| /* |
| * linux/fs/ext4/super.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/inode.c |
| * |
| * Copyright (C) 1991, 1992 Linus Torvalds |
| * |
| * Big-endian to little-endian byte-swapping/bitmaps by |
| * David S. Miller (davem@caip.rutgers.edu), 1995 |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/string.h> |
| #include <linux/fs.h> |
| #include <linux/time.h> |
| #include <linux/vmalloc.h> |
| #include <linux/jbd2.h> |
| #include <linux/slab.h> |
| #include <linux/init.h> |
| #include <linux/blkdev.h> |
| #include <linux/parser.h> |
| #include <linux/buffer_head.h> |
| #include <linux/exportfs.h> |
| #include <linux/vfs.h> |
| #include <linux/random.h> |
| #include <linux/mount.h> |
| #include <linux/namei.h> |
| #include <linux/quotaops.h> |
| #include <linux/seq_file.h> |
| #include <linux/proc_fs.h> |
| #include <linux/ctype.h> |
| #include <linux/log2.h> |
| #include <linux/crc16.h> |
| #include <linux/cleancache.h> |
| #include <asm/uaccess.h> |
| |
| #include <linux/kthread.h> |
| #include <linux/freezer.h> |
| |
| #include "ext4.h" |
| #include "ext4_extents.h" |
| #include "ext4_jbd2.h" |
| #include "xattr.h" |
| #include "acl.h" |
| #include "mballoc.h" |
| |
| #define CREATE_TRACE_POINTS |
| #include <trace/events/ext4.h> |
| |
| static struct proc_dir_entry *ext4_proc_root; |
| static struct kset *ext4_kset; |
| static struct ext4_lazy_init *ext4_li_info; |
| static struct mutex ext4_li_mtx; |
| static struct ext4_features *ext4_feat; |
| |
| static int ext4_load_journal(struct super_block *, struct ext4_super_block *, |
| unsigned long journal_devnum); |
| static int ext4_commit_super(struct super_block *sb, int sync); |
| static void ext4_mark_recovery_complete(struct super_block *sb, |
| struct ext4_super_block *es); |
| static void ext4_clear_journal_err(struct super_block *sb, |
| struct ext4_super_block *es); |
| static int ext4_sync_fs(struct super_block *sb, int wait); |
| static const char *ext4_decode_error(struct super_block *sb, int errno, |
| char nbuf[16]); |
| static int ext4_remount(struct super_block *sb, int *flags, char *data); |
| static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); |
| static int ext4_unfreeze(struct super_block *sb); |
| static void ext4_write_super(struct super_block *sb); |
| static int ext4_freeze(struct super_block *sb); |
| static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, |
| const char *dev_name, void *data); |
| static inline int ext2_feature_set_ok(struct super_block *sb); |
| static inline int ext3_feature_set_ok(struct super_block *sb); |
| static int ext4_feature_set_ok(struct super_block *sb, int readonly); |
| static void ext4_destroy_lazyinit_thread(void); |
| static void ext4_unregister_li_request(struct super_block *sb); |
| static void ext4_clear_request_list(void); |
| |
| #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) |
| static struct file_system_type ext2_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "ext2", |
| .mount = ext4_mount, |
| .kill_sb = kill_block_super, |
| .fs_flags = FS_REQUIRES_DEV, |
| }; |
| #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type) |
| #else |
| #define IS_EXT2_SB(sb) (0) |
| #endif |
| |
| |
| #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) |
| static struct file_system_type ext3_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "ext3", |
| .mount = ext4_mount, |
| .kill_sb = kill_block_super, |
| .fs_flags = FS_REQUIRES_DEV, |
| }; |
| #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type) |
| #else |
| #define IS_EXT3_SB(sb) (0) |
| #endif |
| |
| void *ext4_kvmalloc(size_t size, gfp_t flags) |
| { |
| void *ret; |
| |
| ret = kmalloc(size, flags); |
| if (!ret) |
| ret = __vmalloc(size, flags, PAGE_KERNEL); |
| return ret; |
| } |
| |
| void *ext4_kvzalloc(size_t size, gfp_t flags) |
| { |
| void *ret; |
| |
| ret = kzalloc(size, flags); |
| if (!ret) |
| ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL); |
| return ret; |
| } |
| |
| void ext4_kvfree(void *ptr) |
| { |
| if (is_vmalloc_addr(ptr)) |
| vfree(ptr); |
| else |
| kfree(ptr); |
| |
| } |
| |
| ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, |
| struct ext4_group_desc *bg) |
| { |
| return le32_to_cpu(bg->bg_block_bitmap_lo) | |
| (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
| (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); |
| } |
| |
| ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, |
| struct ext4_group_desc *bg) |
| { |
| return le32_to_cpu(bg->bg_inode_bitmap_lo) | |
| (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
| (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); |
| } |
| |
| ext4_fsblk_t ext4_inode_table(struct super_block *sb, |
| struct ext4_group_desc *bg) |
| { |
| return le32_to_cpu(bg->bg_inode_table_lo) | |
| (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
| (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); |
| } |
| |
| __u32 ext4_free_group_clusters(struct super_block *sb, |
| struct ext4_group_desc *bg) |
| { |
| return le16_to_cpu(bg->bg_free_blocks_count_lo) | |
| (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
| (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0); |
| } |
| |
| __u32 ext4_free_inodes_count(struct super_block *sb, |
| struct ext4_group_desc *bg) |
| { |
| return le16_to_cpu(bg->bg_free_inodes_count_lo) | |
| (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
| (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0); |
| } |
| |
| __u32 ext4_used_dirs_count(struct super_block *sb, |
| struct ext4_group_desc *bg) |
| { |
| return le16_to_cpu(bg->bg_used_dirs_count_lo) | |
| (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
| (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0); |
| } |
| |
| __u32 ext4_itable_unused_count(struct super_block *sb, |
| struct ext4_group_desc *bg) |
| { |
| return le16_to_cpu(bg->bg_itable_unused_lo) | |
| (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
| (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0); |
| } |
| |
| void ext4_block_bitmap_set(struct super_block *sb, |
| struct ext4_group_desc *bg, ext4_fsblk_t blk) |
| { |
| bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); |
| if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
| bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); |
| } |
| |
| void ext4_inode_bitmap_set(struct super_block *sb, |
| struct ext4_group_desc *bg, ext4_fsblk_t blk) |
| { |
| bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); |
| if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
| bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); |
| } |
| |
| void ext4_inode_table_set(struct super_block *sb, |
| struct ext4_group_desc *bg, ext4_fsblk_t blk) |
| { |
| bg->bg_inode_table_lo = cpu_to_le32((u32)blk); |
| if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
| bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); |
| } |
| |
| void ext4_free_group_clusters_set(struct super_block *sb, |
| struct ext4_group_desc *bg, __u32 count) |
| { |
| bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count); |
| if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
| bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16); |
| } |
| |
| void ext4_free_inodes_set(struct super_block *sb, |
| struct ext4_group_desc *bg, __u32 count) |
| { |
| bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count); |
| if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
| bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16); |
| } |
| |
| void ext4_used_dirs_set(struct super_block *sb, |
| struct ext4_group_desc *bg, __u32 count) |
| { |
| bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count); |
| if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
| bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16); |
| } |
| |
| void ext4_itable_unused_set(struct super_block *sb, |
| struct ext4_group_desc *bg, __u32 count) |
| { |
| bg->bg_itable_unused_lo = cpu_to_le16((__u16)count); |
| if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
| bg->bg_itable_unused_hi = cpu_to_le16(count >> 16); |
| } |
| |
| |
| /* Just increment the non-pointer handle value */ |
| static handle_t *ext4_get_nojournal(void) |
| { |
| handle_t *handle = current->journal_info; |
| unsigned long ref_cnt = (unsigned long)handle; |
| |
| BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT); |
| |
| ref_cnt++; |
| handle = (handle_t *)ref_cnt; |
| |
| current->journal_info = handle; |
| return handle; |
| } |
| |
| |
| /* Decrement the non-pointer handle value */ |
| static void ext4_put_nojournal(handle_t *handle) |
| { |
| unsigned long ref_cnt = (unsigned long)handle; |
| |
| BUG_ON(ref_cnt == 0); |
| |
| ref_cnt--; |
| handle = (handle_t *)ref_cnt; |
| |
| current->journal_info = handle; |
| } |
| |
| /* |
| * Wrappers for jbd2_journal_start/end. |
| * |
| * The only special thing we need to do here is to make sure that all |
| * journal_end calls result in the superblock being marked dirty, so |
| * that sync() will call the filesystem's write_super callback if |
| * appropriate. |
| * |
| * To avoid j_barrier hold in userspace when a user calls freeze(), |
| * ext4 prevents a new handle from being started by s_frozen, which |
| * is in an upper layer. |
| */ |
| handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) |
| { |
| journal_t *journal; |
| handle_t *handle; |
| |
| trace_ext4_journal_start(sb, nblocks, _RET_IP_); |
| if (sb->s_flags & MS_RDONLY) |
| return ERR_PTR(-EROFS); |
| |
| journal = EXT4_SB(sb)->s_journal; |
| handle = ext4_journal_current_handle(); |
| |
| /* |
| * If a handle has been started, it should be allowed to |
| * finish, otherwise deadlock could happen between freeze |
| * and others(e.g. truncate) due to the restart of the |
| * journal handle if the filesystem is forzen and active |
| * handles are not stopped. |
| */ |
| if (!handle) |
| vfs_check_frozen(sb, SB_FREEZE_TRANS); |
| |
| if (!journal) |
| return ext4_get_nojournal(); |
| /* |
| * Special case here: if the journal has aborted behind our |
| * backs (eg. EIO in the commit thread), then we still need to |
| * take the FS itself readonly cleanly. |
| */ |
| if (is_journal_aborted(journal)) { |
| ext4_abort(sb, "Detected aborted journal"); |
| return ERR_PTR(-EROFS); |
| } |
| return jbd2_journal_start(journal, nblocks); |
| } |
| |
| /* |
| * The only special thing we need to do here is to make sure that all |
| * jbd2_journal_stop calls result in the superblock being marked dirty, so |
| * that sync() will call the filesystem's write_super callback if |
| * appropriate. |
| */ |
| int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle) |
| { |
| struct super_block *sb; |
| int err; |
| int rc; |
| |
| if (!ext4_handle_valid(handle)) { |
| ext4_put_nojournal(handle); |
| return 0; |
| } |
| sb = handle->h_transaction->t_journal->j_private; |
| err = handle->h_err; |
| rc = jbd2_journal_stop(handle); |
| |
| if (!err) |
| err = rc; |
| if (err) |
| __ext4_std_error(sb, where, line, err); |
| return err; |
| } |
| |
| void ext4_journal_abort_handle(const char *caller, unsigned int line, |
| const char *err_fn, struct buffer_head *bh, |
| handle_t *handle, int err) |
| { |
| char nbuf[16]; |
| const char *errstr = ext4_decode_error(NULL, err, nbuf); |
| |
| BUG_ON(!ext4_handle_valid(handle)); |
| |
| if (bh) |
| BUFFER_TRACE(bh, "abort"); |
| |
| if (!handle->h_err) |
| handle->h_err = err; |
| |
| if (is_handle_aborted(handle)) |
| return; |
| |
| printk(KERN_ERR "%s:%d: aborting transaction: %s in %s\n", |
| caller, line, errstr, err_fn); |
| |
| jbd2_journal_abort_handle(handle); |
| } |
| |
| static void __save_error_info(struct super_block *sb, const char *func, |
| unsigned int line) |
| { |
| struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
| |
| EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
| es->s_state |= cpu_to_le16(EXT4_ERROR_FS); |
| es->s_last_error_time = cpu_to_le32(get_seconds()); |
| strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func)); |
| es->s_last_error_line = cpu_to_le32(line); |
| if (!es->s_first_error_time) { |
| es->s_first_error_time = es->s_last_error_time; |
| strncpy(es->s_first_error_func, func, |
| sizeof(es->s_first_error_func)); |
| es->s_first_error_line = cpu_to_le32(line); |
| es->s_first_error_ino = es->s_last_error_ino; |
| es->s_first_error_block = es->s_last_error_block; |
| } |
| /* |
| * Start the daily error reporting function if it hasn't been |
| * started already |
| */ |
| if (!es->s_error_count) |
| mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ); |
| es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1); |
| } |
| |
| static void save_error_info(struct super_block *sb, const char *func, |
| unsigned int line) |
| { |
| __save_error_info(sb, func, line); |
| ext4_commit_super(sb, 1); |
| } |
| |
| /* |
| * The del_gendisk() function uninitializes the disk-specific data |
| * structures, including the bdi structure, without telling anyone |
| * else. Once this happens, any attempt to call mark_buffer_dirty() |
| * (for example, by ext4_commit_super), will cause a kernel OOPS. |
| * This is a kludge to prevent these oops until we can put in a proper |
| * hook in del_gendisk() to inform the VFS and file system layers. |
| */ |
| static int block_device_ejected(struct super_block *sb) |
| { |
| struct inode *bd_inode = sb->s_bdev->bd_inode; |
| struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info; |
| |
| return bdi->dev == NULL; |
| } |
| |
| |
| /* Deal with the reporting of failure conditions on a filesystem such as |
| * inconsistencies detected or read IO failures. |
| * |
| * On ext2, we can store the error state of the filesystem in the |
| * superblock. That is not possible on ext4, because we may have other |
| * write ordering constraints on the superblock which prevent us from |
| * writing it out straight away; and given that the journal is about to |
| * be aborted, we can't rely on the current, or future, transactions to |
| * write out the superblock safely. |
| * |
| * We'll just use the jbd2_journal_abort() error code to record an error in |
| * the journal instead. On recovery, the journal will complain about |
| * that error until we've noted it down and cleared it. |
| */ |
| |
| static void ext4_handle_error(struct super_block *sb) |
| { |
| if (sb->s_flags & MS_RDONLY) |
| return; |
| |
| if (!test_opt(sb, ERRORS_CONT)) { |
| journal_t *journal = EXT4_SB(sb)->s_journal; |
| |
| EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; |
| if (journal) |
| jbd2_journal_abort(journal, -EIO); |
| } |
| if (test_opt(sb, ERRORS_RO)) { |
| ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); |
| sb->s_flags |= MS_RDONLY; |
| } |
| if (test_opt(sb, ERRORS_PANIC)) |
| panic("EXT4-fs (device %s): panic forced after error\n", |
| sb->s_id); |
| } |
| |
| void __ext4_error(struct super_block *sb, const char *function, |
| unsigned int line, const char *fmt, ...) |
| { |
| struct va_format vaf; |
| va_list args; |
| |
| va_start(args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n", |
| sb->s_id, function, line, current->comm, &vaf); |
| va_end(args); |
| save_error_info(sb, function, line); |
| |
| ext4_handle_error(sb); |
| } |
| |
| void ext4_error_inode(struct inode *inode, const char *function, |
| unsigned int line, ext4_fsblk_t block, |
| const char *fmt, ...) |
| { |
| va_list args; |
| struct va_format vaf; |
| struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; |
| |
| es->s_last_error_ino = cpu_to_le32(inode->i_ino); |
| es->s_last_error_block = cpu_to_le64(block); |
| save_error_info(inode->i_sb, function, line); |
| va_start(args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: inode #%lu: ", |
| inode->i_sb->s_id, function, line, inode->i_ino); |
| if (block) |
| printk(KERN_CONT "block %llu: ", block); |
| printk(KERN_CONT "comm %s: %pV\n", current->comm, &vaf); |
| va_end(args); |
| |
| ext4_handle_error(inode->i_sb); |
| } |
| |
| void ext4_error_file(struct file *file, const char *function, |
| unsigned int line, ext4_fsblk_t block, |
| const char *fmt, ...) |
| { |
| va_list args; |
| struct va_format vaf; |
| struct ext4_super_block *es; |
| struct inode *inode = file->f_dentry->d_inode; |
| char pathname[80], *path; |
| |
| es = EXT4_SB(inode->i_sb)->s_es; |
| es->s_last_error_ino = cpu_to_le32(inode->i_ino); |
| save_error_info(inode->i_sb, function, line); |
| path = d_path(&(file->f_path), pathname, sizeof(pathname)); |
| if (IS_ERR(path)) |
| path = "(unknown)"; |
| printk(KERN_CRIT |
| "EXT4-fs error (device %s): %s:%d: inode #%lu: ", |
| inode->i_sb->s_id, function, line, inode->i_ino); |
| if (block) |
| printk(KERN_CONT "block %llu: ", block); |
| va_start(args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| printk(KERN_CONT "comm %s: path %s: %pV\n", current->comm, path, &vaf); |
| va_end(args); |
| |
| ext4_handle_error(inode->i_sb); |
| } |
| |
| static const char *ext4_decode_error(struct super_block *sb, int errno, |
| char nbuf[16]) |
| { |
| char *errstr = NULL; |
| |
| switch (errno) { |
| case -EIO: |
| errstr = "IO failure"; |
| break; |
| case -ENOMEM: |
| errstr = "Out of memory"; |
| break; |
| case -EROFS: |
| if (!sb || (EXT4_SB(sb)->s_journal && |
| EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)) |
| errstr = "Journal has aborted"; |
| else |
| errstr = "Readonly filesystem"; |
| break; |
| default: |
| /* If the caller passed in an extra buffer for unknown |
| * errors, textualise them now. Else we just return |
| * NULL. */ |
| if (nbuf) { |
| /* Check for truncated error codes... */ |
| if (snprintf(nbuf, 16, "error %d", -errno) >= 0) |
| errstr = nbuf; |
| } |
| break; |
| } |
| |
| return errstr; |
| } |
| |
| /* __ext4_std_error decodes expected errors from journaling functions |
| * automatically and invokes the appropriate error response. */ |
| |
| void __ext4_std_error(struct super_block *sb, const char *function, |
| unsigned int line, int errno) |
| { |
| char nbuf[16]; |
| const char *errstr; |
| |
| /* Special case: if the error is EROFS, and we're not already |
| * inside a transaction, then there's really no point in logging |
| * an error. */ |
| if (errno == -EROFS && journal_current_handle() == NULL && |
| (sb->s_flags & MS_RDONLY)) |
| return; |
| |
| errstr = ext4_decode_error(sb, errno, nbuf); |
| printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n", |
| sb->s_id, function, line, errstr); |
| save_error_info(sb, function, line); |
| |
| ext4_handle_error(sb); |
| } |
| |
| /* |
| * ext4_abort is a much stronger failure handler than ext4_error. The |
| * abort function may be used to deal with unrecoverable failures such |
| * as journal IO errors or ENOMEM at a critical moment in log management. |
| * |
| * We unconditionally force the filesystem into an ABORT|READONLY state, |
| * unless the error response on the fs has been set to panic in which |
| * case we take the easy way out and panic immediately. |
| */ |
| |
| void __ext4_abort(struct super_block *sb, const char *function, |
| unsigned int line, const char *fmt, ...) |
| { |
| va_list args; |
| |
| save_error_info(sb, function, line); |
| va_start(args, fmt); |
| printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id, |
| function, line); |
| vprintk(fmt, args); |
| printk("\n"); |
| va_end(args); |
| |
| if ((sb->s_flags & MS_RDONLY) == 0) { |
| ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); |
| sb->s_flags |= MS_RDONLY; |
| EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; |
| if (EXT4_SB(sb)->s_journal) |
| jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); |
| save_error_info(sb, function, line); |
| } |
| if (test_opt(sb, ERRORS_PANIC)) |
| panic("EXT4-fs panic from previous error\n"); |
| } |
| |
| void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...) |
| { |
| struct va_format vaf; |
| va_list args; |
| |
| va_start(args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf); |
| va_end(args); |
| } |
| |
| void __ext4_warning(struct super_block *sb, const char *function, |
| unsigned int line, const char *fmt, ...) |
| { |
| struct va_format vaf; |
| va_list args; |
| |
| va_start(args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n", |
| sb->s_id, function, line, &vaf); |
| va_end(args); |
| } |
| |
| void __ext4_grp_locked_error(const char *function, unsigned int line, |
| struct super_block *sb, ext4_group_t grp, |
| unsigned long ino, ext4_fsblk_t block, |
| const char *fmt, ...) |
| __releases(bitlock) |
| __acquires(bitlock) |
| { |
| struct va_format vaf; |
| va_list args; |
| struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
| |
| es->s_last_error_ino = cpu_to_le32(ino); |
| es->s_last_error_block = cpu_to_le64(block); |
| __save_error_info(sb, function, line); |
| |
| va_start(args, fmt); |
| |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ", |
| sb->s_id, function, line, grp); |
| if (ino) |
| printk(KERN_CONT "inode %lu: ", ino); |
| if (block) |
| printk(KERN_CONT "block %llu:", (unsigned long long) block); |
| printk(KERN_CONT "%pV\n", &vaf); |
| va_end(args); |
| |
| if (test_opt(sb, ERRORS_CONT)) { |
| ext4_commit_super(sb, 0); |
| return; |
| } |
| |
| ext4_unlock_group(sb, grp); |
| ext4_handle_error(sb); |
| /* |
| * We only get here in the ERRORS_RO case; relocking the group |
| * may be dangerous, but nothing bad will happen since the |
| * filesystem will have already been marked read/only and the |
| * journal has been aborted. We return 1 as a hint to callers |
| * who might what to use the return value from |
| * ext4_grp_locked_error() to distinguish between the |
| * ERRORS_CONT and ERRORS_RO case, and perhaps return more |
| * aggressively from the ext4 function in question, with a |
| * more appropriate error code. |
| */ |
| ext4_lock_group(sb, grp); |
| return; |
| } |
| |
| void ext4_update_dynamic_rev(struct super_block *sb) |
| { |
| struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
| |
| if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) |
| return; |
| |
| ext4_warning(sb, |
| "updating to rev %d because of new feature flag, " |
| "running e2fsck is recommended", |
| EXT4_DYNAMIC_REV); |
| |
| es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); |
| es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); |
| es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); |
| /* leave es->s_feature_*compat flags alone */ |
| /* es->s_uuid will be set by e2fsck if empty */ |
| |
| /* |
| * The rest of the superblock fields should be zero, and if not it |
| * means they are likely already in use, so leave them alone. We |
| * can leave it up to e2fsck to clean up any inconsistencies there. |
| */ |
| } |
| |
| /* |
| * Open the external journal device |
| */ |
| static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb) |
| { |
| struct block_device *bdev; |
| char b[BDEVNAME_SIZE]; |
| |
| bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb); |
| if (IS_ERR(bdev)) |
| goto fail; |
| return bdev; |
| |
| fail: |
| ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld", |
| __bdevname(dev, b), PTR_ERR(bdev)); |
| return NULL; |
| } |
| |
| /* |
| * Manage pinning (and unpinning) block bitmaps |
| */ |
| static void ext4_pin_block_bitmaps(struct super_block *sb) |
| { |
| ext4_group_t i, ngroups = ext4_get_groups_count(sb); |
| struct ext4_group_info *grinfo; |
| |
| for (i = 0; i < ngroups; i++) { |
| grinfo = ext4_get_group_info(sb, i); |
| if (!grinfo->bb_bh) |
| grinfo->bb_bh = ext4_read_block_bitmap(sb, i); |
| } |
| } |
| |
| static void ext4_unpin_block_bitmaps(struct super_block *sb) |
| { |
| ext4_group_t i, ngroups = ext4_get_groups_count(sb); |
| struct ext4_group_info *grinfo; |
| |
| for (i = 0; i < ngroups; i++) { |
| grinfo = ext4_get_group_info(sb, i); |
| brelse(grinfo->bb_bh); |
| grinfo->bb_bh = NULL; |
| } |
| } |
| |
| /* |
| * Release the journal device |
| */ |
| static int ext4_blkdev_put(struct block_device *bdev) |
| { |
| return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
| } |
| |
| static int ext4_blkdev_remove(struct ext4_sb_info *sbi) |
| { |
| struct block_device *bdev; |
| int ret = -ENODEV; |
| |
| bdev = sbi->journal_bdev; |
| if (bdev) { |
| ret = ext4_blkdev_put(bdev); |
| sbi->journal_bdev = NULL; |
| } |
| return ret; |
| } |
| |
| static inline struct inode *orphan_list_entry(struct list_head *l) |
| { |
| return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; |
| } |
| |
| static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) |
| { |
| struct list_head *l; |
| |
| ext4_msg(sb, KERN_ERR, "sb orphan head is %d", |
| le32_to_cpu(sbi->s_es->s_last_orphan)); |
| |
| printk(KERN_ERR "sb_info orphan list:\n"); |
| list_for_each(l, &sbi->s_orphan) { |
| struct inode *inode = orphan_list_entry(l); |
| printk(KERN_ERR " " |
| "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", |
| inode->i_sb->s_id, inode->i_ino, inode, |
| inode->i_mode, inode->i_nlink, |
| NEXT_ORPHAN(inode)); |
| } |
| } |
| |
| static void ext4_put_super(struct super_block *sb) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_super_block *es = sbi->s_es; |
| int i, err; |
| |
| ext4_unregister_li_request(sb); |
| dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); |
| |
| flush_workqueue(sbi->dio_unwritten_wq); |
| destroy_workqueue(sbi->dio_unwritten_wq); |
| |
| lock_super(sb); |
| if (sb->s_dirt) |
| ext4_commit_super(sb, 1); |
| |
| if (sbi->s_journal) { |
| err = jbd2_journal_destroy(sbi->s_journal); |
| sbi->s_journal = NULL; |
| if (err < 0) |
| ext4_abort(sb, "Couldn't clean up the journal"); |
| } |
| |
| del_timer(&sbi->s_err_report); |
| ext4_release_system_zone(sb); |
| ext4_unpin_block_bitmaps(sb); |
| ext4_mb_release(sb); |
| ext4_ext_release(sb); |
| ext4_xattr_put_super(sb); |
| |
| if (!(sb->s_flags & MS_RDONLY)) { |
| EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
| es->s_state = cpu_to_le16(sbi->s_mount_state); |
| ext4_commit_super(sb, 1); |
| } |
| if (sbi->s_proc) { |
| remove_proc_entry(sb->s_id, ext4_proc_root); |
| } |
| kobject_del(&sbi->s_kobj); |
| |
| for (i = 0; i < sbi->s_gdb_count; i++) |
| brelse(sbi->s_group_desc[i]); |
| ext4_kvfree(sbi->s_group_desc); |
| ext4_kvfree(sbi->s_flex_groups); |
| percpu_counter_destroy(&sbi->s_freeclusters_counter); |
| percpu_counter_destroy(&sbi->s_freeinodes_counter); |
| percpu_counter_destroy(&sbi->s_dirs_counter); |
| percpu_counter_destroy(&sbi->s_dirtyclusters_counter); |
| brelse(sbi->s_sbh); |
| #ifdef CONFIG_QUOTA |
| for (i = 0; i < MAXQUOTAS; i++) |
| kfree(sbi->s_qf_names[i]); |
| #endif |
| |
| /* Debugging code just in case the in-memory inode orphan list |
| * isn't empty. The on-disk one can be non-empty if we've |
| * detected an error and taken the fs readonly, but the |
| * in-memory list had better be clean by this point. */ |
| if (!list_empty(&sbi->s_orphan)) |
| dump_orphan_list(sb, sbi); |
| J_ASSERT(list_empty(&sbi->s_orphan)); |
| |
| invalidate_bdev(sb->s_bdev); |
| if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { |
| /* |
| * Invalidate the journal device's buffers. We don't want them |
| * floating about in memory - the physical journal device may |
| * hotswapped, and it breaks the `ro-after' testing code. |
| */ |
| sync_blockdev(sbi->journal_bdev); |
| invalidate_bdev(sbi->journal_bdev); |
| ext4_blkdev_remove(sbi); |
| } |
| if (sbi->s_mmp_tsk) |
| kthread_stop(sbi->s_mmp_tsk); |
| sb->s_fs_info = NULL; |
| /* |
| * Now that we are completely done shutting down the |
| * superblock, we need to actually destroy the kobject. |
| */ |
| unlock_super(sb); |
| kobject_put(&sbi->s_kobj); |
| wait_for_completion(&sbi->s_kobj_unregister); |
| kfree(sbi->s_blockgroup_lock); |
| kfree(sbi); |
| } |
| |
| static struct kmem_cache *ext4_inode_cachep; |
| |
| /* |
| * Called inside transaction, so use GFP_NOFS |
| */ |
| static struct inode *ext4_alloc_inode(struct super_block *sb) |
| { |
| struct ext4_inode_info *ei; |
| |
| ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); |
| if (!ei) |
| return NULL; |
| |
| ei->vfs_inode.i_version = 1; |
| ei->vfs_inode.i_data.writeback_index = 0; |
| memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); |
| INIT_LIST_HEAD(&ei->i_prealloc_list); |
| spin_lock_init(&ei->i_prealloc_lock); |
| ei->i_reserved_data_blocks = 0; |
| ei->i_reserved_meta_blocks = 0; |
| ei->i_allocated_meta_blocks = 0; |
| ei->i_da_metadata_calc_len = 0; |
| spin_lock_init(&(ei->i_block_reservation_lock)); |
| #ifdef CONFIG_QUOTA |
| ei->i_reserved_quota = 0; |
| #endif |
| ei->jinode = NULL; |
| INIT_LIST_HEAD(&ei->i_completed_io_list); |
| spin_lock_init(&ei->i_completed_io_lock); |
| ei->cur_aio_dio = NULL; |
| ei->i_sync_tid = 0; |
| ei->i_datasync_tid = 0; |
| atomic_set(&ei->i_ioend_count, 0); |
| atomic_set(&ei->i_aiodio_unwritten, 0); |
| |
| return &ei->vfs_inode; |
| } |
| |
| static int ext4_drop_inode(struct inode *inode) |
| { |
| int drop = generic_drop_inode(inode); |
| |
| trace_ext4_drop_inode(inode, drop); |
| return drop; |
| } |
| |
| static void ext4_i_callback(struct rcu_head *head) |
| { |
| struct inode *inode = container_of(head, struct inode, i_rcu); |
| INIT_LIST_HEAD(&inode->i_dentry); |
| kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); |
| } |
| |
| static void ext4_destroy_inode(struct inode *inode) |
| { |
| if (!list_empty(&(EXT4_I(inode)->i_orphan))) { |
| ext4_msg(inode->i_sb, KERN_ERR, |
| "Inode %lu (%p): orphan list check failed!", |
| inode->i_ino, EXT4_I(inode)); |
| print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, |
| EXT4_I(inode), sizeof(struct ext4_inode_info), |
| true); |
| dump_stack(); |
| } |
| call_rcu(&inode->i_rcu, ext4_i_callback); |
| } |
| |
| static void init_once(void *foo) |
| { |
| struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; |
| |
| INIT_LIST_HEAD(&ei->i_orphan); |
| #ifdef CONFIG_EXT4_FS_XATTR |
| init_rwsem(&ei->xattr_sem); |
| #endif |
| init_rwsem(&ei->i_data_sem); |
| inode_init_once(&ei->vfs_inode); |
| } |
| |
| static int init_inodecache(void) |
| { |
| ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", |
| sizeof(struct ext4_inode_info), |
| 0, (SLAB_RECLAIM_ACCOUNT| |
| SLAB_MEM_SPREAD), |
| init_once); |
| if (ext4_inode_cachep == NULL) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| static void destroy_inodecache(void) |
| { |
| kmem_cache_destroy(ext4_inode_cachep); |
| } |
| |
| void ext4_clear_inode(struct inode *inode) |
| { |
| invalidate_inode_buffers(inode); |
| end_writeback(inode); |
| dquot_drop(inode); |
| ext4_discard_preallocations(inode); |
| if (EXT4_I(inode)->jinode) { |
| jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode), |
| EXT4_I(inode)->jinode); |
| jbd2_free_inode(EXT4_I(inode)->jinode); |
| EXT4_I(inode)->jinode = NULL; |
| } |
| } |
| |
| static inline void ext4_show_quota_options(struct seq_file *seq, |
| struct super_block *sb) |
| { |
| #if defined(CONFIG_QUOTA) |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| |
| if (sbi->s_jquota_fmt) { |
| char *fmtname = ""; |
| |
| switch (sbi->s_jquota_fmt) { |
| case QFMT_VFS_OLD: |
| fmtname = "vfsold"; |
| break; |
| case QFMT_VFS_V0: |
| fmtname = "vfsv0"; |
| break; |
| case QFMT_VFS_V1: |
| fmtname = "vfsv1"; |
| break; |
| } |
| seq_printf(seq, ",jqfmt=%s", fmtname); |
| } |
| |
| if (sbi->s_qf_names[USRQUOTA]) |
| seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); |
| |
| if (sbi->s_qf_names[GRPQUOTA]) |
| seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); |
| |
| if (test_opt(sb, USRQUOTA)) |
| seq_puts(seq, ",usrquota"); |
| |
| if (test_opt(sb, GRPQUOTA)) |
| seq_puts(seq, ",grpquota"); |
| #endif |
| } |
| |
| /* |
| * Show an option if |
| * - it's set to a non-default value OR |
| * - if the per-sb default is different from the global default |
| */ |
| static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) |
| { |
| int def_errors; |
| unsigned long def_mount_opts; |
| struct super_block *sb = vfs->mnt_sb; |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_super_block *es = sbi->s_es; |
| |
| def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
| def_errors = le16_to_cpu(es->s_errors); |
| |
| if (sbi->s_sb_block != 1) |
| seq_printf(seq, ",sb=%llu", sbi->s_sb_block); |
| if (test_opt(sb, MINIX_DF)) |
| seq_puts(seq, ",minixdf"); |
| if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS)) |
| seq_puts(seq, ",grpid"); |
| if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) |
| seq_puts(seq, ",nogrpid"); |
| if (sbi->s_resuid != EXT4_DEF_RESUID || |
| le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { |
| seq_printf(seq, ",resuid=%u", sbi->s_resuid); |
| } |
| if (sbi->s_resgid != EXT4_DEF_RESGID || |
| le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { |
| seq_printf(seq, ",resgid=%u", sbi->s_resgid); |
| } |
| if (test_opt(sb, ERRORS_RO)) { |
| if (def_errors == EXT4_ERRORS_PANIC || |
| def_errors == EXT4_ERRORS_CONTINUE) { |
| seq_puts(seq, ",errors=remount-ro"); |
| } |
| } |
| if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) |
| seq_puts(seq, ",errors=continue"); |
| if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) |
| seq_puts(seq, ",errors=panic"); |
| if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16)) |
| seq_puts(seq, ",nouid32"); |
| if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG)) |
| seq_puts(seq, ",debug"); |
| #ifdef CONFIG_EXT4_FS_XATTR |
| if (test_opt(sb, XATTR_USER)) |
| seq_puts(seq, ",user_xattr"); |
| if (!test_opt(sb, XATTR_USER)) |
| seq_puts(seq, ",nouser_xattr"); |
| #endif |
| #ifdef CONFIG_EXT4_FS_POSIX_ACL |
| if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL)) |
| seq_puts(seq, ",acl"); |
| if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) |
| seq_puts(seq, ",noacl"); |
| #endif |
| if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) { |
| seq_printf(seq, ",commit=%u", |
| (unsigned) (sbi->s_commit_interval / HZ)); |
| } |
| if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) { |
| seq_printf(seq, ",min_batch_time=%u", |
| (unsigned) sbi->s_min_batch_time); |
| } |
| if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) { |
| seq_printf(seq, ",max_batch_time=%u", |
| (unsigned) sbi->s_max_batch_time); |
| } |
| |
| /* |
| * We're changing the default of barrier mount option, so |
| * let's always display its mount state so it's clear what its |
| * status is. |
| */ |
| seq_puts(seq, ",barrier="); |
| seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0"); |
| if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) |
| seq_puts(seq, ",journal_async_commit"); |
| else if (test_opt(sb, JOURNAL_CHECKSUM)) |
| seq_puts(seq, ",journal_checksum"); |
| if (test_opt(sb, I_VERSION)) |
| seq_puts(seq, ",i_version"); |
| if (!test_opt(sb, DELALLOC) && |
| !(def_mount_opts & EXT4_DEFM_NODELALLOC)) |
| seq_puts(seq, ",nodelalloc"); |
| |
| if (!test_opt(sb, MBLK_IO_SUBMIT)) |
| seq_puts(seq, ",nomblk_io_submit"); |
| if (sbi->s_stripe) |
| seq_printf(seq, ",stripe=%lu", sbi->s_stripe); |
| /* |
| * journal mode get enabled in different ways |
| * So just print the value even if we didn't specify it |
| */ |
| if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) |
| seq_puts(seq, ",data=journal"); |
| else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) |
| seq_puts(seq, ",data=ordered"); |
| else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) |
| seq_puts(seq, ",data=writeback"); |
| |
| if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) |
| seq_printf(seq, ",inode_readahead_blks=%u", |
| sbi->s_inode_readahead_blks); |
| |
| if (test_opt(sb, DATA_ERR_ABORT)) |
| seq_puts(seq, ",data_err=abort"); |
| |
| if (test_opt(sb, NO_AUTO_DA_ALLOC)) |
| seq_puts(seq, ",noauto_da_alloc"); |
| |
| if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD)) |
| seq_puts(seq, ",discard"); |
| |
| if (test_opt(sb, NOLOAD)) |
| seq_puts(seq, ",norecovery"); |
| |
| if (test_opt(sb, DIOREAD_NOLOCK)) |
| seq_puts(seq, ",dioread_nolock"); |
| |
| if (test_opt(sb, BLOCK_VALIDITY) && |
| !(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)) |
| seq_puts(seq, ",block_validity"); |
| |
| if (!test_opt(sb, INIT_INODE_TABLE)) |
| seq_puts(seq, ",noinit_itable"); |
| else if (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT) |
| seq_printf(seq, ",init_itable=%u", |
| (unsigned) sbi->s_li_wait_mult); |
| |
| if (sbi->no_hide_stale_gid != -1) |
| seq_printf(seq, ",nohide_stale_gid=%u", sbi->no_hide_stale_gid); |
| |
| if (test_opt(sb, PIN_BLOCK_BITMAPS)) |
| seq_puts(seq, ",pin_block_bitmaps"); |
| |
| ext4_show_quota_options(seq, sb); |
| |
| return 0; |
| } |
| |
| static struct inode *ext4_nfs_get_inode(struct super_block *sb, |
| u64 ino, u32 generation) |
| { |
| struct inode *inode; |
| |
| if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) |
| return ERR_PTR(-ESTALE); |
| if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) |
| return ERR_PTR(-ESTALE); |
| |
| /* iget isn't really right if the inode is currently unallocated!! |
| * |
| * ext4_read_inode will return a bad_inode if the inode had been |
| * deleted, so we should be safe. |
| * |
| * Currently we don't know the generation for parent directory, so |
| * a generation of 0 means "accept any" |
| */ |
| inode = ext4_iget(sb, ino); |
| if (IS_ERR(inode)) |
| return ERR_CAST(inode); |
| if (generation && inode->i_generation != generation) { |
| iput(inode); |
| return ERR_PTR(-ESTALE); |
| } |
| |
| return inode; |
| } |
| |
| static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, |
| int fh_len, int fh_type) |
| { |
| return generic_fh_to_dentry(sb, fid, fh_len, fh_type, |
| ext4_nfs_get_inode); |
| } |
| |
| static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, |
| int fh_len, int fh_type) |
| { |
| return generic_fh_to_parent(sb, fid, fh_len, fh_type, |
| ext4_nfs_get_inode); |
| } |
| |
| /* |
| * Try to release metadata pages (indirect blocks, directories) which are |
| * mapped via the block device. Since these pages could have journal heads |
| * which would prevent try_to_free_buffers() from freeing them, we must use |
| * jbd2 layer's try_to_free_buffers() function to release them. |
| */ |
| static int bdev_try_to_free_page(struct super_block *sb, struct page *page, |
| gfp_t wait) |
| { |
| journal_t *journal = EXT4_SB(sb)->s_journal; |
| |
| WARN_ON(PageChecked(page)); |
| if (!page_has_buffers(page)) |
| return 0; |
| if (journal) |
| return jbd2_journal_try_to_free_buffers(journal, page, |
| wait & ~__GFP_WAIT); |
| return try_to_free_buffers(page); |
| } |
| |
| #ifdef CONFIG_QUOTA |
| #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group") |
| #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) |
| |
| static int ext4_write_dquot(struct dquot *dquot); |
| static int ext4_acquire_dquot(struct dquot *dquot); |
| static int ext4_release_dquot(struct dquot *dquot); |
| static int ext4_mark_dquot_dirty(struct dquot *dquot); |
| static int ext4_write_info(struct super_block *sb, int type); |
| static int ext4_quota_on(struct super_block *sb, int type, int format_id, |
| struct path *path); |
| static int ext4_quota_off(struct super_block *sb, int type); |
| static int ext4_quota_on_mount(struct super_block *sb, int type); |
| static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, |
| size_t len, loff_t off); |
| static ssize_t ext4_quota_write(struct super_block *sb, int type, |
| const char *data, size_t len, loff_t off); |
| |
| static const struct dquot_operations ext4_quota_operations = { |
| .get_reserved_space = ext4_get_reserved_space, |
| .write_dquot = ext4_write_dquot, |
| .acquire_dquot = ext4_acquire_dquot, |
| .release_dquot = ext4_release_dquot, |
| .mark_dirty = ext4_mark_dquot_dirty, |
| .write_info = ext4_write_info, |
| .alloc_dquot = dquot_alloc, |
| .destroy_dquot = dquot_destroy, |
| }; |
| |
| static const struct quotactl_ops ext4_qctl_operations = { |
| .quota_on = ext4_quota_on, |
| .quota_off = ext4_quota_off, |
| .quota_sync = dquot_quota_sync, |
| .get_info = dquot_get_dqinfo, |
| .set_info = dquot_set_dqinfo, |
| .get_dqblk = dquot_get_dqblk, |
| .set_dqblk = dquot_set_dqblk |
| }; |
| #endif |
| |
| static const struct super_operations ext4_sops = { |
| .alloc_inode = ext4_alloc_inode, |
| .destroy_inode = ext4_destroy_inode, |
| .write_inode = ext4_write_inode, |
| .dirty_inode = ext4_dirty_inode, |
| .drop_inode = ext4_drop_inode, |
| .evict_inode = ext4_evict_inode, |
| .put_super = ext4_put_super, |
| .sync_fs = ext4_sync_fs, |
| .freeze_fs = ext4_freeze, |
| .unfreeze_fs = ext4_unfreeze, |
| .statfs = ext4_statfs, |
| .remount_fs = ext4_remount, |
| .show_options = ext4_show_options, |
| #ifdef CONFIG_QUOTA |
| .quota_read = ext4_quota_read, |
| .quota_write = ext4_quota_write, |
| #endif |
| .bdev_try_to_free_page = bdev_try_to_free_page, |
| }; |
| |
| static const struct super_operations ext4_nojournal_sops = { |
| .alloc_inode = ext4_alloc_inode, |
| .destroy_inode = ext4_destroy_inode, |
| .write_inode = ext4_write_inode, |
| .dirty_inode = ext4_dirty_inode, |
| .drop_inode = ext4_drop_inode, |
| .evict_inode = ext4_evict_inode, |
| .write_super = ext4_write_super, |
| .put_super = ext4_put_super, |
| .statfs = ext4_statfs, |
| .remount_fs = ext4_remount, |
| .show_options = ext4_show_options, |
| #ifdef CONFIG_QUOTA |
| .quota_read = ext4_quota_read, |
| .quota_write = ext4_quota_write, |
| #endif |
| .bdev_try_to_free_page = bdev_try_to_free_page, |
| }; |
| |
| static const struct export_operations ext4_export_ops = { |
| .fh_to_dentry = ext4_fh_to_dentry, |
| .fh_to_parent = ext4_fh_to_parent, |
| .get_parent = ext4_get_parent, |
| }; |
| |
| enum { |
| Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, |
| Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, |
| Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov, |
| Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, |
| Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh, |
| Opt_commit, Opt_min_batch_time, Opt_max_batch_time, |
| Opt_journal_update, Opt_journal_dev, |
| Opt_journal_checksum, Opt_journal_async_commit, |
| Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, |
| Opt_data_err_abort, Opt_data_err_ignore, |
| Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, |
| Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, |
| Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err, |
| Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version, |
| Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit, |
| Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity, |
| Opt_inode_readahead_blks, Opt_journal_ioprio, |
| Opt_dioread_nolock, Opt_dioread_lock, |
| Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable, |
| Opt_nohide_stale_gid, |
| Opt_pin_block_bitmaps, Opt_nopin_block_bitmaps, |
| }; |
| |
| static const match_table_t tokens = { |
| {Opt_bsd_df, "bsddf"}, |
| {Opt_minix_df, "minixdf"}, |
| {Opt_grpid, "grpid"}, |
| {Opt_grpid, "bsdgroups"}, |
| {Opt_nogrpid, "nogrpid"}, |
| {Opt_nogrpid, "sysvgroups"}, |
| {Opt_resgid, "resgid=%u"}, |
| {Opt_resuid, "resuid=%u"}, |
| {Opt_sb, "sb=%u"}, |
| {Opt_err_cont, "errors=continue"}, |
| {Opt_err_panic, "errors=panic"}, |
| {Opt_err_ro, "errors=remount-ro"}, |
| {Opt_nouid32, "nouid32"}, |
| {Opt_debug, "debug"}, |
| {Opt_oldalloc, "oldalloc"}, |
| {Opt_orlov, "orlov"}, |
| {Opt_user_xattr, "user_xattr"}, |
| {Opt_nouser_xattr, "nouser_xattr"}, |
| {Opt_acl, "acl"}, |
| {Opt_noacl, "noacl"}, |
| {Opt_noload, "noload"}, |
| {Opt_noload, "norecovery"}, |
| {Opt_nobh, "nobh"}, |
| {Opt_bh, "bh"}, |
| {Opt_commit, "commit=%u"}, |
| {Opt_min_batch_time, "min_batch_time=%u"}, |
| {Opt_max_batch_time, "max_batch_time=%u"}, |
| {Opt_journal_update, "journal=update"}, |
| {Opt_journal_dev, "journal_dev=%u"}, |
| {Opt_journal_checksum, "journal_checksum"}, |
| {Opt_journal_async_commit, "journal_async_commit"}, |
| {Opt_abort, "abort"}, |
| {Opt_data_journal, "data=journal"}, |
| {Opt_data_ordered, "data=ordered"}, |
| {Opt_data_writeback, "data=writeback"}, |
| {Opt_data_err_abort, "data_err=abort"}, |
| {Opt_data_err_ignore, "data_err=ignore"}, |
| {Opt_offusrjquota, "usrjquota="}, |
| {Opt_usrjquota, "usrjquota=%s"}, |
| {Opt_offgrpjquota, "grpjquota="}, |
| {Opt_grpjquota, "grpjquota=%s"}, |
| {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, |
| {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, |
| {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"}, |
| {Opt_grpquota, "grpquota"}, |
| {Opt_noquota, "noquota"}, |
| {Opt_quota, "quota"}, |
| {Opt_usrquota, "usrquota"}, |
| {Opt_barrier, "barrier=%u"}, |
| {Opt_barrier, "barrier"}, |
| {Opt_nobarrier, "nobarrier"}, |
| {Opt_i_version, "i_version"}, |
| {Opt_stripe, "stripe=%u"}, |
| {Opt_resize, "resize"}, |
| {Opt_delalloc, "delalloc"}, |
| {Opt_nodelalloc, "nodelalloc"}, |
| {Opt_mblk_io_submit, "mblk_io_submit"}, |
| {Opt_nomblk_io_submit, "nomblk_io_submit"}, |
| {Opt_block_validity, "block_validity"}, |
| {Opt_noblock_validity, "noblock_validity"}, |
| {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, |
| {Opt_journal_ioprio, "journal_ioprio=%u"}, |
| {Opt_auto_da_alloc, "auto_da_alloc=%u"}, |
| {Opt_auto_da_alloc, "auto_da_alloc"}, |
| {Opt_noauto_da_alloc, "noauto_da_alloc"}, |
| {Opt_dioread_nolock, "dioread_nolock"}, |
| {Opt_dioread_lock, "dioread_lock"}, |
| {Opt_discard, "discard"}, |
| {Opt_nodiscard, "nodiscard"}, |
| {Opt_init_itable, "init_itable=%u"}, |
| {Opt_init_itable, "init_itable"}, |
| {Opt_noinit_itable, "noinit_itable"}, |
| {Opt_nohide_stale_gid, "nohide_stale_gid=%u"}, |
| {Opt_pin_block_bitmaps, "pin_block_bitmaps"}, |
| {Opt_nopin_block_bitmaps, "nopin_block_bitmaps"}, |
| {Opt_err, NULL}, |
| }; |
| |
| static ext4_fsblk_t get_sb_block(void **data) |
| { |
| ext4_fsblk_t sb_block; |
| char *options = (char *) *data; |
| |
| if (!options || strncmp(options, "sb=", 3) != 0) |
| return 1; /* Default location */ |
| |
| options += 3; |
| /* TODO: use simple_strtoll with >32bit ext4 */ |
| sb_block = simple_strtoul(options, &options, 0); |
| if (*options && *options != ',') { |
| printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", |
| (char *) *data); |
| return 1; |
| } |
| if (*options == ',') |
| options++; |
| *data = (void *) options; |
| |
| return sb_block; |
| } |
| |
| #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3)) |
| static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n" |
| "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n"; |
| |
| #ifdef CONFIG_QUOTA |
| static int set_qf_name(struct super_block *sb, int qtype, substring_t *args) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| char *qname; |
| |
| if (sb_any_quota_loaded(sb) && |
| !sbi->s_qf_names[qtype]) { |
| ext4_msg(sb, KERN_ERR, |
| "Cannot change journaled " |
| "quota options when quota turned on"); |
| return 0; |
| } |
| qname = match_strdup(args); |
| if (!qname) { |
| ext4_msg(sb, KERN_ERR, |
| "Not enough memory for storing quotafile name"); |
| return 0; |
| } |
| if (sbi->s_qf_names[qtype] && |
| strcmp(sbi->s_qf_names[qtype], qname)) { |
| ext4_msg(sb, KERN_ERR, |
| "%s quota file already specified", QTYPE2NAME(qtype)); |
| kfree(qname); |
| return 0; |
| } |
| sbi->s_qf_names[qtype] = qname; |
| if (strchr(sbi->s_qf_names[qtype], '/')) { |
| ext4_msg(sb, KERN_ERR, |
| "quotafile must be on filesystem root"); |
| kfree(sbi->s_qf_names[qtype]); |
| sbi->s_qf_names[qtype] = NULL; |
| return 0; |
| } |
| set_opt(sb, QUOTA); |
| return 1; |
| } |
| |
| static int clear_qf_name(struct super_block *sb, int qtype) |
| { |
| |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| |
| if (sb_any_quota_loaded(sb) && |
| sbi->s_qf_names[qtype]) { |
| ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options" |
| " when quota turned on"); |
| return 0; |
| } |
| /* |
| * The space will be released later when all options are confirmed |
| * to be correct |
| */ |
| sbi->s_qf_names[qtype] = NULL; |
| return 1; |
| } |
| #endif |
| |
| static int parse_options(char *options, struct super_block *sb, |
| unsigned long *journal_devnum, |
| unsigned int *journal_ioprio, |
| ext4_fsblk_t *n_blocks_count, int is_remount) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| char *p; |
| substring_t args[MAX_OPT_ARGS]; |
| int data_opt = 0; |
| int option; |
| #ifdef CONFIG_QUOTA |
| int qfmt; |
| #endif |
| |
| if (!options) |
| return 1; |
| |
| while ((p = strsep(&options, ",")) != NULL) { |
| int token; |
| if (!*p) |
| continue; |
| |
| /* |
| * Initialize args struct so we know whether arg was |
| * found; some options take optional arguments. |
| */ |
| args[0].to = args[0].from = NULL; |
| token = match_token(p, tokens, args); |
| switch (token) { |
| case Opt_bsd_df: |
| ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38"); |
| clear_opt(sb, MINIX_DF); |
| break; |
| case Opt_minix_df: |
| ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38"); |
| set_opt(sb, MINIX_DF); |
| |
| break; |
| case Opt_grpid: |
| ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38"); |
| set_opt(sb, GRPID); |
| |
| break; |
| case Opt_nogrpid: |
| ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38"); |
| clear_opt(sb, GRPID); |
| |
| break; |
| case Opt_resuid: |
| if (match_int(&args[0], &option)) |
| return 0; |
| sbi->s_resuid = option; |
| break; |
| case Opt_resgid: |
| if (match_int(&args[0], &option)) |
| return 0; |
| sbi->s_resgid = option; |
| break; |
| case Opt_sb: |
| /* handled by get_sb_block() instead of here */ |
| /* *sb_block = match_int(&args[0]); */ |
| break; |
| case Opt_err_panic: |
| clear_opt(sb, ERRORS_CONT); |
| clear_opt(sb, ERRORS_RO); |
| set_opt(sb, ERRORS_PANIC); |
| break; |
| case Opt_err_ro: |
| clear_opt(sb, ERRORS_CONT); |
| clear_opt(sb, ERRORS_PANIC); |
| set_opt(sb, ERRORS_RO); |
| break; |
| case Opt_err_cont: |
| clear_opt(sb, ERRORS_RO); |
| clear_opt(sb, ERRORS_PANIC); |
| set_opt(sb, ERRORS_CONT); |
| break; |
| case Opt_nouid32: |
| set_opt(sb, NO_UID32); |
| break; |
| case Opt_debug: |
| set_opt(sb, DEBUG); |
| break; |
| case Opt_oldalloc: |
| ext4_msg(sb, KERN_WARNING, |
| "Ignoring deprecated oldalloc option"); |
| break; |
| case Opt_orlov: |
| ext4_msg(sb, KERN_WARNING, |
| "Ignoring deprecated orlov option"); |
| break; |
| #ifdef CONFIG_EXT4_FS_XATTR |
| case Opt_user_xattr: |
| set_opt(sb, XATTR_USER); |
| break; |
| case Opt_nouser_xattr: |
| clear_opt(sb, XATTR_USER); |
| break; |
| #else |
| case Opt_user_xattr: |
| case Opt_nouser_xattr: |
| ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported"); |
| break; |
| #endif |
| #ifdef CONFIG_EXT4_FS_POSIX_ACL |
| case Opt_acl: |
| set_opt(sb, POSIX_ACL); |
| break; |
| case Opt_noacl: |
| clear_opt(sb, POSIX_ACL); |
| break; |
| #else |
| case Opt_acl: |
| case Opt_noacl: |
| ext4_msg(sb, KERN_ERR, "(no)acl options not supported"); |
| break; |
| #endif |
| case Opt_journal_update: |
| /* @@@ FIXME */ |
| /* Eventually we will want to be able to create |
| a journal file here. For now, only allow the |
| user to specify an existing inode to be the |
| journal file. */ |
| if (is_remount) { |
| ext4_msg(sb, KERN_ERR, |
| "Cannot specify journal on remount"); |
| return 0; |
| } |
| set_opt(sb, UPDATE_JOURNAL); |
| break; |
| case Opt_journal_dev: |
| if (is_remount) { |
| ext4_msg(sb, KERN_ERR, |
| "Cannot specify journal on remount"); |
| return 0; |
| } |
| if (match_int(&args[0], &option)) |
| return 0; |
| *journal_devnum = option; |
| break; |
| case Opt_journal_checksum: |
| set_opt(sb, JOURNAL_CHECKSUM); |
| break; |
| case Opt_journal_async_commit: |
| set_opt(sb, JOURNAL_ASYNC_COMMIT); |
| set_opt(sb, JOURNAL_CHECKSUM); |
| break; |
| case Opt_noload: |
| set_opt(sb, NOLOAD); |
| break; |
| case Opt_commit: |
| if (match_int(&args[0], &option)) |
| return 0; |
| if (option < 0) |
| return 0; |
| if (option == 0) |
| option = JBD2_DEFAULT_MAX_COMMIT_AGE; |
| sbi->s_commit_interval = HZ * option; |
| break; |
| case Opt_max_batch_time: |
| if (match_int(&args[0], &option)) |
| return 0; |
| if (option < 0) |
| return 0; |
| if (option == 0) |
| option = EXT4_DEF_MAX_BATCH_TIME; |
| sbi->s_max_batch_time = option; |
| break; |
| case Opt_min_batch_time: |
| if (match_int(&args[0], &option)) |
| return 0; |
| if (option < 0) |
| return 0; |
| sbi->s_min_batch_time = option; |
| break; |
| case Opt_data_journal: |
| data_opt = EXT4_MOUNT_JOURNAL_DATA; |
| goto datacheck; |
| case Opt_data_ordered: |
| data_opt = EXT4_MOUNT_ORDERED_DATA; |
| goto datacheck; |
| case Opt_data_writeback: |
| data_opt = EXT4_MOUNT_WRITEBACK_DATA; |
| datacheck: |
| if (is_remount) { |
| if (!sbi->s_journal) |
| ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option"); |
| else if (test_opt(sb, DATA_FLAGS) != data_opt) { |
| ext4_msg(sb, KERN_ERR, |
| "Cannot change data mode on remount"); |
| return 0; |
| } |
| } else { |
| clear_opt(sb, DATA_FLAGS); |
| sbi->s_mount_opt |= data_opt; |
| } |
| break; |
| case Opt_data_err_abort: |
| set_opt(sb, DATA_ERR_ABORT); |
| break; |
| case Opt_data_err_ignore: |
| clear_opt(sb, DATA_ERR_ABORT); |
| break; |
| #ifdef CONFIG_QUOTA |
| case Opt_usrjquota: |
| if (!set_qf_name(sb, USRQUOTA, &args[0])) |
| return 0; |
| break; |
| case Opt_grpjquota: |
| if (!set_qf_name(sb, GRPQUOTA, &args[0])) |
| return 0; |
| break; |
| case Opt_offusrjquota: |
| if (!clear_qf_name(sb, USRQUOTA)) |
| return 0; |
| break; |
| case Opt_offgrpjquota: |
| if (!clear_qf_name(sb, GRPQUOTA)) |
| return 0; |
| break; |
| |
| case Opt_jqfmt_vfsold: |
| qfmt = QFMT_VFS_OLD; |
| goto set_qf_format; |
| case Opt_jqfmt_vfsv0: |
| qfmt = QFMT_VFS_V0; |
| goto set_qf_format; |
| case Opt_jqfmt_vfsv1: |
| qfmt = QFMT_VFS_V1; |
| set_qf_format: |
| if (sb_any_quota_loaded(sb) && |
| sbi->s_jquota_fmt != qfmt) { |
| ext4_msg(sb, KERN_ERR, "Cannot change " |
| "journaled quota options when " |
| "quota turned on"); |
| return 0; |
| } |
| sbi->s_jquota_fmt = qfmt; |
| break; |
| case Opt_quota: |
| case Opt_usrquota: |
| set_opt(sb, QUOTA); |
| set_opt(sb, USRQUOTA); |
| break; |
| case Opt_grpquota: |
| set_opt(sb, QUOTA); |
| set_opt(sb, GRPQUOTA); |
| break; |
| case Opt_noquota: |
| if (sb_any_quota_loaded(sb)) { |
| ext4_msg(sb, KERN_ERR, "Cannot change quota " |
| "options when quota turned on"); |
| return 0; |
| } |
| clear_opt(sb, QUOTA); |
| clear_opt(sb, USRQUOTA); |
| clear_opt(sb, GRPQUOTA); |
| break; |
| #else |
| case Opt_quota: |
| case Opt_usrquota: |
| case Opt_grpquota: |
| ext4_msg(sb, KERN_ERR, |
| "quota options not supported"); |
| break; |
| case Opt_usrjquota: |
| case Opt_grpjquota: |
| case Opt_offusrjquota: |
| case Opt_offgrpjquota: |
| case Opt_jqfmt_vfsold: |
| case Opt_jqfmt_vfsv0: |
| case Opt_jqfmt_vfsv1: |
| ext4_msg(sb, KERN_ERR, |
| "journaled quota options not supported"); |
| break; |
| case Opt_noquota: |
| break; |
| #endif |
| case Opt_abort: |
| sbi->s_mount_flags |= EXT4_MF_FS_ABORTED; |
| break; |
| case Opt_nobarrier: |
| clear_opt(sb, BARRIER); |
| break; |
| case Opt_barrier: |
| if (args[0].from) { |
| if (match_int(&args[0], &option)) |
| return 0; |
| } else |
| option = 1; /* No argument, default to 1 */ |
| if (option) |
| set_opt(sb, BARRIER); |
| else |
| clear_opt(sb, BARRIER); |
| break; |
| case Opt_ignore: |
| break; |
| case Opt_resize: |
| if (!is_remount) { |
| ext4_msg(sb, KERN_ERR, |
| "resize option only available " |
| "for remount"); |
| return 0; |
| } |
| if (match_int(&args[0], &option) != 0) |
| return 0; |
| *n_blocks_count = option; |
| break; |
| case Opt_nobh: |
| ext4_msg(sb, KERN_WARNING, |
| "Ignoring deprecated nobh option"); |
| break; |
| case Opt_bh: |
| ext4_msg(sb, KERN_WARNING, |
| "Ignoring deprecated bh option"); |
| break; |
| case Opt_i_version: |
| set_opt(sb, I_VERSION); |
| sb->s_flags |= MS_I_VERSION; |
| break; |
| case Opt_nodelalloc: |
| clear_opt(sb, DELALLOC); |
| clear_opt2(sb, EXPLICIT_DELALLOC); |
| break; |
| case Opt_mblk_io_submit: |
| set_opt(sb, MBLK_IO_SUBMIT); |
| break; |
| case Opt_nomblk_io_submit: |
| clear_opt(sb, MBLK_IO_SUBMIT); |
| break; |
| case Opt_stripe: |
| if (match_int(&args[0], &option)) |
| return 0; |
| if (option < 0) |
| return 0; |
| sbi->s_stripe = option; |
| break; |
| case Opt_delalloc: |
| set_opt(sb, DELALLOC); |
| set_opt2(sb, EXPLICIT_DELALLOC); |
| break; |
| case Opt_block_validity: |
| set_opt(sb, BLOCK_VALIDITY); |
| break; |
| case Opt_noblock_validity: |
| clear_opt(sb, BLOCK_VALIDITY); |
| break; |
| case Opt_inode_readahead_blks: |
| if (match_int(&args[0], &option)) |
| return 0; |
| if (option < 0 || option > (1 << 30)) |
| return 0; |
| if (option && !is_power_of_2(option)) { |
| ext4_msg(sb, KERN_ERR, |
| "EXT4-fs: inode_readahead_blks" |
| " must be a power of 2"); |
| return 0; |
| } |
| sbi->s_inode_readahead_blks = option; |
| break; |
| case Opt_journal_ioprio: |
| if (match_int(&args[0], &option)) |
| return 0; |
| if (option < 0 || option > 7) |
| break; |
| *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, |
| option); |
| break; |
| case Opt_noauto_da_alloc: |
| set_opt(sb, NO_AUTO_DA_ALLOC); |
| break; |
| case Opt_auto_da_alloc: |
| if (args[0].from) { |
| if (match_int(&args[0], &option)) |
| return 0; |
| } else |
| option = 1; /* No argument, default to 1 */ |
| if (option) |
| clear_opt(sb, NO_AUTO_DA_ALLOC); |
| else |
| set_opt(sb,NO_AUTO_DA_ALLOC); |
| break; |
| case Opt_discard: |
| set_opt(sb, DISCARD); |
| break; |
| case Opt_nodiscard: |
| clear_opt(sb, DISCARD); |
| break; |
| case Opt_dioread_nolock: |
| set_opt(sb, DIOREAD_NOLOCK); |
| break; |
| case Opt_dioread_lock: |
| clear_opt(sb, DIOREAD_NOLOCK); |
| break; |
| case Opt_init_itable: |
| set_opt(sb, INIT_INODE_TABLE); |
| if (args[0].from) { |
| if (match_int(&args[0], &option)) |
| return 0; |
| } else |
| option = EXT4_DEF_LI_WAIT_MULT; |
| if (option < 0) |
| return 0; |
| sbi->s_li_wait_mult = option; |
| break; |
| case Opt_nohide_stale_gid: |
| if (match_int(&args[0], &option)) |
| return 0; |
| /* -1 for disabled, otherwise it's valid. */ |
| sbi->no_hide_stale_gid = option; |
| break; |
| case Opt_noinit_itable: |
| clear_opt(sb, INIT_INODE_TABLE); |
| break; |
| case Opt_pin_block_bitmaps: |
| set_opt(sb, PIN_BLOCK_BITMAPS); |
| break; |
| case Opt_nopin_block_bitmaps: |
| clear_opt(sb, PIN_BLOCK_BITMAPS); |
| break; |
| default: |
| ext4_msg(sb, KERN_ERR, |
| "Unrecognized mount option \"%s\" " |
| "or missing value", p); |
| return 0; |
| } |
| } |
| #ifdef CONFIG_QUOTA |
| if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { |
| if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA]) |
| clear_opt(sb, USRQUOTA); |
| |
| if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA]) |
| clear_opt(sb, GRPQUOTA); |
| |
| if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) { |
| ext4_msg(sb, KERN_ERR, "old and new quota " |
| "format mixing"); |
| return 0; |
| } |
| |
| if (!sbi->s_jquota_fmt) { |
| ext4_msg(sb, KERN_ERR, "journaled quota format " |
| "not specified"); |
| return 0; |
| } |
| } else { |
| if (sbi->s_jquota_fmt) { |
| ext4_msg(sb, KERN_ERR, "journaled quota format " |
| "specified with no journaling " |
| "enabled"); |
| return 0; |
| } |
| } |
| #endif |
| return 1; |
| } |
| |
| static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, |
| int read_only) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| int res = 0; |
| |
| if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { |
| ext4_msg(sb, KERN_ERR, "revision level too high, " |
| "forcing read-only mode"); |
| res = MS_RDONLY; |
| } |
| if (read_only) |
| goto done; |
| if (!(sbi->s_mount_state & EXT4_VALID_FS)) |
| ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, " |
| "running e2fsck is recommended"); |
| else if ((sbi->s_mount_state & EXT4_ERROR_FS)) |
| ext4_msg(sb, KERN_WARNING, |
| "warning: mounting fs with errors, " |
| "running e2fsck is recommended"); |
| else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 && |
| le16_to_cpu(es->s_mnt_count) >= |
| (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) |
| ext4_msg(sb, KERN_WARNING, |
| "warning: maximal mount count reached, " |
| "running e2fsck is recommended"); |
| else if (le32_to_cpu(es->s_checkinterval) && |
| (le32_to_cpu(es->s_lastcheck) + |
| le32_to_cpu(es->s_checkinterval) <= get_seconds())) |
| ext4_msg(sb, KERN_WARNING, |
| "warning: checktime reached, " |
| "running e2fsck is recommended"); |
| if (!sbi->s_journal) |
| es->s_state &= cpu_to_le16(~EXT4_VALID_FS); |
| if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) |
| es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); |
| le16_add_cpu(&es->s_mnt_count, 1); |
| es->s_mtime = cpu_to_le32(get_seconds()); |
| ext4_update_dynamic_rev(sb); |
| if (sbi->s_journal) |
| EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
| |
| ext4_commit_super(sb, 1); |
| done: |
| if (test_opt(sb, DEBUG)) |
| printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, " |
| "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n", |
| sb->s_blocksize, |
| sbi->s_groups_count, |
| EXT4_BLOCKS_PER_GROUP(sb), |
| EXT4_INODES_PER_GROUP(sb), |
| sbi->s_mount_opt, sbi->s_mount_opt2); |
| |
| cleancache_init_fs(sb); |
| return res; |
| } |
| |
| static int ext4_fill_flex_info(struct super_block *sb) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_group_desc *gdp = NULL; |
| ext4_group_t flex_group_count; |
| ext4_group_t flex_group; |
| unsigned int groups_per_flex = 0; |
| size_t size; |
| int i; |
| |
| sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; |
| if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) { |
| sbi->s_log_groups_per_flex = 0; |
| return 1; |
| } |
| groups_per_flex = 1 << sbi->s_log_groups_per_flex; |
| |
| /* We allocate both existing and potentially added groups */ |
| flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) + |
| ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) << |
| EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex; |
| size = flex_group_count * sizeof(struct flex_groups); |
| sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL); |
| if (sbi->s_flex_groups == NULL) { |
| ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups", |
| flex_group_count); |
| goto failed; |
| } |
| |
| for (i = 0; i < sbi->s_groups_count; i++) { |
| gdp = ext4_get_group_desc(sb, i, NULL); |
| |
| flex_group = ext4_flex_group(sbi, i); |
| atomic_add(ext4_free_inodes_count(sb, gdp), |
| &sbi->s_flex_groups[flex_group].free_inodes); |
| atomic_add(ext4_free_group_clusters(sb, gdp), |
| &sbi->s_flex_groups[flex_group].free_clusters); |
| atomic_add(ext4_used_dirs_count(sb, gdp), |
| &sbi->s_flex_groups[flex_group].used_dirs); |
| } |
| |
| return 1; |
| failed: |
| return 0; |
| } |
| |
| __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, |
| struct ext4_group_desc *gdp) |
| { |
| __u16 crc = 0; |
| |
| if (sbi->s_es->s_feature_ro_compat & |
| cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { |
| int offset = offsetof(struct ext4_group_desc, bg_checksum); |
| __le32 le_group = cpu_to_le32(block_group); |
| |
| crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); |
| crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); |
| crc = crc16(crc, (__u8 *)gdp, offset); |
| offset += sizeof(gdp->bg_checksum); /* skip checksum */ |
| /* for checksum of struct ext4_group_desc do the rest...*/ |
| if ((sbi->s_es->s_feature_incompat & |
| cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && |
| offset < le16_to_cpu(sbi->s_es->s_desc_size)) |
| crc = crc16(crc, (__u8 *)gdp + offset, |
| le16_to_cpu(sbi->s_es->s_desc_size) - |
| offset); |
| } |
| |
| return cpu_to_le16(crc); |
| } |
| |
| int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, |
| struct ext4_group_desc *gdp) |
| { |
| if ((sbi->s_es->s_feature_ro_compat & |
| cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && |
| (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) |
| return 0; |
| |
| return 1; |
| } |
| |
| /* Called at mount-time, super-block is locked */ |
| static int ext4_check_descriptors(struct super_block *sb, |
| ext4_group_t *first_not_zeroed) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); |
| ext4_fsblk_t last_block; |
| ext4_fsblk_t block_bitmap; |
| ext4_fsblk_t inode_bitmap; |
| ext4_fsblk_t inode_table; |
| int flexbg_flag = 0; |
| ext4_group_t i, grp = sbi->s_groups_count; |
| |
| if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) |
| flexbg_flag = 1; |
| |
| ext4_debug("Checking group descriptors"); |
| |
| for (i = 0; i < sbi->s_groups_count; i++) { |
| struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); |
| |
| if (i == sbi->s_groups_count - 1 || flexbg_flag) |
| last_block = ext4_blocks_count(sbi->s_es) - 1; |
| else |
| last_block = first_block + |
| (EXT4_BLOCKS_PER_GROUP(sb) - 1); |
| |
| if ((grp == sbi->s_groups_count) && |
| !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) |
| grp = i; |
| |
| block_bitmap = ext4_block_bitmap(sb, gdp); |
| if (block_bitmap < first_block || block_bitmap > last_block) { |
| ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " |
| "Block bitmap for group %u not in group " |
| "(block %llu)!", i, block_bitmap); |
| return 0; |
| } |
| inode_bitmap = ext4_inode_bitmap(sb, gdp); |
| if (inode_bitmap < first_block || inode_bitmap > last_block) { |
| ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " |
| "Inode bitmap for group %u not in group " |
| "(block %llu)!", i, inode_bitmap); |
| return 0; |
| } |
| inode_table = ext4_inode_table(sb, gdp); |
| if (inode_table < first_block || |
| inode_table + sbi->s_itb_per_group - 1 > last_block) { |
| ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " |
| "Inode table for group %u not in group " |
| "(block %llu)!", i, inode_table); |
| return 0; |
| } |
| ext4_lock_group(sb, i); |
| if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { |
| ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " |
| "Checksum for group %u failed (%u!=%u)", |
| i, le16_to_cpu(ext4_group_desc_csum(sbi, i, |
| gdp)), le16_to_cpu(gdp->bg_checksum)); |
| if (!(sb->s_flags & MS_RDONLY)) { |
| ext4_unlock_group(sb, i); |
| return 0; |
| } |
| } |
| ext4_unlock_group(sb, i); |
| if (!flexbg_flag) |
| first_block += EXT4_BLOCKS_PER_GROUP(sb); |
| } |
| if (NULL != first_not_zeroed) |
| *first_not_zeroed = grp; |
| |
| ext4_free_blocks_count_set(sbi->s_es, |
| EXT4_C2B(sbi, ext4_count_free_clusters(sb))); |
| sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb)); |
| return 1; |
| } |
| |
| /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at |
| * the superblock) which were deleted from all directories, but held open by |
| * a process at the time of a crash. We walk the list and try to delete these |
| * inodes at recovery time (only with a read-write filesystem). |
| * |
| * In order to keep the orphan inode chain consistent during traversal (in |
| * case of crash during recovery), we link each inode into the superblock |
| * orphan list_head and handle it the same way as an inode deletion during |
| * normal operation (which journals the operations for us). |
| * |
| * We only do an iget() and an iput() on each inode, which is very safe if we |
| * accidentally point at an in-use or already deleted inode. The worst that |
| * can happen in this case is that we get a "bit already cleared" message from |
| * ext4_free_inode(). The only reason we would point at a wrong inode is if |
| * e2fsck was run on this filesystem, and it must have already done the orphan |
| * inode cleanup for us, so we can safely abort without any further action. |
| */ |
| static void ext4_orphan_cleanup(struct super_block *sb, |
| struct ext4_super_block *es) |
| { |
| unsigned int s_flags = sb->s_flags; |
| int nr_orphans = 0, nr_truncates = 0; |
| #ifdef CONFIG_QUOTA |
| int i; |
| #endif |
| if (!es->s_last_orphan) { |
| jbd_debug(4, "no orphan inodes to clean up\n"); |
| return; |
| } |
| |
| if (bdev_read_only(sb->s_bdev)) { |
| ext4_msg(sb, KERN_ERR, "write access " |
| "unavailable, skipping orphan cleanup"); |
| return; |
| } |
| |
| /* Check if feature set would not allow a r/w mount */ |
| if (!ext4_feature_set_ok(sb, 0)) { |
| ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to " |
| "unknown ROCOMPAT features"); |
| return; |
| } |
| |
| if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { |
| if (es->s_last_orphan) |
| jbd_debug(1, "Errors on filesystem, " |
| "clearing orphan list.\n"); |
| es->s_last_orphan = 0; |
| jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); |
| return; |
| } |
| |
| if (s_flags & MS_RDONLY) { |
| ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs"); |
| sb->s_flags &= ~MS_RDONLY; |
| } |
| #ifdef CONFIG_QUOTA |
| /* Needed for iput() to work correctly and not trash data */ |
| sb->s_flags |= MS_ACTIVE; |
| /* Turn on quotas so that they are updated correctly */ |
| for (i = 0; i < MAXQUOTAS; i++) { |
| if (EXT4_SB(sb)->s_qf_names[i]) { |
| int ret = ext4_quota_on_mount(sb, i); |
| if (ret < 0) |
| ext4_msg(sb, KERN_ERR, |
| "Cannot turn on journaled " |
| "quota: error %d", ret); |
| } |
| } |
| #endif |
| |
| while (es->s_last_orphan) { |
| struct inode *inode; |
| |
| inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); |
| if (IS_ERR(inode)) { |
| es->s_last_orphan = 0; |
| break; |
| } |
| |
| list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); |
| dquot_initialize(inode); |
| if (inode->i_nlink) { |
| ext4_msg(sb, KERN_DEBUG, |
| "%s: truncating inode %lu to %lld bytes", |
| __func__, inode->i_ino, inode->i_size); |
| jbd_debug(2, "truncating inode %lu to %lld bytes\n", |
| inode->i_ino, inode->i_size); |
| ext4_truncate(inode); |
| nr_truncates++; |
| } else { |
| ext4_msg(sb, KERN_DEBUG, |
| "%s: deleting unreferenced inode %lu", |
| __func__, inode->i_ino); |
| jbd_debug(2, "deleting unreferenced inode %lu\n", |
| inode->i_ino); |
| nr_orphans++; |
| } |
| iput(inode); /* The delete magic happens here! */ |
| } |
| |
| #define PLURAL(x) (x), ((x) == 1) ? "" : "s" |
| |
| if (nr_orphans) |
| ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted", |
| PLURAL(nr_orphans)); |
| if (nr_truncates) |
| ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up", |
| PLURAL(nr_truncates)); |
| #ifdef CONFIG_QUOTA |
| /* Turn quotas off */ |
| for (i = 0; i < MAXQUOTAS; i++) { |
| if (sb_dqopt(sb)->files[i]) |
| dquot_quota_off(sb, i); |
| } |
| #endif |
| sb->s_flags = s_flags; /* Restore MS_RDONLY status */ |
| } |
| |
| /* |
| * Maximal extent format file size. |
| * Resulting logical blkno at s_maxbytes must fit in our on-disk |
| * extent format containers, within a sector_t, and within i_blocks |
| * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, |
| * so that won't be a limiting factor. |
| * |
| * However there is other limiting factor. We do store extents in the form |
| * of starting block and length, hence the resulting length of the extent |
| * covering maximum file size must fit into on-disk format containers as |
| * well. Given that length is always by 1 unit bigger than max unit (because |
| * we count 0 as well) we have to lower the s_maxbytes by one fs block. |
| * |
| * Note, this does *not* consider any metadata overhead for vfs i_blocks. |
| */ |
| static loff_t ext4_max_size(int blkbits, int has_huge_files) |
| { |
| loff_t res; |
| loff_t upper_limit = MAX_LFS_FILESIZE; |
| |
| /* small i_blocks in vfs inode? */ |
| if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { |
| /* |
| * CONFIG_LBDAF is not enabled implies the inode |
| * i_block represent total blocks in 512 bytes |
| * 32 == size of vfs inode i_blocks * 8 |
| */ |
| upper_limit = (1LL << 32) - 1; |
| |
| /* total blocks in file system block size */ |
| upper_limit >>= (blkbits - 9); |
| upper_limit <<= blkbits; |
| } |
| |
| /* |
| * 32-bit extent-start container, ee_block. We lower the maxbytes |
| * by one fs block, so ee_len can cover the extent of maximum file |
| * size |
| */ |
| res = (1LL << 32) - 1; |
| res <<= blkbits; |
| |
| /* Sanity check against vm- & vfs- imposed limits */ |
| if (res > upper_limit) |
| res = upper_limit; |
| |
| return res; |
| } |
| |
| /* |
| * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect |
| * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. |
| * We need to be 1 filesystem block less than the 2^48 sector limit. |
| */ |
| static loff_t ext4_max_bitmap_size(int bits, int has_huge_files) |
| { |
| loff_t res = EXT4_NDIR_BLOCKS; |
| int meta_blocks; |
| loff_t upper_limit; |
| /* This is calculated to be the largest file size for a dense, block |
| * mapped file such that the file's total number of 512-byte sectors, |
| * including data and all indirect blocks, does not exceed (2^48 - 1). |
| * |
| * __u32 i_blocks_lo and _u16 i_blocks_high represent the total |
| * number of 512-byte sectors of the file. |
| */ |
| |
| if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { |
| /* |
| * !has_huge_files or CONFIG_LBDAF not enabled implies that |
| * the inode i_block field represents total file blocks in |
| * 2^32 512-byte sectors == size of vfs inode i_blocks * 8 |
| */ |
| upper_limit = (1LL << 32) - 1; |
| |
| /* total blocks in file system block size */ |
| upper_limit >>= (bits - 9); |
| |
| } else { |
| /* |
| * We use 48 bit ext4_inode i_blocks |
| * With EXT4_HUGE_FILE_FL set the i_blocks |
| * represent total number of blocks in |
| * file system block size |
| */ |
| upper_limit = (1LL << 48) - 1; |
| |
| } |
| |
| /* indirect blocks */ |
| meta_blocks = 1; |
| /* double indirect blocks */ |
| meta_blocks += 1 + (1LL << (bits-2)); |
| /* tripple indirect blocks */ |
| meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); |
| |
| upper_limit -= meta_blocks; |
| upper_limit <<= bits; |
| |
| res += 1LL << (bits-2); |
| res += 1LL << (2*(bits-2)); |
| res += 1LL << (3*(bits-2)); |
| res <<= bits; |
| if (res > upper_limit) |
| res = upper_limit; |
| |
| if (res > MAX_LFS_FILESIZE) |
| res = MAX_LFS_FILESIZE; |
| |
| return res; |
| } |
| |
| static ext4_fsblk_t descriptor_loc(struct super_block *sb, |
| ext4_fsblk_t logical_sb_block, int nr) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| ext4_group_t bg, first_meta_bg; |
| int has_super = 0; |
| |
| first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
| |
| if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || |
| nr < first_meta_bg) |
| return logical_sb_block + nr + 1; |
| bg = sbi->s_desc_per_block * nr; |
| if (ext4_bg_has_super(sb, bg)) |
| has_super = 1; |
| |
| return (has_super + ext4_group_first_block_no(sb, bg)); |
| } |
| |
| /** |
| * ext4_get_stripe_size: Get the stripe size. |
| * @sbi: In memory super block info |
| * |
| * If we have specified it via mount option, then |
| * use the mount option value. If the value specified at mount time is |
| * greater than the blocks per group use the super block value. |
| * If the super block value is greater than blocks per group return 0. |
| * Allocator needs it be less than blocks per group. |
| * |
| */ |
| static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) |
| { |
| unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); |
| unsigned long stripe_width = |
| le32_to_cpu(sbi->s_es->s_raid_stripe_width); |
| int ret; |
| |
| if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) |
| ret = sbi->s_stripe; |
| else if (stripe_width <= sbi->s_blocks_per_group) |
| ret = stripe_width; |
| else if (stride <= sbi->s_blocks_per_group) |
| ret = stride; |
| else |
| ret = 0; |
| |
| /* |
| * If the stripe width is 1, this makes no sense and |
| * we set it to 0 to turn off stripe handling code. |
| */ |
| if (ret <= 1) |
| ret = 0; |
| |
| return ret; |
| } |
| |
| /* sysfs supprt */ |
| |
| struct ext4_attr { |
| struct attribute attr; |
| ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *); |
| ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *, |
| const char *, size_t); |
| int offset; |
| }; |
| |
| static int parse_strtoul(const char *buf, |
| unsigned long max, unsigned long *value) |
| { |
| char *endp; |
| |
| *value = simple_strtoul(skip_spaces(buf), &endp, 0); |
| endp = skip_spaces(endp); |
| if (*endp || *value > max) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a, |
| struct ext4_sb_info *sbi, |
| char *buf) |
| { |
| return snprintf(buf, PAGE_SIZE, "%llu\n", |
| (s64) EXT4_C2B(sbi, |
| percpu_counter_sum(&sbi->s_dirtyclusters_counter))); |
| } |
| |
| static ssize_t session_write_kbytes_show(struct ext4_attr *a, |
| struct ext4_sb_info *sbi, char *buf) |
| { |
| struct super_block *sb = sbi->s_buddy_cache->i_sb; |
| |
| if (!sb->s_bdev->bd_part) |
| return snprintf(buf, PAGE_SIZE, "0\n"); |
| return snprintf(buf, PAGE_SIZE, "%lu\n", |
| (part_stat_read(sb->s_bdev->bd_part, sectors[1]) - |
| sbi->s_sectors_written_start) >> 1); |
| } |
| |
| static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a, |
| struct ext4_sb_info *sbi, char *buf) |
| { |
| struct super_block *sb = sbi->s_buddy_cache->i_sb; |
| |
| if (!sb->s_bdev->bd_part) |
| return snprintf(buf, PAGE_SIZE, "0\n"); |
| return snprintf(buf, PAGE_SIZE, "%llu\n", |
| (unsigned long long)(sbi->s_kbytes_written + |
| ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - |
| EXT4_SB(sb)->s_sectors_written_start) >> 1))); |
| } |
| |
| static ssize_t inode_readahead_blks_store(struct ext4_attr *a, |
| struct ext4_sb_info *sbi, |
| const char *buf, size_t count) |
| { |
| unsigned long t; |
| |
| if (parse_strtoul(buf, 0x40000000, &t)) |
| return -EINVAL; |
| |
| if (t && !is_power_of_2(t)) |
| return -EINVAL; |
| |
| sbi->s_inode_readahead_blks = t; |
| return count; |
| } |
| |
| static ssize_t sbi_ui_show(struct ext4_attr *a, |
| struct ext4_sb_info *sbi, char *buf) |
| { |
| unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); |
| |
| return snprintf(buf, PAGE_SIZE, "%u\n", *ui); |
| } |
| |
| static ssize_t sbi_ui_store(struct ext4_attr *a, |
| struct ext4_sb_info *sbi, |
| const char *buf, size_t count) |
| { |
| unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); |
| unsigned long t; |
| |
| if (parse_strtoul(buf, 0xffffffff, &t)) |
| return -EINVAL; |
| *ui = t; |
| return count; |
| } |
| |
| #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \ |
| static struct ext4_attr ext4_attr_##_name = { \ |
| .attr = {.name = __stringify(_name), .mode = _mode }, \ |
| .show = _show, \ |
| .store = _store, \ |
| .offset = offsetof(struct ext4_sb_info, _elname), \ |
| } |
| #define EXT4_ATTR(name, mode, show, store) \ |
| static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store) |
| |
| #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL) |
| #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL) |
| #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store) |
| #define EXT4_RW_ATTR_SBI_UI(name, elname) \ |
| EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname) |
| #define ATTR_LIST(name) &ext4_attr_##name.attr |
| |
| EXT4_RO_ATTR(delayed_allocation_blocks); |
| EXT4_RO_ATTR(session_write_kbytes); |
| EXT4_RO_ATTR(lifetime_write_kbytes); |
| EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show, |
| inode_readahead_blks_store, s_inode_readahead_blks); |
| EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal); |
| EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats); |
| EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan); |
| EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan); |
| EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs); |
| EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request); |
| EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc); |
| EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump); |
| |
| static struct attribute *ext4_attrs[] = { |
| ATTR_LIST(delayed_allocation_blocks), |
| ATTR_LIST(session_write_kbytes), |
| ATTR_LIST(lifetime_write_kbytes), |
| ATTR_LIST(inode_readahead_blks), |
| ATTR_LIST(inode_goal), |
| ATTR_LIST(mb_stats), |
| ATTR_LIST(mb_max_to_scan), |
| ATTR_LIST(mb_min_to_scan), |
| ATTR_LIST(mb_order2_req), |
| ATTR_LIST(mb_stream_req), |
| ATTR_LIST(mb_group_prealloc), |
| ATTR_LIST(max_writeback_mb_bump), |
| NULL, |
| }; |
| |
| /* Features this copy of ext4 supports */ |
| EXT4_INFO_ATTR(lazy_itable_init); |
| EXT4_INFO_ATTR(batched_discard); |
| |
| static struct attribute *ext4_feat_attrs[] = { |
| ATTR_LIST(lazy_itable_init), |
| ATTR_LIST(batched_discard), |
| NULL, |
| }; |
| |
| static ssize_t ext4_attr_show(struct kobject *kobj, |
| struct attribute *attr, char *buf) |
| { |
| struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, |
| s_kobj); |
| struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); |
| |
| return a->show ? a->show(a, sbi, buf) : 0; |
| } |
| |
| static ssize_t ext4_attr_store(struct kobject *kobj, |
| struct attribute *attr, |
| const char *buf, size_t len) |
| { |
| struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, |
| s_kobj); |
| struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); |
| |
| return a->store ? a->store(a, sbi, buf, len) : 0; |
| } |
| |
| static void ext4_sb_release(struct kobject *kobj) |
| { |
| struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, |
| s_kobj); |
| complete(&sbi->s_kobj_unregister); |
| } |
| |
| static const struct sysfs_ops ext4_attr_ops = { |
| .show = ext4_attr_show, |
| .store = ext4_attr_store, |
| }; |
| |
| static struct kobj_type ext4_ktype = { |
| .default_attrs = ext4_attrs, |
| .sysfs_ops = &ext4_attr_ops, |
| .release = ext4_sb_release, |
| }; |
| |
| static void ext4_feat_release(struct kobject *kobj) |
| { |
| complete(&ext4_feat->f_kobj_unregister); |
| } |
| |
| static struct kobj_type ext4_feat_ktype = { |
| .default_attrs = ext4_feat_attrs, |
| .sysfs_ops = &ext4_attr_ops, |
| .release = ext4_feat_release, |
| }; |
| |
| /* |
| * Check whether this filesystem can be mounted based on |
| * the features present and the RDONLY/RDWR mount requested. |
| * Returns 1 if this filesystem can be mounted as requested, |
| * 0 if it cannot be. |
| */ |
| static int ext4_feature_set_ok(struct super_block *sb, int readonly) |
| { |
| if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) { |
| ext4_msg(sb, KERN_ERR, |
| "Couldn't mount because of " |
| "unsupported optional features (%x)", |
| (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) & |
| ~EXT4_FEATURE_INCOMPAT_SUPP)); |
| return 0; |
| } |
| |
| if (readonly) |
| return 1; |
| |
| /* Check that feature set is OK for a read-write mount */ |
| if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) { |
| ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of " |
| "unsupported optional features (%x)", |
| (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) & |
| ~EXT4_FEATURE_RO_COMPAT_SUPP)); |
| return 0; |
| } |
| /* |
| * Large file size enabled file system can only be mounted |
| * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF |
| */ |
| if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { |
| if (sizeof(blkcnt_t) < sizeof(u64)) { |
| ext4_msg(sb, KERN_ERR, "Filesystem with huge files " |
| "cannot be mounted RDWR without " |
| "CONFIG_LBDAF"); |
| return 0; |
| } |
| } |
| if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) && |
| !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) { |
| ext4_msg(sb, KERN_ERR, |
| "Can't support bigalloc feature without " |
| "extents feature\n"); |
| return 0; |
| } |
| return 1; |
| } |
| |
| /* |
| * This function is called once a day if we have errors logged |
| * on the file system |
| */ |
| static void print_daily_error_info(unsigned long arg) |
| { |
| struct super_block *sb = (struct super_block *) arg; |
| struct ext4_sb_info *sbi; |
| struct ext4_super_block *es; |
| |
| sbi = EXT4_SB(sb); |
| es = sbi->s_es; |
| |
| if (es->s_error_count) |
| ext4_msg(sb, KERN_NOTICE, "error count: %u", |
| le32_to_cpu(es->s_error_count)); |
| if (es->s_first_error_time) { |
| printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d", |
| sb->s_id, le32_to_cpu(es->s_first_error_time), |
| (int) sizeof(es->s_first_error_func), |
| es->s_first_error_func, |
| le32_to_cpu(es->s_first_error_line)); |
| if (es->s_first_error_ino) |
| printk(": inode %u", |
| le32_to_cpu(es->s_first_error_ino)); |
| if (es->s_first_error_block) |
| printk(": block %llu", (unsigned long long) |
| le64_to_cpu(es->s_first_error_block)); |
| printk("\n"); |
| } |
| if (es->s_last_error_time) { |
| printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d", |
| sb->s_id, le32_to_cpu(es->s_last_error_time), |
| (int) sizeof(es->s_last_error_func), |
| es->s_last_error_func, |
| le32_to_cpu(es->s_last_error_line)); |
| if (es->s_last_error_ino) |
| printk(": inode %u", |
| le32_to_cpu(es->s_last_error_ino)); |
| if (es->s_last_error_block) |
| printk(": block %llu", (unsigned long long) |
| le64_to_cpu(es->s_last_error_block)); |
| printk("\n"); |
| } |
| mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */ |
| } |
| |
| /* Find next suitable group and run ext4_init_inode_table */ |
| static int ext4_run_li_request(struct ext4_li_request *elr) |
| { |
| struct ext4_group_desc *gdp = NULL; |
| ext4_group_t group, ngroups; |
| struct super_block *sb; |
| unsigned long timeout = 0; |
| int ret = 0; |
| |
| sb = elr->lr_super; |
| ngroups = EXT4_SB(sb)->s_groups_count; |
| |
| for (group = elr->lr_next_group; group < ngroups; group++) { |
| gdp = ext4_get_group_desc(sb, group, NULL); |
| if (!gdp) { |
| ret = 1; |
| break; |
| } |
| |
| if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) |
| break; |
| } |
| |
| if (group == ngroups) |
| ret = 1; |
| |
| if (!ret) { |
| timeout = jiffies; |
| ret = ext4_init_inode_table(sb, group, |
| elr->lr_timeout ? 0 : 1); |
| if (elr->lr_timeout == 0) { |
| timeout = (jiffies - timeout) * |
| elr->lr_sbi->s_li_wait_mult; |
| elr->lr_timeout = timeout; |
| } |
| elr->lr_next_sched = jiffies + elr->lr_timeout; |
| elr->lr_next_group = group + 1; |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * Remove lr_request from the list_request and free the |
| * request structure. Should be called with li_list_mtx held |
| */ |
| static void ext4_remove_li_request(struct ext4_li_request *elr) |
| { |
| struct ext4_sb_info *sbi; |
| |
| if (!elr) |
| return; |
| |
| sbi = elr->lr_sbi; |
| |
| list_del(&elr->lr_request); |
| sbi->s_li_request = NULL; |
| kfree(elr); |
| } |
| |
| static void ext4_unregister_li_request(struct super_block *sb) |
| { |
| mutex_lock(&ext4_li_mtx); |
| if (!ext4_li_info) { |
| mutex_unlock(&ext4_li_mtx); |
| return; |
| } |
| |
| mutex_lock(&ext4_li_info->li_list_mtx); |
| ext4_remove_li_request(EXT4_SB(sb)->s_li_request); |
| mutex_unlock(&ext4_li_info->li_list_mtx); |
| mutex_unlock(&ext4_li_mtx); |
| } |
| |
| static struct task_struct *ext4_lazyinit_task; |
| |
| /* |
| * This is the function where ext4lazyinit thread lives. It walks |
| * through the request list searching for next scheduled filesystem. |
| * When such a fs is found, run the lazy initialization request |
| * (ext4_rn_li_request) and keep track of the time spend in this |
| * function. Based on that time we compute next schedule time of |
| * the request. When walking through the list is complete, compute |
| * next waking time and put itself into sleep. |
| */ |
| static int ext4_lazyinit_thread(void *arg) |
| { |
| struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg; |
| struct list_head *pos, *n; |
| struct ext4_li_request *elr; |
| unsigned long next_wakeup, cur; |
| |
| BUG_ON(NULL == eli); |
| |
| cont_thread: |
| while (true) { |
| next_wakeup = MAX_JIFFY_OFFSET; |
| |
| mutex_lock(&eli->li_list_mtx); |
| if (list_empty(&eli->li_request_list)) { |
| mutex_unlock(&eli->li_list_mtx); |
| goto exit_thread; |
| } |
| |
| list_for_each_safe(pos, n, &eli->li_request_list) { |
| elr = list_entry(pos, struct ext4_li_request, |
| lr_request); |
| |
| if (time_after_eq(jiffies, elr->lr_next_sched)) { |
| if (ext4_run_li_request(elr) != 0) { |
| /* error, remove the lazy_init job */ |
| ext4_remove_li_request(elr); |
| continue; |
| } |
| } |
| |
| if (time_before(elr->lr_next_sched, next_wakeup)) |
| next_wakeup = elr->lr_next_sched; |
| } |
| mutex_unlock(&eli->li_list_mtx); |
| |
| if (freezing(current)) |
| refrigerator(); |
| |
| cur = jiffies; |
| if ((time_after_eq(cur, next_wakeup)) || |
| (MAX_JIFFY_OFFSET == next_wakeup)) { |
| cond_resched(); |
| continue; |
| } |
| |
| schedule_timeout_interruptible(next_wakeup - cur); |
| |
| if (kthread_should_stop()) { |
| ext4_clear_request_list(); |
| goto exit_thread; |
| } |
| } |
| |
| exit_thread: |
| /* |
| * It looks like the request list is empty, but we need |
| * to check it under the li_list_mtx lock, to prevent any |
| * additions into it, and of course we should lock ext4_li_mtx |
| * to atomically free the list and ext4_li_info, because at |
| * this point another ext4 filesystem could be registering |
| * new one. |
| */ |
| mutex_lock(&ext4_li_mtx); |
| mutex_lock(&eli->li_list_mtx); |
| if (!list_empty(&eli->li_request_list)) { |
| mutex_unlock(&eli->li_list_mtx); |
| mutex_unlock(&ext4_li_mtx); |
| goto cont_thread; |
| } |
| mutex_unlock(&eli->li_list_mtx); |
| kfree(ext4_li_info); |
| ext4_li_info = NULL; |
| mutex_unlock(&ext4_li_mtx); |
| |
| return 0; |
| } |
| |
| static void ext4_clear_request_list(void) |
| { |
| struct list_head *pos, *n; |
| struct ext4_li_request *elr; |
| |
| mutex_lock(&ext4_li_info->li_list_mtx); |
| list_for_each_safe(pos, n, &ext4_li_info->li_request_list) { |
| elr = list_entry(pos |