| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * 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/slab.h> |
| #include <linux/init.h> |
| #include <linux/blkdev.h> |
| #include <linux/backing-dev.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/ctype.h> |
| #include <linux/log2.h> |
| #include <linux/crc16.h> |
| #include <linux/dax.h> |
| #include <linux/cleancache.h> |
| #include <linux/uaccess.h> |
| #include <linux/iversion.h> |
| #include <linux/unicode.h> |
| #include <linux/part_stat.h> |
| #include <linux/kthread.h> |
| #include <linux/freezer.h> |
| |
| #include "ext4.h" |
| #include "ext4_extents.h" /* Needed for trace points definition */ |
| #include "ext4_jbd2.h" |
| #include "xattr.h" |
| #include "acl.h" |
| #include "mballoc.h" |
| #include "fsmap.h" |
| |
| #define CREATE_TRACE_POINTS |
| #include <trace/events/ext4.h> |
| |
| static struct ext4_lazy_init *ext4_li_info; |
| static struct mutex ext4_li_mtx; |
| static struct ratelimit_state ext4_mount_msg_ratelimit; |
| |
| static int ext4_load_journal(struct super_block *, struct ext4_super_block *, |
| unsigned long journal_devnum); |
| static int ext4_show_options(struct seq_file *seq, struct dentry *root); |
| 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 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 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); |
| static struct inode *ext4_get_journal_inode(struct super_block *sb, |
| unsigned int journal_inum); |
| |
| /* |
| * Lock ordering |
| * |
| * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and |
| * i_mmap_rwsem (inode->i_mmap_rwsem)! |
| * |
| * page fault path: |
| * mmap_lock -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start -> |
| * page lock -> i_data_sem (rw) |
| * |
| * buffered write path: |
| * sb_start_write -> i_mutex -> mmap_lock |
| * sb_start_write -> i_mutex -> transaction start -> page lock -> |
| * i_data_sem (rw) |
| * |
| * truncate: |
| * sb_start_write -> i_mutex -> i_mmap_sem (w) -> i_mmap_rwsem (w) -> page lock |
| * sb_start_write -> i_mutex -> i_mmap_sem (w) -> transaction start -> |
| * i_data_sem (rw) |
| * |
| * direct IO: |
| * sb_start_write -> i_mutex -> mmap_lock |
| * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw) |
| * |
| * writepages: |
| * transaction start -> page lock(s) -> i_data_sem (rw) |
| */ |
| |
| #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2) |
| 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, |
| }; |
| MODULE_ALIAS_FS("ext2"); |
| MODULE_ALIAS("ext2"); |
| #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type) |
| #else |
| #define IS_EXT2_SB(sb) (0) |
| #endif |
| |
| |
| 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, |
| }; |
| MODULE_ALIAS_FS("ext3"); |
| MODULE_ALIAS("ext3"); |
| #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type) |
| |
| /* |
| * This works like sb_bread() except it uses ERR_PTR for error |
| * returns. Currently with sb_bread it's impossible to distinguish |
| * between ENOMEM and EIO situations (since both result in a NULL |
| * return. |
| */ |
| struct buffer_head * |
| ext4_sb_bread(struct super_block *sb, sector_t block, int op_flags) |
| { |
| struct buffer_head *bh = sb_getblk(sb, block); |
| |
| if (bh == NULL) |
| return ERR_PTR(-ENOMEM); |
| if (ext4_buffer_uptodate(bh)) |
| return bh; |
| ll_rw_block(REQ_OP_READ, REQ_META | op_flags, 1, &bh); |
| wait_on_buffer(bh); |
| if (buffer_uptodate(bh)) |
| return bh; |
| put_bh(bh); |
| return ERR_PTR(-EIO); |
| } |
| |
| static int ext4_verify_csum_type(struct super_block *sb, |
| struct ext4_super_block *es) |
| { |
| if (!ext4_has_feature_metadata_csum(sb)) |
| return 1; |
| |
| return es->s_checksum_type == EXT4_CRC32C_CHKSUM; |
| } |
| |
| static __le32 ext4_superblock_csum(struct super_block *sb, |
| struct ext4_super_block *es) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| int offset = offsetof(struct ext4_super_block, s_checksum); |
| __u32 csum; |
| |
| csum = ext4_chksum(sbi, ~0, (char *)es, offset); |
| |
| return cpu_to_le32(csum); |
| } |
| |
| static int ext4_superblock_csum_verify(struct super_block *sb, |
| struct ext4_super_block *es) |
| { |
| if (!ext4_has_metadata_csum(sb)) |
| return 1; |
| |
| return es->s_checksum == ext4_superblock_csum(sb, es); |
| } |
| |
| void ext4_superblock_csum_set(struct super_block *sb) |
| { |
| struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
| |
| if (!ext4_has_metadata_csum(sb)) |
| return; |
| |
| es->s_checksum = ext4_superblock_csum(sb, es); |
| } |
| |
| 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); |
| } |
| |
| static void __ext4_update_tstamp(__le32 *lo, __u8 *hi) |
| { |
| time64_t now = ktime_get_real_seconds(); |
| |
| now = clamp_val(now, 0, (1ull << 40) - 1); |
| |
| *lo = cpu_to_le32(lower_32_bits(now)); |
| *hi = upper_32_bits(now); |
| } |
| |
| static time64_t __ext4_get_tstamp(__le32 *lo, __u8 *hi) |
| { |
| return ((time64_t)(*hi) << 32) + le32_to_cpu(*lo); |
| } |
| #define ext4_update_tstamp(es, tstamp) \ |
| __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi) |
| #define ext4_get_tstamp(es, tstamp) \ |
| __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi) |
| |
| static void __save_error_info(struct super_block *sb, int error, |
| __u32 ino, __u64 block, |
| const char *func, unsigned int line) |
| { |
| struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
| int err; |
| |
| EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
| if (bdev_read_only(sb->s_bdev)) |
| return; |
| es->s_state |= cpu_to_le16(EXT4_ERROR_FS); |
| ext4_update_tstamp(es, s_last_error_time); |
| strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func)); |
| es->s_last_error_line = cpu_to_le32(line); |
| es->s_last_error_ino = cpu_to_le32(ino); |
| es->s_last_error_block = cpu_to_le64(block); |
| switch (error) { |
| case EIO: |
| err = EXT4_ERR_EIO; |
| break; |
| case ENOMEM: |
| err = EXT4_ERR_ENOMEM; |
| break; |
| case EFSBADCRC: |
| err = EXT4_ERR_EFSBADCRC; |
| break; |
| case 0: |
| case EFSCORRUPTED: |
| err = EXT4_ERR_EFSCORRUPTED; |
| break; |
| case ENOSPC: |
| err = EXT4_ERR_ENOSPC; |
| break; |
| case ENOKEY: |
| err = EXT4_ERR_ENOKEY; |
| break; |
| case EROFS: |
| err = EXT4_ERR_EROFS; |
| break; |
| case EFBIG: |
| err = EXT4_ERR_EFBIG; |
| break; |
| case EEXIST: |
| err = EXT4_ERR_EEXIST; |
| break; |
| case ERANGE: |
| err = EXT4_ERR_ERANGE; |
| break; |
| case EOVERFLOW: |
| err = EXT4_ERR_EOVERFLOW; |
| break; |
| case EBUSY: |
| err = EXT4_ERR_EBUSY; |
| break; |
| case ENOTDIR: |
| err = EXT4_ERR_ENOTDIR; |
| break; |
| case ENOTEMPTY: |
| err = EXT4_ERR_ENOTEMPTY; |
| break; |
| case ESHUTDOWN: |
| err = EXT4_ERR_ESHUTDOWN; |
| break; |
| case EFAULT: |
| err = EXT4_ERR_EFAULT; |
| break; |
| default: |
| err = EXT4_ERR_UNKNOWN; |
| } |
| es->s_last_error_errcode = err; |
| if (!es->s_first_error_time) { |
| es->s_first_error_time = es->s_last_error_time; |
| es->s_first_error_time_hi = es->s_last_error_time_hi; |
| 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; |
| es->s_first_error_errcode = es->s_last_error_errcode; |
| } |
| /* |
| * 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); |
| le32_add_cpu(&es->s_error_count, 1); |
| } |
| |
| static void save_error_info(struct super_block *sb, int error, |
| __u32 ino, __u64 block, |
| const char *func, unsigned int line) |
| { |
| __save_error_info(sb, error, ino, block, func, line); |
| if (!bdev_read_only(sb->s_bdev)) |
| 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 = inode_to_bdi(bd_inode); |
| |
| return bdi->dev == NULL; |
| } |
| |
| static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn) |
| { |
| struct super_block *sb = journal->j_private; |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| int error = is_journal_aborted(journal); |
| struct ext4_journal_cb_entry *jce; |
| |
| BUG_ON(txn->t_state == T_FINISHED); |
| |
| ext4_process_freed_data(sb, txn->t_tid); |
| |
| spin_lock(&sbi->s_md_lock); |
| while (!list_empty(&txn->t_private_list)) { |
| jce = list_entry(txn->t_private_list.next, |
| struct ext4_journal_cb_entry, jce_list); |
| list_del_init(&jce->jce_list); |
| spin_unlock(&sbi->s_md_lock); |
| jce->jce_func(sb, jce, error); |
| spin_lock(&sbi->s_md_lock); |
| } |
| spin_unlock(&sbi->s_md_lock); |
| } |
| |
| static bool system_going_down(void) |
| { |
| return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF |
| || system_state == SYSTEM_RESTART; |
| } |
| |
| /* 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 (test_opt(sb, WARN_ON_ERROR)) |
| WARN_ON_ONCE(1); |
| |
| if (sb_rdonly(sb)) |
| 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); |
| } |
| /* |
| * We force ERRORS_RO behavior when system is rebooting. Otherwise we |
| * could panic during 'reboot -f' as the underlying device got already |
| * disabled. |
| */ |
| if (test_opt(sb, ERRORS_RO) || system_going_down()) { |
| ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); |
| /* |
| * Make sure updated value of ->s_mount_flags will be visible |
| * before ->s_flags update |
| */ |
| smp_wmb(); |
| sb->s_flags |= SB_RDONLY; |
| } else if (test_opt(sb, ERRORS_PANIC)) { |
| if (EXT4_SB(sb)->s_journal && |
| !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR)) |
| return; |
| panic("EXT4-fs (device %s): panic forced after error\n", |
| sb->s_id); |
| } |
| } |
| |
| #define ext4_error_ratelimit(sb) \ |
| ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \ |
| "EXT4-fs error") |
| |
| void __ext4_error(struct super_block *sb, const char *function, |
| unsigned int line, int error, __u64 block, |
| const char *fmt, ...) |
| { |
| struct va_format vaf; |
| va_list args; |
| |
| if (unlikely(ext4_forced_shutdown(EXT4_SB(sb)))) |
| return; |
| |
| trace_ext4_error(sb, function, line); |
| if (ext4_error_ratelimit(sb)) { |
| 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, error, 0, block, function, line); |
| ext4_handle_error(sb); |
| } |
| |
| void __ext4_error_inode(struct inode *inode, const char *function, |
| unsigned int line, ext4_fsblk_t block, int error, |
| const char *fmt, ...) |
| { |
| va_list args; |
| struct va_format vaf; |
| |
| if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
| return; |
| |
| trace_ext4_error(inode->i_sb, function, line); |
| if (ext4_error_ratelimit(inode->i_sb)) { |
| va_start(args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| if (block) |
| printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " |
| "inode #%lu: block %llu: comm %s: %pV\n", |
| inode->i_sb->s_id, function, line, inode->i_ino, |
| block, current->comm, &vaf); |
| else |
| printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " |
| "inode #%lu: comm %s: %pV\n", |
| inode->i_sb->s_id, function, line, inode->i_ino, |
| current->comm, &vaf); |
| va_end(args); |
| } |
| save_error_info(inode->i_sb, error, inode->i_ino, block, |
| function, line); |
| 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 inode *inode = file_inode(file); |
| char pathname[80], *path; |
| |
| if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
| return; |
| |
| trace_ext4_error(inode->i_sb, function, line); |
| if (ext4_error_ratelimit(inode->i_sb)) { |
| path = file_path(file, pathname, sizeof(pathname)); |
| if (IS_ERR(path)) |
| path = "(unknown)"; |
| va_start(args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| if (block) |
| printk(KERN_CRIT |
| "EXT4-fs error (device %s): %s:%d: inode #%lu: " |
| "block %llu: comm %s: path %s: %pV\n", |
| inode->i_sb->s_id, function, line, inode->i_ino, |
| block, current->comm, path, &vaf); |
| else |
| printk(KERN_CRIT |
| "EXT4-fs error (device %s): %s:%d: inode #%lu: " |
| "comm %s: path %s: %pV\n", |
| inode->i_sb->s_id, function, line, inode->i_ino, |
| current->comm, path, &vaf); |
| va_end(args); |
| } |
| save_error_info(inode->i_sb, EFSCORRUPTED, inode->i_ino, block, |
| function, line); |
| ext4_handle_error(inode->i_sb); |
| } |
| |
| const char *ext4_decode_error(struct super_block *sb, int errno, |
| char nbuf[16]) |
| { |
| char *errstr = NULL; |
| |
| switch (errno) { |
| case -EFSCORRUPTED: |
| errstr = "Corrupt filesystem"; |
| break; |
| case -EFSBADCRC: |
| errstr = "Filesystem failed CRC"; |
| break; |
| 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; |
| |
| if (unlikely(ext4_forced_shutdown(EXT4_SB(sb)))) |
| return; |
| |
| /* 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_rdonly(sb)) |
| return; |
| |
| if (ext4_error_ratelimit(sb)) { |
| 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, -errno, 0, 0, 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, int error, const char *fmt, ...) |
| { |
| struct va_format vaf; |
| va_list args; |
| |
| if (unlikely(ext4_forced_shutdown(EXT4_SB(sb)))) |
| return; |
| |
| save_error_info(sb, error, 0, 0, function, line); |
| va_start(args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n", |
| sb->s_id, function, line, &vaf); |
| va_end(args); |
| |
| if (sb_rdonly(sb) == 0) { |
| ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); |
| EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; |
| /* |
| * Make sure updated value of ->s_mount_flags will be visible |
| * before ->s_flags update |
| */ |
| smp_wmb(); |
| sb->s_flags |= SB_RDONLY; |
| if (EXT4_SB(sb)->s_journal) |
| jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); |
| } |
| if (test_opt(sb, ERRORS_PANIC) && !system_going_down()) { |
| if (EXT4_SB(sb)->s_journal && |
| !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR)) |
| return; |
| 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; |
| |
| if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs")) |
| return; |
| |
| va_start(args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf); |
| va_end(args); |
| } |
| |
| #define ext4_warning_ratelimit(sb) \ |
| ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \ |
| "EXT4-fs warning") |
| |
| void __ext4_warning(struct super_block *sb, const char *function, |
| unsigned int line, const char *fmt, ...) |
| { |
| struct va_format vaf; |
| va_list args; |
| |
| if (!ext4_warning_ratelimit(sb)) |
| return; |
| |
| 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_warning_inode(const struct inode *inode, const char *function, |
| unsigned int line, const char *fmt, ...) |
| { |
| struct va_format vaf; |
| va_list args; |
| |
| if (!ext4_warning_ratelimit(inode->i_sb)) |
| return; |
| |
| va_start(args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: " |
| "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id, |
| function, line, inode->i_ino, current->comm, &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; |
| |
| if (unlikely(ext4_forced_shutdown(EXT4_SB(sb)))) |
| return; |
| |
| trace_ext4_error(sb, function, line); |
| __save_error_info(sb, EFSCORRUPTED, ino, block, function, line); |
| |
| if (ext4_error_ratelimit(sb)) { |
| 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, WARN_ON_ERROR)) |
| WARN_ON_ONCE(1); |
| |
| if (test_opt(sb, ERRORS_CONT)) { |
| ext4_commit_super(sb, 0); |
| return; |
| } |
| |
| ext4_unlock_group(sb, grp); |
| ext4_commit_super(sb, 1); |
| 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_mark_group_bitmap_corrupted(struct super_block *sb, |
| ext4_group_t group, |
| unsigned int flags) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_group_info *grp = ext4_get_group_info(sb, group); |
| struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL); |
| int ret; |
| |
| if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) { |
| ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, |
| &grp->bb_state); |
| if (!ret) |
| percpu_counter_sub(&sbi->s_freeclusters_counter, |
| grp->bb_free); |
| } |
| |
| if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) { |
| ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, |
| &grp->bb_state); |
| if (!ret && gdp) { |
| int count; |
| |
| count = ext4_free_inodes_count(sb, gdp); |
| percpu_counter_sub(&sbi->s_freeinodes_counter, |
| count); |
| } |
| } |
| } |
| |
| 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; |
| |
| 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 unknown-block(%u,%u) %ld", |
| MAJOR(dev), MINOR(dev), PTR_ERR(bdev)); |
| return NULL; |
| } |
| |
| /* |
| * Release the journal device |
| */ |
| static void ext4_blkdev_put(struct block_device *bdev) |
| { |
| blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
| } |
| |
| static void ext4_blkdev_remove(struct ext4_sb_info *sbi) |
| { |
| struct block_device *bdev; |
| bdev = sbi->journal_bdev; |
| if (bdev) { |
| ext4_blkdev_put(bdev); |
| sbi->journal_bdev = NULL; |
| } |
| } |
| |
| 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)); |
| } |
| } |
| |
| #ifdef CONFIG_QUOTA |
| static int ext4_quota_off(struct super_block *sb, int type); |
| |
| static inline void ext4_quota_off_umount(struct super_block *sb) |
| { |
| int type; |
| |
| /* Use our quota_off function to clear inode flags etc. */ |
| for (type = 0; type < EXT4_MAXQUOTAS; type++) |
| ext4_quota_off(sb, type); |
| } |
| |
| /* |
| * This is a helper function which is used in the mount/remount |
| * codepaths (which holds s_umount) to fetch the quota file name. |
| */ |
| static inline char *get_qf_name(struct super_block *sb, |
| struct ext4_sb_info *sbi, |
| int type) |
| { |
| return rcu_dereference_protected(sbi->s_qf_names[type], |
| lockdep_is_held(&sb->s_umount)); |
| } |
| #else |
| static inline void ext4_quota_off_umount(struct super_block *sb) |
| { |
| } |
| #endif |
| |
| 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; |
| struct buffer_head **group_desc; |
| struct flex_groups **flex_groups; |
| int aborted = 0; |
| int i, err; |
| |
| ext4_unregister_li_request(sb); |
| ext4_quota_off_umount(sb); |
| |
| destroy_workqueue(sbi->rsv_conversion_wq); |
| |
| /* |
| * Unregister sysfs before destroying jbd2 journal. |
| * Since we could still access attr_journal_task attribute via sysfs |
| * path which could have sbi->s_journal->j_task as NULL |
| */ |
| ext4_unregister_sysfs(sb); |
| |
| if (sbi->s_journal) { |
| aborted = is_journal_aborted(sbi->s_journal); |
| err = jbd2_journal_destroy(sbi->s_journal); |
| sbi->s_journal = NULL; |
| if ((err < 0) && !aborted) { |
| ext4_abort(sb, -err, "Couldn't clean up the journal"); |
| } |
| } |
| |
| ext4_es_unregister_shrinker(sbi); |
| del_timer_sync(&sbi->s_err_report); |
| ext4_release_system_zone(sb); |
| ext4_mb_release(sb); |
| ext4_ext_release(sb); |
| |
| if (!sb_rdonly(sb) && !aborted) { |
| ext4_clear_feature_journal_needs_recovery(sb); |
| es->s_state = cpu_to_le16(sbi->s_mount_state); |
| } |
| if (!sb_rdonly(sb)) |
| ext4_commit_super(sb, 1); |
| |
| rcu_read_lock(); |
| group_desc = rcu_dereference(sbi->s_group_desc); |
| for (i = 0; i < sbi->s_gdb_count; i++) |
| brelse(group_desc[i]); |
| kvfree(group_desc); |
| flex_groups = rcu_dereference(sbi->s_flex_groups); |
| if (flex_groups) { |
| for (i = 0; i < sbi->s_flex_groups_allocated; i++) |
| kvfree(flex_groups[i]); |
| kvfree(flex_groups); |
| } |
| rcu_read_unlock(); |
| 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); |
| percpu_free_rwsem(&sbi->s_writepages_rwsem); |
| #ifdef CONFIG_QUOTA |
| for (i = 0; i < EXT4_MAXQUOTAS; i++) |
| kfree(get_qf_name(sb, sbi, 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)); |
| |
| sync_blockdev(sb->s_bdev); |
| 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); |
| } |
| |
| ext4_xattr_destroy_cache(sbi->s_ea_inode_cache); |
| sbi->s_ea_inode_cache = NULL; |
| |
| ext4_xattr_destroy_cache(sbi->s_ea_block_cache); |
| sbi->s_ea_block_cache = NULL; |
| |
| if (sbi->s_mmp_tsk) |
| kthread_stop(sbi->s_mmp_tsk); |
| brelse(sbi->s_sbh); |
| sb->s_fs_info = NULL; |
| /* |
| * Now that we are completely done shutting down the |
| * superblock, we need to actually destroy the kobject. |
| */ |
| kobject_put(&sbi->s_kobj); |
| wait_for_completion(&sbi->s_kobj_unregister); |
| if (sbi->s_chksum_driver) |
| crypto_free_shash(sbi->s_chksum_driver); |
| kfree(sbi->s_blockgroup_lock); |
| fs_put_dax(sbi->s_daxdev); |
| fscrypt_free_dummy_context(&sbi->s_dummy_enc_ctx); |
| #ifdef CONFIG_UNICODE |
| utf8_unload(sbi->s_encoding); |
| #endif |
| 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; |
| |
| inode_set_iversion(&ei->vfs_inode, 1); |
| spin_lock_init(&ei->i_raw_lock); |
| INIT_LIST_HEAD(&ei->i_prealloc_list); |
| spin_lock_init(&ei->i_prealloc_lock); |
| ext4_es_init_tree(&ei->i_es_tree); |
| rwlock_init(&ei->i_es_lock); |
| INIT_LIST_HEAD(&ei->i_es_list); |
| ei->i_es_all_nr = 0; |
| ei->i_es_shk_nr = 0; |
| ei->i_es_shrink_lblk = 0; |
| ei->i_reserved_data_blocks = 0; |
| spin_lock_init(&(ei->i_block_reservation_lock)); |
| ext4_init_pending_tree(&ei->i_pending_tree); |
| #ifdef CONFIG_QUOTA |
| ei->i_reserved_quota = 0; |
| memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); |
| #endif |
| ei->jinode = NULL; |
| INIT_LIST_HEAD(&ei->i_rsv_conversion_list); |
| spin_lock_init(&ei->i_completed_io_lock); |
| ei->i_sync_tid = 0; |
| ei->i_datasync_tid = 0; |
| atomic_set(&ei->i_unwritten, 0); |
| INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work); |
| return &ei->vfs_inode; |
| } |
| |
| static int ext4_drop_inode(struct inode *inode) |
| { |
| int drop = generic_drop_inode(inode); |
| |
| if (!drop) |
| drop = fscrypt_drop_inode(inode); |
| |
| trace_ext4_drop_inode(inode, drop); |
| return drop; |
| } |
| |
| static void ext4_free_in_core_inode(struct inode *inode) |
| { |
| fscrypt_free_inode(inode); |
| 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(); |
| } |
| } |
| |
| static void init_once(void *foo) |
| { |
| struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; |
| |
| INIT_LIST_HEAD(&ei->i_orphan); |
| init_rwsem(&ei->xattr_sem); |
| init_rwsem(&ei->i_data_sem); |
| init_rwsem(&ei->i_mmap_sem); |
| inode_init_once(&ei->vfs_inode); |
| } |
| |
| static int __init init_inodecache(void) |
| { |
| ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache", |
| sizeof(struct ext4_inode_info), 0, |
| (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| |
| SLAB_ACCOUNT), |
| offsetof(struct ext4_inode_info, i_data), |
| sizeof_field(struct ext4_inode_info, i_data), |
| init_once); |
| if (ext4_inode_cachep == NULL) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| static void destroy_inodecache(void) |
| { |
| /* |
| * Make sure all delayed rcu free inodes are flushed before we |
| * destroy cache. |
| */ |
| rcu_barrier(); |
| kmem_cache_destroy(ext4_inode_cachep); |
| } |
| |
| void ext4_clear_inode(struct inode *inode) |
| { |
| invalidate_inode_buffers(inode); |
| clear_inode(inode); |
| ext4_discard_preallocations(inode); |
| ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS); |
| dquot_drop(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; |
| } |
| fscrypt_put_encryption_info(inode); |
| fsverity_cleanup_inode(inode); |
| } |
| |
| static struct inode *ext4_nfs_get_inode(struct super_block *sb, |
| u64 ino, u32 generation) |
| { |
| struct inode *inode; |
| |
| /* |
| * Currently we don't know the generation for parent directory, so |
| * a generation of 0 means "accept any" |
| */ |
| inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE); |
| 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); |
| } |
| |
| static int ext4_nfs_commit_metadata(struct inode *inode) |
| { |
| struct writeback_control wbc = { |
| .sync_mode = WB_SYNC_ALL |
| }; |
| |
| trace_ext4_nfs_commit_metadata(inode); |
| return ext4_write_inode(inode, &wbc); |
| } |
| |
| /* |
| * 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_DIRECT_RECLAIM); |
| return try_to_free_buffers(page); |
| } |
| |
| #ifdef CONFIG_FS_ENCRYPTION |
| static int ext4_get_context(struct inode *inode, void *ctx, size_t len) |
| { |
| return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION, |
| EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len); |
| } |
| |
| static int ext4_set_context(struct inode *inode, const void *ctx, size_t len, |
| void *fs_data) |
| { |
| handle_t *handle = fs_data; |
| int res, res2, credits, retries = 0; |
| |
| /* |
| * Encrypting the root directory is not allowed because e2fsck expects |
| * lost+found to exist and be unencrypted, and encrypting the root |
| * directory would imply encrypting the lost+found directory as well as |
| * the filename "lost+found" itself. |
| */ |
| if (inode->i_ino == EXT4_ROOT_INO) |
| return -EPERM; |
| |
| if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode))) |
| return -EINVAL; |
| |
| res = ext4_convert_inline_data(inode); |
| if (res) |
| return res; |
| |
| /* |
| * If a journal handle was specified, then the encryption context is |
| * being set on a new inode via inheritance and is part of a larger |
| * transaction to create the inode. Otherwise the encryption context is |
| * being set on an existing inode in its own transaction. Only in the |
| * latter case should the "retry on ENOSPC" logic be used. |
| */ |
| |
| if (handle) { |
| res = ext4_xattr_set_handle(handle, inode, |
| EXT4_XATTR_INDEX_ENCRYPTION, |
| EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, |
| ctx, len, 0); |
| if (!res) { |
| ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT); |
| ext4_clear_inode_state(inode, |
| EXT4_STATE_MAY_INLINE_DATA); |
| /* |
| * Update inode->i_flags - S_ENCRYPTED will be enabled, |
| * S_DAX may be disabled |
| */ |
| ext4_set_inode_flags(inode); |
| } |
| return res; |
| } |
| |
| res = dquot_initialize(inode); |
| if (res) |
| return res; |
| retry: |
| res = ext4_xattr_set_credits(inode, len, false /* is_create */, |
| &credits); |
| if (res) |
| return res; |
| |
| handle = ext4_journal_start(inode, EXT4_HT_MISC, credits); |
| if (IS_ERR(handle)) |
| return PTR_ERR(handle); |
| |
| res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION, |
| EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, |
| ctx, len, 0); |
| if (!res) { |
| ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT); |
| /* |
| * Update inode->i_flags - S_ENCRYPTED will be enabled, |
| * S_DAX may be disabled |
| */ |
| ext4_set_inode_flags(inode); |
| res = ext4_mark_inode_dirty(handle, inode); |
| if (res) |
| EXT4_ERROR_INODE(inode, "Failed to mark inode dirty"); |
| } |
| res2 = ext4_journal_stop(handle); |
| |
| if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) |
| goto retry; |
| if (!res) |
| res = res2; |
| return res; |
| } |
| |
| static const union fscrypt_context * |
| ext4_get_dummy_context(struct super_block *sb) |
| { |
| return EXT4_SB(sb)->s_dummy_enc_ctx.ctx; |
| } |
| |
| static bool ext4_has_stable_inodes(struct super_block *sb) |
| { |
| return ext4_has_feature_stable_inodes(sb); |
| } |
| |
| static void ext4_get_ino_and_lblk_bits(struct super_block *sb, |
| int *ino_bits_ret, int *lblk_bits_ret) |
| { |
| *ino_bits_ret = 8 * sizeof(EXT4_SB(sb)->s_es->s_inodes_count); |
| *lblk_bits_ret = 8 * sizeof(ext4_lblk_t); |
| } |
| |
| static const struct fscrypt_operations ext4_cryptops = { |
| .key_prefix = "ext4:", |
| .get_context = ext4_get_context, |
| .set_context = ext4_set_context, |
| .get_dummy_context = ext4_get_dummy_context, |
| .empty_dir = ext4_empty_dir, |
| .max_namelen = EXT4_NAME_LEN, |
| .has_stable_inodes = ext4_has_stable_inodes, |
| .get_ino_and_lblk_bits = ext4_get_ino_and_lblk_bits, |
| }; |
| #endif |
| |
| #ifdef CONFIG_QUOTA |
| static const char * const quotatypes[] = INITQFNAMES; |
| #define QTYPE2NAME(t) (quotatypes[t]) |
| |
| 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, |
| const struct path *path); |
| 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 int ext4_quota_enable(struct super_block *sb, int type, int format_id, |
| unsigned int flags); |
| static int ext4_enable_quotas(struct super_block *sb); |
| |
| static struct dquot **ext4_get_dquots(struct inode *inode) |
| { |
| return EXT4_I(inode)->i_dquot; |
| } |
| |
| 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, |
| .get_projid = ext4_get_projid, |
| .get_inode_usage = ext4_get_inode_usage, |
| .get_next_id = dquot_get_next_id, |
| }; |
| |
| static const struct quotactl_ops ext4_qctl_operations = { |
| .quota_on = ext4_quota_on, |
| .quota_off = ext4_quota_off, |
| .quota_sync = dquot_quota_sync, |
| .get_state = dquot_get_state, |
| .set_info = dquot_set_dqinfo, |
| .get_dqblk = dquot_get_dqblk, |
| .set_dqblk = dquot_set_dqblk, |
| .get_nextdqblk = dquot_get_next_dqblk, |
| }; |
| #endif |
| |
| static const struct super_operations ext4_sops = { |
| .alloc_inode = ext4_alloc_inode, |
| .free_inode = ext4_free_in_core_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, |
| .get_dquots = ext4_get_dquots, |
| #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, |
| .commit_metadata = ext4_nfs_commit_metadata, |
| }; |
| |
| 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_removed, |
| Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, |
| Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, |
| Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev, |
| Opt_journal_path, 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_test_dummy_encryption, |
| Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, |
| Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, |
| Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err, |
| Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax, |
| Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error, |
| Opt_nowarn_on_error, Opt_mblk_io_submit, |
| Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize, |
| 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_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache, |
| }; |
| |
| 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_removed, "oldalloc"}, |
| {Opt_removed, "orlov"}, |
| {Opt_user_xattr, "user_xattr"}, |
| {Opt_nouser_xattr, "nouser_xattr"}, |
| {Opt_acl, "acl"}, |
| {Opt_noacl, "noacl"}, |
| {Opt_noload, "norecovery"}, |
| {Opt_noload, "noload"}, |
| {Opt_removed, "nobh"}, |
| {Opt_removed, "bh"}, |
| {Opt_commit, "commit=%u"}, |
| {Opt_min_batch_time, "min_batch_time=%u"}, |
| {Opt_max_batch_time, "max_batch_time=%u"}, |
| {Opt_journal_dev, "journal_dev=%u"}, |
| {Opt_journal_path, "journal_path=%s"}, |
| {Opt_journal_checksum, "journal_checksum"}, |
| {Opt_nojournal_checksum, "nojournal_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_prjquota, "prjquota"}, |
| {Opt_barrier, "barrier=%u"}, |
| {Opt_barrier, "barrier"}, |
| {Opt_nobarrier, "nobarrier"}, |
| {Opt_i_version, "i_version"}, |
| {Opt_dax, "dax"}, |
| {Opt_stripe, "stripe=%u"}, |
| {Opt_delalloc, "delalloc"}, |
| {Opt_warn_on_error, "warn_on_error"}, |
| {Opt_nowarn_on_error, "nowarn_on_error"}, |
| {Opt_lazytime, "lazytime"}, |
| {Opt_nolazytime, "nolazytime"}, |
| {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"}, |
| {Opt_nodelalloc, "nodelalloc"}, |
| {Opt_removed, "mblk_io_submit"}, |
| {Opt_removed, "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, "nodioread_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_max_dir_size_kb, "max_dir_size_kb=%u"}, |
| {Opt_test_dummy_encryption, "test_dummy_encryption=%s"}, |
| {Opt_test_dummy_encryption, "test_dummy_encryption"}, |
| {Opt_nombcache, "nombcache"}, |
| {Opt_nombcache, "no_mbcache"}, /* for backward compatibility */ |
| {Opt_removed, "check=none"}, /* mount option from ext2/3 */ |
| {Opt_removed, "nocheck"}, /* mount option from ext2/3 */ |
| {Opt_removed, "reservation"}, /* mount option from ext2/3 */ |
| {Opt_removed, "noreservation"}, /* mount option from ext2/3 */ |
| {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */ |
| {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 const 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, *old_qname = get_qf_name(sb, sbi, qtype); |
| int ret = -1; |
| |
| if (sb_any_quota_loaded(sb) && !old_qname) { |
| ext4_msg(sb, KERN_ERR, |
| "Cannot change journaled " |
| "quota options when quota turned on"); |
| return -1; |
| } |
| if (ext4_has_feature_quota(sb)) { |
| ext4_msg(sb, KERN_INFO, "Journaled quota options " |
| "ignored when QUOTA feature is enabled"); |
| return 1; |
| } |
| qname = match_strdup(args); |
| if (!qname) { |
| ext4_msg(sb, KERN_ERR, |
| "Not enough memory for storing quotafile name"); |
| return -1; |
| } |
| if (old_qname) { |
| if (strcmp(old_qname, qname) == 0) |
| ret = 1; |
| else |
| ext4_msg(sb, KERN_ERR, |
| "%s quota file already specified", |
| QTYPE2NAME(qtype)); |
| goto errout; |
| } |
| if (strchr(qname, '/')) { |
| ext4_msg(sb, KERN_ERR, |
| "quotafile must be on filesystem root"); |
| goto errout; |
| } |
| rcu_assign_pointer(sbi->s_qf_names[qtype], qname); |
| set_opt(sb, QUOTA); |
| return 1; |
| errout: |
| kfree(qname); |
| return ret; |
| } |
| |
| static int clear_qf_name(struct super_block *sb, int qtype) |
| { |
| |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| char *old_qname = get_qf_name(sb, sbi, qtype); |
| |
| if (sb_any_quota_loaded(sb) && old_qname) { |
| ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options" |
| " when quota turned on"); |
| return -1; |
| } |
| rcu_assign_pointer(sbi->s_qf_names[qtype], NULL); |
| synchronize_rcu(); |
| kfree(old_qname); |
| return 1; |
| } |
| #endif |
| |
| #define MOPT_SET 0x0001 |
| #define MOPT_CLEAR 0x0002 |
| #define MOPT_NOSUPPORT 0x0004 |
| #define MOPT_EXPLICIT 0x0008 |
| #define MOPT_CLEAR_ERR 0x0010 |
| #define MOPT_GTE0 0x0020 |
| #ifdef CONFIG_QUOTA |
| #define MOPT_Q 0 |
| #define MOPT_QFMT 0x0040 |
| #else |
| #define MOPT_Q MOPT_NOSUPPORT |
| #define MOPT_QFMT MOPT_NOSUPPORT |
| #endif |
| #define MOPT_DATAJ 0x0080 |
| #define MOPT_NO_EXT2 0x0100 |
| #define MOPT_NO_EXT3 0x0200 |
| #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3) |
| #define MOPT_STRING 0x0400 |
| |
| static const struct mount_opts { |
| int token; |
| int mount_opt; |
| int flags; |
| } ext4_mount_opts[] = { |
| {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET}, |
| {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR}, |
| {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET}, |
| {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR}, |
| {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET}, |
| {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR}, |
| {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, |
| MOPT_EXT4_ONLY | MOPT_SET}, |
| {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, |
| MOPT_EXT4_ONLY | MOPT_CLEAR}, |
| {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET}, |
| {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR}, |
| {Opt_delalloc, EXT4_MOUNT_DELALLOC, |
| MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, |
| {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, |
| MOPT_EXT4_ONLY | MOPT_CLEAR}, |
| {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET}, |
| {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR}, |
| {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, |
| MOPT_EXT4_ONLY | MOPT_CLEAR}, |
| {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, |
| MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, |
| {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT | |
| EXT4_MOUNT_JOURNAL_CHECKSUM), |
| MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, |
| {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET}, |
| {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR}, |
| {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR}, |
| {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR}, |
| {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, |
| MOPT_NO_EXT2}, |
| {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, |
| MOPT_NO_EXT2}, |
| {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET}, |
| {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR}, |
| {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET}, |
| {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR}, |
| {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR}, |
| {Opt_commit, 0, MOPT_GTE0}, |
| {Opt_max_batch_time, 0, MOPT_GTE0}, |
| {Opt_min_batch_time, 0, MOPT_GTE0}, |
| {Opt_inode_readahead_blks, 0, MOPT_GTE0}, |
| {Opt_init_itable, 0, MOPT_GTE0}, |
| {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET}, |
| {Opt_stripe, 0, MOPT_GTE0}, |
| {Opt_resuid, 0, MOPT_GTE0}, |
| {Opt_resgid, 0, MOPT_GTE0}, |
| {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0}, |
| {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING}, |
| {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0}, |
| {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ}, |
| {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ}, |
| {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, |
| MOPT_NO_EXT2 | MOPT_DATAJ}, |
| {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET}, |
| {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR}, |
| #ifdef CONFIG_EXT4_FS_POSIX_ACL |
| {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET}, |
| {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR}, |
| #else |
| {Opt_acl, 0, MOPT_NOSUPPORT}, |
| {Opt_noacl, 0, MOPT_NOSUPPORT}, |
| #endif |
| {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET}, |
| {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET}, |
| {Opt_debug_want_extra_isize, 0, MOPT_GTE0}, |
| {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q}, |
| {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, |
| MOPT_SET | MOPT_Q}, |
| {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA, |
| MOPT_SET | MOPT_Q}, |
| {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA, |
| MOPT_SET | MOPT_Q}, |
| {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA | |
| EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA), |
| MOPT_CLEAR | MOPT_Q}, |
| {Opt_usrjquota, 0, MOPT_Q}, |
| {Opt_grpjquota, 0, MOPT_Q}, |
| {Opt_offusrjquota, 0, MOPT_Q}, |
| {Opt_offgrpjquota, 0, MOPT_Q}, |
| {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT}, |
| {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT}, |
| {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT}, |
| {Opt_max_dir_size_kb, 0, MOPT_GTE0}, |
| {Opt_test_dummy_encryption, 0, MOPT_STRING}, |
| {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET}, |
| {Opt_err, 0, 0} |
| }; |
| |
| #ifdef CONFIG_UNICODE |
| static const struct ext4_sb_encodings { |
| __u16 magic; |
| char *name; |
| char *version; |
| } ext4_sb_encoding_map[] = { |
| {EXT4_ENC_UTF8_12_1, "utf8", "12.1.0"}, |
| }; |
| |
| static int ext4_sb_read_encoding(const struct ext4_super_block *es, |
| const struct ext4_sb_encodings **encoding, |
| __u16 *flags) |
| { |
| __u16 magic = le16_to_cpu(es->s_encoding); |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(ext4_sb_encoding_map); i++) |
| if (magic == ext4_sb_encoding_map[i].magic) |
| break; |
| |
| if (i >= ARRAY_SIZE(ext4_sb_encoding_map)) |
| return -EINVAL; |
| |
| *encoding = &ext4_sb_encoding_map[i]; |
| *flags = le16_to_cpu(es->s_encoding_flags); |
| |
| return 0; |
| } |
| #endif |
| |
| static int ext4_set_test_dummy_encryption(struct super_block *sb, |
| const char *opt, |
| const substring_t *arg, |
| bool is_remount) |
| { |
| #ifdef CONFIG_FS_ENCRYPTION |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| int err; |
| |
| /* |
| * This mount option is just for testing, and it's not worthwhile to |
| * implement the extra complexity (e.g. RCU protection) that would be |
| * needed to allow it to be set or changed during remount. We do allow |
| * it to be specified during remount, but only if there is no change. |
| */ |
| if (is_remount && !sbi->s_dummy_enc_ctx.ctx) { |
| ext4_msg(sb, KERN_WARNING, |
| "Can't set test_dummy_encryption on remount"); |
| return -1; |
| } |
| err = fscrypt_set_test_dummy_encryption(sb, arg, &sbi->s_dummy_enc_ctx); |
| if (err) { |
| if (err == -EEXIST) |
| ext4_msg(sb, KERN_WARNING, |
| "Can't change test_dummy_encryption on remount"); |
| else if (err == -EINVAL) |
| ext4_msg(sb, KERN_WARNING, |
| "Value of option \"%s\" is unrecognized", opt); |
| else |
| ext4_msg(sb, KERN_WARNING, |
| "Error processing option \"%s\" [%d]", |
| opt, err); |
| return -1; |
| } |
| ext4_msg(sb, KERN_WARNING, "Test dummy encryption mode enabled"); |
| #else |
| ext4_msg(sb, KERN_WARNING, |
| "Test dummy encryption mount option ignored"); |
| #endif |
| return 1; |
| } |
| |
| static int handle_mount_opt(struct super_block *sb, char *opt, int token, |
| substring_t *args, unsigned long *journal_devnum, |
| unsigned int *journal_ioprio, int is_remount) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| const struct mount_opts *m; |
| kuid_t uid; |
| kgid_t gid; |
| int arg = 0; |
| |
| #ifdef CONFIG_QUOTA |
| if (token == Opt_usrjquota) |
| return set_qf_name(sb, USRQUOTA, &args[0]); |
| else if (token == Opt_grpjquota) |
| return set_qf_name(sb, GRPQUOTA, &args[0]); |
| else if (token == Opt_offusrjquota) |
| return clear_qf_name(sb, USRQUOTA); |
| else if (token == Opt_offgrpjquota) |
| return clear_qf_name(sb, GRPQUOTA); |
| #endif |
| switch (token) { |
| case Opt_noacl: |
| case Opt_nouser_xattr: |
| ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5"); |
| break; |
| case Opt_sb: |
| return 1; /* handled by get_sb_block() */ |
| case Opt_removed: |
| ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt); |
| return 1; |
| case Opt_abort: |
| sbi->s_mount_flags |= EXT4_MF_FS_ABORTED; |
| return 1; |
| case Opt_i_version: |
| sb->s_flags |= SB_I_VERSION; |
| return 1; |
| case Opt_lazytime: |
| sb->s_flags |= SB_LAZYTIME; |
| return 1; |
| case Opt_nolazytime: |
| sb->s_flags &= ~SB_LAZYTIME; |
| return 1; |
| } |
| |
| for (m = ext4_mount_opts; m->token != Opt_err; m++) |
| if (token == m->token) |
| break; |
| |
| if (m->token == Opt_err) { |
| ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" " |
| "or missing value", opt); |
| return -1; |
| } |
| |
| if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) { |
| ext4_msg(sb, KERN_ERR, |
| "Mount option \"%s\" incompatible with ext2", opt); |
| return -1; |
| } |
| if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) { |
| ext4_msg(sb, KERN_ERR, |
| "Mount option \"%s\" incompatible with ext3", opt); |
| return -1; |
| } |
| |
| if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg)) |
| return -1; |
| if (args->from && (m->flags & MOPT_GTE0) && (arg < 0)) |
| return -1; |
| if (m->flags & MOPT_EXPLICIT) { |
| if (m->mount_opt & EXT4_MOUNT_DELALLOC) { |
| set_opt2(sb, EXPLICIT_DELALLOC); |
| } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) { |
| set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM); |
| } else |
| return -1; |
| } |
| if (m->flags & MOPT_CLEAR_ERR) |
| clear_opt(sb, ERRORS_MASK); |
| if (token == Opt_noquota && sb_any_quota_loaded(sb)) { |
| ext4_msg(sb, KERN_ERR, "Cannot change quota " |
| "options when quota turned on"); |
| return -1; |
| } |
| |
| if (m->flags & MOPT_NOSUPPORT) { |
| ext4_msg(sb, KERN_ERR, "%s option not supported", opt); |
| } else if (token == Opt_commit) { |
| if (arg == 0) |
| arg = JBD2_DEFAULT_MAX_COMMIT_AGE; |
| else if (arg > INT_MAX / HZ) { |
| ext4_msg(sb, KERN_ERR, |
| "Invalid commit interval %d, " |
| "must be smaller than %d", |
| arg, INT_MAX / HZ); |
| return -1; |
| } |
| sbi->s_commit_interval = HZ * arg; |
| } else if (token == Opt_debug_want_extra_isize) { |
| if ((arg & 1) || |
| (arg < 4) || |
| (arg > (sbi->s_inode_size - EXT4_GOOD_OLD_INODE_SIZE))) { |
| ext4_msg(sb, KERN_ERR, |
| "Invalid want_extra_isize %d", arg); |
| return -1; |
| } |
| sbi->s_want_extra_isize = arg; |
| } else if (token == Opt_max_batch_time) { |
| sbi->s_max_batch_time = arg; |
| } else if (token == Opt_min_batch_time) { |
| sbi->s_min_batch_time = arg; |
| } else if (token == Opt_inode_readahead_blks) { |
| if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) { |
| ext4_msg(sb, KERN_ERR, |
| "EXT4-fs: inode_readahead_blks must be " |
| "0 or a power of 2 smaller than 2^31"); |
| return -1; |
| } |
| sbi->s_inode_readahead_blks = arg; |
| } else if (token == Opt_init_itable) { |
| set_opt(sb, INIT_INODE_TABLE); |
| if (!args->from) |
| arg = EXT4_DEF_LI_WAIT_MULT; |
| sbi->s_li_wait_mult = arg; |
| } else if (token == Opt_max_dir_size_kb) { |
| sbi->s_max_dir_size_kb = arg; |
| } else if (token == Opt_stripe) { |
| sbi->s_stripe = arg; |
| } else if (token == Opt_resuid) { |
| uid = make_kuid(current_user_ns(), arg); |
| if (!uid_valid(uid)) { |
| ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg); |
| return -1; |
| } |
| sbi->s_resuid = uid; |
| } else if (token == Opt_resgid) { |
| gid = make_kgid(current_user_ns(), arg); |
| if (!gid_valid(gid)) { |
| ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg); |
| return -1; |
| } |
| sbi->s_resgid = gid; |
| } else if (token == Opt_journal_dev) { |
| if (is_remount) { |
| ext4_msg(sb, KERN_ERR, |
| "Cannot specify journal on remount"); |
| return -1; |
| } |
| *journal_devnum = arg; |
| } else if (token == Opt_journal_path) { |
| char *journal_path; |
| struct inode *journal_inode; |
| struct path path; |
| int error; |
| |
| if (is_remount) { |
| ext4_msg(sb, KERN_ERR, |
| "Cannot specify journal on remount"); |
| return -1; |
| } |
| journal_path = match_strdup(&args[0]); |
| if (!journal_path) { |
| ext4_msg(sb, KERN_ERR, "error: could not dup " |
| "journal device string"); |
| return -1; |
| } |
| |
| error = kern_path(journal_path, LOOKUP_FOLLOW, &path); |
| if (error) { |
| ext4_msg(sb, KERN_ERR, "error: could not find " |
| "journal device path: error %d", error); |
| kfree(journal_path); |
| return -1; |
| } |
| |
| journal_inode = d_inode(path.dentry); |
| if (!S_ISBLK(journal_inode->i_mode)) { |
| ext4_msg(sb, KERN_ERR, "error: journal path %s " |
| "is not a block device", journal_path); |
| path_put(&path); |
| kfree(journal_path); |
| return -1; |
| } |
| |
| *journal_devnum = new_encode_dev(journal_inode->i_rdev); |
| path_put(&path); |
| kfree(journal_path); |
| } else if (token == Opt_journal_ioprio) { |
| if (arg > 7) { |
| ext4_msg(sb, KERN_ERR, "Invalid journal IO priority" |
| " (must be 0-7)"); |
| return -1; |
| } |
| *journal_ioprio = |
| IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg); |
| } else if (token == Opt_test_dummy_encryption) { |
| return ext4_set_test_dummy_encryption(sb, opt, &args[0], |
| is_remount); |
| } else if (m->flags & MOPT_DATAJ) { |
| 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) != m->mount_opt) { |
| ext4_msg(sb, KERN_ERR, |
| "Cannot change data mode on remount"); |
| return -1; |
| } |
| } else { |
| clear_opt(sb, DATA_FLAGS); |
| sbi->s_mount_opt |= m->mount_opt; |
| } |
| #ifdef CONFIG_QUOTA |
| } else if (m->flags & MOPT_QFMT) { |
| if (sb_any_quota_loaded(sb) && |
| sbi->s_jquota_fmt != m->mount_opt) { |
| ext4_msg(sb, KERN_ERR, "Cannot change journaled " |
| "quota options when quota turned on"); |
| return -1; |
| } |
| if (ext4_has_feature_quota(sb)) { |
| ext4_msg(sb, KERN_INFO, |
| "Quota format mount options ignored " |
| "when QUOTA feature is enabled"); |
| return 1; |
| } |
| sbi->s_jquota_fmt = m->mount_opt; |
| #endif |
| } else if (token == Opt_dax) { |
| #ifdef CONFIG_FS_DAX |
| ext4_msg(sb, KERN_WARNING, |
| "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); |
| sbi->s_mount_opt |= m->mount_opt; |
| #else |
| ext4_msg(sb, KERN_INFO, "dax option not supported"); |
| return -1; |
| #endif |
| } else if (token == Opt_data_err_abort) { |
| sbi->s_mount_opt |= m->mount_opt; |
| } else if (token == Opt_data_err_ignore) { |
| sbi->s_mount_opt &= ~m->mount_opt; |
| } else { |
| if (!args->from) |
| arg = 1; |
| if (m->flags & MOPT_CLEAR) |
| arg = !arg; |
| else if (unlikely(!(m->flags & MOPT_SET))) { |
| ext4_msg(sb, KERN_WARNING, |
| "buggy handling of option %s", opt); |
| WARN_ON(1); |
| return -1; |
| } |
| if (arg != 0) |
| sbi->s_mount_opt |= m->mount_opt; |
| else |
| sbi->s_mount_opt &= ~m->mount_opt; |
| } |
| return 1; |
| } |
| |
| static int parse_options(char *options, struct super_block *sb, |
| unsigned long *journal_devnum, |
| unsigned int *journal_ioprio, |
| int is_remount) |
| { |
| struct ext4_sb_info __maybe_unused *sbi = EXT4_SB(sb); |
| char *p, __maybe_unused *usr_qf_name, __maybe_unused *grp_qf_name; |
| substring_t args[MAX_OPT_ARGS]; |
| int token; |
| |
| if (!options) |
| return 1; |
| |
| while ((p = strsep(&options, ",")) != NULL) { |
| 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); |
| if (handle_mount_opt(sb, p, token, args, journal_devnum, |
| journal_ioprio, is_remount) < 0) |
| return 0; |
| } |
| #ifdef CONFIG_QUOTA |
| /* |
| * We do the test below only for project quotas. 'usrquota' and |
| * 'grpquota' mount options are allowed even without quota feature |
| * to support legacy quotas in quota files. |
| */ |
| if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) { |
| ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. " |
| "Cannot enable project quota enforcement."); |
| return 0; |
| } |
| usr_qf_name = get_qf_name(sb, sbi, USRQUOTA); |
| grp_qf_name = get_qf_name(sb, sbi, GRPQUOTA); |
| if (usr_qf_name || grp_qf_name) { |
| if (test_opt(sb, USRQUOTA) && usr_qf_name) |
| clear_opt(sb, USRQUOTA); |
| |
| if (test_opt(sb, GRPQUOTA) && grp_qf_name) |
| 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; |
| } |
| } |
| #endif |
| if (test_opt(sb, DIOREAD_NOLOCK)) { |
| int blocksize = |
| BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); |
| if (blocksize < PAGE_SIZE) |
| ext4_msg(sb, KERN_WARNING, "Warning: mounting with an " |
| "experimental mount option 'dioread_nolock' " |
| "for blocksize < PAGE_SIZE"); |
| } |
| return 1; |
| } |
| |
| 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); |
| char *usr_qf_name, *grp_qf_name; |
| |
| 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); |
| } |
| |
| rcu_read_lock(); |
| usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]); |
| grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]); |
| if (usr_qf_name) |
| seq_show_option(seq, "usrjquota", usr_qf_name); |
| if (grp_qf_name) |
| seq_show_option(seq, "grpjquota", grp_qf_name); |
| rcu_read_unlock(); |
| #endif |
| } |
| |
| static const char *token2str(int token) |
| { |
| const struct match_token *t; |
| |
| for (t = tokens; t->token != Opt_err; t++) |
| if (t->token == token && !strchr(t->pattern, '=')) |
| break; |
| return t->pattern; |
| } |
| |
| /* |
| * 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 super_block *sb, |
| int nodefs) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_super_block *es = sbi->s_es; |
| int def_errors, def_mount_opt = sbi->s_def_mount_opt; |
| const struct mount_opts *m; |
| char sep = nodefs ? '\n' : ','; |
| |
| #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep) |
| #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg) |
| |
| if (sbi->s_sb_block != 1) |
| SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block); |
| |
| for (m = ext4_mount_opts; m->token != Opt_err; m++) { |
| int want_set = m->flags & MOPT_SET; |
| if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) || |
| (m->flags & MOPT_CLEAR_ERR)) |
| continue; |
| if (!nodefs && !(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt))) |
| continue; /* skip if same as the default */ |
| if ((want_set && |
| (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) || |
| (!want_set && (sbi->s_mount_opt & m->mount_opt))) |
| continue; /* select Opt_noFoo vs Opt_Foo */ |
| SEQ_OPTS_PRINT("%s", token2str(m->token)); |
| } |
| |
| if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) || |
| le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) |
| SEQ_OPTS_PRINT("resuid=%u", |
| from_kuid_munged(&init_user_ns, sbi->s_resuid)); |
| if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) || |
| le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) |
| SEQ_OPTS_PRINT("resgid=%u", |
| from_kgid_munged(&init_user_ns, sbi->s_resgid)); |
| def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors); |
| if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO) |
| SEQ_OPTS_PUTS("errors=remount-ro"); |
| if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) |
| SEQ_OPTS_PUTS("errors=continue"); |
| if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) |
| SEQ_OPTS_PUTS("errors=panic"); |
| if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) |
| SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ); |
| if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) |
| SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time); |
| if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) |
| SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time); |
| if (sb->s_flags & SB_I_VERSION) |
| SEQ_OPTS_PUTS("i_version"); |
| if (nodefs || sbi->s_stripe) |
| SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe); |
| if (nodefs || EXT4_MOUNT_DATA_FLAGS & |
| (sbi->s_mount_opt ^ def_mount_opt)) { |
| if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) |
| SEQ_OPTS_PUTS("data=journal"); |
| else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) |
| SEQ_OPTS_PUTS("data=ordered"); |
| else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) |
| SEQ_OPTS_PUTS("data=writeback"); |
| } |
| if (nodefs || |
| sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) |
| SEQ_OPTS_PRINT("inode_readahead_blks=%u", |
| sbi->s_inode_readahead_blks); |
| |
| if (test_opt(sb, INIT_INODE_TABLE) && (nodefs || |
| (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT))) |
| SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult); |
| if (nodefs || sbi->s_max_dir_size_kb) |
| SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb); |
| if (test_opt(sb, DATA_ERR_ABORT)) |
| SEQ_OPTS_PUTS("data_err=abort"); |
| |
| fscrypt_show_test_dummy_encryption(seq, sep, sb); |
| |
| ext4_show_quota_options(seq, sb); |
| return 0; |
| } |
| |
| static int ext4_show_options(struct seq_file *seq, struct dentry *root) |
| { |
| return _ext4_show_options(seq, root->d_sb, 0); |
| } |
| |
| int ext4_seq_options_show(struct seq_file *seq, void *offset) |
| { |
| struct super_block *sb = seq->private; |
| int rc; |
| |
| seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw"); |
| rc = _ext4_show_options(seq, sb, 1); |
| seq_puts(seq, "\n"); |
| return rc; |
| } |
| |
| 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 err = 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"); |
| err = -EROFS; |
| } |
| 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) && |
| (ext4_get_tstamp(es, s_lastcheck) + |
| le32_to_cpu(es->s_checkinterval) <= ktime_get_real_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); |
| ext4_update_tstamp(es, s_mtime); |
| if (sbi->s_journal) |
| ext4_set_feature_journal_needs_recovery(sb); |
| |
| err = 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 err; |
| } |
| |
| int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct flex_groups **old_groups, **new_groups; |
| int size, i, j; |
| |
| if (!sbi->s_log_groups_per_flex) |
| return 0; |
| |
| size = ext4_flex_group(sbi, ngroup - 1) + 1; |
| if (size <= sbi->s_flex_groups_allocated) |
| return 0; |
| |
| new_groups = kvzalloc(roundup_pow_of_two(size * |
| sizeof(*sbi->s_flex_groups)), GFP_KERNEL); |
| if (!new_groups) { |
| ext4_msg(sb, KERN_ERR, |
| "not enough memory for %d flex group pointers", size); |
| return -ENOMEM; |
| } |
| for (i = sbi->s_flex_groups_allocated; i < size; i++) { |
| new_groups[i] = kvzalloc(roundup_pow_of_two( |
| sizeof(struct flex_groups)), |
| GFP_KERNEL); |
| if (!new_groups[i]) { |
| for (j = sbi->s_flex_groups_allocated; j < i; j++) |
| kvfree(new_groups[j]); |
| kvfree(new_groups); |
| ext4_msg(sb, KERN_ERR, |
| "not enough memory for %d flex groups", size); |
| return -ENOMEM; |
| } |
| } |
| rcu_read_lock(); |
| old_groups = rcu_dereference(sbi->s_flex_groups); |
| if (old_groups) |
| memcpy(new_groups, old_groups, |
| (sbi->s_flex_groups_allocated * |
| sizeof(struct flex_groups *))); |
| rcu_read_unlock(); |
| rcu_assign_pointer(sbi->s_flex_groups, new_groups); |
| sbi->s_flex_groups_allocated = size; |
| if (old_groups) |
| ext4_kvfree_array_rcu(old_groups); |
| return 0; |
| } |
| |
| static int ext4_fill_flex_info(struct super_block *sb) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_group_desc *gdp = NULL; |
| struct flex_groups *fg; |
| ext4_group_t flex_group; |
| int i, err; |
| |
| 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; |
| } |
| |
| err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count); |
| if (err) |
| 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); |
| fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group); |
| atomic_add(ext4_free_inodes_count(sb, gdp), &fg->free_inodes); |
| atomic64_add(ext4_free_group_clusters(sb, gdp), |
| &fg->free_clusters); |
| atomic_add(ext4_used_dirs_count(sb, gdp), &fg->used_dirs); |
| } |
| |
| return 1; |
| failed: |
| return 0; |
| } |
| |
| static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group, |
| struct ext4_group_desc *gdp) |
| { |
| int offset = offsetof(struct ext4_group_desc, bg_checksum); |
| __u16 crc = 0; |
| __le32 le_group = cpu_to_le32(block_group); |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| |
| if (ext4_has_metadata_csum(sbi->s_sb)) { |
| /* Use new metadata_csum algorithm */ |
| __u32 csum32; |
| __u16 dummy_csum = 0; |
| |
| csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group, |
| sizeof(le_group)); |
| csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset); |
| csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum, |
| sizeof(dummy_csum)); |
| offset += sizeof(dummy_csum); |
| if (offset < sbi->s_desc_size) |
| csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset, |
| sbi->s_desc_size - offset); |
| |
| crc = csum32 & 0xFFFF; |
| goto out; |
| } |
| |
| /* old crc16 code */ |
| if (!ext4_has_feature_gdt_csum(sb)) |
| return 0; |
| |
| 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 (ext4_has_feature_64bit(sb) && |
| 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); |
| |
| out: |
| return cpu_to_le16(crc); |
| } |
| |
| int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group, |
| struct ext4_group_desc *gdp) |
| { |
| if (ext4_has_group_desc_csum(sb) && |
| (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp))) |
| return 0; |
| |
| return 1; |
| } |
| |
| void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group, |
| struct ext4_group_desc *gdp) |
| { |
| if (!ext4_has_group_desc_csum(sb)) |
| return; |
| gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp); |
| } |
| |
| /* Called at mount-time, super-block is locked */ |
| static int ext4_check_descriptors(struct super_block *sb, |
| ext4_fsblk_t sb_block, |
| 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 last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0); |
| 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_feature_flex_bg(sb)) |
| 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 == sb_block) { |
| ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " |
| "Block bitmap for group %u overlaps " |
| "superblock", i); |
| if (!sb_rdonly(sb)) |
| return 0; |
| } |
| if (block_bitmap >= sb_block + 1 && |
| block_bitmap <= last_bg_block) { |
| ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " |
| "Block bitmap for group %u overlaps " |
| "block group descriptors", i); |
| if (!sb_rdonly(sb)) |
| return 0; |
| } |
| 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 == sb_block) { |
| ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " |
| "Inode bitmap for group %u overlaps " |
| "superblock", i); |
| if (!sb_rdonly(sb)) |
| return 0; |
| } |
| if (inode_bitmap >= sb_block + 1 && |
| inode_bitmap <= last_bg_block) { |
| ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " |
| "Inode bitmap for group %u overlaps " |
| "block group descriptors", i); |
| if (!sb_rdonly(sb)) |
| return 0; |
| } |
| 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 == sb_block) { |
| ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " |
| "Inode table for group %u overlaps " |
| "superblock", i); |
| if (!sb_rdonly(sb)) |
| return 0; |
| } |
| if (inode_table >= sb_block + 1 && |
| inode_table <= last_bg_block) { |
| ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " |
| "Inode table for group %u overlaps " |
| "block group descriptors", i); |
| if (!sb_rdonly(sb)) |
| return 0; |
| } |
| 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(sb, 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(sb, i, |
| gdp)), le16_to_cpu(gdp->bg_checksum)); |
| if (!sb_rdonly(sb)) { |
| 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; |
| 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 ret, nr_orphans = 0, nr_truncates = 0; |
| #ifdef CONFIG_QUOTA |
| int quota_update = 0; |
| 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) { |
| /* don't clear list on RO mount w/ errors */ |
| if (es->s_last_orphan && !(s_flags & SB_RDONLY)) { |
| ext4_msg(sb, KERN_INFO, "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 & SB_RDONLY) { |
| ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs"); |
| sb->s_flags &= ~SB_RDONLY; |
| } |
| #ifdef CONFIG_QUOTA |
| /* Needed for iput() to work correctly and not trash data */ |
| sb->s_flags |= SB_ACTIVE; |
| |
| /* |
| * Turn on quotas which were not enabled for read-only mounts if |
| * filesystem has quota feature, so that they are updated correctly. |
| */ |
| if (ext4_has_feature_quota(sb) && (s_flags & SB_RDONLY)) { |
| int ret = ext4_enable_quotas(sb); |
| |
| if (!ret) |
| quota_update = 1; |
| else |
| ext4_msg(sb, KERN_ERR, |
| "Cannot turn on quotas: error %d", ret); |
| } |
| |
| /* Turn on journaled quotas used for old sytle */ |
| for (i = 0; i < EXT4_MAXQUOTAS; i++) { |
| if (EXT4_SB(sb)->s_qf_names[i]) { |
| int ret = ext4_quota_on_mount(sb, i); |
| |
| if (!ret) |
| quota_update = 1; |
| else |
| ext4_msg(sb, KERN_ERR, |
| "Cannot turn on journaled " |
| "quota: type %d: error %d", i, ret); |
| } |
| } |
| #endif |
| |
| while (es->s_last_orphan) { |
| struct inode *inode; |
| |
| /* |
| * We may have encountered an error during cleanup; if |
| * so, skip the rest. |
| */ |
| if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { |
| jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); |
| es->s_last_orphan = 0; |
| break; |
| } |
| |
| 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) { |
| if (test_opt(sb, DEBUG)) |
| 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); |
| inode_lock(inode); |
| truncate_inode_pages(inode->i_mapping, inode->i_size); |
| ret = ext4_truncate(inode); |
| if (ret) |
| ext4_std_error(inode->i_sb, ret); |
| inode_unlock(inode); |
| nr_truncates++; |
| } else { |
| if (test_opt(sb, DEBUG)) |
| 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 off quotas if they were enabled for orphan cleanup */ |
| if (quota_update) { |
| for (i = 0; i < EXT4_MAXQUOTAS; i++) { |
| if (sb_dqopt(sb)->files[i]) |
| dquot_quota_off(sb, i); |
| } |
| } |
| #endif |
| sb->s_flags = s_flags; /* Restore SB_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; |
| |
| BUILD_BUG_ON(sizeof(blkcnt_t) < sizeof(u64)); |
| |
| if (!has_huge_files) { |
| 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, |
| <