static struct inode *ext2_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation) { struct inode *inode; if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) return ERR_PTR(-ESTALE); if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) return ERR_PTR(-ESTALE); /* iget isn't really right if the inode is currently unallocated!! * ext2_read_inode currently does appropriate checks, but * it might be "neater" to call ext2_get_inode first and check * if the inode is valid..... */ inode = ext2_iget(sb, ino); if (IS_ERR(inode)) return ERR_CAST(inode); if (generation && inode->i_generation != generation) { /* we didn't find the right inode.. */ iput(inode); return ERR_PTR(-ESTALE); } return inode; }
static struct inode *ext2_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation) { struct inode *inode; if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) return ERR_PTR(-ESTALE); if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) return ERR_PTR(-ESTALE); /* * ext2_iget isn't quite right if the inode is currently unallocated! * However ext2_iget currently does appropriate checks to handle stale * inodes so everything is OK. */ inode = ext2_iget(sb, ino); if (IS_ERR(inode)) return ERR_CAST(inode); if (generation && inode->i_generation != generation) { /* we didn't find the right inode.. */ iput(inode); return ERR_PTR(-ESTALE); } return inode; }
static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd) { struct inode * inode; ino_t ino; if (dentry->d_name.len > EXT2_NAME_LEN) return ERR_PTR(-ENAMETOOLONG); ino = ext2_inode_by_name(dir, &dentry->d_name); inode = NULL; if (ino) { inode = ext2_iget(dir->i_sb, ino); <<<<<<< HEAD if (IS_ERR(inode)) { ======= if (unlikely(IS_ERR(inode))) { >>>>>>> 296c66da8a02d52243f45b80521febece5ed498a if (PTR_ERR(inode) == -ESTALE) { ext2_error(dir->i_sb, __func__, "deleted inode referenced: %lu", (unsigned long) ino); return ERR_PTR(-EIO); } else { return ERR_CAST(inode); } }
static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd) { struct inode * inode; ino_t ino; if (dentry->d_name.len > EXT2_NAME_LEN) return ERR_PTR(-ENAMETOOLONG); ino = ext2_inode_by_name(dir, &dentry->d_name); inode = NULL; if (ino) { inode = ext2_iget(dir->i_sb, ino); if (unlikely(IS_ERR(inode))) { if (PTR_ERR(inode) == -ESTALE) { ext2_error(dir->i_sb, __func__, "deleted inode referenced: %lu", (unsigned long) ino); return ERR_PTR(-EIO); } else { return ERR_CAST(inode); } } } return d_splice_alias(inode, dentry); }
struct dentry *ext2_get_parent(struct dentry *child) { struct qstr dotdot = QSTR_INIT("..", 2); unsigned long ino = ext2_inode_by_name(child->d_inode, &dotdot); if (!ino) return ERR_PTR(-ENOENT); return d_obtain_alias(ext2_iget(child->d_inode->i_sb, ino)); }
// Vijay: Modified lookup for ext2bp. This includes a validation check inside it. static struct dentry *ext2bp_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd) { ext2bp_debug("Inside ext2bp_lookup for dir with inode num: %lu\n", dir->i_ino); struct inode * inode; ino_t ino; if (dentry->d_name.len > EXT2_NAME_LEN) return ERR_PTR(-ENAMETOOLONG); ino = ext2_inode_by_name(dir, dentry); inode = NULL; if (ino) { inode = ext2_iget(dir->i_sb, ino); if (IS_ERR(inode)) return ERR_CAST(inode); // Check the inode state if (inode->i_state & I_DIRTY) ext2bp_debug("Inode's state: dirty\n"); if (inode->i_state & I_NEW) ext2bp_debug("Inode's state: new\n"); if (inode->i_state & I_LOCK) ext2bp_debug("Inode's state: locked\n"); if (inode->i_state & I_CLEAR) ext2bp_debug("Inode's state: clear\n"); if (inode->i_state & I_SYNC) ext2bp_debug("Inode's state: sync\n"); ext2bp_debug("Inode's state: something I didnt check for\n"); // Now that we have the child inode, we can // carry out the check. struct ext2_inode_info *ei = EXT2_I(inode); int n; int backlink_present = 0; for (n=0; n < EXT2_N_LINKS; n++) if (ei->i_backlinks[n] == dir->i_ino) { backlink_present = 1; ext2bp_debug("Found backlink from %lu to %lu\n", inode->i_ino, dir->i_ino); break; } if (!backlink_present) { printk("Vijay:Error:Did not find backlink from %lu to %lu\n", inode->i_ino, dir->i_ino); iput(inode); return ERR_PTR(-EIO); } } return d_splice_alias(inode, dentry); }
static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd) { struct inode * inode; ino_t ino; if (dentry->d_name.len > EXT2_NAME_LEN) return ERR_PTR(-ENAMETOOLONG); ino = ext2_inode_by_name(dir, dentry); inode = NULL; if (ino) { inode = ext2_iget(dir->i_sb, ino); if (IS_ERR(inode)) return ERR_CAST(inode); } return d_splice_alias(inode, dentry); }
static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags) { struct inode * inode; ino_t ino; if (dentry->d_name.len > EXT2_NAME_LEN) return ERR_PTR(-ENAMETOOLONG); ino = ext2_inode_by_name(dir, &dentry->d_name); inode = NULL; if (ino) { inode = ext2_iget(dir->i_sb, ino); if (inode == ERR_PTR(-ESTALE)) { ext2_error(dir->i_sb, __func__, "deleted inode referenced: %lu", (unsigned long) ino); return ERR_PTR(-EIO); } } return d_splice_alias(inode, dentry); }
struct dentry *ext2_get_parent(struct dentry *child) { unsigned long ino; struct dentry *parent; struct inode *inode; struct dentry dotdot; dotdot.d_name.name = ".."; dotdot.d_name.len = 2; ino = ext2_inode_by_name(child->d_inode, &dotdot); if (!ino) return ERR_PTR(-ENOENT); inode = ext2_iget(child->d_inode->i_sb, ino); if (IS_ERR(inode)) return ERR_CAST(inode); parent = d_alloc_anon(inode); if (!parent) { iput(inode); parent = ERR_PTR(-ENOMEM); } return parent; }
static int ext2_fill_super(struct super_block *sb, void *data, int silent) { struct buffer_head * bh; struct ext2_sb_info * sbi; struct ext2_super_block * es; struct inode *root; unsigned long block; unsigned long sb_block = get_sb_block(&data); unsigned long logic_sb_block; unsigned long offset = 0; unsigned long def_mount_opts; long ret = -EINVAL; int blocksize = BLOCK_SIZE; int db_count; int i, j; __le32 features; int err; sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); if (!sbi) return -ENOMEM; sbi->s_blockgroup_lock = kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); if (!sbi->s_blockgroup_lock) { kfree(sbi); return -ENOMEM; } sb->s_fs_info = sbi; sbi->s_sb_block = sb_block; /* * See what the current blocksize for the device is, and * use that as the blocksize. Otherwise (or if the blocksize * is smaller than the default) use the default. * This is important for devices that have a hardware * sectorsize that is larger than the default. */ blocksize = sb_min_blocksize(sb, BLOCK_SIZE); if (!blocksize) { printk ("EXT2-fs: unable to set blocksize\n"); goto failed_sbi; } /* * If the superblock doesn't start on a hardware sector boundary, * calculate the offset. */ if (blocksize != BLOCK_SIZE) { logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; offset = (sb_block*BLOCK_SIZE) % blocksize; } else { logic_sb_block = sb_block; } if (!(bh = sb_bread(sb, logic_sb_block))) { printk ("EXT2-fs: unable to read superblock\n"); goto failed_sbi; } /* * Note: s_es must be initialized as soon as possible because * some ext2 macro-instructions depend on its value */ es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); sbi->s_es = es; sb->s_magic = le16_to_cpu(es->s_magic); if (sb->s_magic != EXT2_SUPER_MAGIC) goto cantfind_ext2; /* Set defaults before we parse the mount options */ def_mount_opts = le32_to_cpu(es->s_default_mount_opts); if (def_mount_opts & EXT2_DEFM_DEBUG) set_opt(sbi->s_mount_opt, DEBUG); if (def_mount_opts & EXT2_DEFM_BSDGROUPS) set_opt(sbi->s_mount_opt, GRPID); if (def_mount_opts & EXT2_DEFM_UID16) set_opt(sbi->s_mount_opt, NO_UID32); #ifdef CONFIG_EXT2_FS_XATTR if (def_mount_opts & EXT2_DEFM_XATTR_USER) set_opt(sbi->s_mount_opt, XATTR_USER); #endif #ifdef CONFIG_EXT2_FS_POSIX_ACL if (def_mount_opts & EXT2_DEFM_ACL) set_opt(sbi->s_mount_opt, POSIX_ACL); #endif if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) set_opt(sbi->s_mount_opt, ERRORS_PANIC); else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) set_opt(sbi->s_mount_opt, ERRORS_CONT); else set_opt(sbi->s_mount_opt, ERRORS_RO); sbi->s_resuid = le16_to_cpu(es->s_def_resuid); sbi->s_resgid = le16_to_cpu(es->s_def_resgid); set_opt(sbi->s_mount_opt, RESERVATION); if (!parse_options ((char *) data, sbi)) goto failed_mount; sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset EXT2_MOUNT_XIP if not */ if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) printk("EXT2-fs warning: feature flags set on rev 0 fs, " "running e2fsck is recommended\n"); /* * Check feature flags regardless of the revision level, since we * previously didn't change the revision level when setting the flags, * so there is a chance incompat flags are set on a rev 0 filesystem. */ features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); if (features) { printk("EXT2-fs: %s: couldn't mount because of " "unsupported optional features (%x).\n", sb->s_id, le32_to_cpu(features)); goto failed_mount; } if (!(sb->s_flags & MS_RDONLY) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ printk("EXT2-fs: %s: couldn't mount RDWR because of " "unsupported optional features (%x).\n", sb->s_id, le32_to_cpu(features)); goto failed_mount; } blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); if (ext2_use_xip(sb) && blocksize != PAGE_SIZE) { if (!silent) printk("XIP: Unsupported blocksize\n"); goto failed_mount; } /* If the blocksize doesn't match, re-read the thing.. */ if (sb->s_blocksize != blocksize) { brelse(bh); if (!sb_set_blocksize(sb, blocksize)) { printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n"); goto failed_sbi; } logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; offset = (sb_block*BLOCK_SIZE) % blocksize; bh = sb_bread(sb, logic_sb_block); if(!bh) { printk("EXT2-fs: Couldn't read superblock on " "2nd try.\n"); goto failed_sbi; } es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); sbi->s_es = es; if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { printk ("EXT2-fs: Magic mismatch, very weird !\n"); goto failed_mount; } } sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; } else { sbi->s_inode_size = le16_to_cpu(es->s_inode_size); sbi->s_first_ino = le32_to_cpu(es->s_first_ino); if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || !is_power_of_2(sbi->s_inode_size) || (sbi->s_inode_size > blocksize)) { printk ("EXT2-fs: unsupported inode size: %d\n", sbi->s_inode_size); goto failed_mount; } } sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << le32_to_cpu(es->s_log_frag_size); if (sbi->s_frag_size == 0) goto cantfind_ext2; sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); if (EXT2_INODE_SIZE(sb) == 0) goto cantfind_ext2; sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) goto cantfind_ext2; sbi->s_itb_per_group = sbi->s_inodes_per_group / sbi->s_inodes_per_block; sbi->s_desc_per_block = sb->s_blocksize / sizeof (struct ext2_group_desc); sbi->s_sbh = bh; sbi->s_mount_state = le16_to_cpu(es->s_state); sbi->s_addr_per_block_bits = ilog2 (EXT2_ADDR_PER_BLOCK(sb)); sbi->s_desc_per_block_bits = ilog2 (EXT2_DESC_PER_BLOCK(sb)); if (sb->s_magic != EXT2_SUPER_MAGIC) goto cantfind_ext2; if (sb->s_blocksize != bh->b_size) { if (!silent) printk ("VFS: Unsupported blocksize on dev " "%s.\n", sb->s_id); goto failed_mount; } if (sb->s_blocksize != sbi->s_frag_size) { printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n", sbi->s_frag_size, sb->s_blocksize); goto failed_mount; } if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { printk ("EXT2-fs: #blocks per group too big: %lu\n", sbi->s_blocks_per_group); goto failed_mount; } if (sbi->s_frags_per_group > sb->s_blocksize * 8) { printk ("EXT2-fs: #fragments per group too big: %lu\n", sbi->s_frags_per_group); goto failed_mount; } if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { printk ("EXT2-fs: #inodes per group too big: %lu\n", sbi->s_inodes_per_group); goto failed_mount; } if (EXT2_BLOCKS_PER_GROUP(sb) == 0) goto cantfind_ext2; sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - le32_to_cpu(es->s_first_data_block) - 1) / EXT2_BLOCKS_PER_GROUP(sb)) + 1; db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / EXT2_DESC_PER_BLOCK(sb); sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); if (sbi->s_group_desc == NULL) { printk ("EXT2-fs: not enough memory\n"); goto failed_mount; } bgl_lock_init(sbi->s_blockgroup_lock); sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); if (!sbi->s_debts) { printk ("EXT2-fs: not enough memory\n"); goto failed_mount_group_desc; } for (i = 0; i < db_count; i++) { block = descriptor_loc(sb, logic_sb_block, i); sbi->s_group_desc[i] = sb_bread(sb, block); if (!sbi->s_group_desc[i]) { for (j = 0; j < i; j++) brelse (sbi->s_group_desc[j]); printk ("EXT2-fs: unable to read group descriptors\n"); goto failed_mount_group_desc; } } if (!ext2_check_descriptors (sb)) { printk ("EXT2-fs: group descriptors corrupted!\n"); goto failed_mount2; } sbi->s_gdb_count = db_count; get_random_bytes(&sbi->s_next_generation, sizeof(u32)); spin_lock_init(&sbi->s_next_gen_lock); /* per fileystem reservation list head & lock */ spin_lock_init(&sbi->s_rsv_window_lock); sbi->s_rsv_window_root = RB_ROOT; /* * Add a single, static dummy reservation to the start of the * reservation window list --- it gives us a placeholder for * append-at-start-of-list which makes the allocation logic * _much_ simpler. */ sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; sbi->s_rsv_window_head.rsv_alloc_hit = 0; sbi->s_rsv_window_head.rsv_goal_size = 0; ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); err = percpu_counter_init(&sbi->s_freeblocks_counter, ext2_count_free_blocks(sb)); if (!err) { err = percpu_counter_init(&sbi->s_freeinodes_counter, ext2_count_free_inodes(sb)); } if (!err) { err = percpu_counter_init(&sbi->s_dirs_counter, ext2_count_dirs(sb)); } if (err) { printk(KERN_ERR "EXT2-fs: insufficient memory\n"); goto failed_mount3; } /* * set up enough so that it can read an inode */ sb->s_op = &ext2_sops; sb->s_export_op = &ext2_export_ops; sb->s_xattr = ext2_xattr_handlers; root = ext2_iget(sb, EXT2_ROOT_INO); if (IS_ERR(root)) { ret = PTR_ERR(root); goto failed_mount3; } if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { iput(root); printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n"); goto failed_mount3; } sb->s_root = d_alloc_root(root); if (!sb->s_root) { iput(root); printk(KERN_ERR "EXT2-fs: get root inode failed\n"); ret = -ENOMEM; goto failed_mount3; } if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) ext2_warning(sb, __func__, "mounting ext3 filesystem as ext2"); ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY); return 0; cantfind_ext2: if (!silent) printk("VFS: Can't find an ext2 filesystem on dev %s.\n", sb->s_id); goto failed_mount; failed_mount3: percpu_counter_destroy(&sbi->s_freeblocks_counter); percpu_counter_destroy(&sbi->s_freeinodes_counter); percpu_counter_destroy(&sbi->s_dirs_counter); failed_mount2: for (i = 0; i < db_count; i++) brelse(sbi->s_group_desc[i]); failed_mount_group_desc: kfree(sbi->s_group_desc); kfree(sbi->s_debts); failed_mount: brelse(bh); failed_sbi: sb->s_fs_info = NULL; kfree(sbi->s_blockgroup_lock); kfree(sbi); return ret; }
struct dentry *ext2_get_parent(struct dentry *child) { struct qstr dotdot = {.name = "..", .len = 2}; unsigned long ino = ext2_inode_by_name(child->d_inode, &dotdot); if (!ino) return ERR_PTR(-ENOENT); return d_obtain_alias(ext2_iget(child->d_inode->i_sb, ino)); } /* * By the time this is called, we already have created * the directory cache entry for the new file, but it * is so far negative - it has no inode. * * If the create succeeds, we fill in the inode information * with d_instantiate(). */ static int ext2_create (struct inode * dir, struct dentry * dentry, int mode, struct nameidata *nd) { struct inode *inode; dquot_initialize(dir); inode = ext2_new_inode(dir, mode); if (IS_ERR(inode)) return PTR_ERR(inode); inode->i_op = &ext2_file_inode_operations; if (ext2_use_xip(inode->i_sb)) { inode->i_mapping->a_ops = &ext2_aops_xip; inode->i_fop = &ext2_xip_file_operations; } else if (test_opt(inode->i_sb, NOBH)) { inode->i_mapping->a_ops = &ext2_nobh_aops; inode->i_fop = &ext2_file_operations; } else { inode->i_mapping->a_ops = &ext2_aops; inode->i_fop = &ext2_file_operations; } mark_inode_dirty(inode); return ext2_add_nondir(dentry, inode); } static int ext2_mknod (struct inode * dir, struct dentry *dentry, int mode, dev_t rdev) { struct inode * inode; int err; if (!new_valid_dev(rdev)) return -EINVAL; dquot_initialize(dir); inode = ext2_new_inode (dir, mode); err = PTR_ERR(inode); if (!IS_ERR(inode)) { init_special_inode(inode, inode->i_mode, rdev); #ifdef CONFIG_EXT2_FS_XATTR inode->i_op = &ext2_special_inode_operations; #endif mark_inode_dirty(inode); err = ext2_add_nondir(dentry, inode); } return err; } static int ext2_symlink (struct inode * dir, struct dentry * dentry, const char * symname) { struct super_block * sb = dir->i_sb; int err = -ENAMETOOLONG; unsigned l = strlen(symname)+1; struct inode * inode; if (l > sb->s_blocksize) goto out; dquot_initialize(dir); inode = ext2_new_inode (dir, S_IFLNK | S_IRWXUGO); err = PTR_ERR(inode); if (IS_ERR(inode)) goto out; if (l > sizeof (EXT2_I(inode)->i_data)) { /* slow symlink */ inode->i_op = &ext2_symlink_inode_operations; if (test_opt(inode->i_sb, NOBH)) inode->i_mapping->a_ops = &ext2_nobh_aops; else inode->i_mapping->a_ops = &ext2_aops; err = page_symlink(inode, symname, l); if (err) goto out_fail; } else { /* fast symlink */ inode->i_op = &ext2_fast_symlink_inode_operations; memcpy((char*)(EXT2_I(inode)->i_data),symname,l); inode->i_size = l-1; } mark_inode_dirty(inode); err = ext2_add_nondir(dentry, inode); out: return err; out_fail: inode_dec_link_count(inode); unlock_new_inode(inode); iput (inode); goto out; } static int ext2_link (struct dentry * old_dentry, struct inode * dir, struct dentry *dentry) { struct inode *inode = old_dentry->d_inode; int err; if (inode->i_nlink >= EXT2_LINK_MAX) return -EMLINK; dquot_initialize(dir); inode->i_ctime = CURRENT_TIME_SEC; inode_inc_link_count(inode); ihold(inode); err = ext2_add_link(dentry, inode); if (!err) { d_instantiate(dentry, inode); return 0; } inode_dec_link_count(inode); iput(inode); return err; } static int ext2_mkdir(struct inode * dir, struct dentry * dentry, int mode) { struct inode * inode; int err = -EMLINK; if (dir->i_nlink >= EXT2_LINK_MAX) goto out; dquot_initialize(dir); inode_inc_link_count(dir); inode = ext2_new_inode (dir, S_IFDIR | mode); err = PTR_ERR(inode); if (IS_ERR(inode)) goto out_dir; inode->i_op = &ext2_dir_inode_operations; inode->i_fop = &ext2_dir_operations; if (test_opt(inode->i_sb, NOBH)) inode->i_mapping->a_ops = &ext2_nobh_aops; else inode->i_mapping->a_ops = &ext2_aops; inode_inc_link_count(inode); err = ext2_make_empty(inode, dir); if (err) goto out_fail; err = ext2_add_link(dentry, inode); if (err) goto out_fail; d_instantiate(dentry, inode); unlock_new_inode(inode); out: return err; out_fail: inode_dec_link_count(inode); inode_dec_link_count(inode); unlock_new_inode(inode); iput(inode); out_dir: inode_dec_link_count(dir); goto out; } static int ext2_unlink(struct inode * dir, struct dentry *dentry) { struct inode * inode = dentry->d_inode; struct ext2_dir_entry_2 * de; struct page * page; int err = -ENOENT; dquot_initialize(dir); de = ext2_find_entry (dir, &dentry->d_name, &page); if (!de) goto out; err = ext2_delete_entry (de, page); if (err) goto out; inode->i_ctime = dir->i_ctime; inode_dec_link_count(inode); err = 0; out: return err; } static int ext2_rmdir (struct inode * dir, struct dentry *dentry) { struct inode * inode = dentry->d_inode; int err = -ENOTEMPTY; if (ext2_empty_dir(inode)) { err = ext2_unlink(dir, dentry); if (!err) { inode->i_size = 0; inode_dec_link_count(inode); inode_dec_link_count(dir); } } return err; } static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry, struct inode * new_dir, struct dentry * new_dentry ) { struct inode * old_inode = old_dentry->d_inode; struct inode * new_inode = new_dentry->d_inode; struct page * dir_page = NULL; struct ext2_dir_entry_2 * dir_de = NULL; struct page * old_page; struct ext2_dir_entry_2 * old_de; int err = -ENOENT; dquot_initialize(old_dir); dquot_initialize(new_dir); old_de = ext2_find_entry (old_dir, &old_dentry->d_name, &old_page); if (!old_de) goto out; if (S_ISDIR(old_inode->i_mode)) { err = -EIO; dir_de = ext2_dotdot(old_inode, &dir_page); if (!dir_de) goto out_old; } if (new_inode) { struct page *new_page; struct ext2_dir_entry_2 *new_de; err = -ENOTEMPTY; if (dir_de && !ext2_empty_dir (new_inode)) goto out_dir; err = -ENOENT; new_de = ext2_find_entry (new_dir, &new_dentry->d_name, &new_page); if (!new_de) goto out_dir; ext2_set_link(new_dir, new_de, new_page, old_inode, 1); new_inode->i_ctime = CURRENT_TIME_SEC; if (dir_de) drop_nlink(new_inode); inode_dec_link_count(new_inode); } else { if (dir_de) { err = -EMLINK; if (new_dir->i_nlink >= EXT2_LINK_MAX) goto out_dir; } err = ext2_add_link(new_dentry, old_inode); if (err) goto out_dir; if (dir_de) inode_inc_link_count(new_dir); } /* * Like most other Unix systems, set the ctime for inodes on a * rename. */ old_inode->i_ctime = CURRENT_TIME_SEC; mark_inode_dirty(old_inode); ext2_delete_entry (old_de, old_page); if (dir_de) { if (old_dir != new_dir) ext2_set_link(old_inode, dir_de, dir_page, new_dir, 0); else { kunmap(dir_page); page_cache_release(dir_page); } inode_dec_link_count(old_dir); } return 0; out_dir: if (dir_de) { kunmap(dir_page); page_cache_release(dir_page); } out_old: kunmap(old_page); page_cache_release(old_page); out: return err; } const struct inode_operations ext2_dir_inode_operations = { .create = ext2_create, .lookup = ext2_lookup, .link = ext2_link, .unlink = ext2_unlink, .symlink = ext2_symlink, .mkdir = ext2_mkdir, .rmdir = ext2_rmdir, .mknod = ext2_mknod, .rename = ext2_rename, #ifdef CONFIG_EXT2_FS_XATTR .setxattr = generic_setxattr, .getxattr = generic_getxattr, .listxattr = ext2_listxattr, .removexattr = generic_removexattr, #endif .setattr = ext2_setattr, .check_acl = ext2_check_acl, }; const struct inode_operations ext2_special_inode_operations = { #ifdef CONFIG_EXT2_FS_XATTR .setxattr = generic_setxattr, .getxattr = generic_getxattr, .listxattr = ext2_listxattr, .removexattr = generic_removexattr, #endif .setattr = ext2_setattr, .check_acl = ext2_check_acl, };
static struct ext2_inode *ext2_namei(const char *name) { char namebuf[256]; char *component; struct ext2_inode *dir_inode; struct ext2_dir_entry_2 *dp; int next_ino; /* squirrel away a copy of "namebuf" that we can modify: */ strcpy(namebuf, name); /* start at the root: */ if (!root_inode) root_inode = ext2_iget(EXT2_ROOT_INO); dir_inode = root_inode; if (!dir_inode) return NULL; component = strtok(namebuf, "/"); while (component) { int component_length; int rewind = 0; /* * Search for the specified component in the current * directory inode. */ next_ino = -1; component_length = strlen(component); /* rewind the first time through */ while ((dp = ext2_readdiri(dir_inode, !rewind++))) { if ((dp->name_len == component_length) && (strncmp(component, dp->name, component_length) == 0)) { /* Found it! */ #ifdef DEBUG_EXT2 printf("ext2_namei: found entry %s\n", component); #endif next_ino = dp->inode; break; } #ifdef DEBUG_EXT2 printf("ext2_namei: looping\n"); #endif } #ifdef DEBUG_EXT2 printf("ext2_namei: next_ino = %d\n", next_ino); #endif /* * At this point, we're done with this directory whether * we've succeeded or failed... */ if (dir_inode != root_inode) ext2_iput(dir_inode); /* * If next_ino is negative, then we've failed (gone * all the way through without finding anything) */ if (next_ino < 0) { return NULL; } /* * Otherwise, we can get this inode and find the next * component string... */ dir_inode = ext2_iget(next_ino); if (!dir_inode) return NULL; component = strtok(NULL, "/"); } /* * If we get here, then we got through all the components. * Whatever we got must match up with the last one. */ return dir_inode; }
static int ext2_fill_super(struct super_block *sb, void *data, int silent) { struct buffer_head * bh; struct ext2_sb_info * sbi; struct ext2_super_block * es; struct inode *root; unsigned long block; unsigned long sb_block = get_sb_block(&data); unsigned long logic_sb_block; unsigned long offset = 0; unsigned long def_mount_opts; long ret = -EINVAL; int blocksize = BLOCK_SIZE; int db_count; int i, j; __le32 features; int err; err = -ENOMEM; sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); if (!sbi) goto failed; sbi->s_blockgroup_lock = kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); if (!sbi->s_blockgroup_lock) { kfree(sbi); goto failed; } sb->s_fs_info = sbi; sbi->s_sb_block = sb_block; spin_lock_init(&sbi->s_lock); /* * See what the current blocksize for the device is, and * use that as the blocksize. Otherwise (or if the blocksize * is smaller than the default) use the default. * This is important for devices that have a hardware * sectorsize that is larger than the default. */ blocksize = sb_min_blocksize(sb, BLOCK_SIZE); if (!blocksize) { ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); goto failed_sbi; } /* * If the superblock doesn't start on a hardware sector boundary, * calculate the offset. */ if (blocksize != BLOCK_SIZE) { logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; offset = (sb_block*BLOCK_SIZE) % blocksize; } else { logic_sb_block = sb_block; } if (!(bh = sb_bread(sb, logic_sb_block))) { ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); goto failed_sbi; } /* * Note: s_es must be initialized as soon as possible because * some ext2 macro-instructions depend on its value */ es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); sbi->s_es = es; sb->s_magic = le16_to_cpu(es->s_magic); if (sb->s_magic != EXT2_SUPER_MAGIC) goto cantfind_ext2; /* Set defaults before we parse the mount options */ def_mount_opts = le32_to_cpu(es->s_default_mount_opts); if (def_mount_opts & EXT2_DEFM_DEBUG) set_opt(sbi->s_mount_opt, DEBUG); if (def_mount_opts & EXT2_DEFM_BSDGROUPS) set_opt(sbi->s_mount_opt, GRPID); if (def_mount_opts & EXT2_DEFM_UID16) set_opt(sbi->s_mount_opt, NO_UID32); #ifdef CONFIG_EXT2_FS_XATTR if (def_mount_opts & EXT2_DEFM_XATTR_USER) set_opt(sbi->s_mount_opt, XATTR_USER); #endif #ifdef CONFIG_EXT2_FS_POSIX_ACL if (def_mount_opts & EXT2_DEFM_ACL) set_opt(sbi->s_mount_opt, POSIX_ACL); #endif if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) set_opt(sbi->s_mount_opt, ERRORS_PANIC); else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) set_opt(sbi->s_mount_opt, ERRORS_CONT); else set_opt(sbi->s_mount_opt, ERRORS_RO); sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); set_opt(sbi->s_mount_opt, RESERVATION); if (!parse_options((char *) data, sb)) goto failed_mount; sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); sb->s_iflags |= SB_I_CGROUPWB; if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) ext2_msg(sb, KERN_WARNING, "warning: feature flags set on rev 0 fs, " "running e2fsck is recommended"); /* * Check feature flags regardless of the revision level, since we * previously didn't change the revision level when setting the flags, * so there is a chance incompat flags are set on a rev 0 filesystem. */ features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); if (features) { ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " "unsupported optional features (%x)", le32_to_cpu(features)); goto failed_mount; } if (!(sb->s_flags & MS_RDONLY) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " "unsupported optional features (%x)", le32_to_cpu(features)); goto failed_mount; } blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); if (sbi->s_mount_opt & EXT2_MOUNT_DAX) { struct blk_dax_ctl dax = { .sector = 0, .size = PAGE_SIZE, }; if (blocksize != PAGE_SIZE) { ext2_msg(sb, KERN_ERR, "error: unsupported blocksize for dax"); goto failed_mount; } err = bdev_direct_access(sb->s_bdev, &dax); if (err < 0) { switch (err) { case -EOPNOTSUPP: ext2_msg(sb, KERN_ERR, "error: device does not support dax"); break; case -EINVAL: ext2_msg(sb, KERN_ERR, "error: unaligned partition for dax"); break; default: ext2_msg(sb, KERN_ERR, "error: dax access failed (%d)", err); break; } goto failed_mount; } } /* If the blocksize doesn't match, re-read the thing.. */ if (sb->s_blocksize != blocksize) { brelse(bh); if (!sb_set_blocksize(sb, blocksize)) { ext2_msg(sb, KERN_ERR, "error: bad blocksize %d", blocksize); goto failed_sbi; } logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; offset = (sb_block*BLOCK_SIZE) % blocksize; bh = sb_bread(sb, logic_sb_block); if(!bh) { ext2_msg(sb, KERN_ERR, "error: couldn't read" "superblock on 2nd try"); goto failed_sbi; } es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); sbi->s_es = es; if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { ext2_msg(sb, KERN_ERR, "error: magic mismatch"); goto failed_mount; } } sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); sb->s_max_links = EXT2_LINK_MAX; if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; } else { sbi->s_inode_size = le16_to_cpu(es->s_inode_size); sbi->s_first_ino = le32_to_cpu(es->s_first_ino); if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || !is_power_of_2(sbi->s_inode_size) || (sbi->s_inode_size > blocksize)) { ext2_msg(sb, KERN_ERR, "error: unsupported inode size: %d", sbi->s_inode_size); goto failed_mount; } } sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << le32_to_cpu(es->s_log_frag_size); if (sbi->s_frag_size == 0) goto cantfind_ext2; sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); if (EXT2_INODE_SIZE(sb) == 0) goto cantfind_ext2; sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) goto cantfind_ext2; sbi->s_itb_per_group = sbi->s_inodes_per_group / sbi->s_inodes_per_block; sbi->s_desc_per_block = sb->s_blocksize / sizeof (struct ext2_group_desc); sbi->s_sbh = bh; sbi->s_mount_state = le16_to_cpu(es->s_state); sbi->s_addr_per_block_bits = ilog2 (EXT2_ADDR_PER_BLOCK(sb)); sbi->s_desc_per_block_bits = ilog2 (EXT2_DESC_PER_BLOCK(sb)); if (sb->s_magic != EXT2_SUPER_MAGIC) goto cantfind_ext2; if (sb->s_blocksize != bh->b_size) { if (!silent) ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); goto failed_mount; } if (sb->s_blocksize != sbi->s_frag_size) { ext2_msg(sb, KERN_ERR, "error: fragsize %lu != blocksize %lu" "(not supported yet)", sbi->s_frag_size, sb->s_blocksize); goto failed_mount; } if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { ext2_msg(sb, KERN_ERR, "error: #blocks per group too big: %lu", sbi->s_blocks_per_group); goto failed_mount; } if (sbi->s_frags_per_group > sb->s_blocksize * 8) { ext2_msg(sb, KERN_ERR, "error: #fragments per group too big: %lu", sbi->s_frags_per_group); goto failed_mount; } if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { ext2_msg(sb, KERN_ERR, "error: #inodes per group too big: %lu", sbi->s_inodes_per_group); goto failed_mount; } if (EXT2_BLOCKS_PER_GROUP(sb) == 0) goto cantfind_ext2; sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - le32_to_cpu(es->s_first_data_block) - 1) / EXT2_BLOCKS_PER_GROUP(sb)) + 1; db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / EXT2_DESC_PER_BLOCK(sb); sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); if (sbi->s_group_desc == NULL) { ext2_msg(sb, KERN_ERR, "error: not enough memory"); goto failed_mount; } bgl_lock_init(sbi->s_blockgroup_lock); sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); if (!sbi->s_debts) { ext2_msg(sb, KERN_ERR, "error: not enough memory"); goto failed_mount_group_desc; } for (i = 0; i < db_count; i++) { block = descriptor_loc(sb, logic_sb_block, i); sbi->s_group_desc[i] = sb_bread(sb, block); if (!sbi->s_group_desc[i]) { for (j = 0; j < i; j++) brelse (sbi->s_group_desc[j]); ext2_msg(sb, KERN_ERR, "error: unable to read group descriptors"); goto failed_mount_group_desc; } } if (!ext2_check_descriptors (sb)) { ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); goto failed_mount2; } sbi->s_gdb_count = db_count; get_random_bytes(&sbi->s_next_generation, sizeof(u32)); spin_lock_init(&sbi->s_next_gen_lock); /* per fileystem reservation list head & lock */ spin_lock_init(&sbi->s_rsv_window_lock); sbi->s_rsv_window_root = RB_ROOT; /* * Add a single, static dummy reservation to the start of the * reservation window list --- it gives us a placeholder for * append-at-start-of-list which makes the allocation logic * _much_ simpler. */ sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; sbi->s_rsv_window_head.rsv_alloc_hit = 0; sbi->s_rsv_window_head.rsv_goal_size = 0; ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); err = percpu_counter_init(&sbi->s_freeblocks_counter, ext2_count_free_blocks(sb), GFP_KERNEL); if (!err) { err = percpu_counter_init(&sbi->s_freeinodes_counter, ext2_count_free_inodes(sb), GFP_KERNEL); } if (!err) { err = percpu_counter_init(&sbi->s_dirs_counter, ext2_count_dirs(sb), GFP_KERNEL); } if (err) { ext2_msg(sb, KERN_ERR, "error: insufficient memory"); goto failed_mount3; } #ifdef CONFIG_EXT2_FS_XATTR sbi->s_mb_cache = ext2_xattr_create_cache(); if (!sbi->s_mb_cache) { ext2_msg(sb, KERN_ERR, "Failed to create an mb_cache"); goto failed_mount3; } #endif /* * set up enough so that it can read an inode */ sb->s_op = &ext2_sops; sb->s_export_op = &ext2_export_ops; sb->s_xattr = ext2_xattr_handlers; #ifdef CONFIG_QUOTA sb->dq_op = &dquot_operations; sb->s_qcop = &dquot_quotactl_ops; sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; #endif root = ext2_iget(sb, EXT2_ROOT_INO); if (IS_ERR(root)) { ret = PTR_ERR(root); goto failed_mount3; } if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { iput(root); ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); goto failed_mount3; } sb->s_root = d_make_root(root); if (!sb->s_root) { ext2_msg(sb, KERN_ERR, "error: get root inode failed"); ret = -ENOMEM; goto failed_mount3; } if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) ext2_msg(sb, KERN_WARNING, "warning: mounting ext3 filesystem as ext2"); if (ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY)) sb->s_flags |= MS_RDONLY; ext2_write_super(sb); return 0; cantfind_ext2: if (!silent) ext2_msg(sb, KERN_ERR, "error: can't find an ext2 filesystem on dev %s.", sb->s_id); goto failed_mount; failed_mount3: if (sbi->s_mb_cache) ext2_xattr_destroy_cache(sbi->s_mb_cache); percpu_counter_destroy(&sbi->s_freeblocks_counter); percpu_counter_destroy(&sbi->s_freeinodes_counter); percpu_counter_destroy(&sbi->s_dirs_counter); failed_mount2: for (i = 0; i < db_count; i++) brelse(sbi->s_group_desc[i]); failed_mount_group_desc: kfree(sbi->s_group_desc); kfree(sbi->s_debts); failed_mount: brelse(bh); failed_sbi: sb->s_fs_info = NULL; kfree(sbi->s_blockgroup_lock); kfree(sbi); failed: return ret; } static void ext2_clear_super_error(struct super_block *sb) { struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; if (buffer_write_io_error(sbh)) { /* * Oh, dear. A previous attempt to write the * superblock failed. This could happen because the * USB device was yanked out. Or it could happen to * be a transient write error and maybe the block will * be remapped. Nothing we can do but to retry the * write and hope for the best. */ ext2_msg(sb, KERN_ERR, "previous I/O error to superblock detected\n"); clear_buffer_write_io_error(sbh); set_buffer_uptodate(sbh); } } static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, int wait) { ext2_clear_super_error(sb); spin_lock(&EXT2_SB(sb)->s_lock); es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); es->s_wtime = cpu_to_le32(get_seconds()); /* unlock before we do IO */ spin_unlock(&EXT2_SB(sb)->s_lock); mark_buffer_dirty(EXT2_SB(sb)->s_sbh); if (wait) sync_dirty_buffer(EXT2_SB(sb)->s_sbh); }