret)) { - EXOFS_ERR("%s: ore_write failed.\n", __func__); - ore_put_io_state(ios); - } - - return ret; -} - -/****************************************************************************** - * SUPERBLOCK FUNCTIONS - *****************************************************************************/ -static const struct super_operations exofs_sops; -static const struct export_operations exofs_export_ops; - -/* - * Write the superblock to the OSD - */ -static int exofs_sync_fs(struct super_block *sb, int wait) -{ - struct exofs_sb_info *sbi; - struct exofs_fscb *fscb; - struct ore_comp one_comp; - struct ore_components oc; - struct ore_io_state *ios; - int ret = -ENOMEM; - - fscb = kmalloc(sizeof(*fscb), GFP_KERNEL); - if (unlikely(!fscb)) - return -ENOMEM; - - sbi = sb->s_fs_info; - - /* NOTE: We no longer dirty the super_block anywhere in exofs. The - * reason we write the fscb here on unmount is so we can stay backwards - * compatible with fscb->s_version == 1. (What we are not compatible - * with is if a new version FS crashed and then we try to mount an old - * version). Otherwise the exofs_fscb is read-only from mkfs time. All - * the writeable info is set in exofs_sbi_write_stats() above. - */ - - exofs_init_comps(&oc, &one_comp, sbi, EXOFS_SUPER_ID); - - ret = ore_get_io_state(&sbi->layout, &oc, &ios); - if (unlikely(ret)) - goto out; - - ios->length = offsetof(struct exofs_fscb, s_dev_table_oid); - memset(fscb, 0, ios->length); - fscb->s_nextid = cpu_to_le64(sbi->s_nextid); - fscb->s_numfiles = cpu_to_le64(sbi->s_numfiles); - fscb->s_magic = cpu_to_le16(sb->s_magic); - fscb->s_newfs = 0; - fscb->s_version = EXOFS_FSCB_VER; - - ios->offset = 0; - ios->kern_buff = fscb; - - ret = ore_write(ios); - if (unlikely(ret)) - EXOFS_ERR("%s: ore_write failed.\n", __func__); - -out: - EXOFS_DBGMSG("s_nextid=0x%llx ret=%d\n", _LLU(sbi->s_nextid), ret); - ore_put_io_state(ios); - kfree(fscb); - return ret; -} - -static void _exofs_print_device(const char *msg, const char *dev_path, - struct osd_dev *od, u64 pid) -{ - const struct osd_dev_info *odi = osduld_device_info(od); - - printk(KERN_NOTICE "exofs: %s %s osd_name-%s pid-0x%llx\n", - msg, dev_path ?: "", odi->osdname, _LLU(pid)); -} - -static void exofs_free_sbi(struct exofs_sb_info *sbi) -{ - unsigned numdevs = sbi->oc.numdevs; - - while (numdevs) { - unsigned i = --numdevs; - struct osd_dev *od = ore_comp_dev(&sbi->oc, i); - - if (od) { - ore_comp_set_dev(&sbi->oc, i, NULL); - osduld_put_device(od); - } - } - kfree(sbi->oc.ods); - kfree(sbi); -} - -/* - * This function is called when the vfs is freeing the superblock. We just - * need to free our own part. - */ -static void exofs_put_super(struct super_block *sb) -{ - int num_pend; - struct exofs_sb_info *sbi = sb->s_fs_info; - - /* make sure there are no pending commands */ - for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0; - num_pend = atomic_read(&sbi->s_curr_pending)) { - wait_queue_head_t wq; - - printk(KERN_NOTICE "%s: !!Pending operations in flight. " - "This is a BUG. please report to osd-dev@open-osd.org\n", - __func__); - init_waitqueue_head(&wq); - wait_event_timeout(wq, - (atomic_read(&sbi->s_curr_pending) == 0), - msecs_to_jiffies(100)); - } - - _exofs_print_device("Unmounting", NULL, ore_comp_dev(&sbi->oc, 0), - sbi->one_comp.obj.partition); - - exofs_sysfs_sb_del(sbi); - exofs_free_sbi(sbi); - sb->s_fs_info = NULL; -} - -static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs, - struct exofs_device_table *dt) -{ - int ret; - - sbi->layout.stripe_unit = - le64_to_cpu(dt->dt_data_map.cb_stripe_unit); - sbi->layout.group_width = - le32_to_cpu(dt->dt_data_map.cb_group_width); - sbi->layout.group_depth = - le32_to_cpu(dt->dt_data_map.cb_group_depth); - sbi->layout.mirrors_p1 = - le32_to_cpu(dt->dt_data_map.cb_mirror_cnt) + 1; - sbi->layout.raid_algorithm = - le32_to_cpu(dt->dt_data_map.cb_raid_algorithm); - - ret = ore_verify_layout(numdevs, &sbi->layout); - - EXOFS_DBGMSG("exofs: layout: " - "num_comps=%u stripe_unit=0x%x group_width=%u " - "group_depth=0x%llx mirrors_p1=%u raid_algorithm=%u\n", - numdevs, - sbi->layout.stripe_unit, - sbi->layout.group_width, - _LLU(sbi->layout.group_depth), - sbi->layout.mirrors_p1, - sbi->layout.raid_algorithm); - return ret; -} - -static unsigned __ra_pages(struct ore_layout *layout) -{ - const unsigned _MIN_RA = 32; /* min 128K read-ahead */ - unsigned ra_pages = layout->group_width * layout->stripe_unit / - PAGE_SIZE; - unsigned max_io_pages = exofs_max_io_pages(layout, ~0); - - ra_pages *= 2; /* two stripes */ - if (ra_pages < _MIN_RA) - ra_pages = roundup(_MIN_RA, ra_pages / 2); - - if (ra_pages > max_io_pages) - ra_pages = max_io_pages; - - return ra_pages; -} - -/* @odi is valid only as long as @fscb_dev is valid */ -static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev, - struct osd_dev_info *odi) -{ - odi->systemid_len = le32_to_cpu(dt_dev->systemid_len); - if (likely(odi->systemid_len)) - memcpy(odi->systemid, dt_dev->systemid, OSD_SYSTEMID_LEN); - - odi->osdname_len = le32_to_cpu(dt_dev->osdname_len); - odi->osdname = dt_dev->osdname; - - /* FIXME support long names. Will need a _put function */ - if (dt_dev->long_name_offset) - return -EINVAL; - - /* Make sure osdname is printable! - * mkexofs should give us space for a null-terminator else the - * device-table is invalid. - */ - if (unlikely(odi->osdname_len >= sizeof(dt_dev->osdname))) - odi->osdname_len = sizeof(dt_dev->osdname) - 1; - dt_dev->osdname[odi->osdname_len] = 0; - - /* If it's all zeros something is bad we read past end-of-obj */ - return !(odi->systemid_len || odi->osdname_len); -} - -static int __alloc_dev_table(struct exofs_sb_info *sbi, unsigned numdevs, - struct exofs_dev **peds) -{ - /* Twice bigger table: See exofs_init_comps() and comment at - * exofs_read_lookup_dev_table() - */ - const size_t numores = numdevs * 2 - 1; - struct exofs_dev *eds; - unsigned i; - - sbi->oc.ods = kzalloc(numores * sizeof(struct ore_dev *) + - numdevs * sizeof(struct exofs_dev), GFP_KERNEL); - if (unlikely(!sbi->oc.ods)) { - EXOFS_ERR("ERROR: failed allocating Device array[%d]\n", - numdevs); - return -ENOMEM; - } - - /* Start of allocated struct exofs_dev entries */ - *peds = eds = (void *)sbi->oc.ods[numores]; - /* Initialize pointers into struct exofs_dev */ - for (i = 0; i < numdevs; ++i) - sbi->oc.ods[i] = &eds[i].ored; - return 0; -} - -static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi, - struct osd_dev *fscb_od, - unsigned table_count) -{ - struct ore_comp comp; - struct exofs_device_table *dt; - struct exofs_dev *eds; - unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) + - sizeof(*dt); - unsigned numdevs, i; - int ret; - - dt = kmalloc(table_bytes, GFP_KERNEL); - if (unlikely(!dt)) { - EXOFS_ERR("ERROR: allocating %x bytes for device table\n", - table_bytes); - return -ENOMEM; - } - - sbi->oc.numdevs = 0; - - comp.obj.partition = sbi->one_comp.obj.partition; - comp.obj.id = EXOFS_DEVTABLE_ID; - exofs_make_credential(comp.cred, &comp.obj); - - ret = exofs_read_kern(fscb_od, comp.cred, &comp.obj, 0, dt, - table_bytes); - if (unlikely(ret)) { - EXOFS_ERR("ERROR: reading device table\n"); - goto out; - } - - numdevs = le64_to_cpu(dt->dt_num_devices); - if (unlikely(!numdevs)) { - ret = -EINVAL; - goto out; - } - WARN_ON(table_count != numdevs); - - ret = _read_and_match_data_map(sbi, numdevs, dt); - if (unlikely(ret)) - goto out; - - ret = __alloc_dev_table(sbi, numdevs, &eds); - if (unlikely(ret)) - goto out; - /* exofs round-robins the device table view according to inode - * number. We hold a: twice bigger table hence inodes can point - * to any device and have a sequential view of the table - * starting at this device. See exofs_init_comps() - */ - memcpy(&sbi->oc.ods[numdevs], &sbi->oc.ods[0], - (numdevs - 1) * sizeof(sbi->oc.ods[0])); - - /* create sysfs subdir under which we put the device table - * And cluster layout. A Superblock is identified by the string: - * "dev[0].osdname"_"pid" - */ - exofs_sysfs_sb_add(sbi, &dt->dt_dev_table[0]); - - for (i = 0; i < numdevs; i++) { - struct exofs_fscb fscb; - struct osd_dev_info odi; - struct osd_dev *od; - - if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) { - EXOFS_ERR("ERROR: Read all-zeros device entry\n"); - ret = -EINVAL; - goto out; - } - - printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n", - i, odi.osdname); - - /* the exofs id is currently the table index */ - eds[i].did = i; - - /* On all devices the device table is identical. The user can - * specify any one of the participating devices on the command - * line. We always keep them in device-table order. - */ - if (fscb_od && osduld_device_same(fscb_od, &odi)) { - eds[i].ored.od = fscb_od; - ++sbi->oc.numdevs; - fscb_od = NULL; - exofs_sysfs_odev_add(&eds[i], sbi); - continue; - } - - od = osduld_info_lookup(&odi); - if (IS_ERR(od)) { - ret = PTR_ERR(od); - EXOFS_ERR("ERROR: device requested is not found " - "osd_name-%s =>%d\n", odi.osdname, ret); - goto out; - } - - eds[i].ored.od = od; - ++sbi->oc.numdevs; - - /* Read the fscb of the other devices to make sure the FS - * partition is there. - */ - ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb, - sizeof(fscb)); - if (unlikely(ret)) { - EXOFS_ERR("ERROR: Malformed participating device " - "error reading fscb osd_name-%s\n", - odi.osdname); - goto out; - } - exofs_sysfs_odev_add(&eds[i], sbi); - - /* TODO: verify other information is correct and FS-uuid - * matches. Benny what did you say about device table - * generation and old devices? - */ - } - -out: - kfree(dt); - if (unlikely(fscb_od && !ret)) { - EXOFS_ERR("ERROR: Bad device-table container device not present\n"); - osduld_put_device(fscb_od); - return -EINVAL; - } - return ret; -} - -/* - * Read the superblock from the OSD and fill in the fields - */ -static int exofs_fill_super(struct super_block *sb, - struct exofs_mountopt *opts, - struct exofs_sb_info *sbi, - int silent) -{ - struct inode *root; - struct osd_dev *od; /* Master device */ - struct exofs_fscb fscb; /*on-disk superblock info */ - struct ore_comp comp; - unsigned table_count; - int ret; - - /* use mount options to fill superblock */ - if (opts->is_osdname) { - struct osd_dev_info odi = {.systemid_len = 0}; - - odi.osdname_len = strlen(opts->dev_name); - odi.osdname = (u8 *)opts->dev_name; - od = osduld_info_lookup(&odi); - kfree(opts->dev_name); - opts->dev_name = NULL; - } else { - od = osduld_path_lookup(opts->dev_name); - } - if (IS_ERR(od)) { - ret = -EINVAL; - goto free_sbi; - } - - /* Default layout in case we do not have a device-table */ - sbi->layout.stripe_unit = PAGE_SIZE; - sbi->layout.mirrors_p1 = 1; - sbi->layout.group_width = 1; - sbi->layout.group_depth = -1; - sbi->layout.group_count = 1; - sbi->s_timeout = opts->timeout; - - sbi->one_comp.obj.partition = opts->pid; - sbi->one_comp.obj.id = 0; - exofs_make_credential(sbi->one_comp.cred, &sbi->one_comp.obj); - sbi->oc.single_comp = EC_SINGLE_COMP; - sbi->oc.comps = &sbi->one_comp; - - /* fill in some other data by hand */ - memset(sb->s_id, 0, sizeof(sb->s_id)); - strcpy(sb->s_id, "exofs"); - sb->s_blocksize = EXOFS_BLKSIZE; - sb->s_blocksize_bits = EXOFS_BLKSHIFT; - sb->s_maxbytes = MAX_LFS_FILESIZE; - sb->s_max_links = EXOFS_LINK_MAX; - atomic_set(&sbi->s_curr_pending, 0); - sb->s_bdev = NULL; - sb->s_dev = 0; - - comp.obj.partition = sbi->one_comp.obj.partition; - comp.obj.id = EXOFS_SUPER_ID; - exofs_make_credential(comp.cred, &comp.obj); - - ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb, sizeof(fscb)); - if (unlikely(ret)) - goto free_sbi; - - sb->s_magic = le16_to_cpu(fscb.s_magic); - /* NOTE: we read below to be backward compatible with old versions */ - sbi->s_nextid = le64_to_cpu(fscb.s_nextid); - sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles); - - /* make sure what we read from the object store is correct */ - if (sb->s_magic != EXOFS_SUPER_MAGIC) { - if (!silent) - EXOFS_ERR("ERROR: Bad magic value\n"); - ret = -EINVAL; - goto free_sbi; - } - if (le32_to_cpu(fscb.s_version) > EXOFS_FSCB_VER) { - EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n", - EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version)); - ret = -EINVAL; - goto free_sbi; - } - - /* start generation numbers from a random point */ - get_random_bytes(&sbi->s_next_generation, sizeof(u32)); - spin_lock_init(&sbi->s_next_gen_lock); - - table_count = le64_to_cpu(fscb.s_dev_table_count); - if (table_count) { - ret = exofs_read_lookup_dev_table(sbi, od, table_count); - if (unlikely(ret)) - goto free_sbi; - } else { - struct exofs_dev *eds; - - ret = __alloc_dev_table(sbi, 1, &eds); - if (unlikely(ret)) - goto free_sbi; - - ore_comp_set_dev(&sbi->oc, 0, od); - sbi->oc.numdevs = 1; - } - - __sbi_read_stats(sbi); - - /* set up operation vectors */ - ret = super_setup_bdi(sb); - if (ret) { - EXOFS_DBGMSG("Failed to super_setup_bdi\n"); - goto free_sbi; - } - sb->s_bdi->ra_pages = __ra_pages(&sbi->layout); - sb->s_fs_info = sbi; - sb->s_op = &exofs_sops; - sb->s_export_op = &exofs_export_ops; - root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF); - if (IS_ERR(root)) { - EXOFS_ERR("ERROR: exofs_iget failed\n"); - ret = PTR_ERR(root); - goto free_sbi; - } - sb->s_root = d_make_root(root); - if (!sb->s_root) { - EXOFS_ERR("ERROR: get root inode failed\n"); - ret = -ENOMEM; - goto free_sbi; - } - - if (!S_ISDIR(root->i_mode)) { - dput(sb->s_root); - sb->s_root = NULL; - EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n", - root->i_mode); - ret = -EINVAL; - goto free_sbi; - } - - exofs_sysfs_dbg_print(); - _exofs_print_device("Mounting", opts->dev_name, - ore_comp_dev(&sbi->oc, 0), - sbi->one_comp.obj.partition); - return 0; - -free_sbi: - EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n", - opts->dev_name, sbi->one_comp.obj.partition, ret); - exofs_free_sbi(sbi); - return ret; -} - -/* - * Set up the superblock (calls exofs_fill_super eventually) - */ -static struct dentry *exofs_mount(struct file_system_type *type, - int flags, const char *dev_name, - void *data) -{ - struct super_block *s; - struct exofs_mountopt opts; - struct exofs_sb_info *sbi; - int ret; - - ret = parse_options(data, &opts); - if (ret) { - kfree(opts.dev_name); - return ERR_PTR(ret); - } - - sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); - if (!sbi) { - kfree(opts.dev_name); - return ERR_PTR(-ENOMEM); - } - - s = sget(type, NULL, set_anon_super, flags, NULL); - - if (IS_ERR(s)) { - kfree(opts.dev_name); - kfree(sbi); - return ERR_CAST(s); - } - - if (!opts.dev_name) - opts.dev_name = dev_name; - - - ret = exofs_fill_super(s, &opts, sbi, flags & SB_SILENT ? 1 : 0); - if (ret) { - deactivate_locked_super(s); - return ERR_PTR(ret); - } - s->s_flags |= SB_ACTIVE; - return dget(s->s_root); -} - -/* - * Return information about the file system state in the buffer. This is used - * by the 'df' command, for example. - */ -static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf) -{ - struct super_block *sb = dentry->d_sb; - struct exofs_sb_info *sbi = sb->s_fs_info; - struct ore_io_state *ios; - struct osd_attr attrs[] = { - ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS, - OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)), - ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION, - OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)), - }; - uint64_t capacity = ULLONG_MAX; - uint64_t used = ULLONG_MAX; - int ret; - - ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios); - if (ret) { - EXOFS_DBGMSG("ore_get_io_state failed.\n"); - return ret; - } - - ios->in_attr = attrs; - ios->in_attr_len = ARRAY_SIZE(attrs); - - ret = ore_read(ios); - if (unlikely(ret)) - goto out; - - ret = extract_attr_from_ios(ios, &attrs[0]); - if (likely(!ret)) { - capacity = get_unaligned_be64(attrs[0].val_ptr); - if (unlikely(!capacity)) - capacity = ULLONG_MAX; - } else - EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n"); - - ret = extract_attr_from_ios(ios, &attrs[1]); - if (likely(!ret)) - used = get_unaligned_be64(attrs[1].val_ptr); - else - EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n"); - - /* fill in the stats buffer */ - buf->f_type = EXOFS_SUPER_MAGIC; - buf->f_bsize = EXOFS_BLKSIZE; - buf->f_blocks = capacity >> 9; - buf->f_bfree = (capacity - used) >> 9; - buf->f_bavail = buf->f_bfree; - buf->f_files = sbi->s_numfiles; - buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles; - buf->f_namelen = EXOFS_NAME_LEN; - -out: - ore_put_io_state(ios); - return ret; -} - -static const struct super_operations exofs_sops = { - .alloc_inode = exofs_alloc_inode, - .destroy_inode = exofs_destroy_inode, - .write_inode = exofs_write_inode, - .evict_inode = exofs_evict_inode, - .put_super = exofs_put_super, - .sync_fs = exofs_sync_fs, - .statfs = exofs_statfs, -}; - -/****************************************************************************** - * EXPORT OPERATIONS - *****************************************************************************/ - -static struct dentry *exofs_get_parent(struct dentry *child) -{ - unsigned long ino = exofs_parent_ino(child); - - if (!ino) - return ERR_PTR(-ESTALE); - - return d_obtain_alias(exofs_iget(child->d_sb, ino)); -} - -static struct inode *exofs_nfs_get_inode(struct super_block *sb, - u64 ino, u32 generation) -{ - struct inode *inode; - - inode = exofs_iget(sb, ino); - if (IS_ERR(inode)) - return ERR_CAST(inode); - if (generation && inode->i_generation != generation) { - /* we didn't find the right inode.. */ - iput(inode); - return ERR_PTR(-ESTALE); - } - return inode; -} - -static struct dentry *exofs_fh_to_dentry(struct super_block *sb, - struct fid *fid, int fh_len, int fh_type) -{ - return generic_fh_to_dentry(sb, fid, fh_len, fh_type, - exofs_nfs_get_inode); -} - -static struct dentry *exofs_fh_to_parent(struct super_block *sb, - struct fid *fid, int fh_len, int fh_type) -{ - return generic_fh_to_parent(sb, fid, fh_len, fh_type, - exofs_nfs_get_inode); -} - -static const struct export_operations exofs_export_ops = { - .fh_to_dentry = exofs_fh_to_dentry, - .fh_to_parent = exofs_fh_to_parent, - .get_parent = exofs_get_parent, -}; - -/****************************************************************************** - * INSMOD/RMMOD - *****************************************************************************/ - -/* - * struct that describes this file system - */ -static struct file_system_type exofs_type = { - .owner = THIS_MODULE, - .name = "exofs", - .mount = exofs_mount, - .kill_sb = generic_shutdown_super, -}; -MODULE_ALIAS_FS("exofs"); - -static int __init init_exofs(void) -{ - int err; - - err = init_inodecache(); - if (err) - goto out; - - err = register_filesystem(&exofs_type); - if (err) - goto out_d; - - /* We don't fail if sysfs creation failed */ - exofs_sysfs_init(); - - return 0; -out_d: - destroy_inodecache(); -out: - return err; -} - -static void __exit exit_exofs(void) -{ - exofs_sysfs_uninit(); - unregister_filesystem(&exofs_type); - destroy_inodecache(); -} - -MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>"); -MODULE_DESCRIPTION("exofs"); -MODULE_LICENSE("GPL"); - -module_init(init_exofs) -module_exit(exit_exofs) |