mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 23:36:40 +07:00
ece78b7df7
Pull ext2, ext3 and quota fixes from Jan Kara: "Interesting bits are: - removal of a special i_mutex locking subclass (I_MUTEX_QUOTA) since quota code does not need i_mutex anymore in any unusual way. - backport (from ext4) of a fix of a checkpointing bug (missing cache flush) that could lead to fs corruption on power failure The rest are just random small fixes & cleanups." * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: ext2: trivial fix to comment for ext2_free_blocks ext2: remove the redundant comment for ext2_export_ops ext3: return 32/64-bit dir name hash according to usage type quota: Get rid of nested I_MUTEX_QUOTA locking subclass quota: Use precomputed value of sb_dqopt in dquot_quota_sync ext2: Remove i_mutex use from ext2_quota_write() reiserfs: Remove i_mutex use from reiserfs_quota_write() ext4: Remove i_mutex use from ext4_quota_write() ext3: Remove i_mutex use from ext3_quota_write() quota: Fix double lock in add_dquot_ref() with CONFIG_QUOTA_DEBUG jbd: Write journal superblock with WRITE_FUA after checkpointing jbd: protect all log tail updates with j_checkpoint_mutex jbd: Split updating of journal superblock and marking journal empty ext2: do not register write_super within VFS ext2: Remove s_dirt handling ext2: write superblock only once on unmount ext3: update documentation with barrier=1 default ext3: remove max_debt in find_group_orlov() jbd: Refine commit writeout logic
1527 lines
41 KiB
C
1527 lines
41 KiB
C
/*
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* linux/fs/ext2/super.c
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/fs/minix/inode.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* Big-endian to little-endian byte-swapping/bitmaps by
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* David S. Miller (davem@caip.rutgers.edu), 1995
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <linux/parser.h>
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#include <linux/random.h>
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#include <linux/buffer_head.h>
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#include <linux/exportfs.h>
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#include <linux/vfs.h>
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#include <linux/seq_file.h>
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#include <linux/mount.h>
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#include <linux/log2.h>
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#include <linux/quotaops.h>
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#include <asm/uaccess.h>
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#include "ext2.h"
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#include "xattr.h"
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#include "acl.h"
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#include "xip.h"
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static void ext2_sync_super(struct super_block *sb,
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struct ext2_super_block *es, int wait);
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static int ext2_remount (struct super_block * sb, int * flags, char * data);
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static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
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static int ext2_sync_fs(struct super_block *sb, int wait);
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void ext2_error(struct super_block *sb, const char *function,
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const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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struct ext2_sb_info *sbi = EXT2_SB(sb);
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struct ext2_super_block *es = sbi->s_es;
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if (!(sb->s_flags & MS_RDONLY)) {
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spin_lock(&sbi->s_lock);
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sbi->s_mount_state |= EXT2_ERROR_FS;
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es->s_state |= cpu_to_le16(EXT2_ERROR_FS);
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spin_unlock(&sbi->s_lock);
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ext2_sync_super(sb, es, 1);
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}
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n",
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sb->s_id, function, &vaf);
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va_end(args);
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if (test_opt(sb, ERRORS_PANIC))
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panic("EXT2-fs: panic from previous error\n");
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if (test_opt(sb, ERRORS_RO)) {
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ext2_msg(sb, KERN_CRIT,
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"error: remounting filesystem read-only");
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sb->s_flags |= MS_RDONLY;
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}
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}
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void ext2_msg(struct super_block *sb, const char *prefix,
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const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
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va_end(args);
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}
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/*
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* This must be called with sbi->s_lock held.
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*/
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void ext2_update_dynamic_rev(struct super_block *sb)
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{
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struct ext2_super_block *es = EXT2_SB(sb)->s_es;
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if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV)
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return;
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ext2_msg(sb, KERN_WARNING,
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"warning: updating to rev %d because of "
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"new feature flag, running e2fsck is recommended",
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EXT2_DYNAMIC_REV);
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es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO);
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es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE);
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es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV);
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/* leave es->s_feature_*compat flags alone */
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/* es->s_uuid will be set by e2fsck if empty */
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/*
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* The rest of the superblock fields should be zero, and if not it
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* means they are likely already in use, so leave them alone. We
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* can leave it up to e2fsck to clean up any inconsistencies there.
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*/
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}
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static void ext2_put_super (struct super_block * sb)
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{
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int db_count;
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int i;
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struct ext2_sb_info *sbi = EXT2_SB(sb);
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dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
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ext2_xattr_put_super(sb);
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if (!(sb->s_flags & MS_RDONLY)) {
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struct ext2_super_block *es = sbi->s_es;
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spin_lock(&sbi->s_lock);
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es->s_state = cpu_to_le16(sbi->s_mount_state);
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spin_unlock(&sbi->s_lock);
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ext2_sync_super(sb, es, 1);
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}
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db_count = sbi->s_gdb_count;
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for (i = 0; i < db_count; i++)
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if (sbi->s_group_desc[i])
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brelse (sbi->s_group_desc[i]);
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kfree(sbi->s_group_desc);
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kfree(sbi->s_debts);
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percpu_counter_destroy(&sbi->s_freeblocks_counter);
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percpu_counter_destroy(&sbi->s_freeinodes_counter);
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percpu_counter_destroy(&sbi->s_dirs_counter);
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brelse (sbi->s_sbh);
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sb->s_fs_info = NULL;
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kfree(sbi->s_blockgroup_lock);
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kfree(sbi);
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}
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static struct kmem_cache * ext2_inode_cachep;
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static struct inode *ext2_alloc_inode(struct super_block *sb)
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{
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struct ext2_inode_info *ei;
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ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL);
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if (!ei)
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return NULL;
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ei->i_block_alloc_info = NULL;
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ei->vfs_inode.i_version = 1;
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return &ei->vfs_inode;
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}
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static void ext2_i_callback(struct rcu_head *head)
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{
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struct inode *inode = container_of(head, struct inode, i_rcu);
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kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
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}
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static void ext2_destroy_inode(struct inode *inode)
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{
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call_rcu(&inode->i_rcu, ext2_i_callback);
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}
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static void init_once(void *foo)
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{
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struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
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rwlock_init(&ei->i_meta_lock);
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#ifdef CONFIG_EXT2_FS_XATTR
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init_rwsem(&ei->xattr_sem);
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#endif
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mutex_init(&ei->truncate_mutex);
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inode_init_once(&ei->vfs_inode);
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}
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static int init_inodecache(void)
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{
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ext2_inode_cachep = kmem_cache_create("ext2_inode_cache",
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sizeof(struct ext2_inode_info),
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0, (SLAB_RECLAIM_ACCOUNT|
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SLAB_MEM_SPREAD),
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init_once);
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if (ext2_inode_cachep == NULL)
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return -ENOMEM;
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return 0;
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}
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static void destroy_inodecache(void)
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{
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kmem_cache_destroy(ext2_inode_cachep);
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}
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static int ext2_show_options(struct seq_file *seq, struct dentry *root)
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{
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struct super_block *sb = root->d_sb;
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struct ext2_sb_info *sbi = EXT2_SB(sb);
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struct ext2_super_block *es = sbi->s_es;
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unsigned long def_mount_opts;
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spin_lock(&sbi->s_lock);
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def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
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if (sbi->s_sb_block != 1)
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seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
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if (test_opt(sb, MINIX_DF))
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seq_puts(seq, ",minixdf");
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if (test_opt(sb, GRPID))
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seq_puts(seq, ",grpid");
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if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS))
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seq_puts(seq, ",nogrpid");
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if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) ||
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le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) {
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seq_printf(seq, ",resuid=%u",
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from_kuid_munged(&init_user_ns, sbi->s_resuid));
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}
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if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) ||
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le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) {
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seq_printf(seq, ",resgid=%u",
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from_kgid_munged(&init_user_ns, sbi->s_resgid));
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}
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if (test_opt(sb, ERRORS_RO)) {
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int def_errors = le16_to_cpu(es->s_errors);
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if (def_errors == EXT2_ERRORS_PANIC ||
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def_errors == EXT2_ERRORS_CONTINUE) {
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seq_puts(seq, ",errors=remount-ro");
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}
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}
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if (test_opt(sb, ERRORS_CONT))
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seq_puts(seq, ",errors=continue");
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if (test_opt(sb, ERRORS_PANIC))
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seq_puts(seq, ",errors=panic");
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if (test_opt(sb, NO_UID32))
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seq_puts(seq, ",nouid32");
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if (test_opt(sb, DEBUG))
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seq_puts(seq, ",debug");
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if (test_opt(sb, OLDALLOC))
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seq_puts(seq, ",oldalloc");
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#ifdef CONFIG_EXT2_FS_XATTR
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if (test_opt(sb, XATTR_USER))
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seq_puts(seq, ",user_xattr");
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if (!test_opt(sb, XATTR_USER) &&
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(def_mount_opts & EXT2_DEFM_XATTR_USER)) {
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seq_puts(seq, ",nouser_xattr");
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}
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#endif
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#ifdef CONFIG_EXT2_FS_POSIX_ACL
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if (test_opt(sb, POSIX_ACL))
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seq_puts(seq, ",acl");
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if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL))
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seq_puts(seq, ",noacl");
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#endif
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if (test_opt(sb, NOBH))
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seq_puts(seq, ",nobh");
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#if defined(CONFIG_QUOTA)
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if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA)
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seq_puts(seq, ",usrquota");
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if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA)
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seq_puts(seq, ",grpquota");
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#endif
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#if defined(CONFIG_EXT2_FS_XIP)
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if (sbi->s_mount_opt & EXT2_MOUNT_XIP)
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seq_puts(seq, ",xip");
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#endif
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if (!test_opt(sb, RESERVATION))
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seq_puts(seq, ",noreservation");
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spin_unlock(&sbi->s_lock);
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return 0;
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}
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#ifdef CONFIG_QUOTA
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static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
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static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
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#endif
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static const struct super_operations ext2_sops = {
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.alloc_inode = ext2_alloc_inode,
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.destroy_inode = ext2_destroy_inode,
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.write_inode = ext2_write_inode,
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.evict_inode = ext2_evict_inode,
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.put_super = ext2_put_super,
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.sync_fs = ext2_sync_fs,
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.statfs = ext2_statfs,
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.remount_fs = ext2_remount,
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.show_options = ext2_show_options,
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#ifdef CONFIG_QUOTA
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.quota_read = ext2_quota_read,
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.quota_write = ext2_quota_write,
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#endif
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};
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static struct inode *ext2_nfs_get_inode(struct super_block *sb,
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u64 ino, u32 generation)
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{
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struct inode *inode;
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if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
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return ERR_PTR(-ESTALE);
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if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
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return ERR_PTR(-ESTALE);
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/*
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* ext2_iget isn't quite right if the inode is currently unallocated!
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* However ext2_iget currently does appropriate checks to handle stale
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* inodes so everything is OK.
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*/
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inode = ext2_iget(sb, ino);
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if (IS_ERR(inode))
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return ERR_CAST(inode);
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if (generation && inode->i_generation != generation) {
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/* we didn't find the right inode.. */
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iput(inode);
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return ERR_PTR(-ESTALE);
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}
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return inode;
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}
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static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid,
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int fh_len, int fh_type)
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{
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return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
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ext2_nfs_get_inode);
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}
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static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
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int fh_len, int fh_type)
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{
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return generic_fh_to_parent(sb, fid, fh_len, fh_type,
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ext2_nfs_get_inode);
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}
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static const struct export_operations ext2_export_ops = {
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.fh_to_dentry = ext2_fh_to_dentry,
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.fh_to_parent = ext2_fh_to_parent,
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.get_parent = ext2_get_parent,
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};
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static unsigned long get_sb_block(void **data)
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{
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unsigned long sb_block;
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char *options = (char *) *data;
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if (!options || strncmp(options, "sb=", 3) != 0)
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return 1; /* Default location */
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options += 3;
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sb_block = simple_strtoul(options, &options, 0);
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if (*options && *options != ',') {
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printk("EXT2-fs: Invalid sb specification: %s\n",
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(char *) *data);
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return 1;
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}
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if (*options == ',')
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options++;
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*data = (void *) options;
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return sb_block;
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}
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enum {
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Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
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Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
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Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
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Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
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Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota,
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Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
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};
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static const match_table_t tokens = {
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{Opt_bsd_df, "bsddf"},
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{Opt_minix_df, "minixdf"},
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{Opt_grpid, "grpid"},
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{Opt_grpid, "bsdgroups"},
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{Opt_nogrpid, "nogrpid"},
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{Opt_nogrpid, "sysvgroups"},
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{Opt_resgid, "resgid=%u"},
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{Opt_resuid, "resuid=%u"},
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{Opt_sb, "sb=%u"},
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{Opt_err_cont, "errors=continue"},
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{Opt_err_panic, "errors=panic"},
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{Opt_err_ro, "errors=remount-ro"},
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{Opt_nouid32, "nouid32"},
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{Opt_nocheck, "check=none"},
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{Opt_nocheck, "nocheck"},
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{Opt_debug, "debug"},
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{Opt_oldalloc, "oldalloc"},
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{Opt_orlov, "orlov"},
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{Opt_nobh, "nobh"},
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{Opt_user_xattr, "user_xattr"},
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{Opt_nouser_xattr, "nouser_xattr"},
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{Opt_acl, "acl"},
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{Opt_noacl, "noacl"},
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{Opt_xip, "xip"},
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{Opt_grpquota, "grpquota"},
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{Opt_ignore, "noquota"},
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{Opt_quota, "quota"},
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{Opt_usrquota, "usrquota"},
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{Opt_reservation, "reservation"},
|
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{Opt_noreservation, "noreservation"},
|
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{Opt_err, NULL}
|
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};
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|
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static int parse_options(char *options, struct super_block *sb)
|
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{
|
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char *p;
|
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struct ext2_sb_info *sbi = EXT2_SB(sb);
|
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substring_t args[MAX_OPT_ARGS];
|
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int option;
|
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kuid_t uid;
|
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kgid_t gid;
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|
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if (!options)
|
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return 1;
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|
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while ((p = strsep (&options, ",")) != NULL) {
|
|
int token;
|
|
if (!*p)
|
|
continue;
|
|
|
|
token = match_token(p, tokens, args);
|
|
switch (token) {
|
|
case Opt_bsd_df:
|
|
clear_opt (sbi->s_mount_opt, MINIX_DF);
|
|
break;
|
|
case Opt_minix_df:
|
|
set_opt (sbi->s_mount_opt, MINIX_DF);
|
|
break;
|
|
case Opt_grpid:
|
|
set_opt (sbi->s_mount_opt, GRPID);
|
|
break;
|
|
case Opt_nogrpid:
|
|
clear_opt (sbi->s_mount_opt, GRPID);
|
|
break;
|
|
case Opt_resuid:
|
|
if (match_int(&args[0], &option))
|
|
return 0;
|
|
uid = make_kuid(current_user_ns(), option);
|
|
if (!uid_valid(uid)) {
|
|
ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option);
|
|
return -1;
|
|
|
|
}
|
|
sbi->s_resuid = uid;
|
|
break;
|
|
case Opt_resgid:
|
|
if (match_int(&args[0], &option))
|
|
return 0;
|
|
gid = make_kgid(current_user_ns(), option);
|
|
if (!gid_valid(gid)) {
|
|
ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option);
|
|
return -1;
|
|
}
|
|
sbi->s_resgid = gid;
|
|
break;
|
|
case Opt_sb:
|
|
/* handled by get_sb_block() instead of here */
|
|
/* *sb_block = match_int(&args[0]); */
|
|
break;
|
|
case Opt_err_panic:
|
|
clear_opt (sbi->s_mount_opt, ERRORS_CONT);
|
|
clear_opt (sbi->s_mount_opt, ERRORS_RO);
|
|
set_opt (sbi->s_mount_opt, ERRORS_PANIC);
|
|
break;
|
|
case Opt_err_ro:
|
|
clear_opt (sbi->s_mount_opt, ERRORS_CONT);
|
|
clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
|
|
set_opt (sbi->s_mount_opt, ERRORS_RO);
|
|
break;
|
|
case Opt_err_cont:
|
|
clear_opt (sbi->s_mount_opt, ERRORS_RO);
|
|
clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
|
|
set_opt (sbi->s_mount_opt, ERRORS_CONT);
|
|
break;
|
|
case Opt_nouid32:
|
|
set_opt (sbi->s_mount_opt, NO_UID32);
|
|
break;
|
|
case Opt_nocheck:
|
|
clear_opt (sbi->s_mount_opt, CHECK);
|
|
break;
|
|
case Opt_debug:
|
|
set_opt (sbi->s_mount_opt, DEBUG);
|
|
break;
|
|
case Opt_oldalloc:
|
|
set_opt (sbi->s_mount_opt, OLDALLOC);
|
|
break;
|
|
case Opt_orlov:
|
|
clear_opt (sbi->s_mount_opt, OLDALLOC);
|
|
break;
|
|
case Opt_nobh:
|
|
set_opt (sbi->s_mount_opt, NOBH);
|
|
break;
|
|
#ifdef CONFIG_EXT2_FS_XATTR
|
|
case Opt_user_xattr:
|
|
set_opt (sbi->s_mount_opt, XATTR_USER);
|
|
break;
|
|
case Opt_nouser_xattr:
|
|
clear_opt (sbi->s_mount_opt, XATTR_USER);
|
|
break;
|
|
#else
|
|
case Opt_user_xattr:
|
|
case Opt_nouser_xattr:
|
|
ext2_msg(sb, KERN_INFO, "(no)user_xattr options"
|
|
"not supported");
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_EXT2_FS_POSIX_ACL
|
|
case Opt_acl:
|
|
set_opt(sbi->s_mount_opt, POSIX_ACL);
|
|
break;
|
|
case Opt_noacl:
|
|
clear_opt(sbi->s_mount_opt, POSIX_ACL);
|
|
break;
|
|
#else
|
|
case Opt_acl:
|
|
case Opt_noacl:
|
|
ext2_msg(sb, KERN_INFO,
|
|
"(no)acl options not supported");
|
|
break;
|
|
#endif
|
|
case Opt_xip:
|
|
#ifdef CONFIG_EXT2_FS_XIP
|
|
set_opt (sbi->s_mount_opt, XIP);
|
|
#else
|
|
ext2_msg(sb, KERN_INFO, "xip option not supported");
|
|
#endif
|
|
break;
|
|
|
|
#if defined(CONFIG_QUOTA)
|
|
case Opt_quota:
|
|
case Opt_usrquota:
|
|
set_opt(sbi->s_mount_opt, USRQUOTA);
|
|
break;
|
|
|
|
case Opt_grpquota:
|
|
set_opt(sbi->s_mount_opt, GRPQUOTA);
|
|
break;
|
|
#else
|
|
case Opt_quota:
|
|
case Opt_usrquota:
|
|
case Opt_grpquota:
|
|
ext2_msg(sb, KERN_INFO,
|
|
"quota operations not supported");
|
|
break;
|
|
#endif
|
|
|
|
case Opt_reservation:
|
|
set_opt(sbi->s_mount_opt, RESERVATION);
|
|
ext2_msg(sb, KERN_INFO, "reservations ON");
|
|
break;
|
|
case Opt_noreservation:
|
|
clear_opt(sbi->s_mount_opt, RESERVATION);
|
|
ext2_msg(sb, KERN_INFO, "reservations OFF");
|
|
break;
|
|
case Opt_ignore:
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int ext2_setup_super (struct super_block * sb,
|
|
struct ext2_super_block * es,
|
|
int read_only)
|
|
{
|
|
int res = 0;
|
|
struct ext2_sb_info *sbi = EXT2_SB(sb);
|
|
|
|
if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
|
|
ext2_msg(sb, KERN_ERR,
|
|
"error: revision level too high, "
|
|
"forcing read-only mode");
|
|
res = MS_RDONLY;
|
|
}
|
|
if (read_only)
|
|
return res;
|
|
if (!(sbi->s_mount_state & EXT2_VALID_FS))
|
|
ext2_msg(sb, KERN_WARNING,
|
|
"warning: mounting unchecked fs, "
|
|
"running e2fsck is recommended");
|
|
else if ((sbi->s_mount_state & EXT2_ERROR_FS))
|
|
ext2_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))
|
|
ext2_msg(sb, KERN_WARNING,
|
|
"warning: maximal mount count reached, "
|
|
"running e2fsck is recommended");
|
|
else if (le32_to_cpu(es->s_checkinterval) &&
|
|
(le32_to_cpu(es->s_lastcheck) +
|
|
le32_to_cpu(es->s_checkinterval) <= get_seconds()))
|
|
ext2_msg(sb, KERN_WARNING,
|
|
"warning: checktime reached, "
|
|
"running e2fsck is recommended");
|
|
if (!le16_to_cpu(es->s_max_mnt_count))
|
|
es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
|
|
le16_add_cpu(&es->s_mnt_count, 1);
|
|
if (test_opt (sb, DEBUG))
|
|
ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
|
|
"bpg=%lu, ipg=%lu, mo=%04lx]",
|
|
EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
|
|
sbi->s_frag_size,
|
|
sbi->s_groups_count,
|
|
EXT2_BLOCKS_PER_GROUP(sb),
|
|
EXT2_INODES_PER_GROUP(sb),
|
|
sbi->s_mount_opt);
|
|
return res;
|
|
}
|
|
|
|
static int ext2_check_descriptors(struct super_block *sb)
|
|
{
|
|
int i;
|
|
struct ext2_sb_info *sbi = EXT2_SB(sb);
|
|
|
|
ext2_debug ("Checking group descriptors");
|
|
|
|
for (i = 0; i < sbi->s_groups_count; i++) {
|
|
struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL);
|
|
ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i);
|
|
ext2_fsblk_t last_block;
|
|
|
|
if (i == sbi->s_groups_count - 1)
|
|
last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
|
|
else
|
|
last_block = first_block +
|
|
(EXT2_BLOCKS_PER_GROUP(sb) - 1);
|
|
|
|
if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
|
|
le32_to_cpu(gdp->bg_block_bitmap) > last_block)
|
|
{
|
|
ext2_error (sb, "ext2_check_descriptors",
|
|
"Block bitmap for group %d"
|
|
" not in group (block %lu)!",
|
|
i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
|
|
return 0;
|
|
}
|
|
if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
|
|
le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
|
|
{
|
|
ext2_error (sb, "ext2_check_descriptors",
|
|
"Inode bitmap for group %d"
|
|
" not in group (block %lu)!",
|
|
i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
|
|
return 0;
|
|
}
|
|
if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
|
|
le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
|
|
last_block)
|
|
{
|
|
ext2_error (sb, "ext2_check_descriptors",
|
|
"Inode table for group %d"
|
|
" not in group (block %lu)!",
|
|
i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
|
|
return 0;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Maximal file size. There is a direct, and {,double-,triple-}indirect
|
|
* block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
|
|
* We need to be 1 filesystem block less than the 2^32 sector limit.
|
|
*/
|
|
static loff_t ext2_max_size(int bits)
|
|
{
|
|
loff_t res = EXT2_NDIR_BLOCKS;
|
|
int meta_blocks;
|
|
loff_t upper_limit;
|
|
|
|
/* This is calculated to be the largest file size for a
|
|
* dense, file such that the total number of
|
|
* sectors in the file, including data and all indirect blocks,
|
|
* does not exceed 2^32 -1
|
|
* __u32 i_blocks representing the total number of
|
|
* 512 bytes blocks of the file
|
|
*/
|
|
upper_limit = (1LL << 32) - 1;
|
|
|
|
/* total blocks in file system block size */
|
|
upper_limit >>= (bits - 9);
|
|
|
|
|
|
/* indirect blocks */
|
|
meta_blocks = 1;
|
|
/* double indirect blocks */
|
|
meta_blocks += 1 + (1LL << (bits-2));
|
|
/* tripple indirect blocks */
|
|
meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
|
|
|
|
upper_limit -= meta_blocks;
|
|
upper_limit <<= bits;
|
|
|
|
res += 1LL << (bits-2);
|
|
res += 1LL << (2*(bits-2));
|
|
res += 1LL << (3*(bits-2));
|
|
res <<= bits;
|
|
if (res > upper_limit)
|
|
res = upper_limit;
|
|
|
|
if (res > MAX_LFS_FILESIZE)
|
|
res = MAX_LFS_FILESIZE;
|
|
|
|
return res;
|
|
}
|
|
|
|
static unsigned long descriptor_loc(struct super_block *sb,
|
|
unsigned long logic_sb_block,
|
|
int nr)
|
|
{
|
|
struct ext2_sb_info *sbi = EXT2_SB(sb);
|
|
unsigned long bg, first_meta_bg;
|
|
int has_super = 0;
|
|
|
|
first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
|
|
|
|
if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
|
|
nr < first_meta_bg)
|
|
return (logic_sb_block + nr + 1);
|
|
bg = sbi->s_desc_per_block * nr;
|
|
if (ext2_bg_has_super(sb, bg))
|
|
has_super = 1;
|
|
|
|
return ext2_group_first_block_no(sb, bg) + has_super;
|
|
}
|
|
|
|
static int ext2_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
struct buffer_head * bh;
|
|
struct ext2_sb_info * sbi;
|
|
struct ext2_super_block * es;
|
|
struct inode *root;
|
|
unsigned long block;
|
|
unsigned long sb_block = get_sb_block(&data);
|
|
unsigned long logic_sb_block;
|
|
unsigned long offset = 0;
|
|
unsigned long def_mount_opts;
|
|
long ret = -EINVAL;
|
|
int blocksize = BLOCK_SIZE;
|
|
int db_count;
|
|
int i, j;
|
|
__le32 features;
|
|
int err;
|
|
|
|
err = -ENOMEM;
|
|
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
|
|
if (!sbi)
|
|
goto failed_unlock;
|
|
|
|
sbi->s_blockgroup_lock =
|
|
kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
|
|
if (!sbi->s_blockgroup_lock) {
|
|
kfree(sbi);
|
|
goto failed_unlock;
|
|
}
|
|
sb->s_fs_info = sbi;
|
|
sbi->s_sb_block = sb_block;
|
|
|
|
spin_lock_init(&sbi->s_lock);
|
|
|
|
/*
|
|
* See what the current blocksize for the device is, and
|
|
* use that as the blocksize. Otherwise (or if the blocksize
|
|
* is smaller than the default) use the default.
|
|
* This is important for devices that have a hardware
|
|
* sectorsize that is larger than the default.
|
|
*/
|
|
blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
|
|
if (!blocksize) {
|
|
ext2_msg(sb, KERN_ERR, "error: unable to set blocksize");
|
|
goto failed_sbi;
|
|
}
|
|
|
|
/*
|
|
* If the superblock doesn't start on a hardware sector boundary,
|
|
* calculate the offset.
|
|
*/
|
|
if (blocksize != BLOCK_SIZE) {
|
|
logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
|
|
offset = (sb_block*BLOCK_SIZE) % blocksize;
|
|
} else {
|
|
logic_sb_block = sb_block;
|
|
}
|
|
|
|
if (!(bh = sb_bread(sb, logic_sb_block))) {
|
|
ext2_msg(sb, KERN_ERR, "error: unable to read superblock");
|
|
goto failed_sbi;
|
|
}
|
|
/*
|
|
* Note: s_es must be initialized as soon as possible because
|
|
* some ext2 macro-instructions depend on its value
|
|
*/
|
|
es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
|
|
sbi->s_es = es;
|
|
sb->s_magic = le16_to_cpu(es->s_magic);
|
|
|
|
if (sb->s_magic != EXT2_SUPER_MAGIC)
|
|
goto cantfind_ext2;
|
|
|
|
/* Set defaults before we parse the mount options */
|
|
def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
|
|
if (def_mount_opts & EXT2_DEFM_DEBUG)
|
|
set_opt(sbi->s_mount_opt, DEBUG);
|
|
if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
|
|
set_opt(sbi->s_mount_opt, GRPID);
|
|
if (def_mount_opts & EXT2_DEFM_UID16)
|
|
set_opt(sbi->s_mount_opt, NO_UID32);
|
|
#ifdef CONFIG_EXT2_FS_XATTR
|
|
if (def_mount_opts & EXT2_DEFM_XATTR_USER)
|
|
set_opt(sbi->s_mount_opt, XATTR_USER);
|
|
#endif
|
|
#ifdef CONFIG_EXT2_FS_POSIX_ACL
|
|
if (def_mount_opts & EXT2_DEFM_ACL)
|
|
set_opt(sbi->s_mount_opt, POSIX_ACL);
|
|
#endif
|
|
|
|
if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
|
|
set_opt(sbi->s_mount_opt, ERRORS_PANIC);
|
|
else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
|
|
set_opt(sbi->s_mount_opt, ERRORS_CONT);
|
|
else
|
|
set_opt(sbi->s_mount_opt, ERRORS_RO);
|
|
|
|
sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
|
|
sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
|
|
|
|
set_opt(sbi->s_mount_opt, RESERVATION);
|
|
|
|
if (!parse_options((char *) data, sb))
|
|
goto failed_mount;
|
|
|
|
sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
|
|
((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
|
|
MS_POSIXACL : 0);
|
|
|
|
ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
|
|
EXT2_MOUNT_XIP if not */
|
|
|
|
if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
|
|
(EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
|
|
EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
|
|
EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
|
|
ext2_msg(sb, KERN_WARNING,
|
|
"warning: feature flags set on rev 0 fs, "
|
|
"running e2fsck is recommended");
|
|
/*
|
|
* Check feature flags regardless of the revision level, since we
|
|
* previously didn't change the revision level when setting the flags,
|
|
* so there is a chance incompat flags are set on a rev 0 filesystem.
|
|
*/
|
|
features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
|
|
if (features) {
|
|
ext2_msg(sb, KERN_ERR, "error: couldn't mount because of "
|
|
"unsupported optional features (%x)",
|
|
le32_to_cpu(features));
|
|
goto failed_mount;
|
|
}
|
|
if (!(sb->s_flags & MS_RDONLY) &&
|
|
(features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
|
|
ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of "
|
|
"unsupported optional features (%x)",
|
|
le32_to_cpu(features));
|
|
goto failed_mount;
|
|
}
|
|
|
|
blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
|
|
|
|
if (ext2_use_xip(sb) && blocksize != PAGE_SIZE) {
|
|
if (!silent)
|
|
ext2_msg(sb, KERN_ERR,
|
|
"error: unsupported blocksize for xip");
|
|
goto failed_mount;
|
|
}
|
|
|
|
/* If the blocksize doesn't match, re-read the thing.. */
|
|
if (sb->s_blocksize != blocksize) {
|
|
brelse(bh);
|
|
|
|
if (!sb_set_blocksize(sb, blocksize)) {
|
|
ext2_msg(sb, KERN_ERR,
|
|
"error: bad blocksize %d", blocksize);
|
|
goto failed_sbi;
|
|
}
|
|
|
|
logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
|
|
offset = (sb_block*BLOCK_SIZE) % blocksize;
|
|
bh = sb_bread(sb, logic_sb_block);
|
|
if(!bh) {
|
|
ext2_msg(sb, KERN_ERR, "error: couldn't read"
|
|
"superblock on 2nd try");
|
|
goto failed_sbi;
|
|
}
|
|
es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
|
|
sbi->s_es = es;
|
|
if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
|
|
ext2_msg(sb, KERN_ERR, "error: magic mismatch");
|
|
goto failed_mount;
|
|
}
|
|
}
|
|
|
|
sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
|
|
sb->s_max_links = EXT2_LINK_MAX;
|
|
|
|
if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
|
|
sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
|
|
sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
|
|
} else {
|
|
sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
|
|
sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
|
|
if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
|
|
!is_power_of_2(sbi->s_inode_size) ||
|
|
(sbi->s_inode_size > blocksize)) {
|
|
ext2_msg(sb, KERN_ERR,
|
|
"error: unsupported inode size: %d",
|
|
sbi->s_inode_size);
|
|
goto failed_mount;
|
|
}
|
|
}
|
|
|
|
sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
|
|
le32_to_cpu(es->s_log_frag_size);
|
|
if (sbi->s_frag_size == 0)
|
|
goto cantfind_ext2;
|
|
sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
|
|
|
|
sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
|
|
sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
|
|
sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
|
|
|
|
if (EXT2_INODE_SIZE(sb) == 0)
|
|
goto cantfind_ext2;
|
|
sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
|
|
if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
|
|
goto cantfind_ext2;
|
|
sbi->s_itb_per_group = sbi->s_inodes_per_group /
|
|
sbi->s_inodes_per_block;
|
|
sbi->s_desc_per_block = sb->s_blocksize /
|
|
sizeof (struct ext2_group_desc);
|
|
sbi->s_sbh = bh;
|
|
sbi->s_mount_state = le16_to_cpu(es->s_state);
|
|
sbi->s_addr_per_block_bits =
|
|
ilog2 (EXT2_ADDR_PER_BLOCK(sb));
|
|
sbi->s_desc_per_block_bits =
|
|
ilog2 (EXT2_DESC_PER_BLOCK(sb));
|
|
|
|
if (sb->s_magic != EXT2_SUPER_MAGIC)
|
|
goto cantfind_ext2;
|
|
|
|
if (sb->s_blocksize != bh->b_size) {
|
|
if (!silent)
|
|
ext2_msg(sb, KERN_ERR, "error: unsupported blocksize");
|
|
goto failed_mount;
|
|
}
|
|
|
|
if (sb->s_blocksize != sbi->s_frag_size) {
|
|
ext2_msg(sb, KERN_ERR,
|
|
"error: fragsize %lu != blocksize %lu"
|
|
"(not supported yet)",
|
|
sbi->s_frag_size, sb->s_blocksize);
|
|
goto failed_mount;
|
|
}
|
|
|
|
if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
|
|
ext2_msg(sb, KERN_ERR,
|
|
"error: #blocks per group too big: %lu",
|
|
sbi->s_blocks_per_group);
|
|
goto failed_mount;
|
|
}
|
|
if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
|
|
ext2_msg(sb, KERN_ERR,
|
|
"error: #fragments per group too big: %lu",
|
|
sbi->s_frags_per_group);
|
|
goto failed_mount;
|
|
}
|
|
if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
|
|
ext2_msg(sb, KERN_ERR,
|
|
"error: #inodes per group too big: %lu",
|
|
sbi->s_inodes_per_group);
|
|
goto failed_mount;
|
|
}
|
|
|
|
if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
|
|
goto cantfind_ext2;
|
|
sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
|
|
le32_to_cpu(es->s_first_data_block) - 1)
|
|
/ EXT2_BLOCKS_PER_GROUP(sb)) + 1;
|
|
db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
|
|
EXT2_DESC_PER_BLOCK(sb);
|
|
sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
|
|
if (sbi->s_group_desc == NULL) {
|
|
ext2_msg(sb, KERN_ERR, "error: not enough memory");
|
|
goto failed_mount;
|
|
}
|
|
bgl_lock_init(sbi->s_blockgroup_lock);
|
|
sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
|
|
if (!sbi->s_debts) {
|
|
ext2_msg(sb, KERN_ERR, "error: not enough memory");
|
|
goto failed_mount_group_desc;
|
|
}
|
|
for (i = 0; i < db_count; i++) {
|
|
block = descriptor_loc(sb, logic_sb_block, i);
|
|
sbi->s_group_desc[i] = sb_bread(sb, block);
|
|
if (!sbi->s_group_desc[i]) {
|
|
for (j = 0; j < i; j++)
|
|
brelse (sbi->s_group_desc[j]);
|
|
ext2_msg(sb, KERN_ERR,
|
|
"error: unable to read group descriptors");
|
|
goto failed_mount_group_desc;
|
|
}
|
|
}
|
|
if (!ext2_check_descriptors (sb)) {
|
|
ext2_msg(sb, KERN_ERR, "group descriptors corrupted");
|
|
goto failed_mount2;
|
|
}
|
|
sbi->s_gdb_count = db_count;
|
|
get_random_bytes(&sbi->s_next_generation, sizeof(u32));
|
|
spin_lock_init(&sbi->s_next_gen_lock);
|
|
|
|
/* per fileystem reservation list head & lock */
|
|
spin_lock_init(&sbi->s_rsv_window_lock);
|
|
sbi->s_rsv_window_root = RB_ROOT;
|
|
/*
|
|
* Add a single, static dummy reservation to the start of the
|
|
* reservation window list --- it gives us a placeholder for
|
|
* append-at-start-of-list which makes the allocation logic
|
|
* _much_ simpler.
|
|
*/
|
|
sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
|
|
sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
|
|
sbi->s_rsv_window_head.rsv_alloc_hit = 0;
|
|
sbi->s_rsv_window_head.rsv_goal_size = 0;
|
|
ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);
|
|
|
|
err = percpu_counter_init(&sbi->s_freeblocks_counter,
|
|
ext2_count_free_blocks(sb));
|
|
if (!err) {
|
|
err = percpu_counter_init(&sbi->s_freeinodes_counter,
|
|
ext2_count_free_inodes(sb));
|
|
}
|
|
if (!err) {
|
|
err = percpu_counter_init(&sbi->s_dirs_counter,
|
|
ext2_count_dirs(sb));
|
|
}
|
|
if (err) {
|
|
ext2_msg(sb, KERN_ERR, "error: insufficient memory");
|
|
goto failed_mount3;
|
|
}
|
|
/*
|
|
* set up enough so that it can read an inode
|
|
*/
|
|
sb->s_op = &ext2_sops;
|
|
sb->s_export_op = &ext2_export_ops;
|
|
sb->s_xattr = ext2_xattr_handlers;
|
|
|
|
#ifdef CONFIG_QUOTA
|
|
sb->dq_op = &dquot_operations;
|
|
sb->s_qcop = &dquot_quotactl_ops;
|
|
#endif
|
|
|
|
root = ext2_iget(sb, EXT2_ROOT_INO);
|
|
if (IS_ERR(root)) {
|
|
ret = PTR_ERR(root);
|
|
goto failed_mount3;
|
|
}
|
|
if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
|
|
iput(root);
|
|
ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
|
|
goto failed_mount3;
|
|
}
|
|
|
|
sb->s_root = d_make_root(root);
|
|
if (!sb->s_root) {
|
|
ext2_msg(sb, KERN_ERR, "error: get root inode failed");
|
|
ret = -ENOMEM;
|
|
goto failed_mount3;
|
|
}
|
|
if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
|
|
ext2_msg(sb, KERN_WARNING,
|
|
"warning: mounting ext3 filesystem as ext2");
|
|
if (ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY))
|
|
sb->s_flags |= MS_RDONLY;
|
|
ext2_write_super(sb);
|
|
return 0;
|
|
|
|
cantfind_ext2:
|
|
if (!silent)
|
|
ext2_msg(sb, KERN_ERR,
|
|
"error: can't find an ext2 filesystem on dev %s.",
|
|
sb->s_id);
|
|
goto failed_mount;
|
|
failed_mount3:
|
|
percpu_counter_destroy(&sbi->s_freeblocks_counter);
|
|
percpu_counter_destroy(&sbi->s_freeinodes_counter);
|
|
percpu_counter_destroy(&sbi->s_dirs_counter);
|
|
failed_mount2:
|
|
for (i = 0; i < db_count; i++)
|
|
brelse(sbi->s_group_desc[i]);
|
|
failed_mount_group_desc:
|
|
kfree(sbi->s_group_desc);
|
|
kfree(sbi->s_debts);
|
|
failed_mount:
|
|
brelse(bh);
|
|
failed_sbi:
|
|
sb->s_fs_info = NULL;
|
|
kfree(sbi->s_blockgroup_lock);
|
|
kfree(sbi);
|
|
failed_unlock:
|
|
return ret;
|
|
}
|
|
|
|
static void ext2_clear_super_error(struct super_block *sb)
|
|
{
|
|
struct buffer_head *sbh = EXT2_SB(sb)->s_sbh;
|
|
|
|
if (buffer_write_io_error(sbh)) {
|
|
/*
|
|
* Oh, dear. A previous attempt to write the
|
|
* superblock failed. This could happen because the
|
|
* USB device was yanked out. Or it could happen to
|
|
* be a transient write error and maybe the block will
|
|
* be remapped. Nothing we can do but to retry the
|
|
* write and hope for the best.
|
|
*/
|
|
ext2_msg(sb, KERN_ERR,
|
|
"previous I/O error to superblock detected\n");
|
|
clear_buffer_write_io_error(sbh);
|
|
set_buffer_uptodate(sbh);
|
|
}
|
|
}
|
|
|
|
static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
|
|
int wait)
|
|
{
|
|
ext2_clear_super_error(sb);
|
|
spin_lock(&EXT2_SB(sb)->s_lock);
|
|
es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
|
|
es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
|
|
es->s_wtime = cpu_to_le32(get_seconds());
|
|
/* unlock before we do IO */
|
|
spin_unlock(&EXT2_SB(sb)->s_lock);
|
|
mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
|
|
if (wait)
|
|
sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
|
|
}
|
|
|
|
/*
|
|
* In the second extended file system, it is not necessary to
|
|
* write the super block since we use a mapping of the
|
|
* disk super block in a buffer.
|
|
*
|
|
* However, this function is still used to set the fs valid
|
|
* flags to 0. We need to set this flag to 0 since the fs
|
|
* may have been checked while mounted and e2fsck may have
|
|
* set s_state to EXT2_VALID_FS after some corrections.
|
|
*/
|
|
static int ext2_sync_fs(struct super_block *sb, int wait)
|
|
{
|
|
struct ext2_sb_info *sbi = EXT2_SB(sb);
|
|
struct ext2_super_block *es = EXT2_SB(sb)->s_es;
|
|
|
|
spin_lock(&sbi->s_lock);
|
|
if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
|
|
ext2_debug("setting valid to 0\n");
|
|
es->s_state &= cpu_to_le16(~EXT2_VALID_FS);
|
|
}
|
|
spin_unlock(&sbi->s_lock);
|
|
ext2_sync_super(sb, es, wait);
|
|
return 0;
|
|
}
|
|
|
|
|
|
void ext2_write_super(struct super_block *sb)
|
|
{
|
|
if (!(sb->s_flags & MS_RDONLY))
|
|
ext2_sync_fs(sb, 1);
|
|
}
|
|
|
|
static int ext2_remount (struct super_block * sb, int * flags, char * data)
|
|
{
|
|
struct ext2_sb_info * sbi = EXT2_SB(sb);
|
|
struct ext2_super_block * es;
|
|
unsigned long old_mount_opt = sbi->s_mount_opt;
|
|
struct ext2_mount_options old_opts;
|
|
unsigned long old_sb_flags;
|
|
int err;
|
|
|
|
spin_lock(&sbi->s_lock);
|
|
|
|
/* Store the old options */
|
|
old_sb_flags = sb->s_flags;
|
|
old_opts.s_mount_opt = sbi->s_mount_opt;
|
|
old_opts.s_resuid = sbi->s_resuid;
|
|
old_opts.s_resgid = sbi->s_resgid;
|
|
|
|
/*
|
|
* Allow the "check" option to be passed as a remount option.
|
|
*/
|
|
if (!parse_options(data, sb)) {
|
|
err = -EINVAL;
|
|
goto restore_opts;
|
|
}
|
|
|
|
sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
|
|
((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
|
|
|
|
ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
|
|
EXT2_MOUNT_XIP if not */
|
|
|
|
if ((ext2_use_xip(sb)) && (sb->s_blocksize != PAGE_SIZE)) {
|
|
ext2_msg(sb, KERN_WARNING,
|
|
"warning: unsupported blocksize for xip");
|
|
err = -EINVAL;
|
|
goto restore_opts;
|
|
}
|
|
|
|
es = sbi->s_es;
|
|
if ((sbi->s_mount_opt ^ old_mount_opt) & EXT2_MOUNT_XIP) {
|
|
ext2_msg(sb, KERN_WARNING, "warning: refusing change of "
|
|
"xip flag with busy inodes while remounting");
|
|
sbi->s_mount_opt &= ~EXT2_MOUNT_XIP;
|
|
sbi->s_mount_opt |= old_mount_opt & EXT2_MOUNT_XIP;
|
|
}
|
|
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
|
|
spin_unlock(&sbi->s_lock);
|
|
return 0;
|
|
}
|
|
if (*flags & MS_RDONLY) {
|
|
if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
|
|
!(sbi->s_mount_state & EXT2_VALID_FS)) {
|
|
spin_unlock(&sbi->s_lock);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* OK, we are remounting a valid rw partition rdonly, so set
|
|
* the rdonly flag and then mark the partition as valid again.
|
|
*/
|
|
es->s_state = cpu_to_le16(sbi->s_mount_state);
|
|
es->s_mtime = cpu_to_le32(get_seconds());
|
|
spin_unlock(&sbi->s_lock);
|
|
|
|
err = dquot_suspend(sb, -1);
|
|
if (err < 0) {
|
|
spin_lock(&sbi->s_lock);
|
|
goto restore_opts;
|
|
}
|
|
|
|
ext2_sync_super(sb, es, 1);
|
|
} else {
|
|
__le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
|
|
~EXT2_FEATURE_RO_COMPAT_SUPP);
|
|
if (ret) {
|
|
ext2_msg(sb, KERN_WARNING,
|
|
"warning: couldn't remount RDWR because of "
|
|
"unsupported optional features (%x).",
|
|
le32_to_cpu(ret));
|
|
err = -EROFS;
|
|
goto restore_opts;
|
|
}
|
|
/*
|
|
* Mounting a RDONLY partition read-write, so reread and
|
|
* store the current valid flag. (It may have been changed
|
|
* by e2fsck since we originally mounted the partition.)
|
|
*/
|
|
sbi->s_mount_state = le16_to_cpu(es->s_state);
|
|
if (!ext2_setup_super (sb, es, 0))
|
|
sb->s_flags &= ~MS_RDONLY;
|
|
spin_unlock(&sbi->s_lock);
|
|
|
|
ext2_write_super(sb);
|
|
|
|
dquot_resume(sb, -1);
|
|
}
|
|
|
|
return 0;
|
|
restore_opts:
|
|
sbi->s_mount_opt = old_opts.s_mount_opt;
|
|
sbi->s_resuid = old_opts.s_resuid;
|
|
sbi->s_resgid = old_opts.s_resgid;
|
|
sb->s_flags = old_sb_flags;
|
|
spin_unlock(&sbi->s_lock);
|
|
return err;
|
|
}
|
|
|
|
static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
|
|
{
|
|
struct super_block *sb = dentry->d_sb;
|
|
struct ext2_sb_info *sbi = EXT2_SB(sb);
|
|
struct ext2_super_block *es = sbi->s_es;
|
|
u64 fsid;
|
|
|
|
spin_lock(&sbi->s_lock);
|
|
|
|
if (test_opt (sb, MINIX_DF))
|
|
sbi->s_overhead_last = 0;
|
|
else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
|
|
unsigned long i, overhead = 0;
|
|
smp_rmb();
|
|
|
|
/*
|
|
* Compute the overhead (FS structures). This is constant
|
|
* for a given filesystem unless the number of block groups
|
|
* changes so we cache the previous value until it does.
|
|
*/
|
|
|
|
/*
|
|
* All of the blocks before first_data_block are
|
|
* overhead
|
|
*/
|
|
overhead = le32_to_cpu(es->s_first_data_block);
|
|
|
|
/*
|
|
* Add the overhead attributed to the superblock and
|
|
* block group descriptors. If the sparse superblocks
|
|
* feature is turned on, then not all groups have this.
|
|
*/
|
|
for (i = 0; i < sbi->s_groups_count; i++)
|
|
overhead += ext2_bg_has_super(sb, i) +
|
|
ext2_bg_num_gdb(sb, i);
|
|
|
|
/*
|
|
* Every block group has an inode bitmap, a block
|
|
* bitmap, and an inode table.
|
|
*/
|
|
overhead += (sbi->s_groups_count *
|
|
(2 + sbi->s_itb_per_group));
|
|
sbi->s_overhead_last = overhead;
|
|
smp_wmb();
|
|
sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
|
|
}
|
|
|
|
buf->f_type = EXT2_SUPER_MAGIC;
|
|
buf->f_bsize = sb->s_blocksize;
|
|
buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
|
|
buf->f_bfree = ext2_count_free_blocks(sb);
|
|
es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
|
|
buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
|
|
if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
|
|
buf->f_bavail = 0;
|
|
buf->f_files = le32_to_cpu(es->s_inodes_count);
|
|
buf->f_ffree = ext2_count_free_inodes(sb);
|
|
es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
|
|
buf->f_namelen = EXT2_NAME_LEN;
|
|
fsid = le64_to_cpup((void *)es->s_uuid) ^
|
|
le64_to_cpup((void *)es->s_uuid + sizeof(u64));
|
|
buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
|
|
buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
|
|
spin_unlock(&sbi->s_lock);
|
|
return 0;
|
|
}
|
|
|
|
static struct dentry *ext2_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super);
|
|
}
|
|
|
|
#ifdef CONFIG_QUOTA
|
|
|
|
/* Read data from quotafile - avoid pagecache and such because we cannot afford
|
|
* acquiring the locks... As quota files are never truncated and quota code
|
|
* itself serializes the operations (and no one else should touch the files)
|
|
* we don't have to be afraid of races */
|
|
static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
|
|
size_t len, loff_t off)
|
|
{
|
|
struct inode *inode = sb_dqopt(sb)->files[type];
|
|
sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
|
|
int err = 0;
|
|
int offset = off & (sb->s_blocksize - 1);
|
|
int tocopy;
|
|
size_t toread;
|
|
struct buffer_head tmp_bh;
|
|
struct buffer_head *bh;
|
|
loff_t i_size = i_size_read(inode);
|
|
|
|
if (off > i_size)
|
|
return 0;
|
|
if (off+len > i_size)
|
|
len = i_size-off;
|
|
toread = len;
|
|
while (toread > 0) {
|
|
tocopy = sb->s_blocksize - offset < toread ?
|
|
sb->s_blocksize - offset : toread;
|
|
|
|
tmp_bh.b_state = 0;
|
|
tmp_bh.b_size = sb->s_blocksize;
|
|
err = ext2_get_block(inode, blk, &tmp_bh, 0);
|
|
if (err < 0)
|
|
return err;
|
|
if (!buffer_mapped(&tmp_bh)) /* A hole? */
|
|
memset(data, 0, tocopy);
|
|
else {
|
|
bh = sb_bread(sb, tmp_bh.b_blocknr);
|
|
if (!bh)
|
|
return -EIO;
|
|
memcpy(data, bh->b_data+offset, tocopy);
|
|
brelse(bh);
|
|
}
|
|
offset = 0;
|
|
toread -= tocopy;
|
|
data += tocopy;
|
|
blk++;
|
|
}
|
|
return len;
|
|
}
|
|
|
|
/* Write to quotafile */
|
|
static ssize_t ext2_quota_write(struct super_block *sb, int type,
|
|
const char *data, size_t len, loff_t off)
|
|
{
|
|
struct inode *inode = sb_dqopt(sb)->files[type];
|
|
sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
|
|
int err = 0;
|
|
int offset = off & (sb->s_blocksize - 1);
|
|
int tocopy;
|
|
size_t towrite = len;
|
|
struct buffer_head tmp_bh;
|
|
struct buffer_head *bh;
|
|
|
|
while (towrite > 0) {
|
|
tocopy = sb->s_blocksize - offset < towrite ?
|
|
sb->s_blocksize - offset : towrite;
|
|
|
|
tmp_bh.b_state = 0;
|
|
err = ext2_get_block(inode, blk, &tmp_bh, 1);
|
|
if (err < 0)
|
|
goto out;
|
|
if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
|
|
bh = sb_bread(sb, tmp_bh.b_blocknr);
|
|
else
|
|
bh = sb_getblk(sb, tmp_bh.b_blocknr);
|
|
if (!bh) {
|
|
err = -EIO;
|
|
goto out;
|
|
}
|
|
lock_buffer(bh);
|
|
memcpy(bh->b_data+offset, data, tocopy);
|
|
flush_dcache_page(bh->b_page);
|
|
set_buffer_uptodate(bh);
|
|
mark_buffer_dirty(bh);
|
|
unlock_buffer(bh);
|
|
brelse(bh);
|
|
offset = 0;
|
|
towrite -= tocopy;
|
|
data += tocopy;
|
|
blk++;
|
|
}
|
|
out:
|
|
if (len == towrite)
|
|
return err;
|
|
if (inode->i_size < off+len-towrite)
|
|
i_size_write(inode, off+len-towrite);
|
|
inode->i_version++;
|
|
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
|
mark_inode_dirty(inode);
|
|
return len - towrite;
|
|
}
|
|
|
|
#endif
|
|
|
|
static struct file_system_type ext2_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "ext2",
|
|
.mount = ext2_mount,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
|
|
static int __init init_ext2_fs(void)
|
|
{
|
|
int err = init_ext2_xattr();
|
|
if (err)
|
|
return err;
|
|
err = init_inodecache();
|
|
if (err)
|
|
goto out1;
|
|
err = register_filesystem(&ext2_fs_type);
|
|
if (err)
|
|
goto out;
|
|
return 0;
|
|
out:
|
|
destroy_inodecache();
|
|
out1:
|
|
exit_ext2_xattr();
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_ext2_fs(void)
|
|
{
|
|
unregister_filesystem(&ext2_fs_type);
|
|
destroy_inodecache();
|
|
exit_ext2_xattr();
|
|
}
|
|
|
|
MODULE_AUTHOR("Remy Card and others");
|
|
MODULE_DESCRIPTION("Second Extended Filesystem");
|
|
MODULE_LICENSE("GPL");
|
|
module_init(init_ext2_fs)
|
|
module_exit(exit_ext2_fs)
|