diff options
Diffstat (limited to 'kernel/fs/reiserfs/super.c')
| -rw-r--r-- | kernel/fs/reiserfs/super.c | 2563 |
1 files changed, 2563 insertions, 0 deletions
diff --git a/kernel/fs/reiserfs/super.c b/kernel/fs/reiserfs/super.c new file mode 100644 index 000000000..0111ad046 --- /dev/null +++ b/kernel/fs/reiserfs/super.c @@ -0,0 +1,2563 @@ +/* + * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README + * + * Trivial changes by Alan Cox to add the LFS fixes + * + * Trivial Changes: + * Rights granted to Hans Reiser to redistribute under other terms providing + * he accepts all liability including but not limited to patent, fitness + * for purpose, and direct or indirect claims arising from failure to perform. + * + * NO WARRANTY + */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/vmalloc.h> +#include <linux/time.h> +#include <linux/uaccess.h> +#include "reiserfs.h" +#include "acl.h" +#include "xattr.h" +#include <linux/init.h> +#include <linux/blkdev.h> +#include <linux/buffer_head.h> +#include <linux/exportfs.h> +#include <linux/quotaops.h> +#include <linux/vfs.h> +#include <linux/mount.h> +#include <linux/namei.h> +#include <linux/crc32.h> +#include <linux/seq_file.h> + +struct file_system_type reiserfs_fs_type; + +static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING; +static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING; +static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING; + +int is_reiserfs_3_5(struct reiserfs_super_block *rs) +{ + return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string, + strlen(reiserfs_3_5_magic_string)); +} + +int is_reiserfs_3_6(struct reiserfs_super_block *rs) +{ + return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string, + strlen(reiserfs_3_6_magic_string)); +} + +int is_reiserfs_jr(struct reiserfs_super_block *rs) +{ + return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string, + strlen(reiserfs_jr_magic_string)); +} + +static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs) +{ + return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) || + is_reiserfs_jr(rs)); +} + +static int reiserfs_remount(struct super_block *s, int *flags, char *data); +static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf); + +static int reiserfs_sync_fs(struct super_block *s, int wait) +{ + struct reiserfs_transaction_handle th; + + /* + * Writeback quota in non-journalled quota case - journalled quota has + * no dirty dquots + */ + dquot_writeback_dquots(s, -1); + reiserfs_write_lock(s); + if (!journal_begin(&th, s, 1)) + if (!journal_end_sync(&th)) + reiserfs_flush_old_commits(s); + reiserfs_write_unlock(s); + return 0; +} + +static void flush_old_commits(struct work_struct *work) +{ + struct reiserfs_sb_info *sbi; + struct super_block *s; + + sbi = container_of(work, struct reiserfs_sb_info, old_work.work); + s = sbi->s_journal->j_work_sb; + + spin_lock(&sbi->old_work_lock); + sbi->work_queued = 0; + spin_unlock(&sbi->old_work_lock); + + reiserfs_sync_fs(s, 1); +} + +void reiserfs_schedule_old_flush(struct super_block *s) +{ + struct reiserfs_sb_info *sbi = REISERFS_SB(s); + unsigned long delay; + + /* + * Avoid scheduling flush when sb is being shut down. It can race + * with journal shutdown and free still queued delayed work. + */ + if (s->s_flags & MS_RDONLY || !(s->s_flags & MS_ACTIVE)) + return; + + spin_lock(&sbi->old_work_lock); + if (!sbi->work_queued) { + delay = msecs_to_jiffies(dirty_writeback_interval * 10); + queue_delayed_work(system_long_wq, &sbi->old_work, delay); + sbi->work_queued = 1; + } + spin_unlock(&sbi->old_work_lock); +} + +static void cancel_old_flush(struct super_block *s) +{ + struct reiserfs_sb_info *sbi = REISERFS_SB(s); + + cancel_delayed_work_sync(&REISERFS_SB(s)->old_work); + spin_lock(&sbi->old_work_lock); + sbi->work_queued = 0; + spin_unlock(&sbi->old_work_lock); +} + +static int reiserfs_freeze(struct super_block *s) +{ + struct reiserfs_transaction_handle th; + + cancel_old_flush(s); + + reiserfs_write_lock(s); + if (!(s->s_flags & MS_RDONLY)) { + int err = journal_begin(&th, s, 1); + if (err) { + reiserfs_block_writes(&th); + } else { + reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), + 1); + journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s)); + reiserfs_block_writes(&th); + journal_end_sync(&th); + } + } + reiserfs_write_unlock(s); + return 0; +} + +static int reiserfs_unfreeze(struct super_block *s) +{ + reiserfs_allow_writes(s); + return 0; +} + +extern const struct in_core_key MAX_IN_CORE_KEY; + +/* + * this is used to delete "save link" when there are no items of a + * file it points to. It can either happen if unlink is completed but + * "save unlink" removal, or if file has both unlink and truncate + * pending and as unlink completes first (because key of "save link" + * protecting unlink is bigger that a key lf "save link" which + * protects truncate), so there left no items to make truncate + * completion on + */ +static int remove_save_link_only(struct super_block *s, + struct reiserfs_key *key, int oid_free) +{ + struct reiserfs_transaction_handle th; + int err; + + /* we are going to do one balancing */ + err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT); + if (err) + return err; + + reiserfs_delete_solid_item(&th, NULL, key); + if (oid_free) + /* removals are protected by direct items */ + reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid)); + + return journal_end(&th); +} + +#ifdef CONFIG_QUOTA +static int reiserfs_quota_on_mount(struct super_block *, int); +#endif + +/* look for uncompleted unlinks and truncates and complete them */ +static int finish_unfinished(struct super_block *s) +{ + INITIALIZE_PATH(path); + struct cpu_key max_cpu_key, obj_key; + struct reiserfs_key save_link_key, last_inode_key; + int retval = 0; + struct item_head *ih; + struct buffer_head *bh; + int item_pos; + char *item; + int done; + struct inode *inode; + int truncate; +#ifdef CONFIG_QUOTA + int i; + int ms_active_set; + int quota_enabled[REISERFS_MAXQUOTAS]; +#endif + + /* compose key to look for "save" links */ + max_cpu_key.version = KEY_FORMAT_3_5; + max_cpu_key.on_disk_key.k_dir_id = ~0U; + max_cpu_key.on_disk_key.k_objectid = ~0U; + set_cpu_key_k_offset(&max_cpu_key, ~0U); + max_cpu_key.key_length = 3; + + memset(&last_inode_key, 0, sizeof(last_inode_key)); + +#ifdef CONFIG_QUOTA + /* Needed for iput() to work correctly and not trash data */ + if (s->s_flags & MS_ACTIVE) { + ms_active_set = 0; + } else { + ms_active_set = 1; + s->s_flags |= MS_ACTIVE; + } + /* Turn on quotas so that they are updated correctly */ + for (i = 0; i < REISERFS_MAXQUOTAS; i++) { + quota_enabled[i] = 1; + if (REISERFS_SB(s)->s_qf_names[i]) { + int ret; + + if (sb_has_quota_active(s, i)) { + quota_enabled[i] = 0; + continue; + } + ret = reiserfs_quota_on_mount(s, i); + if (ret < 0) + reiserfs_warning(s, "reiserfs-2500", + "cannot turn on journaled " + "quota: error %d", ret); + } + } +#endif + + done = 0; + REISERFS_SB(s)->s_is_unlinked_ok = 1; + while (!retval) { + int depth; + retval = search_item(s, &max_cpu_key, &path); + if (retval != ITEM_NOT_FOUND) { + reiserfs_error(s, "vs-2140", + "search_by_key returned %d", retval); + break; + } + + bh = get_last_bh(&path); + item_pos = get_item_pos(&path); + if (item_pos != B_NR_ITEMS(bh)) { + reiserfs_warning(s, "vs-2060", + "wrong position found"); + break; + } + item_pos--; + ih = item_head(bh, item_pos); + + if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID) + /* there are no "save" links anymore */ + break; + + save_link_key = ih->ih_key; + if (is_indirect_le_ih(ih)) + truncate = 1; + else + truncate = 0; + + /* reiserfs_iget needs k_dirid and k_objectid only */ + item = ih_item_body(bh, ih); + obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item); + obj_key.on_disk_key.k_objectid = + le32_to_cpu(ih->ih_key.k_objectid); + obj_key.on_disk_key.k_offset = 0; + obj_key.on_disk_key.k_type = 0; + + pathrelse(&path); + + inode = reiserfs_iget(s, &obj_key); + if (!inode) { + /* + * the unlink almost completed, it just did not + * manage to remove "save" link and release objectid + */ + reiserfs_warning(s, "vs-2180", "iget failed for %K", + &obj_key); + retval = remove_save_link_only(s, &save_link_key, 1); + continue; + } + + if (!truncate && inode->i_nlink) { + /* file is not unlinked */ + reiserfs_warning(s, "vs-2185", + "file %K is not unlinked", + &obj_key); + retval = remove_save_link_only(s, &save_link_key, 0); + continue; + } + depth = reiserfs_write_unlock_nested(inode->i_sb); + dquot_initialize(inode); + reiserfs_write_lock_nested(inode->i_sb, depth); + + if (truncate && S_ISDIR(inode->i_mode)) { + /* + * We got a truncate request for a dir which + * is impossible. The only imaginable way is to + * execute unfinished truncate request then boot + * into old kernel, remove the file and create dir + * with the same key. + */ + reiserfs_warning(s, "green-2101", + "impossible truncate on a " + "directory %k. Please report", + INODE_PKEY(inode)); + retval = remove_save_link_only(s, &save_link_key, 0); + truncate = 0; + iput(inode); + continue; + } + + if (truncate) { + REISERFS_I(inode)->i_flags |= + i_link_saved_truncate_mask; + /* + * not completed truncate found. New size was + * committed together with "save" link + */ + reiserfs_info(s, "Truncating %k to %lld ..", + INODE_PKEY(inode), inode->i_size); + + /* don't update modification time */ + reiserfs_truncate_file(inode, 0); + + retval = remove_save_link(inode, truncate); + } else { + REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask; + /* not completed unlink (rmdir) found */ + reiserfs_info(s, "Removing %k..", INODE_PKEY(inode)); + if (memcmp(&last_inode_key, INODE_PKEY(inode), + sizeof(last_inode_key))){ + last_inode_key = *INODE_PKEY(inode); + /* removal gets completed in iput */ + retval = 0; + } else { + reiserfs_warning(s, "super-2189", "Dead loop " + "in finish_unfinished " + "detected, just remove " + "save link\n"); + retval = remove_save_link_only(s, + &save_link_key, 0); + } + } + + iput(inode); + printk("done\n"); + done++; + } + REISERFS_SB(s)->s_is_unlinked_ok = 0; + +#ifdef CONFIG_QUOTA + /* Turn quotas off */ + reiserfs_write_unlock(s); + for (i = 0; i < REISERFS_MAXQUOTAS; i++) { + if (sb_dqopt(s)->files[i] && quota_enabled[i]) + dquot_quota_off(s, i); + } + reiserfs_write_lock(s); + if (ms_active_set) + /* Restore the flag back */ + s->s_flags &= ~MS_ACTIVE; +#endif + pathrelse(&path); + if (done) + reiserfs_info(s, "There were %d uncompleted unlinks/truncates. " + "Completed\n", done); + return retval; +} + +/* + * to protect file being unlinked from getting lost we "safe" link files + * being unlinked. This link will be deleted in the same transaction with last + * item of file. mounting the filesystem we scan all these links and remove + * files which almost got lost + */ +void add_save_link(struct reiserfs_transaction_handle *th, + struct inode *inode, int truncate) +{ + INITIALIZE_PATH(path); + int retval; + struct cpu_key key; + struct item_head ih; + __le32 link; + + BUG_ON(!th->t_trans_id); + + /* file can only get one "save link" of each kind */ + RFALSE(truncate && + (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask), + "saved link already exists for truncated inode %lx", + (long)inode->i_ino); + RFALSE(!truncate && + (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask), + "saved link already exists for unlinked inode %lx", + (long)inode->i_ino); + + /* setup key of "save" link */ + key.version = KEY_FORMAT_3_5; + key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID; + key.on_disk_key.k_objectid = inode->i_ino; + if (!truncate) { + /* unlink, rmdir, rename */ + set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize); + set_cpu_key_k_type(&key, TYPE_DIRECT); + + /* item head of "safe" link */ + make_le_item_head(&ih, &key, key.version, + 1 + inode->i_sb->s_blocksize, TYPE_DIRECT, + 4 /*length */ , 0xffff /*free space */ ); + } else { + /* truncate */ + if (S_ISDIR(inode->i_mode)) + reiserfs_warning(inode->i_sb, "green-2102", + "Adding a truncate savelink for " + "a directory %k! Please report", + INODE_PKEY(inode)); + set_cpu_key_k_offset(&key, 1); + set_cpu_key_k_type(&key, TYPE_INDIRECT); + + /* item head of "safe" link */ + make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT, + 4 /*length */ , 0 /*free space */ ); + } + key.key_length = 3; + + /* look for its place in the tree */ + retval = search_item(inode->i_sb, &key, &path); + if (retval != ITEM_NOT_FOUND) { + if (retval != -ENOSPC) + reiserfs_error(inode->i_sb, "vs-2100", + "search_by_key (%K) returned %d", &key, + retval); + pathrelse(&path); + return; + } + + /* body of "save" link */ + link = INODE_PKEY(inode)->k_dir_id; + + /* put "save" link into tree, don't charge quota to anyone */ + retval = + reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link); + if (retval) { + if (retval != -ENOSPC) + reiserfs_error(inode->i_sb, "vs-2120", + "insert_item returned %d", retval); + } else { + if (truncate) + REISERFS_I(inode)->i_flags |= + i_link_saved_truncate_mask; + else + REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask; + } +} + +/* this opens transaction unlike add_save_link */ +int remove_save_link(struct inode *inode, int truncate) +{ + struct reiserfs_transaction_handle th; + struct reiserfs_key key; + int err; + + /* we are going to do one balancing only */ + err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT); + if (err) + return err; + + /* setup key of "save" link */ + key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID); + key.k_objectid = INODE_PKEY(inode)->k_objectid; + if (!truncate) { + /* unlink, rmdir, rename */ + set_le_key_k_offset(KEY_FORMAT_3_5, &key, + 1 + inode->i_sb->s_blocksize); + set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT); + } else { + /* truncate */ + set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1); + set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT); + } + + if ((truncate && + (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) || + (!truncate && + (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask))) + /* don't take quota bytes from anywhere */ + reiserfs_delete_solid_item(&th, NULL, &key); + if (!truncate) { + reiserfs_release_objectid(&th, inode->i_ino); + REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask; + } else + REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask; + + return journal_end(&th); +} + +static void reiserfs_kill_sb(struct super_block *s) +{ + if (REISERFS_SB(s)) { + reiserfs_proc_info_done(s); + /* + * Force any pending inode evictions to occur now. Any + * inodes to be removed that have extended attributes + * associated with them need to clean them up before + * we can release the extended attribute root dentries. + * shrink_dcache_for_umount will BUG if we don't release + * those before it's called so ->put_super is too late. + */ + shrink_dcache_sb(s); + + dput(REISERFS_SB(s)->xattr_root); + REISERFS_SB(s)->xattr_root = NULL; + dput(REISERFS_SB(s)->priv_root); + REISERFS_SB(s)->priv_root = NULL; + } + + kill_block_super(s); +} + +static void reiserfs_put_super(struct super_block *s) +{ + struct reiserfs_transaction_handle th; + th.t_trans_id = 0; + + dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); + + reiserfs_write_lock(s); + + /* + * change file system state to current state if it was mounted + * with read-write permissions + */ + if (!(s->s_flags & MS_RDONLY)) { + if (!journal_begin(&th, s, 10)) { + reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), + 1); + set_sb_umount_state(SB_DISK_SUPER_BLOCK(s), + REISERFS_SB(s)->s_mount_state); + journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s)); + } + } + + /* + * note, journal_release checks for readonly mount, and can + * decide not to do a journal_end + */ + journal_release(&th, s); + + reiserfs_free_bitmap_cache(s); + + brelse(SB_BUFFER_WITH_SB(s)); + + print_statistics(s); + + if (REISERFS_SB(s)->reserved_blocks != 0) { + reiserfs_warning(s, "green-2005", "reserved blocks left %d", + REISERFS_SB(s)->reserved_blocks); + } + + reiserfs_write_unlock(s); + mutex_destroy(&REISERFS_SB(s)->lock); + destroy_workqueue(REISERFS_SB(s)->commit_wq); + kfree(s->s_fs_info); + s->s_fs_info = NULL; +} + +static struct kmem_cache *reiserfs_inode_cachep; + +static struct inode *reiserfs_alloc_inode(struct super_block *sb) +{ + struct reiserfs_inode_info *ei; + ei = (struct reiserfs_inode_info *) + kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL); + if (!ei) + return NULL; + atomic_set(&ei->openers, 0); + mutex_init(&ei->tailpack); +#ifdef CONFIG_QUOTA + memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); +#endif + + return &ei->vfs_inode; +} + +static void reiserfs_i_callback(struct rcu_head *head) +{ + struct inode *inode = container_of(head, struct inode, i_rcu); + kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode)); +} + +static void reiserfs_destroy_inode(struct inode *inode) +{ + call_rcu(&inode->i_rcu, reiserfs_i_callback); +} + +static void init_once(void *foo) +{ + struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo; + + INIT_LIST_HEAD(&ei->i_prealloc_list); + inode_init_once(&ei->vfs_inode); +} + +static int __init init_inodecache(void) +{ + reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache", + sizeof(struct + reiserfs_inode_info), + 0, (SLAB_RECLAIM_ACCOUNT| + SLAB_MEM_SPREAD), + init_once); + if (reiserfs_inode_cachep == NULL) + return -ENOMEM; + return 0; +} + +static void destroy_inodecache(void) +{ + /* + * Make sure all delayed rcu free inodes are flushed before we + * destroy cache. + */ + rcu_barrier(); + kmem_cache_destroy(reiserfs_inode_cachep); +} + +/* we don't mark inodes dirty, we just log them */ +static void reiserfs_dirty_inode(struct inode *inode, int flags) +{ + struct reiserfs_transaction_handle th; + + int err = 0; + + if (inode->i_sb->s_flags & MS_RDONLY) { + reiserfs_warning(inode->i_sb, "clm-6006", + "writing inode %lu on readonly FS", + inode->i_ino); + return; + } + reiserfs_write_lock(inode->i_sb); + + /* + * this is really only used for atime updates, so they don't have + * to be included in O_SYNC or fsync + */ + err = journal_begin(&th, inode->i_sb, 1); + if (err) + goto out; + + reiserfs_update_sd(&th, inode); + journal_end(&th); + +out: + reiserfs_write_unlock(inode->i_sb); +} + +static int reiserfs_show_options(struct seq_file *seq, struct dentry *root) +{ + struct super_block *s = root->d_sb; + struct reiserfs_journal *journal = SB_JOURNAL(s); + long opts = REISERFS_SB(s)->s_mount_opt; + + if (opts & (1 << REISERFS_LARGETAIL)) + seq_puts(seq, ",tails=on"); + else if (!(opts & (1 << REISERFS_SMALLTAIL))) + seq_puts(seq, ",notail"); + /* tails=small is default so we don't show it */ + + if (!(opts & (1 << REISERFS_BARRIER_FLUSH))) + seq_puts(seq, ",barrier=none"); + /* barrier=flush is default so we don't show it */ + + if (opts & (1 << REISERFS_ERROR_CONTINUE)) + seq_puts(seq, ",errors=continue"); + else if (opts & (1 << REISERFS_ERROR_PANIC)) + seq_puts(seq, ",errors=panic"); + /* errors=ro is default so we don't show it */ + + if (opts & (1 << REISERFS_DATA_LOG)) + seq_puts(seq, ",data=journal"); + else if (opts & (1 << REISERFS_DATA_WRITEBACK)) + seq_puts(seq, ",data=writeback"); + /* data=ordered is default so we don't show it */ + + if (opts & (1 << REISERFS_ATTRS)) + seq_puts(seq, ",attrs"); + + if (opts & (1 << REISERFS_XATTRS_USER)) + seq_puts(seq, ",user_xattr"); + + if (opts & (1 << REISERFS_EXPOSE_PRIVROOT)) + seq_puts(seq, ",expose_privroot"); + + if (opts & (1 << REISERFS_POSIXACL)) + seq_puts(seq, ",acl"); + + if (REISERFS_SB(s)->s_jdev) + seq_printf(seq, ",jdev=%s", REISERFS_SB(s)->s_jdev); + + if (journal->j_max_commit_age != journal->j_default_max_commit_age) + seq_printf(seq, ",commit=%d", journal->j_max_commit_age); + +#ifdef CONFIG_QUOTA + if (REISERFS_SB(s)->s_qf_names[USRQUOTA]) + seq_printf(seq, ",usrjquota=%s", REISERFS_SB(s)->s_qf_names[USRQUOTA]); + else if (opts & (1 << REISERFS_USRQUOTA)) + seq_puts(seq, ",usrquota"); + if (REISERFS_SB(s)->s_qf_names[GRPQUOTA]) + seq_printf(seq, ",grpjquota=%s", REISERFS_SB(s)->s_qf_names[GRPQUOTA]); + else if (opts & (1 << REISERFS_GRPQUOTA)) + seq_puts(seq, ",grpquota"); + if (REISERFS_SB(s)->s_jquota_fmt) { + if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD) + seq_puts(seq, ",jqfmt=vfsold"); + else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0) + seq_puts(seq, ",jqfmt=vfsv0"); + } +#endif + + /* Block allocator options */ + if (opts & (1 << REISERFS_NO_BORDER)) + seq_puts(seq, ",block-allocator=noborder"); + if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION)) + seq_puts(seq, ",block-allocator=no_unhashed_relocation"); + if (opts & (1 << REISERFS_HASHED_RELOCATION)) + seq_puts(seq, ",block-allocator=hashed_relocation"); + if (opts & (1 << REISERFS_TEST4)) + seq_puts(seq, ",block-allocator=test4"); + show_alloc_options(seq, s); + return 0; +} + +#ifdef CONFIG_QUOTA +static ssize_t reiserfs_quota_write(struct super_block *, int, const char *, + size_t, loff_t); +static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t, + loff_t); + +static struct dquot **reiserfs_get_dquots(struct inode *inode) +{ + return REISERFS_I(inode)->i_dquot; +} +#endif + +static const struct super_operations reiserfs_sops = { + .alloc_inode = reiserfs_alloc_inode, + .destroy_inode = reiserfs_destroy_inode, + .write_inode = reiserfs_write_inode, + .dirty_inode = reiserfs_dirty_inode, + .evict_inode = reiserfs_evict_inode, + .put_super = reiserfs_put_super, + .sync_fs = reiserfs_sync_fs, + .freeze_fs = reiserfs_freeze, + .unfreeze_fs = reiserfs_unfreeze, + .statfs = reiserfs_statfs, + .remount_fs = reiserfs_remount, + .show_options = reiserfs_show_options, +#ifdef CONFIG_QUOTA + .quota_read = reiserfs_quota_read, + .quota_write = reiserfs_quota_write, + .get_dquots = reiserfs_get_dquots, +#endif +}; + +#ifdef CONFIG_QUOTA +#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") + +static int reiserfs_write_dquot(struct dquot *); +static int reiserfs_acquire_dquot(struct dquot *); +static int reiserfs_release_dquot(struct dquot *); +static int reiserfs_mark_dquot_dirty(struct dquot *); +static int reiserfs_write_info(struct super_block *, int); +static int reiserfs_quota_on(struct super_block *, int, int, struct path *); + +static const struct dquot_operations reiserfs_quota_operations = { + .write_dquot = reiserfs_write_dquot, + .acquire_dquot = reiserfs_acquire_dquot, + .release_dquot = reiserfs_release_dquot, + .mark_dirty = reiserfs_mark_dquot_dirty, + .write_info = reiserfs_write_info, + .alloc_dquot = dquot_alloc, + .destroy_dquot = dquot_destroy, +}; + +static const struct quotactl_ops reiserfs_qctl_operations = { + .quota_on = reiserfs_quota_on, + .quota_off = dquot_quota_off, + .quota_sync = dquot_quota_sync, + .get_state = dquot_get_state, + .set_info = dquot_set_dqinfo, + .get_dqblk = dquot_get_dqblk, + .set_dqblk = dquot_set_dqblk, +}; +#endif + +static const struct export_operations reiserfs_export_ops = { + .encode_fh = reiserfs_encode_fh, + .fh_to_dentry = reiserfs_fh_to_dentry, + .fh_to_parent = reiserfs_fh_to_parent, + .get_parent = reiserfs_get_parent, +}; + +/* + * this struct is used in reiserfs_getopt () for containing the value for + * those mount options that have values rather than being toggles. + */ +typedef struct { + char *value; + /* + * bitmask which is to set on mount_options bitmask + * when this value is found, 0 is no bits are to be changed. + */ + int setmask; + /* + * bitmask which is to clear on mount_options bitmask + * when this value is found, 0 is no bits are to be changed. + * This is applied BEFORE setmask + */ + int clrmask; +} arg_desc_t; + +/* Set this bit in arg_required to allow empty arguments */ +#define REISERFS_OPT_ALLOWEMPTY 31 + +/* + * this struct is used in reiserfs_getopt() for describing the + * set of reiserfs mount options + */ +typedef struct { + char *option_name; + + /* 0 if argument is not required, not 0 otherwise */ + int arg_required; + + /* list of values accepted by an option */ + const arg_desc_t *values; + + /* + * bitmask which is to set on mount_options bitmask + * when this value is found, 0 is no bits are to be changed. + */ + int setmask; + + /* + * bitmask which is to clear on mount_options bitmask + * when this value is found, 0 is no bits are to be changed. + * This is applied BEFORE setmask + */ + int clrmask; +} opt_desc_t; + +/* possible values for -o data= */ +static const arg_desc_t logging_mode[] = { + {"ordered", 1 << REISERFS_DATA_ORDERED, + (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)}, + {"journal", 1 << REISERFS_DATA_LOG, + (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)}, + {"writeback", 1 << REISERFS_DATA_WRITEBACK, + (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)}, + {.value = NULL} +}; + +/* possible values for -o barrier= */ +static const arg_desc_t barrier_mode[] = { + {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH}, + {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE}, + {.value = NULL} +}; + +/* + * possible values for "-o block-allocator=" and bits which are to be set in + * s_mount_opt of reiserfs specific part of in-core super block + */ +static const arg_desc_t balloc[] = { + {"noborder", 1 << REISERFS_NO_BORDER, 0}, + {"border", 0, 1 << REISERFS_NO_BORDER}, + {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0}, + {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0}, + {"test4", 1 << REISERFS_TEST4, 0}, + {"notest4", 0, 1 << REISERFS_TEST4}, + {NULL, 0, 0} +}; + +static const arg_desc_t tails[] = { + {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL}, + {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)}, + {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL}, + {NULL, 0, 0} +}; + +static const arg_desc_t error_actions[] = { + {"panic", 1 << REISERFS_ERROR_PANIC, + (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)}, + {"ro-remount", 1 << REISERFS_ERROR_RO, + (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)}, +#ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG + {"continue", 1 << REISERFS_ERROR_CONTINUE, + (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)}, +#endif + {NULL, 0, 0}, +}; + +/* + * proceed only one option from a list *cur - string containing of mount + * options + * opts - array of options which are accepted + * opt_arg - if option is found and requires an argument and if it is specifed + * in the input - pointer to the argument is stored here + * bit_flags - if option requires to set a certain bit - it is set here + * return -1 if unknown option is found, opt->arg_required otherwise + */ +static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts, + char **opt_arg, unsigned long *bit_flags) +{ + char *p; + /* + * foo=bar, + * ^ ^ ^ + * | | +-- option_end + * | +-- arg_start + * +-- option_start + */ + const opt_desc_t *opt; + const arg_desc_t *arg; + + p = *cur; + + /* assume argument cannot contain commas */ + *cur = strchr(p, ','); + if (*cur) { + *(*cur) = '\0'; + (*cur)++; + } + + if (!strncmp(p, "alloc=", 6)) { + /* + * Ugly special case, probably we should redo options + * parser so that it can understand several arguments for + * some options, also so that it can fill several bitfields + * with option values. + */ + if (reiserfs_parse_alloc_options(s, p + 6)) { + return -1; + } else { + return 0; + } + } + + /* for every option in the list */ + for (opt = opts; opt->option_name; opt++) { + if (!strncmp(p, opt->option_name, strlen(opt->option_name))) { + if (bit_flags) { + if (opt->clrmask == + (1 << REISERFS_UNSUPPORTED_OPT)) + reiserfs_warning(s, "super-6500", + "%s not supported.\n", + p); + else + *bit_flags &= ~opt->clrmask; + if (opt->setmask == + (1 << REISERFS_UNSUPPORTED_OPT)) + reiserfs_warning(s, "super-6501", + "%s not supported.\n", + p); + else + *bit_flags |= opt->setmask; + } + break; + } + } + if (!opt->option_name) { + reiserfs_warning(s, "super-6502", + "unknown mount option \"%s\"", p); + return -1; + } + + p += strlen(opt->option_name); + switch (*p) { + case '=': + if (!opt->arg_required) { + reiserfs_warning(s, "super-6503", + "the option \"%s\" does not " + "require an argument\n", + opt->option_name); + return -1; + } + break; + + case 0: + if (opt->arg_required) { + reiserfs_warning(s, "super-6504", + "the option \"%s\" requires an " + "argument\n", opt->option_name); + return -1; + } + break; + default: + reiserfs_warning(s, "super-6505", + "head of option \"%s\" is only correct\n", + opt->option_name); + return -1; + } + + /* + * move to the argument, or to next option if argument is not + * required + */ + p++; + + if (opt->arg_required + && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY)) + && !strlen(p)) { + /* this catches "option=," if not allowed */ + reiserfs_warning(s, "super-6506", + "empty argument for \"%s\"\n", + opt->option_name); + return -1; + } + + if (!opt->values) { + /* *=NULLopt_arg contains pointer to argument */ + *opt_arg = p; + return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY); + } + + /* values possible for this option are listed in opt->values */ + for (arg = opt->values; arg->value; arg++) { + if (!strcmp(p, arg->value)) { + if (bit_flags) { + *bit_flags &= ~arg->clrmask; + *bit_flags |= arg->setmask; + } + return opt->arg_required; + } + } + + reiserfs_warning(s, "super-6506", + "bad value \"%s\" for option \"%s\"\n", p, + opt->option_name); + return -1; +} + +/* returns 0 if something is wrong in option string, 1 - otherwise */ +static int reiserfs_parse_options(struct super_block *s, + + /* string given via mount's -o */ + char *options, + + /* + * after the parsing phase, contains the + * collection of bitflags defining what + * mount options were selected. + */ + unsigned long *mount_options, + + /* strtol-ed from NNN of resize=NNN */ + unsigned long *blocks, + char **jdev_name, + unsigned int *commit_max_age, + char **qf_names, + unsigned int *qfmt) +{ + int c; + char *arg = NULL; + char *pos; + opt_desc_t opts[] = { + /* + * Compatibility stuff, so that -o notail for old + * setups still work + */ + {"tails",.arg_required = 't',.values = tails}, + {"notail",.clrmask = + (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)}, + {"conv",.setmask = 1 << REISERFS_CONVERT}, + {"attrs",.setmask = 1 << REISERFS_ATTRS}, + {"noattrs",.clrmask = 1 << REISERFS_ATTRS}, + {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT}, +#ifdef CONFIG_REISERFS_FS_XATTR + {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER}, + {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER}, +#else + {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT}, + {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT}, +#endif +#ifdef CONFIG_REISERFS_FS_POSIX_ACL + {"acl",.setmask = 1 << REISERFS_POSIXACL}, + {"noacl",.clrmask = 1 << REISERFS_POSIXACL}, +#else + {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT}, + {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT}, +#endif + {.option_name = "nolog"}, + {"replayonly",.setmask = 1 << REPLAYONLY}, + {"block-allocator",.arg_required = 'a',.values = balloc}, + {"data",.arg_required = 'd',.values = logging_mode}, + {"barrier",.arg_required = 'b',.values = barrier_mode}, + {"resize",.arg_required = 'r',.values = NULL}, + {"jdev",.arg_required = 'j',.values = NULL}, + {"nolargeio",.arg_required = 'w',.values = NULL}, + {"commit",.arg_required = 'c',.values = NULL}, + {"usrquota",.setmask = 1 << REISERFS_USRQUOTA}, + {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA}, + {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA}, + {"errors",.arg_required = 'e',.values = error_actions}, + {"usrjquota",.arg_required = + 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL}, + {"grpjquota",.arg_required = + 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL}, + {"jqfmt",.arg_required = 'f',.values = NULL}, + {.option_name = NULL} + }; + + *blocks = 0; + if (!options || !*options) + /* + * use default configuration: create tails, journaling on, no + * conversion to newest format + */ + return 1; + + for (pos = options; pos;) { + c = reiserfs_getopt(s, &pos, opts, &arg, mount_options); + if (c == -1) + /* wrong option is given */ + return 0; + + if (c == 'r') { + char *p; + + p = NULL; + /* "resize=NNN" or "resize=auto" */ + + if (!strcmp(arg, "auto")) { + /* From JFS code, to auto-get the size. */ + *blocks = + s->s_bdev->bd_inode->i_size >> s-> + s_blocksize_bits; + } else { + *blocks = simple_strtoul(arg, &p, 0); + if (*p != '\0') { + /* NNN does not look like a number */ + reiserfs_warning(s, "super-6507", + "bad value %s for " + "-oresize\n", arg); + return 0; + } + } + } + + if (c == 'c') { + char *p = NULL; + unsigned long val = simple_strtoul(arg, &p, 0); + /* commit=NNN (time in seconds) */ + if (*p != '\0' || val >= (unsigned int)-1) { + reiserfs_warning(s, "super-6508", + "bad value %s for -ocommit\n", + arg); + return 0; + } + *commit_max_age = (unsigned int)val; + } + + if (c == 'w') { + reiserfs_warning(s, "super-6509", "nolargeio option " + "is no longer supported"); + return 0; + } + + if (c == 'j') { + if (arg && *arg && jdev_name) { + /* Hm, already assigned? */ + if (*jdev_name) { + reiserfs_warning(s, "super-6510", + "journal device was " + "already specified to " + "be %s", *jdev_name); + return 0; + } + *jdev_name = arg; + } + } +#ifdef CONFIG_QUOTA + if (c == 'u' || c == 'g') { + int qtype = c == 'u' ? USRQUOTA : GRPQUOTA; + + if (sb_any_quota_loaded(s) && + (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) { + reiserfs_warning(s, "super-6511", + "cannot change journaled " + "quota options when quota " + "turned on."); + return 0; + } + if (*arg) { /* Some filename specified? */ + if (REISERFS_SB(s)->s_qf_names[qtype] + && strcmp(REISERFS_SB(s)->s_qf_names[qtype], + arg)) { + reiserfs_warning(s, "super-6512", + "%s quota file " + "already specified.", + QTYPE2NAME(qtype)); + return 0; + } + if (strchr(arg, '/')) { + reiserfs_warning(s, "super-6513", + "quotafile must be " + "on filesystem root."); + return 0; + } + qf_names[qtype] = kstrdup(arg, GFP_KERNEL); + if (!qf_names[qtype]) { + reiserfs_warning(s, "reiserfs-2502", + "not enough memory " + "for storing " + "quotafile name."); + return 0; + } + if (qtype == USRQUOTA) + *mount_options |= 1 << REISERFS_USRQUOTA; + else + *mount_options |= 1 << REISERFS_GRPQUOTA; + } else { + if (qf_names[qtype] != + REISERFS_SB(s)->s_qf_names[qtype]) + kfree(qf_names[qtype]); + qf_names[qtype] = NULL; + if (qtype == USRQUOTA) + *mount_options &= ~(1 << REISERFS_USRQUOTA); + else + *mount_options &= ~(1 << REISERFS_GRPQUOTA); + } + } + if (c == 'f') { + if (!strcmp(arg, "vfsold")) + *qfmt = QFMT_VFS_OLD; + else if (!strcmp(arg, "vfsv0")) + *qfmt = QFMT_VFS_V0; + else { + reiserfs_warning(s, "super-6514", + "unknown quota format " + "specified."); + return 0; + } + if (sb_any_quota_loaded(s) && + *qfmt != REISERFS_SB(s)->s_jquota_fmt) { + reiserfs_warning(s, "super-6515", + "cannot change journaled " + "quota options when quota " + "turned on."); + return 0; + } + } +#else + if (c == 'u' || c == 'g' || c == 'f') { + reiserfs_warning(s, "reiserfs-2503", "journaled " + "quota options not supported."); + return 0; + } +#endif + } + +#ifdef CONFIG_QUOTA + if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt + && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) { + reiserfs_warning(s, "super-6515", + "journaled quota format not specified."); + return 0; + } + if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) && + sb_has_quota_loaded(s, USRQUOTA)) || + (!(*mount_options & (1 << REISERFS_GRPQUOTA)) && + sb_has_quota_loaded(s, GRPQUOTA))) { + reiserfs_warning(s, "super-6516", "quota options must " + "be present when quota is turned on."); + return 0; + } +#endif + + return 1; +} + +static void switch_data_mode(struct super_block *s, unsigned long mode) +{ + REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) | + (1 << REISERFS_DATA_ORDERED) | + (1 << REISERFS_DATA_WRITEBACK)); + REISERFS_SB(s)->s_mount_opt |= (1 << mode); +} + +static void handle_data_mode(struct super_block *s, unsigned long mount_options) +{ + if (mount_options & (1 << REISERFS_DATA_LOG)) { + if (!reiserfs_data_log(s)) { + switch_data_mode(s, REISERFS_DATA_LOG); + reiserfs_info(s, "switching to journaled data mode\n"); + } + } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) { + if (!reiserfs_data_ordered(s)) { + switch_data_mode(s, REISERFS_DATA_ORDERED); + reiserfs_info(s, "switching to ordered data mode\n"); + } + } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) { + if (!reiserfs_data_writeback(s)) { + switch_data_mode(s, REISERFS_DATA_WRITEBACK); + reiserfs_info(s, "switching to writeback data mode\n"); + } + } +} + +static void handle_barrier_mode(struct super_block *s, unsigned long bits) +{ + int flush = (1 << REISERFS_BARRIER_FLUSH); + int none = (1 << REISERFS_BARRIER_NONE); + int all_barrier = flush | none; + + if (bits & all_barrier) { + REISERFS_SB(s)->s_mount_opt &= ~all_barrier; + if (bits & flush) { + REISERFS_SB(s)->s_mount_opt |= flush; + printk("reiserfs: enabling write barrier flush mode\n"); + } else if (bits & none) { + REISERFS_SB(s)->s_mount_opt |= none; + printk("reiserfs: write barriers turned off\n"); + } + } +} + +static void handle_attrs(struct super_block *s) +{ + struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s); + + if (reiserfs_attrs(s)) { + if (old_format_only(s)) { + reiserfs_warning(s, "super-6517", "cannot support " + "attributes on 3.5.x disk format"); + REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS); + return; + } + if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) { + reiserfs_warning(s, "super-6518", "cannot support " + "attributes until flag is set in " + "super-block"); + REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS); + } + } +} + +#ifdef CONFIG_QUOTA +static void handle_quota_files(struct super_block *s, char **qf_names, + unsigned int *qfmt) +{ + int i; + + for (i = 0; i < REISERFS_MAXQUOTAS; i++) { + if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i]) + kfree(REISERFS_SB(s)->s_qf_names[i]); + REISERFS_SB(s)->s_qf_names[i] = qf_names[i]; + } + if (*qfmt) + REISERFS_SB(s)->s_jquota_fmt = *qfmt; +} +#endif + +static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg) +{ + struct reiserfs_super_block *rs; + struct reiserfs_transaction_handle th; + unsigned long blocks; + unsigned long mount_options = REISERFS_SB(s)->s_mount_opt; + unsigned long safe_mask = 0; + unsigned int commit_max_age = (unsigned int)-1; + struct reiserfs_journal *journal = SB_JOURNAL(s); + char *new_opts = kstrdup(arg, GFP_KERNEL); + int err; + char *qf_names[REISERFS_MAXQUOTAS]; + unsigned int qfmt = 0; +#ifdef CONFIG_QUOTA + int i; +#endif + + sync_filesystem(s); + reiserfs_write_lock(s); + +#ifdef CONFIG_QUOTA + memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names)); +#endif + + rs = SB_DISK_SUPER_BLOCK(s); + + if (!reiserfs_parse_options + (s, arg, &mount_options, &blocks, NULL, &commit_max_age, + qf_names, &qfmt)) { +#ifdef CONFIG_QUOTA + for (i = 0; i < REISERFS_MAXQUOTAS; i++) + if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i]) + kfree(qf_names[i]); +#endif + err = -EINVAL; + goto out_err_unlock; + } +#ifdef CONFIG_QUOTA + handle_quota_files(s, qf_names, &qfmt); +#endif + + handle_attrs(s); + + /* Add options that are safe here */ + safe_mask |= 1 << REISERFS_SMALLTAIL; + safe_mask |= 1 << REISERFS_LARGETAIL; + safe_mask |= 1 << REISERFS_NO_BORDER; + safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION; + safe_mask |= 1 << REISERFS_HASHED_RELOCATION; + safe_mask |= 1 << REISERFS_TEST4; + safe_mask |= 1 << REISERFS_ATTRS; + safe_mask |= 1 << REISERFS_XATTRS_USER; + safe_mask |= 1 << REISERFS_POSIXACL; + safe_mask |= 1 << REISERFS_BARRIER_FLUSH; + safe_mask |= 1 << REISERFS_BARRIER_NONE; + safe_mask |= 1 << REISERFS_ERROR_RO; + safe_mask |= 1 << REISERFS_ERROR_CONTINUE; + safe_mask |= 1 << REISERFS_ERROR_PANIC; + safe_mask |= 1 << REISERFS_USRQUOTA; + safe_mask |= 1 << REISERFS_GRPQUOTA; + + /* + * Update the bitmask, taking care to keep + * the bits we're not allowed to change here + */ + REISERFS_SB(s)->s_mount_opt = + (REISERFS_SB(s)-> + s_mount_opt & ~safe_mask) | (mount_options & safe_mask); + + if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) { + journal->j_max_commit_age = commit_max_age; + journal->j_max_trans_age = commit_max_age; + } else if (commit_max_age == 0) { + /* 0 means restore defaults. */ + journal->j_max_commit_age = journal->j_default_max_commit_age; + journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE; + } + + if (blocks) { + err = reiserfs_resize(s, blocks); + if (err != 0) + goto out_err_unlock; + } + + if (*mount_flags & MS_RDONLY) { + reiserfs_write_unlock(s); + reiserfs_xattr_init(s, *mount_flags); + /* remount read-only */ + if (s->s_flags & MS_RDONLY) + /* it is read-only already */ + goto out_ok_unlocked; + + err = dquot_suspend(s, -1); + if (err < 0) + goto out_err; + + /* try to remount file system with read-only permissions */ + if (sb_umount_state(rs) == REISERFS_VALID_FS + || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) { + goto out_ok_unlocked; + } + + reiserfs_write_lock(s); + + err = journal_begin(&th, s, 10); + if (err) + goto out_err_unlock; + + /* Mounting a rw partition read-only. */ + reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1); + set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state); + journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s)); + } else { + /* remount read-write */ + if (!(s->s_flags & MS_RDONLY)) { + reiserfs_write_unlock(s); + reiserfs_xattr_init(s, *mount_flags); + goto out_ok_unlocked; /* We are read-write already */ + } + + if (reiserfs_is_journal_aborted(journal)) { + err = journal->j_errno; + goto out_err_unlock; + } + + handle_data_mode(s, mount_options); + handle_barrier_mode(s, mount_options); + REISERFS_SB(s)->s_mount_state = sb_umount_state(rs); + + /* now it is safe to call journal_begin */ + s->s_flags &= ~MS_RDONLY; + err = journal_begin(&th, s, 10); + if (err) + goto out_err_unlock; + + /* Mount a partition which is read-only, read-write */ + reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1); + REISERFS_SB(s)->s_mount_state = sb_umount_state(rs); + s->s_flags &= ~MS_RDONLY; + set_sb_umount_state(rs, REISERFS_ERROR_FS); + if (!old_format_only(s)) + set_sb_mnt_count(rs, sb_mnt_count(rs) + 1); + /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */ + journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s)); + REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS; + } + /* this will force a full flush of all journal lists */ + SB_JOURNAL(s)->j_must_wait = 1; + err = journal_end(&th); + if (err) + goto out_err_unlock; + + reiserfs_write_unlock(s); + if (!(*mount_flags & MS_RDONLY)) { + dquot_resume(s, -1); + reiserfs_write_lock(s); + finish_unfinished(s); + reiserfs_write_unlock(s); + reiserfs_xattr_init(s, *mount_flags); + } + +out_ok_unlocked: + replace_mount_options(s, new_opts); + return 0; + +out_err_unlock: + reiserfs_write_unlock(s); +out_err: + kfree(new_opts); + return err; +} + +static int read_super_block(struct super_block *s, int offset) +{ + struct buffer_head *bh; + struct reiserfs_super_block *rs; + int fs_blocksize; + + bh = sb_bread(s, offset / s->s_blocksize); + if (!bh) { + reiserfs_warning(s, "sh-2006", + "bread failed (dev %s, block %lu, size %lu)", + s->s_id, offset / s->s_blocksize, + s->s_blocksize); + return 1; + } + + rs = (struct reiserfs_super_block *)bh->b_data; + if (!is_any_reiserfs_magic_string(rs)) { + brelse(bh); + return 1; + } + /* + * ok, reiserfs signature (old or new) found in at the given offset + */ + fs_blocksize = sb_blocksize(rs); + brelse(bh); + sb_set_blocksize(s, fs_blocksize); + + bh = sb_bread(s, offset / s->s_blocksize); + if (!bh) { + reiserfs_warning(s, "sh-2007", + "bread failed (dev %s, block %lu, size %lu)", + s->s_id, offset / s->s_blocksize, + s->s_blocksize); + return 1; + } + + rs = (struct reiserfs_super_block *)bh->b_data; + if (sb_blocksize(rs) != s->s_blocksize) { + reiserfs_warning(s, "sh-2011", "can't find a reiserfs " + "filesystem on (dev %s, block %llu, size %lu)", + s->s_id, + (unsigned long long)bh->b_blocknr, + s->s_blocksize); + brelse(bh); + return 1; + } + + if (rs->s_v1.s_root_block == cpu_to_le32(-1)) { + brelse(bh); + reiserfs_warning(s, "super-6519", "Unfinished reiserfsck " + "--rebuild-tree run detected. Please run\n" + "reiserfsck --rebuild-tree and wait for a " + "completion. If that fails\n" + "get newer reiserfsprogs package"); + return 1; + } + + SB_BUFFER_WITH_SB(s) = bh; + SB_DISK_SUPER_BLOCK(s) = rs; + + /* + * magic is of non-standard journal filesystem, look at s_version to + * find which format is in use + */ + if (is_reiserfs_jr(rs)) { + if (sb_version(rs) == REISERFS_VERSION_2) + reiserfs_info(s, "found reiserfs format \"3.6\"" + " with non-standard journal\n"); + else if (sb_version(rs) == REISERFS_VERSION_1) + reiserfs_info(s, "found reiserfs format \"3.5\"" + " with non-standard journal\n"); + else { + reiserfs_warning(s, "sh-2012", "found unknown " + "format \"%u\" of reiserfs with " + "non-standard magic", sb_version(rs)); + return 1; + } + } else + /* + * s_version of standard format may contain incorrect + * information, so we just look at the magic string + */ + reiserfs_info(s, + "found reiserfs format \"%s\" with standard journal\n", + is_reiserfs_3_5(rs) ? "3.5" : "3.6"); + + s->s_op = &reiserfs_sops; + s->s_export_op = &reiserfs_export_ops; +#ifdef CONFIG_QUOTA + s->s_qcop = &reiserfs_qctl_operations; + s->dq_op = &reiserfs_quota_operations; + s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; +#endif + + /* + * new format is limited by the 32 bit wide i_blocks field, want to + * be one full block below that. + */ + s->s_maxbytes = (512LL << 32) - s->s_blocksize; + return 0; +} + +/* after journal replay, reread all bitmap and super blocks */ +static int reread_meta_blocks(struct super_block *s) +{ + ll_rw_block(READ, 1, &SB_BUFFER_WITH_SB(s)); + wait_on_buffer(SB_BUFFER_WITH_SB(s)); + if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) { + reiserfs_warning(s, "reiserfs-2504", "error reading the super"); + return 1; + } + + return 0; +} + +/* hash detection stuff */ + +/* + * if root directory is empty - we set default - Yura's - hash and + * warn about it + * FIXME: we look for only one name in a directory. If tea and yura + * both have the same value - we ask user to send report to the + * mailing list + */ +static __u32 find_hash_out(struct super_block *s) +{ + int retval; + struct inode *inode; + struct cpu_key key; + INITIALIZE_PATH(path); + struct reiserfs_dir_entry de; + struct reiserfs_de_head *deh; + __u32 hash = DEFAULT_HASH; + __u32 deh_hashval, teahash, r5hash, yurahash; + + inode = d_inode(s->s_root); + + make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3); + retval = search_by_entry_key(s, &key, &path, &de); + if (retval == IO_ERROR) { + pathrelse(&path); + return UNSET_HASH; + } + if (retval == NAME_NOT_FOUND) + de.de_entry_num--; + + set_de_name_and_namelen(&de); + deh = de.de_deh + de.de_entry_num; + + if (deh_offset(deh) == DOT_DOT_OFFSET) { + /* allow override in this case */ + if (reiserfs_rupasov_hash(s)) + hash = YURA_HASH; + reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n"); + goto out; + } + + deh_hashval = GET_HASH_VALUE(deh_offset(deh)); + r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen)); + teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen)); + yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen)); + + if ((teahash == r5hash && deh_hashval == r5hash) || + (teahash == yurahash && deh_hashval == yurahash) || + (r5hash == yurahash && deh_hashval == yurahash)) { + reiserfs_warning(s, "reiserfs-2506", + "Unable to automatically detect hash " + "function. Please mount with -o " + "hash={tea,rupasov,r5}"); + hash = UNSET_HASH; + goto out; + } + + if (deh_hashval == yurahash) + hash = YURA_HASH; + else if (deh_hashval == teahash) + hash = TEA_HASH; + else if (deh_hashval == r5hash) + hash = R5_HASH; + else { + reiserfs_warning(s, "reiserfs-2506", + "Unrecognised hash function"); + hash = UNSET_HASH; + } +out: + pathrelse(&path); + return hash; +} + +/* finds out which hash names are sorted with */ +static int what_hash(struct super_block *s) +{ + __u32 code; + + code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s)); + + /* + * reiserfs_hash_detect() == true if any of the hash mount options + * were used. We must check them to make sure the user isn't + * using a bad hash value + */ + if (code == UNSET_HASH || reiserfs_hash_detect(s)) + code = find_hash_out(s); + + if (code != UNSET_HASH && reiserfs_hash_detect(s)) { + /* + * detection has found the hash, and we must check against the + * mount options + */ + if (reiserfs_rupasov_hash(s) && code != YURA_HASH) { + reiserfs_warning(s, "reiserfs-2507", + "Error, %s hash detected, " + "unable to force rupasov hash", + reiserfs_hashname(code)); + code = UNSET_HASH; + } else if (reiserfs_tea_hash(s) && code != TEA_HASH) { + reiserfs_warning(s, "reiserfs-2508", + "Error, %s hash detected, " + "unable to force tea hash", + reiserfs_hashname(code)); + code = UNSET_HASH; + } else if (reiserfs_r5_hash(s) && code != R5_HASH) { + reiserfs_warning(s, "reiserfs-2509", + "Error, %s hash detected, " + "unable to force r5 hash", + reiserfs_hashname(code)); + code = UNSET_HASH; + } + } else { + /* + * find_hash_out was not called or + * could not determine the hash + */ + if (reiserfs_rupasov_hash(s)) { + code = YURA_HASH; + } else if (reiserfs_tea_hash(s)) { + code = TEA_HASH; + } else if (reiserfs_r5_hash(s)) { + code = R5_HASH; + } + } + + /* + * if we are mounted RW, and we have a new valid hash code, update + * the super + */ + if (code != UNSET_HASH && + !(s->s_flags & MS_RDONLY) && + code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) { + set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code); + } + return code; +} + +/* return pointer to appropriate function */ +static hashf_t hash_function(struct super_block *s) +{ + switch (what_hash(s)) { + case TEA_HASH: + reiserfs_info(s, "Using tea hash to sort names\n"); + return keyed_hash; + case YURA_HASH: + reiserfs_info(s, "Using rupasov hash to sort names\n"); + return yura_hash; + case R5_HASH: + reiserfs_info(s, "Using r5 hash to sort names\n"); + return r5_hash; + } + return NULL; +} + +/* this is used to set up correct value for old partitions */ +static int function2code(hashf_t func) +{ + if (func == keyed_hash) + return TEA_HASH; + if (func == yura_hash) + return YURA_HASH; + if (func == r5_hash) + return R5_HASH; + + BUG(); /* should never happen */ + + return 0; +} + +#define SWARN(silent, s, id, ...) \ + if (!(silent)) \ + reiserfs_warning(s, id, __VA_ARGS__) + +static int reiserfs_fill_super(struct super_block *s, void *data, int silent) +{ + struct inode *root_inode; + struct reiserfs_transaction_handle th; + int old_format = 0; + unsigned long blocks; + unsigned int commit_max_age = 0; + int jinit_done = 0; + struct reiserfs_iget_args args; + struct reiserfs_super_block *rs; + char *jdev_name; + struct reiserfs_sb_info *sbi; + int errval = -EINVAL; + char *qf_names[REISERFS_MAXQUOTAS] = {}; + unsigned int qfmt = 0; + + save_mount_options(s, data); + + sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL); + if (!sbi) + return -ENOMEM; + s->s_fs_info = sbi; + /* Set default values for options: non-aggressive tails, RO on errors */ + sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL); + sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO); + sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH); + /* no preallocation minimum, be smart in reiserfs_file_write instead */ + sbi->s_alloc_options.preallocmin = 0; + /* Preallocate by 16 blocks (17-1) at once */ + sbi->s_alloc_options.preallocsize = 17; + /* setup default block allocator options */ + reiserfs_init_alloc_options(s); + + spin_lock_init(&sbi->old_work_lock); + INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits); + mutex_init(&sbi->lock); + sbi->lock_depth = -1; + + sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0, + s->s_id); + if (!sbi->commit_wq) { + SWARN(silent, s, "", "Cannot allocate commit workqueue"); + errval = -ENOMEM; + goto error_unlocked; + } + + jdev_name = NULL; + if (reiserfs_parse_options + (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name, + &commit_max_age, qf_names, &qfmt) == 0) { + goto error_unlocked; + } + if (jdev_name && jdev_name[0]) { + sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL); + if (!sbi->s_jdev) { + SWARN(silent, s, "", "Cannot allocate memory for " + "journal device name"); + goto error; + } + } +#ifdef CONFIG_QUOTA + handle_quota_files(s, qf_names, &qfmt); +#endif + + if (blocks) { + SWARN(silent, s, "jmacd-7", "resize option for remount only"); + goto error_unlocked; + } + + /* + * try old format (undistributed bitmap, super block in 8-th 1k + * block of a device) + */ + if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES)) + old_format = 1; + + /* + * try new format (64-th 1k block), which can contain reiserfs + * super block + */ + else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) { + SWARN(silent, s, "sh-2021", "can not find reiserfs on %s", + s->s_id); + goto error_unlocked; + } + + rs = SB_DISK_SUPER_BLOCK(s); + /* + * Let's do basic sanity check to verify that underlying device is not + * smaller than the filesystem. If the check fails then abort and + * scream, because bad stuff will happen otherwise. + */ + if (s->s_bdev && s->s_bdev->bd_inode + && i_size_read(s->s_bdev->bd_inode) < + sb_block_count(rs) * sb_blocksize(rs)) { + SWARN(silent, s, "", "Filesystem cannot be " + "mounted because it is bigger than the device"); + SWARN(silent, s, "", "You may need to run fsck " + "or increase size of your LVM partition"); + SWARN(silent, s, "", "Or may be you forgot to " + "reboot after fdisk when it told you to"); + goto error_unlocked; + } + + sbi->s_mount_state = SB_REISERFS_STATE(s); + sbi->s_mount_state = REISERFS_VALID_FS; + + if ((errval = reiserfs_init_bitmap_cache(s))) { + SWARN(silent, s, "jmacd-8", "unable to read bitmap"); + goto error_unlocked; + } + + errval = -EINVAL; +#ifdef CONFIG_REISERFS_CHECK + SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON"); + SWARN(silent, s, "", "- it is slow mode for debugging."); +#endif + + /* make data=ordered the default */ + if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) && + !reiserfs_data_writeback(s)) { + sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED); + } + + if (reiserfs_data_log(s)) { + reiserfs_info(s, "using journaled data mode\n"); + } else if (reiserfs_data_ordered(s)) { + reiserfs_info(s, "using ordered data mode\n"); + } else { + reiserfs_info(s, "using writeback data mode\n"); + } + if (reiserfs_barrier_flush(s)) { + printk("reiserfs: using flush barriers\n"); + } + + if (journal_init(s, jdev_name, old_format, commit_max_age)) { + SWARN(silent, s, "sh-2022", + "unable to initialize journal space"); + goto error_unlocked; + } else { + /* + * once this is set, journal_release must be called + * if we error out of the mount + */ + jinit_done = 1; + } + + if (reread_meta_blocks(s)) { + SWARN(silent, s, "jmacd-9", + "unable to reread meta blocks after journal init"); + goto error_unlocked; + } + + if (replay_only(s)) + goto error_unlocked; + + if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) { + SWARN(silent, s, "clm-7000", + "Detected readonly device, marking FS readonly"); + s->s_flags |= MS_RDONLY; + } + args.objectid = REISERFS_ROOT_OBJECTID; + args.dirid = REISERFS_ROOT_PARENT_OBJECTID; + root_inode = + iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor, + reiserfs_init_locked_inode, (void *)&args); + if (!root_inode) { + SWARN(silent, s, "jmacd-10", "get root inode failed"); + goto error_unlocked; + } + + /* + * This path assumed to be called with the BKL in the old times. + * Now we have inherited the big reiserfs lock from it and many + * reiserfs helpers called in the mount path and elsewhere require + * this lock to be held even if it's not always necessary. Let's be + * conservative and hold it early. The window can be reduced after + * careful review of the code. + */ + reiserfs_write_lock(s); + + if (root_inode->i_state & I_NEW) { + reiserfs_read_locked_inode(root_inode, &args); + unlock_new_inode(root_inode); + } + + s->s_root = d_make_root(root_inode); + if (!s->s_root) + goto error; + /* define and initialize hash function */ + sbi->s_hash_function = hash_function(s); + if (sbi->s_hash_function == NULL) { + dput(s->s_root); + s->s_root = NULL; + goto error; + } + + if (is_reiserfs_3_5(rs) + || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1)) + set_bit(REISERFS_3_5, &sbi->s_properties); + else if (old_format) + set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties); + else + set_bit(REISERFS_3_6, &sbi->s_properties); + + if (!(s->s_flags & MS_RDONLY)) { + + errval = journal_begin(&th, s, 1); + if (errval) { + dput(s->s_root); + s->s_root = NULL; + goto error; + } + reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1); + + set_sb_umount_state(rs, REISERFS_ERROR_FS); + set_sb_fs_state(rs, 0); + + /* + * Clear out s_bmap_nr if it would wrap. We can handle this + * case, but older revisions can't. This will cause the + * file system to fail mount on those older implementations, + * avoiding corruption. -jeffm + */ + if (bmap_would_wrap(reiserfs_bmap_count(s)) && + sb_bmap_nr(rs) != 0) { + reiserfs_warning(s, "super-2030", "This file system " + "claims to use %u bitmap blocks in " + "its super block, but requires %u. " + "Clearing to zero.", sb_bmap_nr(rs), + reiserfs_bmap_count(s)); + + set_sb_bmap_nr(rs, 0); + } + + if (old_format_only(s)) { + /* + * filesystem of format 3.5 either with standard + * or non-standard journal + */ + if (convert_reiserfs(s)) { + /* and -o conv is given */ + if (!silent) + reiserfs_info(s, + "converting 3.5 filesystem to the 3.6 format"); + + if (is_reiserfs_3_5(rs)) + /* + * put magic string of 3.6 format. + * 2.2 will not be able to + * mount this filesystem anymore + */ + memcpy(rs->s_v1.s_magic, + reiserfs_3_6_magic_string, + sizeof + (reiserfs_3_6_magic_string)); + + set_sb_version(rs, REISERFS_VERSION_2); + reiserfs_convert_objectid_map_v1(s); + set_bit(REISERFS_3_6, &sbi->s_properties); + clear_bit(REISERFS_3_5, &sbi->s_properties); + } else if (!silent) { + reiserfs_info(s, "using 3.5.x disk format\n"); + } + } else + set_sb_mnt_count(rs, sb_mnt_count(rs) + 1); + + + journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s)); + errval = journal_end(&th); + if (errval) { + dput(s->s_root); + s->s_root = NULL; + goto error; + } + + reiserfs_write_unlock(s); + if ((errval = reiserfs_lookup_privroot(s)) || + (errval = reiserfs_xattr_init(s, s->s_flags))) { + dput(s->s_root); + s->s_root = NULL; + goto error_unlocked; + } + reiserfs_write_lock(s); + + /* + * look for files which were to be removed in previous session + */ + finish_unfinished(s); + } else { + if (old_format_only(s) && !silent) { + reiserfs_info(s, "using 3.5.x disk format\n"); + } + + reiserfs_write_unlock(s); + if ((errval = reiserfs_lookup_privroot(s)) || + (errval = reiserfs_xattr_init(s, s->s_flags))) { + dput(s->s_root); + s->s_root = NULL; + goto error_unlocked; + } + reiserfs_write_lock(s); + } + /* + * mark hash in super block: it could be unset. overwrite should be ok + */ + set_sb_hash_function_code(rs, function2code(sbi->s_hash_function)); + + handle_attrs(s); + + reiserfs_proc_info_init(s); + + init_waitqueue_head(&(sbi->s_wait)); + spin_lock_init(&sbi->bitmap_lock); + + reiserfs_write_unlock(s); + + return (0); + +error: + reiserfs_write_unlock(s); + +error_unlocked: + /* kill the commit thread, free journal ram */ + if (jinit_done) { + reiserfs_write_lock(s); + journal_release_error(NULL, s); + reiserfs_write_unlock(s); + } + + if (sbi->commit_wq) + destroy_workqueue(sbi->commit_wq); + + cancel_delayed_work_sync(&REISERFS_SB(s)->old_work); + + reiserfs_free_bitmap_cache(s); + if (SB_BUFFER_WITH_SB(s)) + brelse(SB_BUFFER_WITH_SB(s)); +#ifdef CONFIG_QUOTA + { + int j; + for (j = 0; j < REISERFS_MAXQUOTAS; j++) + kfree(qf_names[j]); + } +#endif + kfree(sbi); + + s->s_fs_info = NULL; + return errval; +} + +static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf) +{ + struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb); + + buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize)); + buf->f_bfree = sb_free_blocks(rs); + buf->f_bavail = buf->f_bfree; + buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1; + buf->f_bsize = dentry->d_sb->s_blocksize; + /* changed to accommodate gcc folks. */ + buf->f_type = REISERFS_SUPER_MAGIC; + buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2); + buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2, + sizeof(rs->s_uuid)/2); + + return 0; +} + +#ifdef CONFIG_QUOTA +static int reiserfs_write_dquot(struct dquot *dquot) +{ + struct reiserfs_transaction_handle th; + int ret, err; + int depth; + + reiserfs_write_lock(dquot->dq_sb); + ret = + journal_begin(&th, dquot->dq_sb, + REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); + if (ret) + goto out; + depth = reiserfs_write_unlock_nested(dquot->dq_sb); + ret = dquot_commit(dquot); + reiserfs_write_lock_nested(dquot->dq_sb, depth); + err = journal_end(&th); + if (!ret && err) + ret = err; +out: + reiserfs_write_unlock(dquot->dq_sb); + return ret; +} + +static int reiserfs_acquire_dquot(struct dquot *dquot) +{ + struct reiserfs_transaction_handle th; + int ret, err; + int depth; + + reiserfs_write_lock(dquot->dq_sb); + ret = + journal_begin(&th, dquot->dq_sb, + REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb)); + if (ret) + goto out; + depth = reiserfs_write_unlock_nested(dquot->dq_sb); + ret = dquot_acquire(dquot); + reiserfs_write_lock_nested(dquot->dq_sb, depth); + err = journal_end(&th); + if (!ret && err) + ret = err; +out: + reiserfs_write_unlock(dquot->dq_sb); + return ret; +} + +static int reiserfs_release_dquot(struct dquot *dquot) +{ + struct reiserfs_transaction_handle th; + int ret, err; + + reiserfs_write_lock(dquot->dq_sb); + ret = + journal_begin(&th, dquot->dq_sb, + REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb)); + reiserfs_write_unlock(dquot->dq_sb); + if (ret) { + /* Release dquot anyway to avoid endless cycle in dqput() */ + dquot_release(dquot); + goto out; + } + ret = dquot_release(dquot); + reiserfs_write_lock(dquot->dq_sb); + err = journal_end(&th); + if (!ret && err) + ret = err; + reiserfs_write_unlock(dquot->dq_sb); +out: + return ret; +} + +static int reiserfs_mark_dquot_dirty(struct dquot *dquot) +{ + /* Are we journaling quotas? */ + if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || + REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { + dquot_mark_dquot_dirty(dquot); + return reiserfs_write_dquot(dquot); + } else + return dquot_mark_dquot_dirty(dquot); +} + +static int reiserfs_write_info(struct super_block *sb, int type) +{ + struct reiserfs_transaction_handle th; + int ret, err; + int depth; + + /* Data block + inode block */ + reiserfs_write_lock(sb); + ret = journal_begin(&th, sb, 2); + if (ret) + goto out; + depth = reiserfs_write_unlock_nested(sb); + ret = dquot_commit_info(sb, type); + reiserfs_write_lock_nested(sb, depth); + err = journal_end(&th); + if (!ret && err) + ret = err; +out: + reiserfs_write_unlock(sb); + return ret; +} + +/* + * Turn on quotas during mount time - we need to find the quota file and such... + */ +static int reiserfs_quota_on_mount(struct super_block *sb, int type) +{ + return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type], + REISERFS_SB(sb)->s_jquota_fmt, type); +} + +/* + * Standard function to be called on quota_on + */ +static int reiserfs_quota_on(struct super_block *sb, int type, int format_id, + struct path *path) +{ + int err; + struct inode *inode; + struct reiserfs_transaction_handle th; + int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA; + + reiserfs_write_lock(sb); + if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) { + err = -EINVAL; + goto out; + } + + /* Quotafile not on the same filesystem? */ + if (path->dentry->d_sb != sb) { + err = -EXDEV; + goto out; + } + inode = d_inode(path->dentry); + /* + * We must not pack tails for quota files on reiserfs for quota + * IO to work + */ + if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) { + err = reiserfs_unpack(inode, NULL); + if (err) { + reiserfs_warning(sb, "super-6520", + "Unpacking tail of quota file failed" + " (%d). Cannot turn on quotas.", err); + err = -EINVAL; + goto out; + } + mark_inode_dirty(inode); + } + /* Journaling quota? */ + if (REISERFS_SB(sb)->s_qf_names[type]) { + /* Quotafile not of fs root? */ + if (path->dentry->d_parent != sb->s_root) + reiserfs_warning(sb, "super-6521", + "Quota file not on filesystem root. " + "Journalled quota will not work."); + } + + /* + * When we journal data on quota file, we have to flush journal to see + * all updates to the file when we bypass pagecache... + */ + if (reiserfs_file_data_log(inode)) { + /* Just start temporary transaction and finish it */ + err = journal_begin(&th, sb, 1); + if (err) + goto out; + err = journal_end_sync(&th); + if (err) + goto out; + } + reiserfs_write_unlock(sb); + return dquot_quota_on(sb, type, format_id, path); +out: + reiserfs_write_unlock(sb); + return err; +} + +/* + * Read data from quotafile - avoid pagecache and such because we cannot afford + * acquiring the locks... As quota files are never truncated and quota code + * itself serializes the operations (and no one else should touch the files) + * we don't have to be afraid of races + */ +static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data, + size_t len, loff_t off) +{ + struct inode *inode = sb_dqopt(sb)->files[type]; + unsigned long blk = off >> sb->s_blocksize_bits; + int err = 0, offset = off & (sb->s_blocksize - 1), tocopy; + size_t toread; + struct buffer_head tmp_bh, *bh; + loff_t i_size = i_size_read(inode); + + if (off > i_size) + return 0; + if (off + len > i_size) + len = i_size - off; + toread = len; + while (toread > 0) { + tocopy = + sb->s_blocksize - offset < + toread ? sb->s_blocksize - offset : toread; + tmp_bh.b_state = 0; + /* + * Quota files are without tails so we can safely + * use this function + */ + reiserfs_write_lock(sb); + err = reiserfs_get_block(inode, blk, &tmp_bh, 0); + reiserfs_write_unlock(sb); + if (err) + return err; + if (!buffer_mapped(&tmp_bh)) /* A hole? */ + memset(data, 0, tocopy); + else { + bh = sb_bread(sb, tmp_bh.b_blocknr); + if (!bh) + return -EIO; + memcpy(data, bh->b_data + offset, tocopy); + brelse(bh); + } + offset = 0; + toread -= tocopy; + data += tocopy; + blk++; + } + return len; +} + +/* + * Write to quotafile (we know the transaction is already started and has + * enough credits) + */ +static ssize_t reiserfs_quota_write(struct super_block *sb, int type, + const char *data, size_t len, loff_t off) +{ + struct inode *inode = sb_dqopt(sb)->files[type]; + unsigned long blk = off >> sb->s_blocksize_bits; + int err = 0, offset = off & (sb->s_blocksize - 1), tocopy; + int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL; + size_t towrite = len; + struct buffer_head tmp_bh, *bh; + + if (!current->journal_info) { + printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n", + (unsigned long long)off, (unsigned long long)len); + return -EIO; + } + while (towrite > 0) { + tocopy = sb->s_blocksize - offset < towrite ? + sb->s_blocksize - offset : towrite; + tmp_bh.b_state = 0; + reiserfs_write_lock(sb); + err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE); + reiserfs_write_unlock(sb); + if (err) + goto out; + if (offset || tocopy != sb->s_blocksize) + bh = sb_bread(sb, tmp_bh.b_blocknr); + else + bh = sb_getblk(sb, tmp_bh.b_blocknr); + if (!bh) { + err = -EIO; + goto out; + } + lock_buffer(bh); + memcpy(bh->b_data + offset, data, tocopy); + flush_dcache_page(bh->b_page); + set_buffer_uptodate(bh); + unlock_buffer(bh); + reiserfs_write_lock(sb); + reiserfs_prepare_for_journal(sb, bh, 1); + journal_mark_dirty(current->journal_info, bh); + if (!journal_quota) + reiserfs_add_ordered_list(inode, bh); + reiserfs_write_unlock(sb); + brelse(bh); + offset = 0; + towrite -= tocopy; + data += tocopy; + blk++; + } +out: + if (len == towrite) + return err; + if (inode->i_size < off + len - towrite) + i_size_write(inode, off + len - towrite); + inode->i_version++; + inode->i_mtime = inode->i_ctime = CURRENT_TIME; + mark_inode_dirty(inode); + return len - towrite; +} + +#endif + +static struct dentry *get_super_block(struct file_system_type *fs_type, + int flags, const char *dev_name, + void *data) +{ + return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super); +} + +static int __init init_reiserfs_fs(void) +{ + int ret; + + ret = init_inodecache(); + if (ret) + return ret; + + reiserfs_proc_info_global_init(); + + ret = register_filesystem(&reiserfs_fs_type); + if (ret) + goto out; + + return 0; +out: + reiserfs_proc_info_global_done(); + destroy_inodecache(); + + return ret; +} + +static void __exit exit_reiserfs_fs(void) +{ + reiserfs_proc_info_global_done(); + unregister_filesystem(&reiserfs_fs_type); + destroy_inodecache(); +} + +struct file_system_type reiserfs_fs_type = { + .owner = THIS_MODULE, + .name = "reiserfs", + .mount = get_super_block, + .kill_sb = reiserfs_kill_sb, + .fs_flags = FS_REQUIRES_DEV, +}; +MODULE_ALIAS_FS("reiserfs"); + +MODULE_DESCRIPTION("ReiserFS journaled filesystem"); +MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>"); +MODULE_LICENSE("GPL"); + +module_init(init_reiserfs_fs); +module_exit(exit_reiserfs_fs); |