aboutsummaryrefslogtreecommitdiffstats
path: root/fs/exofs/super.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/exofs/super.c')
-rw-r--r--fs/exofs/super.c1071
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)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.