From c290ea01abb7907fde602f3ba55905ef10a37477 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Thu, 18 Jun 2015 16:52:29 +0200 Subject: fs: Remove ext3 filesystem driver The functionality of ext3 is fully supported by ext4 driver. Major distributions (SUSE, RedHat) already use ext4 driver to handle ext3 filesystems for quite some time. There is some ugliness in mm resulting from jbd cleaning buffers in a dirty page without cleaning page dirty bit and also support for buffer bouncing in the block layer when stable pages are required is there only because of jbd. So let's remove the ext3 driver. This saves us some 28k lines of duplicated code. Acked-by: Theodore Ts'o Signed-off-by: Jan Kara --- fs/ext3/dir.c | 537 ---------------------------------------------------------- 1 file changed, 537 deletions(-) delete mode 100644 fs/ext3/dir.c (limited to 'fs/ext3/dir.c') diff --git a/fs/ext3/dir.c b/fs/ext3/dir.c deleted file mode 100644 index 17742eed2c16..000000000000 --- a/fs/ext3/dir.c +++ /dev/null @@ -1,537 +0,0 @@ -/* - * linux/fs/ext3/dir.c - * - * Copyright (C) 1992, 1993, 1994, 1995 - * Remy Card (card@masi.ibp.fr) - * Laboratoire MASI - Institut Blaise Pascal - * Universite Pierre et Marie Curie (Paris VI) - * - * from - * - * linux/fs/minix/dir.c - * - * Copyright (C) 1991, 1992 Linus Torvalds - * - * ext3 directory handling functions - * - * Big-endian to little-endian byte-swapping/bitmaps by - * David S. Miller (davem@caip.rutgers.edu), 1995 - * - * Hash Tree Directory indexing (c) 2001 Daniel Phillips - * - */ - -#include -#include "ext3.h" - -static unsigned char ext3_filetype_table[] = { - DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK -}; - -static int ext3_dx_readdir(struct file *, struct dir_context *); - -static unsigned char get_dtype(struct super_block *sb, int filetype) -{ - if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_FILETYPE) || - (filetype >= EXT3_FT_MAX)) - return DT_UNKNOWN; - - return (ext3_filetype_table[filetype]); -} - -/** - * Check if the given dir-inode refers to an htree-indexed directory - * (or a directory which could potentially get converted to use htree - * indexing). - * - * Return 1 if it is a dx dir, 0 if not - */ -static int is_dx_dir(struct inode *inode) -{ - struct super_block *sb = inode->i_sb; - - if (EXT3_HAS_COMPAT_FEATURE(inode->i_sb, - EXT3_FEATURE_COMPAT_DIR_INDEX) && - ((EXT3_I(inode)->i_flags & EXT3_INDEX_FL) || - ((inode->i_size >> sb->s_blocksize_bits) == 1))) - return 1; - - return 0; -} - -int ext3_check_dir_entry (const char * function, struct inode * dir, - struct ext3_dir_entry_2 * de, - struct buffer_head * bh, - unsigned long offset) -{ - const char * error_msg = NULL; - const int rlen = ext3_rec_len_from_disk(de->rec_len); - - if (unlikely(rlen < EXT3_DIR_REC_LEN(1))) - error_msg = "rec_len is smaller than minimal"; - else if (unlikely(rlen % 4 != 0)) - error_msg = "rec_len % 4 != 0"; - else if (unlikely(rlen < EXT3_DIR_REC_LEN(de->name_len))) - error_msg = "rec_len is too small for name_len"; - else if (unlikely((((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize))) - error_msg = "directory entry across blocks"; - else if (unlikely(le32_to_cpu(de->inode) > - le32_to_cpu(EXT3_SB(dir->i_sb)->s_es->s_inodes_count))) - error_msg = "inode out of bounds"; - - if (unlikely(error_msg != NULL)) - ext3_error (dir->i_sb, function, - "bad entry in directory #%lu: %s - " - "offset=%lu, inode=%lu, rec_len=%d, name_len=%d", - dir->i_ino, error_msg, offset, - (unsigned long) le32_to_cpu(de->inode), - rlen, de->name_len); - - return error_msg == NULL ? 1 : 0; -} - -static int ext3_readdir(struct file *file, struct dir_context *ctx) -{ - unsigned long offset; - int i; - struct ext3_dir_entry_2 *de; - int err; - struct inode *inode = file_inode(file); - struct super_block *sb = inode->i_sb; - int dir_has_error = 0; - - if (is_dx_dir(inode)) { - err = ext3_dx_readdir(file, ctx); - if (err != ERR_BAD_DX_DIR) - return err; - /* - * We don't set the inode dirty flag since it's not - * critical that it get flushed back to the disk. - */ - EXT3_I(inode)->i_flags &= ~EXT3_INDEX_FL; - } - offset = ctx->pos & (sb->s_blocksize - 1); - - while (ctx->pos < inode->i_size) { - unsigned long blk = ctx->pos >> EXT3_BLOCK_SIZE_BITS(sb); - struct buffer_head map_bh; - struct buffer_head *bh = NULL; - - map_bh.b_state = 0; - err = ext3_get_blocks_handle(NULL, inode, blk, 1, &map_bh, 0); - if (err > 0) { - pgoff_t index = map_bh.b_blocknr >> - (PAGE_CACHE_SHIFT - inode->i_blkbits); - if (!ra_has_index(&file->f_ra, index)) - page_cache_sync_readahead( - sb->s_bdev->bd_inode->i_mapping, - &file->f_ra, file, - index, 1); - file->f_ra.prev_pos = (loff_t)index << PAGE_CACHE_SHIFT; - bh = ext3_bread(NULL, inode, blk, 0, &err); - } - - /* - * We ignore I/O errors on directories so users have a chance - * of recovering data when there's a bad sector - */ - if (!bh) { - if (!dir_has_error) { - ext3_error(sb, __func__, "directory #%lu " - "contains a hole at offset %lld", - inode->i_ino, ctx->pos); - dir_has_error = 1; - } - /* corrupt size? Maybe no more blocks to read */ - if (ctx->pos > inode->i_blocks << 9) - break; - ctx->pos += sb->s_blocksize - offset; - continue; - } - - /* If the dir block has changed since the last call to - * readdir(2), then we might be pointing to an invalid - * dirent right now. Scan from the start of the block - * to make sure. */ - if (offset && file->f_version != inode->i_version) { - for (i = 0; i < sb->s_blocksize && i < offset; ) { - de = (struct ext3_dir_entry_2 *) - (bh->b_data + i); - /* It's too expensive to do a full - * dirent test each time round this - * loop, but we do have to test at - * least that it is non-zero. A - * failure will be detected in the - * dirent test below. */ - if (ext3_rec_len_from_disk(de->rec_len) < - EXT3_DIR_REC_LEN(1)) - break; - i += ext3_rec_len_from_disk(de->rec_len); - } - offset = i; - ctx->pos = (ctx->pos & ~(sb->s_blocksize - 1)) - | offset; - file->f_version = inode->i_version; - } - - while (ctx->pos < inode->i_size - && offset < sb->s_blocksize) { - de = (struct ext3_dir_entry_2 *) (bh->b_data + offset); - if (!ext3_check_dir_entry ("ext3_readdir", inode, de, - bh, offset)) { - /* On error, skip the to the - next block. */ - ctx->pos = (ctx->pos | - (sb->s_blocksize - 1)) + 1; - break; - } - offset += ext3_rec_len_from_disk(de->rec_len); - if (le32_to_cpu(de->inode)) { - if (!dir_emit(ctx, de->name, de->name_len, - le32_to_cpu(de->inode), - get_dtype(sb, de->file_type))) { - brelse(bh); - return 0; - } - } - ctx->pos += ext3_rec_len_from_disk(de->rec_len); - } - offset = 0; - brelse (bh); - if (ctx->pos < inode->i_size) - if (!dir_relax(inode)) - return 0; - } - return 0; -} - -static inline int is_32bit_api(void) -{ -#ifdef CONFIG_COMPAT - return is_compat_task(); -#else - return (BITS_PER_LONG == 32); -#endif -} - -/* - * These functions convert from the major/minor hash to an f_pos - * value for dx directories - * - * Upper layer (for example NFS) should specify FMODE_32BITHASH or - * FMODE_64BITHASH explicitly. On the other hand, we allow ext3 to be mounted - * directly on both 32-bit and 64-bit nodes, under such case, neither - * FMODE_32BITHASH nor FMODE_64BITHASH is specified. - */ -static inline loff_t hash2pos(struct file *filp, __u32 major, __u32 minor) -{ - if ((filp->f_mode & FMODE_32BITHASH) || - (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) - return major >> 1; - else - return ((__u64)(major >> 1) << 32) | (__u64)minor; -} - -static inline __u32 pos2maj_hash(struct file *filp, loff_t pos) -{ - if ((filp->f_mode & FMODE_32BITHASH) || - (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) - return (pos << 1) & 0xffffffff; - else - return ((pos >> 32) << 1) & 0xffffffff; -} - -static inline __u32 pos2min_hash(struct file *filp, loff_t pos) -{ - if ((filp->f_mode & FMODE_32BITHASH) || - (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) - return 0; - else - return pos & 0xffffffff; -} - -/* - * Return 32- or 64-bit end-of-file for dx directories - */ -static inline loff_t ext3_get_htree_eof(struct file *filp) -{ - if ((filp->f_mode & FMODE_32BITHASH) || - (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) - return EXT3_HTREE_EOF_32BIT; - else - return EXT3_HTREE_EOF_64BIT; -} - - -/* - * ext3_dir_llseek() calls generic_file_llseek[_size]() to handle both - * non-htree and htree directories, where the "offset" is in terms - * of the filename hash value instead of the byte offset. - * - * Because we may return a 64-bit hash that is well beyond s_maxbytes, - * we need to pass the max hash as the maximum allowable offset in - * the htree directory case. - * - * NOTE: offsets obtained *before* ext3_set_inode_flag(dir, EXT3_INODE_INDEX) - * will be invalid once the directory was converted into a dx directory - */ -static loff_t ext3_dir_llseek(struct file *file, loff_t offset, int whence) -{ - struct inode *inode = file->f_mapping->host; - int dx_dir = is_dx_dir(inode); - loff_t htree_max = ext3_get_htree_eof(file); - - if (likely(dx_dir)) - return generic_file_llseek_size(file, offset, whence, - htree_max, htree_max); - else - return generic_file_llseek(file, offset, whence); -} - -/* - * This structure holds the nodes of the red-black tree used to store - * the directory entry in hash order. - */ -struct fname { - __u32 hash; - __u32 minor_hash; - struct rb_node rb_hash; - struct fname *next; - __u32 inode; - __u8 name_len; - __u8 file_type; - char name[0]; -}; - -/* - * This functoin implements a non-recursive way of freeing all of the - * nodes in the red-black tree. - */ -static void free_rb_tree_fname(struct rb_root *root) -{ - struct fname *fname, *next; - - rbtree_postorder_for_each_entry_safe(fname, next, root, rb_hash) - do { - struct fname *old = fname; - fname = fname->next; - kfree(old); - } while (fname); - - *root = RB_ROOT; -} - -static struct dir_private_info *ext3_htree_create_dir_info(struct file *filp, - loff_t pos) -{ - struct dir_private_info *p; - - p = kzalloc(sizeof(struct dir_private_info), GFP_KERNEL); - if (!p) - return NULL; - p->curr_hash = pos2maj_hash(filp, pos); - p->curr_minor_hash = pos2min_hash(filp, pos); - return p; -} - -void ext3_htree_free_dir_info(struct dir_private_info *p) -{ - free_rb_tree_fname(&p->root); - kfree(p); -} - -/* - * Given a directory entry, enter it into the fname rb tree. - */ -int ext3_htree_store_dirent(struct file *dir_file, __u32 hash, - __u32 minor_hash, - struct ext3_dir_entry_2 *dirent) -{ - struct rb_node **p, *parent = NULL; - struct fname * fname, *new_fn; - struct dir_private_info *info; - int len; - - info = (struct dir_private_info *) dir_file->private_data; - p = &info->root.rb_node; - - /* Create and allocate the fname structure */ - len = sizeof(struct fname) + dirent->name_len + 1; - new_fn = kzalloc(len, GFP_KERNEL); - if (!new_fn) - return -ENOMEM; - new_fn->hash = hash; - new_fn->minor_hash = minor_hash; - new_fn->inode = le32_to_cpu(dirent->inode); - new_fn->name_len = dirent->name_len; - new_fn->file_type = dirent->file_type; - memcpy(new_fn->name, dirent->name, dirent->name_len); - new_fn->name[dirent->name_len] = 0; - - while (*p) { - parent = *p; - fname = rb_entry(parent, struct fname, rb_hash); - - /* - * If the hash and minor hash match up, then we put - * them on a linked list. This rarely happens... - */ - if ((new_fn->hash == fname->hash) && - (new_fn->minor_hash == fname->minor_hash)) { - new_fn->next = fname->next; - fname->next = new_fn; - return 0; - } - - if (new_fn->hash < fname->hash) - p = &(*p)->rb_left; - else if (new_fn->hash > fname->hash) - p = &(*p)->rb_right; - else if (new_fn->minor_hash < fname->minor_hash) - p = &(*p)->rb_left; - else /* if (new_fn->minor_hash > fname->minor_hash) */ - p = &(*p)->rb_right; - } - - rb_link_node(&new_fn->rb_hash, parent, p); - rb_insert_color(&new_fn->rb_hash, &info->root); - return 0; -} - - - -/* - * This is a helper function for ext3_dx_readdir. It calls filldir - * for all entres on the fname linked list. (Normally there is only - * one entry on the linked list, unless there are 62 bit hash collisions.) - */ -static bool call_filldir(struct file *file, struct dir_context *ctx, - struct fname *fname) -{ - struct dir_private_info *info = file->private_data; - struct inode *inode = file_inode(file); - struct super_block *sb = inode->i_sb; - - if (!fname) { - printk("call_filldir: called with null fname?!?\n"); - return true; - } - ctx->pos = hash2pos(file, fname->hash, fname->minor_hash); - while (fname) { - if (!dir_emit(ctx, fname->name, fname->name_len, - fname->inode, - get_dtype(sb, fname->file_type))) { - info->extra_fname = fname; - return false; - } - fname = fname->next; - } - return true; -} - -static int ext3_dx_readdir(struct file *file, struct dir_context *ctx) -{ - struct dir_private_info *info = file->private_data; - struct inode *inode = file_inode(file); - struct fname *fname; - int ret; - - if (!info) { - info = ext3_htree_create_dir_info(file, ctx->pos); - if (!info) - return -ENOMEM; - file->private_data = info; - } - - if (ctx->pos == ext3_get_htree_eof(file)) - return 0; /* EOF */ - - /* Some one has messed with f_pos; reset the world */ - if (info->last_pos != ctx->pos) { - free_rb_tree_fname(&info->root); - info->curr_node = NULL; - info->extra_fname = NULL; - info->curr_hash = pos2maj_hash(file, ctx->pos); - info->curr_minor_hash = pos2min_hash(file, ctx->pos); - } - - /* - * If there are any leftover names on the hash collision - * chain, return them first. - */ - if (info->extra_fname) { - if (!call_filldir(file, ctx, info->extra_fname)) - goto finished; - info->extra_fname = NULL; - goto next_node; - } else if (!info->curr_node) - info->curr_node = rb_first(&info->root); - - while (1) { - /* - * Fill the rbtree if we have no more entries, - * or the inode has changed since we last read in the - * cached entries. - */ - if ((!info->curr_node) || - (file->f_version != inode->i_version)) { - info->curr_node = NULL; - free_rb_tree_fname(&info->root); - file->f_version = inode->i_version; - ret = ext3_htree_fill_tree(file, info->curr_hash, - info->curr_minor_hash, - &info->next_hash); - if (ret < 0) - return ret; - if (ret == 0) { - ctx->pos = ext3_get_htree_eof(file); - break; - } - info->curr_node = rb_first(&info->root); - } - - fname = rb_entry(info->curr_node, struct fname, rb_hash); - info->curr_hash = fname->hash; - info->curr_minor_hash = fname->minor_hash; - if (!call_filldir(file, ctx, fname)) - break; - next_node: - info->curr_node = rb_next(info->curr_node); - if (info->curr_node) { - fname = rb_entry(info->curr_node, struct fname, - rb_hash); - info->curr_hash = fname->hash; - info->curr_minor_hash = fname->minor_hash; - } else { - if (info->next_hash == ~0) { - ctx->pos = ext3_get_htree_eof(file); - break; - } - info->curr_hash = info->next_hash; - info->curr_minor_hash = 0; - } - } -finished: - info->last_pos = ctx->pos; - return 0; -} - -static int ext3_release_dir (struct inode * inode, struct file * filp) -{ - if (filp->private_data) - ext3_htree_free_dir_info(filp->private_data); - - return 0; -} - -const struct file_operations ext3_dir_operations = { - .llseek = ext3_dir_llseek, - .read = generic_read_dir, - .iterate = ext3_readdir, - .unlocked_ioctl = ext3_ioctl, -#ifdef CONFIG_COMPAT - .compat_ioctl = ext3_compat_ioctl, -#endif - .fsync = ext3_sync_file, - .release = ext3_release_dir, -}; -- cgit 1.4.1