/* * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README */ #include <linux/string.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/reiserfs_fs.h> #include <linux/stat.h> #include <linux/buffer_head.h> #include <asm/uaccess.h> extern const struct reiserfs_key MIN_KEY; static int reiserfs_readdir(struct file *, void *, filldir_t); static int reiserfs_dir_fsync(struct file *filp, struct dentry *dentry, int datasync); const struct file_operations reiserfs_dir_operations = { .read = generic_read_dir, .readdir = reiserfs_readdir, .fsync = reiserfs_dir_fsync, .ioctl = reiserfs_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = reiserfs_compat_ioctl, #endif }; static int reiserfs_dir_fsync(struct file *filp, struct dentry *dentry, int datasync) { struct inode *inode = dentry->d_inode; int err; reiserfs_write_lock(inode->i_sb); err = reiserfs_commit_for_inode(inode); reiserfs_write_unlock(inode->i_sb); if (err < 0) return err; return 0; } #define store_ih(where,what) copy_item_head (where, what) // static int reiserfs_readdir(struct file *filp, void *dirent, filldir_t filldir) { struct inode *inode = filp->f_path.dentry->d_inode; struct cpu_key pos_key; /* key of current position in the directory (key of directory entry) */ INITIALIZE_PATH(path_to_entry); struct buffer_head *bh; int item_num, entry_num; const struct reiserfs_key *rkey; struct item_head *ih, tmp_ih; int search_res; char *local_buf; loff_t next_pos; char small_buf[32]; /* avoid kmalloc if we can */ struct reiserfs_dir_entry de; int ret = 0; reiserfs_write_lock(inode->i_sb); reiserfs_check_lock_depth(inode->i_sb, "readdir"); /* form key for search the next directory entry using f_pos field of file structure */ make_cpu_key(&pos_key, inode, (filp->f_pos) ? (filp->f_pos) : DOT_OFFSET, TYPE_DIRENTRY, 3); next_pos = cpu_key_k_offset(&pos_key); /* reiserfs_warning (inode->i_sb, "reiserfs_readdir 1: f_pos = %Ld", filp->f_pos); */ path_to_entry.reada = PATH_READA; while (1) { research: /* search the directory item, containing entry with specified key */ search_res = search_by_entry_key(inode->i_sb, &pos_key, &path_to_entry, &de); if (search_res == IO_ERROR) { // FIXME: we could just skip part of directory which could // not be read ret = -EIO; goto out; } entry_num = de.de_entry_num; bh = de.de_bh; item_num = de.de_item_num; ih = de.de_ih; store_ih(&tmp_ih, ih); /* we must have found item, that is item of this directory, */ RFALSE(COMP_SHORT_KEYS(&(ih->ih_key), &pos_key), "vs-9000: found item %h does not match to dir we readdir %K", ih, &pos_key); RFALSE(item_num > B_NR_ITEMS(bh) - 1, "vs-9005 item_num == %d, item amount == %d", item_num, B_NR_ITEMS(bh)); /* and entry must be not more than number of entries in the item */ RFALSE(I_ENTRY_COUNT(ih) < entry_num, "vs-9010: entry number is too big %d (%d)", entry_num, I_ENTRY_COUNT(ih)); if (search_res == POSITION_FOUND || entry_num < I_ENTRY_COUNT(ih)) { /* go through all entries in the directory item beginning from the entry, that has been found */ struct reiserfs_de_head *deh = B_I_DEH(bh, ih) + entry_num; for (; entry_num < I_ENTRY_COUNT(ih); entry_num++, deh++) { int d_reclen; char *d_name; off_t d_off; ino_t d_ino; if (!de_visible(deh)) /* it is hidden entry */ continue; d_reclen = entry_length(bh, ih, entry_num); d_name = B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh); if (d_reclen <= 0 || d_name + d_reclen > bh->b_data + bh->b_size) { /* There is corrupted data in entry, * We'd better stop here */ pathrelse(&path_to_entry); ret = -EIO; goto out; } if (!d_name[d_reclen - 1]) d_reclen = strlen(d_name); if (d_reclen > REISERFS_MAX_NAME(inode->i_sb-> s_blocksize)) { /* too big to send back to VFS */ continue; } /* Ignore the .reiserfs_priv entry */ if (reiserfs_xattrs(inode->i_sb) && !old_format_only(inode->i_sb) && filp->f_path.dentry == inode->i_sb->s_root && REISERFS_SB(inode->i_sb)->priv_root && REISERFS_SB(inode->i_sb)->priv_root->d_inode && deh_objectid(deh) == le32_to_cpu(INODE_PKEY (REISERFS_SB(inode->i_sb)-> priv_root->d_inode)-> k_objectid)) { continue; } d_off = deh_offset(deh); filp->f_pos = d_off; d_ino = deh_objectid(deh); if (d_reclen <= 32) { local_buf = small_buf; } else { local_buf = kmalloc(d_reclen, GFP_NOFS); if (!local_buf) { pathrelse(&path_to_entry); ret = -ENOMEM; goto out; } if (item_moved(&tmp_ih, &path_to_entry)) { kfree(local_buf); goto research; } } // Note, that we copy name to user space via temporary // buffer (local_buf) because filldir will block if // user space buffer is swapped out. At that time // entry can move to somewhere else memcpy(local_buf, d_name, d_reclen); if (filldir (dirent, local_buf, d_reclen, d_off, d_ino, DT_UNKNOWN) < 0) { if (local_buf != small_buf) { kfree(local_buf); } goto end; } if (local_buf != small_buf) { kfree(local_buf); } // next entry should be looked for with such offset next_pos = deh_offset(deh) + 1; if (item_moved(&tmp_ih, &path_to_entry)) { goto research; } } /* for */ } if (item_num != B_NR_ITEMS(bh) - 1) // end of directory has been reached goto end; /* item we went through is last item of node. Using right delimiting key check is it directory end */ rkey = get_rkey(&path_to_entry, inode->i_sb); if (!comp_le_keys(rkey, &MIN_KEY)) { /* set pos_key to key, that is the smallest and greater that key of the last entry in the item */ set_cpu_key_k_offset(&pos_key, next_pos); continue; } if (COMP_SHORT_KEYS(rkey, &pos_key)) { // end of directory has been reached goto end; } /* directory continues in the right neighboring block */ set_cpu_key_k_offset(&pos_key, le_key_k_offset(KEY_FORMAT_3_5, rkey)); } /* while */ end: filp->f_pos = next_pos; pathrelse(&path_to_entry); reiserfs_check_path(&path_to_entry); out: reiserfs_write_unlock(inode->i_sb); return ret; } /* compose directory item containing "." and ".." entries (entries are not aligned to 4 byte boundary) */ /* the last four params are LE */ void make_empty_dir_item_v1(char *body, __le32 dirid, __le32 objid, __le32 par_dirid, __le32 par_objid) { struct reiserfs_de_head *deh; memset(body, 0, EMPTY_DIR_SIZE_V1); deh = (struct reiserfs_de_head *)body; /* direntry header of "." */ put_deh_offset(&(deh[0]), DOT_OFFSET); /* these two are from make_le_item_head, and are are LE */ deh[0].deh_dir_id = dirid; deh[0].deh_objectid = objid; deh[0].deh_state = 0; /* Endian safe if 0 */ put_deh_location(&(deh[0]), EMPTY_DIR_SIZE_V1 - strlen(".")); mark_de_visible(&(deh[0])); /* direntry header of ".." */ put_deh_offset(&(deh[1]), DOT_DOT_OFFSET); /* key of ".." for the root directory */ /* these two are from the inode, and are are LE */ deh[1].deh_dir_id = par_dirid; deh[1].deh_objectid = par_objid; deh[1].deh_state = 0; /* Endian safe if 0 */ put_deh_location(&(deh[1]), deh_location(&(deh[0])) - strlen("..")); mark_de_visible(&(deh[1])); /* copy ".." and "." */ memcpy(body + deh_location(&(deh[0])), ".", 1); memcpy(body + deh_location(&(deh[1])), "..", 2); } /* compose directory item containing "." and ".." entries */ void make_empty_dir_item(char *body, __le32 dirid, __le32 objid, __le32 par_dirid, __le32 par_objid) { struct reiserfs_de_head *deh; memset(body, 0, EMPTY_DIR_SIZE); deh = (struct reiserfs_de_head *)body; /* direntry header of "." */ put_deh_offset(&(deh[0]), DOT_OFFSET); /* these two are from make_le_item_head, and are are LE */ deh[0].deh_dir_id = dirid; deh[0].deh_objectid = objid; deh[0].deh_state = 0; /* Endian safe if 0 */ put_deh_location(&(deh[0]), EMPTY_DIR_SIZE - ROUND_UP(strlen("."))); mark_de_visible(&(deh[0])); /* direntry header of ".." */ put_deh_offset(&(deh[1]), DOT_DOT_OFFSET); /* key of ".." for the root directory */ /* these two are from the inode, and are are LE */ deh[1].deh_dir_id = par_dirid; deh[1].deh_objectid = par_objid; deh[1].deh_state = 0; /* Endian safe if 0 */ put_deh_location(&(deh[1]), deh_location(&(deh[0])) - ROUND_UP(strlen(".."))); mark_de_visible(&(deh[1])); /* copy ".." and "." */ memcpy(body + deh_location(&(deh[0])), ".", 1); memcpy(body + deh_location(&(deh[1])), "..", 2); }