/* * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README */ #include #include #include #include #include #include #include #include #include extern 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) ; struct file_operations reiserfs_dir_operations = { .read = generic_read_dir, .readdir = reiserfs_readdir, .fsync = reiserfs_dir_fsync, .ioctl = reiserfs_ioctl, }; 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_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_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_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 = reiserfs_kmalloc(d_reclen, GFP_NOFS, inode->i_sb) ; if (!local_buf) { pathrelse (&path_to_entry); ret = -ENOMEM ; goto out; } if (item_moved (&tmp_ih, &path_to_entry)) { reiserfs_kfree(local_buf, d_reclen, inode->i_sb) ; 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) { reiserfs_kfree(local_buf, d_reclen, inode->i_sb) ; } goto end; } if (local_buf != small_buf) { reiserfs_kfree(local_buf, d_reclen, inode->i_sb) ; } // 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, __u32 dirid, __u32 objid, __u32 par_dirid, __u32 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, __u32 dirid, __u32 objid, __u32 par_dirid, __u32 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); }