int reiserfs_readdir_dentry(struct dentry *dentry, void *dirent, filldir_t filldir, loff_t *pos) { struct inode *inode = dentry->d_inode; struct cpu_key pos_key; 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]; struct reiserfs_dir_entry de; int ret = 0; reiserfs_write_lock(inode->i_sb); reiserfs_check_lock_depth(inode->i_sb, "readdir"); make_cpu_key(&pos_key, inode, *pos ?: DOT_OFFSET, TYPE_DIRENTRY, 3); next_pos = cpu_key_k_offset(&pos_key); path_to_entry.reada = PATH_READA; while (1) { research: search_res = search_by_entry_key(inode->i_sb, &pos_key, &path_to_entry, &de); if (search_res == IO_ERROR) { 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); 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)); 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)) { 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)) 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) { 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)) { continue; } if (is_privroot_deh(dentry, deh)) continue; d_off = deh_offset(deh); *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; } } memcpy(local_buf, d_name, d_reclen); reiserfs_write_unlock(inode->i_sb); if (filldir (dirent, local_buf, d_reclen, d_off, d_ino, DT_UNKNOWN) < 0) { reiserfs_write_lock(inode->i_sb); if (local_buf != small_buf) { kfree(local_buf); } goto end; } reiserfs_write_lock(inode->i_sb); if (local_buf != small_buf) { kfree(local_buf); } next_pos = deh_offset(deh) + 1; if (item_moved(&tmp_ih, &path_to_entry)) { goto research; } } } if (item_num != B_NR_ITEMS(bh) - 1) goto end; rkey = get_rkey(&path_to_entry, inode->i_sb); if (!comp_le_keys(rkey, &MIN_KEY)) { set_cpu_key_k_offset(&pos_key, next_pos); continue; } if (COMP_SHORT_KEYS(rkey, &pos_key)) { goto end; } set_cpu_key_k_offset(&pos_key, le_key_k_offset(KEY_FORMAT_3_5, rkey)); } end: *pos = next_pos; pathrelse(&path_to_entry); reiserfs_check_path(&path_to_entry); out: reiserfs_write_unlock(inode->i_sb); return ret; }
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 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; reiserfs_check_lock_depth("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 ("reiserfs_readdir 1: f_pos = %Ld\n", filp->f_pos);*/ 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 return -EIO; } 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_LEN(inode->i_sb->s_blocksize)){ /* too big to send back to VFS */ 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); return -ENOMEM ; } 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: // FIXME: ext2_readdir does not reset f_pos filp->f_pos = next_pos; pathrelse (&path_to_entry); reiserfs_check_path(&path_to_entry) ; UPDATE_ATIME(inode) ; return 0; }
int reiserfs_readdir_dentry(struct dentry *dentry, void *dirent, filldir_t filldir, loff_t *pos) { struct inode *inode = 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, *pos ?: DOT_OFFSET, TYPE_DIRENTRY, 3); next_pos = cpu_key_k_offset(&pos_key); 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; loff_t cur_pos = deh_offset(deh); 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 (is_privroot_deh(dentry, deh)) continue; d_off = deh_offset(deh); *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); /* * Since filldir might sleep, we can release * the write lock here for other waiters */ reiserfs_write_unlock(inode->i_sb); if (filldir (dirent, local_buf, d_reclen, d_off, d_ino, DT_UNKNOWN) < 0) { reiserfs_write_lock(inode->i_sb); if (local_buf != small_buf) { kfree(local_buf); } goto end; } reiserfs_write_lock(inode->i_sb); if (local_buf != small_buf) { kfree(local_buf); } /* deh_offset(deh) may be invalid now. */ next_pos = cur_pos + 1; if (item_moved(&tmp_ih, &path_to_entry)) { set_cpu_key_k_offset(&pos_key, next_pos); 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: *pos = next_pos; pathrelse(&path_to_entry); reiserfs_check_path(&path_to_entry); out: reiserfs_write_unlock(inode->i_sb); return ret; }