diff options
Diffstat (limited to 'fs/reiserfs/super.c')
| -rw-r--r-- | fs/reiserfs/super.c | 2148 |
1 files changed, 2148 insertions, 0 deletions
diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c new file mode 100644 index 000000000000..bcdf2438d152 --- /dev/null +++ b/fs/reiserfs/super.c @@ -0,0 +1,2148 @@ +/* + * 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/config.h> +#include <linux/module.h> +#include <linux/vmalloc.h> +#include <linux/time.h> +#include <asm/uaccess.h> +#include <linux/reiserfs_fs.h> +#include <linux/reiserfs_acl.h> +#include <linux/reiserfs_xattr.h> +#include <linux/smp_lock.h> +#include <linux/init.h> +#include <linux/blkdev.h> +#include <linux/buffer_head.h> +#include <linux/vfs.h> +#include <linux/namespace.h> +#include <linux/mount.h> +#include <linux/namei.h> +#include <linux/quotaops.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 super_block * s, struct kstatfs * buf); + +static int reiserfs_sync_fs (struct super_block * s, int wait) +{ + if (!(s->s_flags & MS_RDONLY)) { + struct reiserfs_transaction_handle th; + reiserfs_write_lock(s); + if (!journal_begin(&th, s, 1)) + if (!journal_end_sync(&th, s, 1)) + reiserfs_flush_old_commits(s); + s->s_dirt = 0; /* Even if it's not true. + * We'll loop forever in sync_supers otherwise */ + reiserfs_write_unlock(s); + } else { + s->s_dirt = 0; + } + return 0; +} + +static void reiserfs_write_super(struct super_block *s) +{ + reiserfs_sync_fs(s, 1); +} + +static void reiserfs_write_super_lockfs (struct super_block * s) +{ + struct reiserfs_transaction_handle th ; + 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, s, SB_BUFFER_WITH_SB (s)); + reiserfs_block_writes(&th) ; + journal_end_sync(&th, s, 1) ; + } + } + s->s_dirt = 0; + reiserfs_write_unlock(s); +} + +static void reiserfs_unlockfs(struct super_block *s) { + reiserfs_allow_writes(s) ; +} + +extern const struct reiserfs_key MAX_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, s, JOURNAL_PER_BALANCE_CNT); +} + +#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; + 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; +#endif + + + /* compose key to look for "save" links */ + max_cpu_key.version = KEY_FORMAT_3_5; + max_cpu_key.on_disk_key = MAX_KEY; + max_cpu_key.key_length = 3; + +#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 < MAXQUOTAS; i++) { + if (REISERFS_SB(s)->s_qf_names[i]) { + int ret = reiserfs_quota_on_mount(s, i); + if (ret < 0) + reiserfs_warning(s, "reiserfs: cannot turn on journalled quota: error %d", ret); + } + } +#endif + + done = 0; + REISERFS_SB(s)->s_is_unlinked_ok = 1; + while (!retval) { + retval = search_item (s, &max_cpu_key, &path); + if (retval != ITEM_NOT_FOUND) { + reiserfs_warning (s, "vs-2140: finish_unfinished: 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: finish_unfinished: wrong position found"); + break; + } + item_pos --; + ih = B_N_PITEM_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 = B_I_PITEM (bh, ih); + obj_key.on_disk_key.k_dir_id = le32_to_cpu (*(__u32 *)item); + obj_key.on_disk_key.k_objectid = le32_to_cpu (ih->ih_key.k_objectid); + obj_key.on_disk_key.u.k_offset_v1.k_offset = 0; + obj_key.on_disk_key.u.k_offset_v1.k_uniqueness = 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: finish_unfinished: 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: finish_unfinished: file %K is not unlinked", + &obj_key); + retval = remove_save_link_only (s, &save_link_key, 0); + continue; + } + DQUOT_INIT(inode); + + 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 %Ld ..", + INODE_PKEY (inode), inode->i_size); + reiserfs_truncate_file (inode, 0/*don't update modification time*/); + 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)); + /* removal gets completed in iput */ + retval = 0; + } + + iput (inode); + printk ("done\n"); + done ++; + } + REISERFS_SB(s)->s_is_unlinked_ok = 0; + +#ifdef CONFIG_QUOTA + /* Turn quotas off */ + for (i = 0; i < MAXQUOTAS; i++) { + if (sb_dqopt(s)->files[i]) + vfs_quota_off_mount(s, i); + } + 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 filesytem 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; + __u32 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_warning (inode->i_sb, "vs-2100: add_save_link:" + "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 inot tree, don't charge quota to anyone */ + retval = reiserfs_insert_item (th, &path, &key, &ih, NULL, (char *)&link); + if (retval) { + if (retval != -ENOSPC) + reiserfs_warning (inode->i_sb, "vs-2120: add_save_link: 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, inode->i_sb, JOURNAL_PER_BALANCE_CNT); +} + + +static void reiserfs_put_super (struct super_block * s) +{ + int i; + struct reiserfs_transaction_handle th ; + th.t_trans_id = 0; + + if (REISERFS_SB(s)->xattr_root) { + d_invalidate (REISERFS_SB(s)->xattr_root); + dput (REISERFS_SB(s)->xattr_root); + } + + if (REISERFS_SB(s)->priv_root) { + d_invalidate (REISERFS_SB(s)->priv_root); + dput (REISERFS_SB(s)->priv_root); + } + + /* 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, s, 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) ; + + for (i = 0; i < SB_BMAP_NR (s); i ++) + brelse (SB_AP_BITMAP (s)[i].bh); + + vfree (SB_AP_BITMAP (s)); + + brelse (SB_BUFFER_WITH_SB (s)); + + print_statistics (s); + + if (REISERFS_SB(s)->s_kmallocs != 0) { + reiserfs_warning (s, "vs-2004: reiserfs_put_super: allocated memory left %d", + REISERFS_SB(s)->s_kmallocs); + } + + if (REISERFS_SB(s)->reserved_blocks != 0) { + reiserfs_warning (s, "green-2005: reiserfs_put_super: reserved blocks left %d", + REISERFS_SB(s)->reserved_blocks); + } + + reiserfs_proc_info_done( s ); + + kfree(s->s_fs_info); + s->s_fs_info = NULL; + + return; +} + +static kmem_cache_t * 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, SLAB_KERNEL); + if (!ei) + return NULL; + return &ei->vfs_inode; +} + +static void reiserfs_destroy_inode(struct inode *inode) +{ + kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode)); +} + +static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) +{ + struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *) foo; + + if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == + SLAB_CTOR_CONSTRUCTOR) { + INIT_LIST_HEAD(&ei->i_prealloc_list) ; + inode_init_once(&ei->vfs_inode); + ei->i_acl_access = NULL; + ei->i_acl_default = NULL; + } +} + +static int init_inodecache(void) +{ + reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache", + sizeof(struct reiserfs_inode_info), + 0, SLAB_RECLAIM_ACCOUNT, + init_once, NULL); + if (reiserfs_inode_cachep == NULL) + return -ENOMEM; + return 0; +} + +static void destroy_inodecache(void) +{ + if (kmem_cache_destroy(reiserfs_inode_cachep)) + reiserfs_warning (NULL, "reiserfs_inode_cache: not all structures were freed"); +} + +/* we don't mark inodes dirty, we just log them */ +static void reiserfs_dirty_inode (struct inode * inode) { + 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) { + reiserfs_write_unlock (inode->i_sb); + return; + } + reiserfs_update_sd (&th, inode); + journal_end(&th, inode->i_sb, 1) ; + reiserfs_write_unlock(inode->i_sb); +} + +static void reiserfs_clear_inode (struct inode *inode) +{ + struct posix_acl *acl; + + acl = REISERFS_I(inode)->i_acl_access; + if (acl && !IS_ERR (acl)) + posix_acl_release (acl); + REISERFS_I(inode)->i_acl_access = NULL; + + acl = REISERFS_I(inode)->i_acl_default; + if (acl && !IS_ERR (acl)) + posix_acl_release (acl); + REISERFS_I(inode)->i_acl_default = NULL; +} + +#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); +#endif + +static 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, + .delete_inode = reiserfs_delete_inode, + .clear_inode = reiserfs_clear_inode, + .put_super = reiserfs_put_super, + .write_super = reiserfs_write_super, + .sync_fs = reiserfs_sync_fs, + .write_super_lockfs = reiserfs_write_super_lockfs, + .unlockfs = reiserfs_unlockfs, + .statfs = reiserfs_statfs, + .remount_fs = reiserfs_remount, +#ifdef CONFIG_QUOTA + .quota_read = reiserfs_quota_read, + .quota_write = reiserfs_quota_write, +#endif +}; + +#ifdef CONFIG_QUOTA +#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") + +static int reiserfs_dquot_initialize(struct inode *, int); +static int reiserfs_dquot_drop(struct inode *); +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, char *); + +static struct dquot_operations reiserfs_quota_operations = +{ + .initialize = reiserfs_dquot_initialize, + .drop = reiserfs_dquot_drop, + .alloc_space = dquot_alloc_space, + .alloc_inode = dquot_alloc_inode, + .free_space = dquot_free_space, + .free_inode = dquot_free_inode, + .transfer = dquot_transfer, + .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, +}; + +static struct quotactl_ops reiserfs_qctl_operations = +{ + .quota_on = reiserfs_quota_on, + .quota_off = vfs_quota_off, + .quota_sync = vfs_quota_sync, + .get_info = vfs_get_dqinfo, + .set_info = vfs_set_dqinfo, + .get_dqblk = vfs_get_dqblk, + .set_dqblk = vfs_set_dqblk, +}; +#endif + +static struct export_operations reiserfs_export_ops = { + .encode_fh = reiserfs_encode_fh, + .decode_fh = reiserfs_decode_fh, + .get_parent = reiserfs_get_parent, + .get_dentry = reiserfs_get_dentry, +} ; + +/* 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; + int setmask; /* bitmask which is to set on mount_options bitmask when this + value is found, 0 is no bits are to be changed. */ + int clrmask; /* 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 */ +} 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; + int arg_required; /* 0 if argument is not required, not 0 otherwise */ + const arg_desc_t * values; /* list of values accepted by an option */ + int setmask; /* bitmask which is to set on mount_options bitmask when this + value is found, 0 is no bits are to be changed. */ + int clrmask; /* 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 */ +} 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)}, + {NULL, 0} +}; + +/* 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}, + {NULL, 0} +}; + +/* 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}, +}; + +int reiserfs_default_io_size = 128 * 1024; /* Default recommended I/O size is 128k. + There might be broken applications that are + confused by this. Use nolargeio mount option + to get usual i/o size = PAGE_SIZE. + */ + +/* 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, "%s not supported.", p); + else + *bit_flags &= ~opt->clrmask; + if (opt->setmask == (1 << REISERFS_UNSUPPORTED_OPT)) + reiserfs_warning (s, "%s not supported.", p); + else + *bit_flags |= opt->setmask; + } + break; + } + } + if (!opt->option_name) { + reiserfs_warning (s, "unknown mount option \"%s\"", p); + return -1; + } + + p += strlen (opt->option_name); + switch (*p) { + case '=': + if (!opt->arg_required) { + reiserfs_warning (s, "the option \"%s\" does not require an argument", + opt->option_name); + return -1; + } + break; + + case 0: + if (opt->arg_required) { + reiserfs_warning (s, "the option \"%s\" requires an argument", opt->option_name); + return -1; + } + break; + default: + reiserfs_warning (s, "head of option \"%s\" is only correct", 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, "empty argument for \"%s\"", 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, "bad value \"%s\" for option \"%s\"", 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, char * options, /* string given via mount's -o */ + unsigned long * mount_options, + /* after the parsing phase, contains the + collection of bitflags defining what + mount options were selected. */ + unsigned long * blocks, /* strtol-ed from NNN of resize=NNN */ + char ** jdev_name, + unsigned int * commit_max_age) +{ + 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}, +#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 + {"nolog",}, /* This is unsupported */ + {"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",}, + {"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}, + {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" */ + *blocks = simple_strtoul (arg, &p, 0); + if (*p != '\0') { + /* NNN does not look like a number */ + reiserfs_warning (s, "reiserfs_parse_options: bad value %s", 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, "reiserfs_parse_options: bad value %s", arg); return 0; + } + *commit_max_age = (unsigned int)val; + } + + if ( c == 'w' ) { + char *p=NULL; + int val = simple_strtoul (arg, &p, 0); + + if ( *p != '\0') { + reiserfs_warning (s, "reiserfs_parse_options: non-numeric value %s for nolargeio option", arg); + return 0; + } + if ( val ) + reiserfs_default_io_size = PAGE_SIZE; + else + reiserfs_default_io_size = 128 * 1024; + } + + if (c == 'j') { + if (arg && *arg && jdev_name) { + if ( *jdev_name ) { //Hm, already assigned? + reiserfs_warning (s, "reiserfs_parse_options: 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_enabled(s)) { + reiserfs_warning(s, "reiserfs_parse_options: cannot change journalled 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, "reiserfs_parse_options: %s quota file already specified.", QTYPE2NAME(qtype)); + return 0; + } + if (strchr(arg, '/')) { + reiserfs_warning(s, "reiserfs_parse_options: quotafile must be on filesystem root."); + return 0; + } + REISERFS_SB(s)->s_qf_names[qtype] = kmalloc(strlen(arg)+1, GFP_KERNEL); + if (!REISERFS_SB(s)->s_qf_names[qtype]) { + reiserfs_warning(s, "reiserfs_parse_options: not enough memory for storing quotafile name."); + return 0; + } + strcpy(REISERFS_SB(s)->s_qf_names[qtype], arg); + } + else { + if (REISERFS_SB(s)->s_qf_names[qtype]) { + kfree(REISERFS_SB(s)->s_qf_names[qtype]); + REISERFS_SB(s)->s_qf_names[qtype] = NULL; + } + } + } + if (c == 'f') { + if (!strcmp(arg, "vfsold")) + REISERFS_SB(s)->s_jquota_fmt = QFMT_VFS_OLD; + else if (!strcmp(arg, "vfsv0")) + REISERFS_SB(s)->s_jquota_fmt = QFMT_VFS_V0; + else { + reiserfs_warning(s, "reiserfs_parse_options: unknown quota format specified."); + return 0; + } + } +#else + if (c == 'u' || c == 'g' || c == 'f') { + reiserfs_warning(s, "reiserfs_parse_options: journalled quota options not supported."); + return 0; + } +#endif + } + +#ifdef CONFIG_QUOTA + if (!REISERFS_SB(s)->s_jquota_fmt && (REISERFS_SB(s)->s_qf_names[USRQUOTA] || REISERFS_SB(s)->s_qf_names[GRPQUOTA])) { + reiserfs_warning(s, "reiserfs_parse_options: journalled quota format not specified."); + 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; + + if( reiserfs_attrs( s ) ) { + rs = SB_DISK_SUPER_BLOCK (s); + if( old_format_only(s) ) { + reiserfs_warning(s, "reiserfs: 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, "reiserfs: cannot support attributes until flag is set in super-block" ); + REISERFS_SB(s) -> s_mount_opt &= ~ ( 1 << REISERFS_ATTRS ); + } + } +} + +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); + int err; +#ifdef CONFIG_QUOTA + int i; +#endif + + rs = SB_DISK_SUPER_BLOCK (s); + + if (!reiserfs_parse_options(s, arg, &mount_options, &blocks, NULL, &commit_max_age)) { +#ifdef CONFIG_QUOTA + for (i = 0; i < MAXQUOTAS; i++) + if (REISERFS_SB(s)->s_qf_names[i]) { + kfree(REISERFS_SB(s)->s_qf_names[i]); + REISERFS_SB(s)->s_qf_names[i] = NULL; + } +#endif + return -EINVAL; + } + + 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; + + /* 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) { + int rc = reiserfs_resize(s, blocks); + if (rc != 0) + return rc; + } + + if (*mount_flags & MS_RDONLY) { + reiserfs_xattr_init (s, *mount_flags); + /* remount read-only */ + if (s->s_flags & MS_RDONLY) + /* it is read-only already */ + return 0; + /* 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) { + return 0; + } + + err = journal_begin(&th, s, 10) ; + if (err) + return err; + + /* 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, s, SB_BUFFER_WITH_SB (s)); + } else { + /* remount read-write */ + if (!(s->s_flags & MS_RDONLY)) { + reiserfs_xattr_init (s, *mount_flags); + return 0; /* We are read-write already */ + } + + if (reiserfs_is_journal_aborted (journal)) + return journal->j_errno; + + handle_data_mode(s, mount_options); + handle_barrier_mode(s, mount_options); + REISERFS_SB(s)->s_mount_state = sb_umount_state(rs) ; + s->s_flags &= ~MS_RDONLY ; /* now it is safe to call journal_begin */ + err = journal_begin(&th, s, 10) ; + if (err) + return err; + + /* 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 ); + /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */ + journal_mark_dirty(&th, s, 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, s, 10) ; + if (err) + return err; + s->s_dirt = 0; + + if (!( *mount_flags & MS_RDONLY ) ) { + finish_unfinished( s ); + reiserfs_xattr_init (s, *mount_flags); + } + + return 0; +} + +/* load_bitmap_info_data - Sets up the reiserfs_bitmap_info structure from disk. + * @sb - superblock for this filesystem + * @bi - the bitmap info to be loaded. Requires that bi->bh is valid. + * + * This routine counts how many free bits there are, finding the first zero + * as a side effect. Could also be implemented as a loop of test_bit() calls, or + * a loop of find_first_zero_bit() calls. This implementation is similar to + * find_first_zero_bit(), but doesn't return after it finds the first bit. + * Should only be called on fs mount, but should be fairly efficient anyways. + * + * bi->first_zero_hint is considered unset if it == 0, since the bitmap itself + * will * invariably occupt block 0 represented in the bitmap. The only + * exception to this is when free_count also == 0, since there will be no + * free blocks at all. + */ + +static void load_bitmap_info_data (struct super_block *sb, + struct reiserfs_bitmap_info *bi) +{ + unsigned long *cur = (unsigned long *)bi->bh->b_data; + + while ((char *)cur < (bi->bh->b_data + sb->s_blocksize)) { + + /* No need to scan if all 0's or all 1's. + * Since we're only counting 0's, we can simply ignore all 1's */ + if (*cur == 0) { + if (bi->first_zero_hint == 0) { + bi->first_zero_hint = ((char *)cur - bi->bh->b_data) << 3; + } + bi->free_count += sizeof(unsigned long)*8; + } else if (*cur != ~0L) { + int b; + for (b = 0; b < sizeof(unsigned long)*8; b++) { + if (!reiserfs_test_le_bit (b, cur)) { + bi->free_count ++; + if (bi->first_zero_hint == 0) + bi->first_zero_hint = + (((char *)cur - bi->bh->b_data) << 3) + b; + } + } + } + cur ++; + } + +#ifdef CONFIG_REISERFS_CHECK +// This outputs a lot of unneded info on big FSes +// reiserfs_warning ("bitmap loaded from block %d: %d free blocks", +// bi->bh->b_blocknr, bi->free_count); +#endif +} + +static int read_bitmaps (struct super_block * s) +{ + int i, bmap_nr; + + SB_AP_BITMAP (s) = vmalloc (sizeof (struct reiserfs_bitmap_info) * SB_BMAP_NR(s)); + if (SB_AP_BITMAP (s) == 0) + return 1; + memset (SB_AP_BITMAP (s), 0, sizeof (struct reiserfs_bitmap_info) * SB_BMAP_NR(s)); + for (i = 0, bmap_nr = REISERFS_DISK_OFFSET_IN_BYTES / s->s_blocksize + 1; + i < SB_BMAP_NR(s); i++, bmap_nr = s->s_blocksize * 8 * i) { + SB_AP_BITMAP (s)[i].bh = sb_getblk(s, bmap_nr); + if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh)) + ll_rw_block(READ, 1, &SB_AP_BITMAP(s)[i].bh); + } + for (i = 0; i < SB_BMAP_NR(s); i++) { + wait_on_buffer(SB_AP_BITMAP (s)[i].bh); + if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh)) { + reiserfs_warning(s,"sh-2029: reiserfs read_bitmaps: " + "bitmap block (#%lu) reading failed", + SB_AP_BITMAP(s)[i].bh->b_blocknr); + for (i = 0; i < SB_BMAP_NR(s); i++) + brelse(SB_AP_BITMAP(s)[i].bh); + vfree(SB_AP_BITMAP(s)); + SB_AP_BITMAP(s) = NULL; + return 1; + } + load_bitmap_info_data (s, SB_AP_BITMAP (s) + i); + } + return 0; +} + +static int read_old_bitmaps (struct super_block * s) +{ + int i ; + struct reiserfs_super_block * rs = SB_DISK_SUPER_BLOCK(s); + int bmp1 = (REISERFS_OLD_DISK_OFFSET_IN_BYTES / s->s_blocksize) + 1; /* first of bitmap blocks */ + + /* read true bitmap */ + SB_AP_BITMAP (s) = vmalloc (sizeof (struct reiserfs_buffer_info *) * sb_bmap_nr(rs)); + if (SB_AP_BITMAP (s) == 0) + return 1; + + memset (SB_AP_BITMAP (s), 0, sizeof (struct reiserfs_buffer_info *) * sb_bmap_nr(rs)); + + for (i = 0; i < sb_bmap_nr(rs); i ++) { + SB_AP_BITMAP (s)[i].bh = sb_bread (s, bmp1 + i); + if (!SB_AP_BITMAP (s)[i].bh) + return 1; + load_bitmap_info_data (s, SB_AP_BITMAP (s) + i); + } + + return 0; +} + +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: read_super_block: " + "bread failed (dev %s, block %lu, size %lu)", + reiserfs_bdevname (s), 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: read_super_block: " + "bread failed (dev %s, block %lu, size %lu)\n", + reiserfs_bdevname (s), 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: read_super_block: " + "can't find a reiserfs filesystem on (dev %s, block %Lu, size %lu)\n", + reiserfs_bdevname (s), (unsigned long long)bh->b_blocknr, s->s_blocksize); + brelse (bh); + return 1; + } + + if ( rs->s_v1.s_root_block == -1 ) { + brelse(bh) ; + reiserfs_warning (s, "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; + + if (is_reiserfs_jr (rs)) { + /* magic is of non-standard journal filesystem, look at s_version to + find which format is in use */ + if (sb_version(rs) == REISERFS_VERSION_2) + reiserfs_warning (s, "read_super_block: found reiserfs format \"3.6\"" + " with non-standard journal"); + else if (sb_version(rs) == REISERFS_VERSION_1) + reiserfs_warning (s, "read_super_block: found reiserfs format \"3.5\"" + " with non-standard journal"); + else { + reiserfs_warning (s, "sh-2012: read_super_block: 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; +#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) { + int i ; + 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, "reread_meta_blocks, error reading the super") ; + return 1 ; + } + + for (i = 0; i < SB_BMAP_NR(s) ; i++) { + ll_rw_block(READ, 1, &(SB_AP_BITMAP(s)[i].bh)) ; + wait_on_buffer(SB_AP_BITMAP(s)[i].bh) ; + if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh)) { + reiserfs_warning (s, "reread_meta_blocks, error reading bitmap block number %d at %llu", + i, (unsigned long long)SB_AP_BITMAP(s)[i].bh->b_blocknr) ; + 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 +// bith 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; + __u32 hash = DEFAULT_HASH; + + inode = s->s_root->d_inode; + + do { // Some serious "goto"-hater was there ;) + u32 teahash, r5hash, yurahash; + + 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); + if (deh_offset( &(de.de_deh[de.de_entry_num]) ) == DOT_DOT_OFFSET) { + /* allow override in this case */ + if (reiserfs_rupasov_hash(s)) { + hash = YURA_HASH ; + } + reiserfs_warning(s,"FS seems to be empty, autodetect " + "is using the default hash"); + break; + } + 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) && (GET_HASH_VALUE( deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash) ) || + ( (teahash == yurahash) && (yurahash == GET_HASH_VALUE( deh_offset(&(de.de_deh[de.de_entry_num])))) ) || + ( (r5hash == yurahash) && (yurahash == GET_HASH_VALUE( deh_offset(&(de.de_deh[de.de_entry_num])))) ) ) { + reiserfs_warning(s,"Unable to automatically detect hash function. " + "Please mount with -o hash={tea,rupasov,r5}", + reiserfs_bdevname (s)); + hash = UNSET_HASH; + break; + } + if (GET_HASH_VALUE( deh_offset(&(de.de_deh[de.de_entry_num])) ) == yurahash) + hash = YURA_HASH; + else if (GET_HASH_VALUE( deh_offset(&(de.de_deh[de.de_entry_num])) ) == teahash) + hash = TEA_HASH; + else if (GET_HASH_VALUE( deh_offset(&(de.de_deh[de.de_entry_num])) ) == r5hash) + hash = R5_HASH; + else { + reiserfs_warning (s,"Unrecognised hash function"); + hash = UNSET_HASH; + } + } while (0); + + 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, "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, "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, "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, ...) \ + if (!(silent)) \ + reiserfs_warning (s, __VA_ARGS__) + +static int reiserfs_fill_super (struct super_block * s, void * data, int silent) +{ + struct inode *root_inode; + int j; + 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; + + sbi = kmalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL); + if (!sbi) { + errval = -ENOMEM; + goto error; + } + s->s_fs_info = sbi; + memset (sbi, 0, sizeof (struct reiserfs_sb_info)); + /* Set default values for options: non-aggressive tails, RO on errors */ + REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL); + REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO); + /* no preallocation minimum, be smart in + reiserfs_file_write instead */ + REISERFS_SB(s)->s_alloc_options.preallocmin = 0; + /* Preallocate by 16 blocks (17-1) at once */ + REISERFS_SB(s)->s_alloc_options.preallocsize = 17; + /* Initialize the rwsem for xattr dir */ + init_rwsem(&REISERFS_SB(s)->xattr_dir_sem); + + /* setup default block allocator options */ + reiserfs_init_alloc_options(s); + + jdev_name = NULL; + if (reiserfs_parse_options (s, (char *) data, &(sbi->s_mount_opt), &blocks, &jdev_name, &commit_max_age) == 0) { + goto error; + } + + if (blocks) { + SWARN (silent, s, "jmacd-7: reiserfs_fill_super: resize option " + "for remount only"); + goto error; + } + + /* 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: reiserfs_fill_super: can not find reiserfs on %s", reiserfs_bdevname (s)); + goto error; + } + + 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 on %s cannot be mounted because it is bigger than the device", reiserfs_bdevname(s)); + 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; + } + + sbi->s_mount_state = SB_REISERFS_STATE(s); + sbi->s_mount_state = REISERFS_VALID_FS ; + + if (old_format ? read_old_bitmaps(s) : read_bitmaps(s)) { + SWARN(silent, s, "jmacd-8: reiserfs_fill_super: unable to read bitmap"); + goto error; + } +#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)) + { + REISERFS_SB(s)->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"); + } + + // set_device_ro(s->s_dev, 1) ; + if( journal_init(s, jdev_name, old_format, commit_max_age) ) { + SWARN(silent, s, "sh-2022: reiserfs_fill_super: unable to initialize journal space") ; + goto error ; + } else { + jinit_done = 1 ; /* once this is set, journal_release must be called + ** if we error out of the mount + */ + } + if (reread_meta_blocks(s)) { + SWARN(silent, s, "jmacd-9: reiserfs_fill_super: unable to reread meta blocks after journal init") ; + goto error ; + } + + if (replay_only (s)) + goto error; + + 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: reiserfs_fill_super: get root inode failed"); + goto error; + } + + if (root_inode->i_state & I_NEW) { + reiserfs_read_locked_inode(root_inode, &args); + unlock_new_inode(root_inode); + } + + s->s_root = d_alloc_root(root_inode); + if (!s->s_root) { + iput(root_inode); + 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 + 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); + + 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") ; + } + } + + journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB (s)); + errval = journal_end(&th, s, 1) ; + if (errval) { + dput (s->s_root); + s->s_root = NULL; + goto error; + } + + if ((errval = reiserfs_xattr_init (s, s->s_flags))) { + dput (s->s_root); + s->s_root = NULL; + goto error; + } + + /* 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") ; + } + + if ((errval = reiserfs_xattr_init (s, s->s_flags))) { + dput (s->s_root); + s->s_root = NULL; + goto error; + } + } + // 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); + + return (0); + + error: + if (jinit_done) { /* kill the commit thread, free journal ram */ + journal_release_error(NULL, s) ; + } + if (SB_DISK_SUPER_BLOCK (s)) { + for (j = 0; j < SB_BMAP_NR (s); j ++) { + if (SB_AP_BITMAP (s)) + brelse (SB_AP_BITMAP (s)[j].bh); + } + if (SB_AP_BITMAP (s)) + vfree (SB_AP_BITMAP (s)); + } + if (SB_BUFFER_WITH_SB (s)) + brelse(SB_BUFFER_WITH_SB (s)); +#ifdef CONFIG_QUOTA + for (j = 0; j < MAXQUOTAS; j++) { + if (sbi->s_qf_names[j]) + kfree(sbi->s_qf_names[j]); + } +#endif + if (sbi != NULL) { + kfree(sbi); + } + + s->s_fs_info = NULL; + return errval; +} + + +static int reiserfs_statfs (struct super_block * s, struct kstatfs * buf) +{ + struct reiserfs_super_block * rs = SB_DISK_SUPER_BLOCK (s); + + 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 = s->s_blocksize; + /* changed to accommodate gcc folks.*/ + buf->f_type = REISERFS_SUPER_MAGIC; + return 0; +} + +#ifdef CONFIG_QUOTA +static int reiserfs_dquot_initialize(struct inode *inode, int type) +{ + struct reiserfs_transaction_handle th; + int ret; + + /* We may create quota structure so we need to reserve enough blocks */ + reiserfs_write_lock(inode->i_sb); + journal_begin(&th, inode->i_sb, 2*REISERFS_QUOTA_INIT_BLOCKS); + ret = dquot_initialize(inode, type); + journal_end(&th, inode->i_sb, 2*REISERFS_QUOTA_INIT_BLOCKS); + reiserfs_write_unlock(inode->i_sb); + return ret; +} + +static int reiserfs_dquot_drop(struct inode *inode) +{ + struct reiserfs_transaction_handle th; + int ret; + + /* We may delete quota structure so we need to reserve enough blocks */ + reiserfs_write_lock(inode->i_sb); + journal_begin(&th, inode->i_sb, 2*REISERFS_QUOTA_INIT_BLOCKS); + ret = dquot_drop(inode); + journal_end(&th, inode->i_sb, 2*REISERFS_QUOTA_INIT_BLOCKS); + reiserfs_write_unlock(inode->i_sb); + return ret; +} + +static int reiserfs_write_dquot(struct dquot *dquot) +{ + struct reiserfs_transaction_handle th; + int ret; + + reiserfs_write_lock(dquot->dq_sb); + journal_begin(&th, dquot->dq_sb, REISERFS_QUOTA_TRANS_BLOCKS); + ret = dquot_commit(dquot); + journal_end(&th, dquot->dq_sb, REISERFS_QUOTA_TRANS_BLOCKS); + reiserfs_write_unlock(dquot->dq_sb); + return ret; +} + +static int reiserfs_acquire_dquot(struct dquot *dquot) +{ + struct reiserfs_transaction_handle th; + int ret; + + reiserfs_write_lock(dquot->dq_sb); + journal_begin(&th, dquot->dq_sb, REISERFS_QUOTA_INIT_BLOCKS); + ret = dquot_acquire(dquot); + journal_end(&th, dquot->dq_sb, REISERFS_QUOTA_INIT_BLOCKS); + reiserfs_write_unlock(dquot->dq_sb); + return ret; +} + +static int reiserfs_release_dquot(struct dquot *dquot) +{ + struct reiserfs_transaction_handle th; + int ret; + + reiserfs_write_lock(dquot->dq_sb); + journal_begin(&th, dquot->dq_sb, REISERFS_QUOTA_INIT_BLOCKS); + ret = dquot_release(dquot); + journal_end(&th, dquot->dq_sb, REISERFS_QUOTA_INIT_BLOCKS); + reiserfs_write_unlock(dquot->dq_sb); + return ret; +} + +static int reiserfs_mark_dquot_dirty(struct dquot *dquot) +{ + /* Are we journalling 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; + + /* Data block + inode block */ + reiserfs_write_lock(sb); + journal_begin(&th, sb, 2); + ret = dquot_commit_info(sb, type); + journal_end(&th, sb, 2); + 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) +{ + int err; + struct dentry *dentry; + struct qstr name = { .name = REISERFS_SB(sb)->s_qf_names[type], + .hash = 0, + .len = strlen(REISERFS_SB(sb)->s_qf_names[type])}; + + dentry = lookup_hash(&name, sb->s_root); + if (IS_ERR(dentry)) + return PTR_ERR(dentry); + err = vfs_quota_on_mount(type, REISERFS_SB(sb)->s_jquota_fmt, dentry); + /* Now invalidate and put the dentry - quota got its own reference + * to inode and dentry has at least wrong hash so we had better + * throw it away */ + d_invalidate(dentry); + dput(dentry); + return err; +} + +/* + * Standard function to be called on quota_on + */ +static int reiserfs_quota_on(struct super_block *sb, int type, int format_id, char *path) +{ + int err; + struct nameidata nd; + + err = path_lookup(path, LOOKUP_FOLLOW, &nd); + if (err) + return err; + /* Quotafile not on the same filesystem? */ + if (nd.mnt->mnt_sb != sb) { + path_release(&nd); + return -EXDEV; + } + /* We must not pack tails for quota files on reiserfs for quota IO to work */ + if (!REISERFS_I(nd.dentry->d_inode)->i_flags & i_nopack_mask) { + reiserfs_warning(sb, "reiserfs: Quota file must have tail packing disabled."); + path_release(&nd); + return -EINVAL; + } + /* Not journalling quota? No more tests needed... */ + if (!REISERFS_SB(sb)->s_qf_names[USRQUOTA] && + !REISERFS_SB(sb)->s_qf_names[GRPQUOTA]) { + path_release(&nd); + return vfs_quota_on(sb, type, format_id, path); + } + /* Quotafile not of fs root? */ + if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode) + reiserfs_warning(sb, "reiserfs: Quota file not on filesystem root. " + "Journalled quota will not work."); + path_release(&nd); + return vfs_quota_on(sb, type, format_id, path); +} + +/* 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 noone 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; + + down(&inode->i_sem); + while (towrite > 0) { + tocopy = sb->s_blocksize - offset < towrite ? + sb->s_blocksize - offset : towrite; + tmp_bh.b_state = 0; + err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE); + 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_prepare_for_journal(sb, bh, 1); + journal_mark_dirty(current->journal_info, sb, bh); + if (!journal_quota) + reiserfs_add_ordered_list(inode, bh); + 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); + up(&inode->i_sem); + return len - towrite; +} + +#endif + +static struct super_block* +get_super_block (struct file_system_type *fs_type, int flags, + const char *dev_name, void *data) +{ + return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super); +} + +static int __init +init_reiserfs_fs ( void ) +{ + int ret; + + if ((ret = init_inodecache ())) { + return ret; + } + + if ((ret = reiserfs_xattr_register_handlers ())) + goto failed_reiserfs_xattr_register_handlers; + + reiserfs_proc_info_global_init (); + reiserfs_proc_register_global ("version", reiserfs_global_version_in_proc); + + ret = register_filesystem (& reiserfs_fs_type); + + if (ret == 0) { + return 0; + } + + reiserfs_xattr_unregister_handlers (); + +failed_reiserfs_xattr_register_handlers: + reiserfs_proc_unregister_global ("version"); + reiserfs_proc_info_global_done (); + destroy_inodecache (); + + return ret; +} + +static void __exit +exit_reiserfs_fs ( void ) +{ + reiserfs_xattr_unregister_handlers (); + reiserfs_proc_unregister_global ("version"); + reiserfs_proc_info_global_done (); + unregister_filesystem (& reiserfs_fs_type); + destroy_inodecache (); +} + +struct file_system_type reiserfs_fs_type = { + .owner = THIS_MODULE, + .name = "reiserfs", + .get_sb = get_super_block, + .kill_sb = kill_block_super, + .fs_flags = FS_REQUIRES_DEV, +}; + +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); |