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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * linux/fs/ext2/super.c
- *
- * Copyright (C) 1992, 1993, 1994, 1995
- * Remy Card ([email protected])
- * 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 ([email protected]), 1995
- */
- #include <linux/module.h>
- #include <linux/string.h>
- #include <linux/fs.h>
- #include <linux/slab.h>
- #include <linux/init.h>
- #include <linux/blkdev.h>
- #include <linux/parser.h>
- #include <linux/random.h>
- #include <linux/buffer_head.h>
- #include <linux/exportfs.h>
- #include <linux/vfs.h>
- #include <linux/seq_file.h>
- #include <linux/mount.h>
- #include <linux/log2.h>
- #include <linux/quotaops.h>
- #include <linux/uaccess.h>
- #include <linux/dax.h>
- #include <linux/iversion.h>
- #include "ext2.h"
- #include "xattr.h"
- #include "acl.h"
- static void ext2_write_super(struct super_block *sb);
- static int ext2_remount (struct super_block * sb, int * flags, char * data);
- static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
- static int ext2_sync_fs(struct super_block *sb, int wait);
- static int ext2_freeze(struct super_block *sb);
- static int ext2_unfreeze(struct super_block *sb);
- void ext2_error(struct super_block *sb, const char *function,
- const char *fmt, ...)
- {
- struct va_format vaf;
- va_list args;
- struct ext2_sb_info *sbi = EXT2_SB(sb);
- struct ext2_super_block *es = sbi->s_es;
- if (!sb_rdonly(sb)) {
- spin_lock(&sbi->s_lock);
- sbi->s_mount_state |= EXT2_ERROR_FS;
- es->s_state |= cpu_to_le16(EXT2_ERROR_FS);
- spin_unlock(&sbi->s_lock);
- ext2_sync_super(sb, es, 1);
- }
- va_start(args, fmt);
- vaf.fmt = fmt;
- vaf.va = &args;
- printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n",
- sb->s_id, function, &vaf);
- va_end(args);
- if (test_opt(sb, ERRORS_PANIC))
- panic("EXT2-fs: panic from previous error\n");
- if (!sb_rdonly(sb) && test_opt(sb, ERRORS_RO)) {
- ext2_msg(sb, KERN_CRIT,
- "error: remounting filesystem read-only");
- sb->s_flags |= SB_RDONLY;
- }
- }
- void ext2_msg(struct super_block *sb, const char *prefix,
- const char *fmt, ...)
- {
- struct va_format vaf;
- va_list args;
- va_start(args, fmt);
- vaf.fmt = fmt;
- vaf.va = &args;
- printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
- va_end(args);
- }
- /*
- * This must be called with sbi->s_lock held.
- */
- void ext2_update_dynamic_rev(struct super_block *sb)
- {
- struct ext2_super_block *es = EXT2_SB(sb)->s_es;
- if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV)
- return;
- ext2_msg(sb, KERN_WARNING,
- "warning: updating to rev %d because of "
- "new feature flag, running e2fsck is recommended",
- EXT2_DYNAMIC_REV);
- es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO);
- es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE);
- es->s_rev_level = cpu_to_le32(EXT2_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.
- */
- }
- #ifdef CONFIG_QUOTA
- static int ext2_quota_off(struct super_block *sb, int type);
- static void ext2_quota_off_umount(struct super_block *sb)
- {
- int type;
- for (type = 0; type < MAXQUOTAS; type++)
- ext2_quota_off(sb, type);
- }
- #else
- static inline void ext2_quota_off_umount(struct super_block *sb)
- {
- }
- #endif
- static void ext2_put_super (struct super_block * sb)
- {
- int db_count;
- int i;
- struct ext2_sb_info *sbi = EXT2_SB(sb);
- ext2_quota_off_umount(sb);
- ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
- sbi->s_ea_block_cache = NULL;
- if (!sb_rdonly(sb)) {
- struct ext2_super_block *es = sbi->s_es;
- spin_lock(&sbi->s_lock);
- es->s_state = cpu_to_le16(sbi->s_mount_state);
- spin_unlock(&sbi->s_lock);
- ext2_sync_super(sb, es, 1);
- }
- db_count = sbi->s_gdb_count;
- for (i = 0; i < db_count; i++)
- brelse(sbi->s_group_desc[i]);
- kvfree(sbi->s_group_desc);
- kfree(sbi->s_debts);
- percpu_counter_destroy(&sbi->s_freeblocks_counter);
- percpu_counter_destroy(&sbi->s_freeinodes_counter);
- percpu_counter_destroy(&sbi->s_dirs_counter);
- brelse (sbi->s_sbh);
- sb->s_fs_info = NULL;
- kfree(sbi->s_blockgroup_lock);
- fs_put_dax(sbi->s_daxdev, NULL);
- kfree(sbi);
- }
- static struct kmem_cache * ext2_inode_cachep;
- static struct inode *ext2_alloc_inode(struct super_block *sb)
- {
- struct ext2_inode_info *ei;
- ei = alloc_inode_sb(sb, ext2_inode_cachep, GFP_KERNEL);
- if (!ei)
- return NULL;
- ei->i_block_alloc_info = NULL;
- inode_set_iversion(&ei->vfs_inode, 1);
- #ifdef CONFIG_QUOTA
- memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
- #endif
- return &ei->vfs_inode;
- }
- static void ext2_free_in_core_inode(struct inode *inode)
- {
- kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
- }
- static void init_once(void *foo)
- {
- struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
- rwlock_init(&ei->i_meta_lock);
- #ifdef CONFIG_EXT2_FS_XATTR
- init_rwsem(&ei->xattr_sem);
- #endif
- mutex_init(&ei->truncate_mutex);
- inode_init_once(&ei->vfs_inode);
- }
- static int __init init_inodecache(void)
- {
- ext2_inode_cachep = kmem_cache_create_usercopy("ext2_inode_cache",
- sizeof(struct ext2_inode_info), 0,
- (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
- SLAB_ACCOUNT),
- offsetof(struct ext2_inode_info, i_data),
- sizeof_field(struct ext2_inode_info, i_data),
- init_once);
- if (ext2_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(ext2_inode_cachep);
- }
- static int ext2_show_options(struct seq_file *seq, struct dentry *root)
- {
- struct super_block *sb = root->d_sb;
- struct ext2_sb_info *sbi = EXT2_SB(sb);
- struct ext2_super_block *es = sbi->s_es;
- unsigned long def_mount_opts;
- spin_lock(&sbi->s_lock);
- def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
- if (sbi->s_sb_block != 1)
- seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
- if (test_opt(sb, MINIX_DF))
- seq_puts(seq, ",minixdf");
- if (test_opt(sb, GRPID))
- seq_puts(seq, ",grpid");
- if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS))
- seq_puts(seq, ",nogrpid");
- if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) ||
- le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) {
- seq_printf(seq, ",resuid=%u",
- from_kuid_munged(&init_user_ns, sbi->s_resuid));
- }
- if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) ||
- le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) {
- seq_printf(seq, ",resgid=%u",
- from_kgid_munged(&init_user_ns, sbi->s_resgid));
- }
- if (test_opt(sb, ERRORS_RO)) {
- int def_errors = le16_to_cpu(es->s_errors);
- if (def_errors == EXT2_ERRORS_PANIC ||
- def_errors == EXT2_ERRORS_CONTINUE) {
- seq_puts(seq, ",errors=remount-ro");
- }
- }
- if (test_opt(sb, ERRORS_CONT))
- seq_puts(seq, ",errors=continue");
- if (test_opt(sb, ERRORS_PANIC))
- seq_puts(seq, ",errors=panic");
- if (test_opt(sb, NO_UID32))
- seq_puts(seq, ",nouid32");
- if (test_opt(sb, DEBUG))
- seq_puts(seq, ",debug");
- if (test_opt(sb, OLDALLOC))
- seq_puts(seq, ",oldalloc");
- #ifdef CONFIG_EXT2_FS_XATTR
- if (test_opt(sb, XATTR_USER))
- seq_puts(seq, ",user_xattr");
- if (!test_opt(sb, XATTR_USER) &&
- (def_mount_opts & EXT2_DEFM_XATTR_USER)) {
- seq_puts(seq, ",nouser_xattr");
- }
- #endif
- #ifdef CONFIG_EXT2_FS_POSIX_ACL
- if (test_opt(sb, POSIX_ACL))
- seq_puts(seq, ",acl");
- if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL))
- seq_puts(seq, ",noacl");
- #endif
- if (test_opt(sb, USRQUOTA))
- seq_puts(seq, ",usrquota");
- if (test_opt(sb, GRPQUOTA))
- seq_puts(seq, ",grpquota");
- if (test_opt(sb, XIP))
- seq_puts(seq, ",xip");
- if (test_opt(sb, DAX))
- seq_puts(seq, ",dax");
- if (!test_opt(sb, RESERVATION))
- seq_puts(seq, ",noreservation");
- spin_unlock(&sbi->s_lock);
- return 0;
- }
- #ifdef CONFIG_QUOTA
- static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
- static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
- static int ext2_quota_on(struct super_block *sb, int type, int format_id,
- const struct path *path);
- static struct dquot **ext2_get_dquots(struct inode *inode)
- {
- return EXT2_I(inode)->i_dquot;
- }
- static const struct quotactl_ops ext2_quotactl_ops = {
- .quota_on = ext2_quota_on,
- .quota_off = ext2_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 ext2_sops = {
- .alloc_inode = ext2_alloc_inode,
- .free_inode = ext2_free_in_core_inode,
- .write_inode = ext2_write_inode,
- .evict_inode = ext2_evict_inode,
- .put_super = ext2_put_super,
- .sync_fs = ext2_sync_fs,
- .freeze_fs = ext2_freeze,
- .unfreeze_fs = ext2_unfreeze,
- .statfs = ext2_statfs,
- .remount_fs = ext2_remount,
- .show_options = ext2_show_options,
- #ifdef CONFIG_QUOTA
- .quota_read = ext2_quota_read,
- .quota_write = ext2_quota_write,
- .get_dquots = ext2_get_dquots,
- #endif
- };
- static struct inode *ext2_nfs_get_inode(struct super_block *sb,
- u64 ino, u32 generation)
- {
- struct inode *inode;
- if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
- return ERR_PTR(-ESTALE);
- if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
- return ERR_PTR(-ESTALE);
- /*
- * ext2_iget isn't quite right if the inode is currently unallocated!
- * However ext2_iget currently does appropriate checks to handle stale
- * inodes so everything is OK.
- */
- inode = ext2_iget(sb, ino);
- if (IS_ERR(inode))
- return ERR_CAST(inode);
- if (generation && inode->i_generation != generation) {
- /* we didn't find the right inode.. */
- iput(inode);
- return ERR_PTR(-ESTALE);
- }
- return inode;
- }
- static struct dentry *ext2_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,
- ext2_nfs_get_inode);
- }
- static struct dentry *ext2_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,
- ext2_nfs_get_inode);
- }
- static const struct export_operations ext2_export_ops = {
- .fh_to_dentry = ext2_fh_to_dentry,
- .fh_to_parent = ext2_fh_to_parent,
- .get_parent = ext2_get_parent,
- };
- static unsigned long get_sb_block(void **data)
- {
- unsigned long sb_block;
- char *options = (char *) *data;
- if (!options || strncmp(options, "sb=", 3) != 0)
- return 1; /* Default location */
- options += 3;
- sb_block = simple_strtoul(options, &options, 0);
- if (*options && *options != ',') {
- printk("EXT2-fs: Invalid sb specification: %s\n",
- (char *) *data);
- return 1;
- }
- if (*options == ',')
- options++;
- *data = (void *) options;
- return sb_block;
- }
- enum {
- Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
- Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
- Opt_err_ro, Opt_nouid32, Opt_debug,
- Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
- Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota,
- Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
- };
- static const match_table_t tokens = {
- {Opt_bsd_df, "bsddf"},
- {Opt_minix_df, "minixdf"},
- {Opt_grpid, "grpid"},
- {Opt_grpid, "bsdgroups"},
- {Opt_nogrpid, "nogrpid"},
- {Opt_nogrpid, "sysvgroups"},
- {Opt_resgid, "resgid=%u"},
- {Opt_resuid, "resuid=%u"},
- {Opt_sb, "sb=%u"},
- {Opt_err_cont, "errors=continue"},
- {Opt_err_panic, "errors=panic"},
- {Opt_err_ro, "errors=remount-ro"},
- {Opt_nouid32, "nouid32"},
- {Opt_debug, "debug"},
- {Opt_oldalloc, "oldalloc"},
- {Opt_orlov, "orlov"},
- {Opt_nobh, "nobh"},
- {Opt_user_xattr, "user_xattr"},
- {Opt_nouser_xattr, "nouser_xattr"},
- {Opt_acl, "acl"},
- {Opt_noacl, "noacl"},
- {Opt_xip, "xip"},
- {Opt_dax, "dax"},
- {Opt_grpquota, "grpquota"},
- {Opt_ignore, "noquota"},
- {Opt_quota, "quota"},
- {Opt_usrquota, "usrquota"},
- {Opt_reservation, "reservation"},
- {Opt_noreservation, "noreservation"},
- {Opt_err, NULL}
- };
- static int parse_options(char *options, struct super_block *sb,
- struct ext2_mount_options *opts)
- {
- char *p;
- substring_t args[MAX_OPT_ARGS];
- int option;
- kuid_t uid;
- kgid_t gid;
- if (!options)
- return 1;
- while ((p = strsep (&options, ",")) != NULL) {
- int token;
- if (!*p)
- continue;
- token = match_token(p, tokens, args);
- switch (token) {
- case Opt_bsd_df:
- clear_opt (opts->s_mount_opt, MINIX_DF);
- break;
- case Opt_minix_df:
- set_opt (opts->s_mount_opt, MINIX_DF);
- break;
- case Opt_grpid:
- set_opt (opts->s_mount_opt, GRPID);
- break;
- case Opt_nogrpid:
- clear_opt (opts->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 0;
- }
- opts->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 0;
- }
- opts->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 (opts->s_mount_opt, ERRORS_CONT);
- clear_opt (opts->s_mount_opt, ERRORS_RO);
- set_opt (opts->s_mount_opt, ERRORS_PANIC);
- break;
- case Opt_err_ro:
- clear_opt (opts->s_mount_opt, ERRORS_CONT);
- clear_opt (opts->s_mount_opt, ERRORS_PANIC);
- set_opt (opts->s_mount_opt, ERRORS_RO);
- break;
- case Opt_err_cont:
- clear_opt (opts->s_mount_opt, ERRORS_RO);
- clear_opt (opts->s_mount_opt, ERRORS_PANIC);
- set_opt (opts->s_mount_opt, ERRORS_CONT);
- break;
- case Opt_nouid32:
- set_opt (opts->s_mount_opt, NO_UID32);
- break;
- case Opt_debug:
- set_opt (opts->s_mount_opt, DEBUG);
- break;
- case Opt_oldalloc:
- set_opt (opts->s_mount_opt, OLDALLOC);
- break;
- case Opt_orlov:
- clear_opt (opts->s_mount_opt, OLDALLOC);
- break;
- case Opt_nobh:
- ext2_msg(sb, KERN_INFO,
- "nobh option not supported");
- break;
- #ifdef CONFIG_EXT2_FS_XATTR
- case Opt_user_xattr:
- set_opt (opts->s_mount_opt, XATTR_USER);
- break;
- case Opt_nouser_xattr:
- clear_opt (opts->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(opts->s_mount_opt, POSIX_ACL);
- break;
- case Opt_noacl:
- clear_opt(opts->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:
- ext2_msg(sb, KERN_INFO, "use dax instead of xip");
- set_opt(opts->s_mount_opt, XIP);
- fallthrough;
- case Opt_dax:
- #ifdef CONFIG_FS_DAX
- ext2_msg(sb, KERN_WARNING,
- "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
- set_opt(opts->s_mount_opt, DAX);
- #else
- ext2_msg(sb, KERN_INFO, "dax option not supported");
- #endif
- break;
- #if defined(CONFIG_QUOTA)
- case Opt_quota:
- case Opt_usrquota:
- set_opt(opts->s_mount_opt, USRQUOTA);
- break;
- case Opt_grpquota:
- set_opt(opts->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(opts->s_mount_opt, RESERVATION);
- ext2_msg(sb, KERN_INFO, "reservations ON");
- break;
- case Opt_noreservation:
- clear_opt(opts->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 = SB_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) <=
- ktime_get_real_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, gc=%lu, "
- "bpg=%lu, ipg=%lu, mo=%04lx]",
- EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
- 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 = ext2_group_last_block_no(sb, i);
- 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;
- unsigned int upper_limit;
- unsigned int ppb = 1 << (bits-2);
- /* 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);
- /* Compute how many blocks we can address by block tree */
- res += 1LL << (bits-2);
- res += 1LL << (2*(bits-2));
- res += 1LL << (3*(bits-2));
- /* Compute how many metadata blocks are needed */
- meta_blocks = 1;
- meta_blocks += 1 + ppb;
- meta_blocks += 1 + ppb + ppb * ppb;
- /* Does block tree limit file size? */
- if (res + meta_blocks <= upper_limit)
- goto check_lfs;
- res = upper_limit;
- /* How many metadata blocks are needed for addressing upper_limit? */
- upper_limit -= EXT2_NDIR_BLOCKS;
- /* indirect blocks */
- meta_blocks = 1;
- upper_limit -= ppb;
- /* double indirect blocks */
- if (upper_limit < ppb * ppb) {
- meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb);
- res -= meta_blocks;
- goto check_lfs;
- }
- meta_blocks += 1 + ppb;
- upper_limit -= ppb * ppb;
- /* tripple indirect blocks for the rest */
- meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb) +
- DIV_ROUND_UP(upper_limit, ppb*ppb);
- res -= meta_blocks;
- check_lfs:
- res <<= bits;
- 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;
-
- 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;
- return ext2_group_first_block_no(sb, bg) + ext2_bg_has_super(sb, bg);
- }
- 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 = -ENOMEM;
- int blocksize = BLOCK_SIZE;
- int db_count;
- int i, j;
- __le32 features;
- int err;
- struct ext2_mount_options opts;
- sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
- if (!sbi)
- return -ENOMEM;
- sbi->s_blockgroup_lock =
- kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
- if (!sbi->s_blockgroup_lock) {
- kfree(sbi);
- return -ENOMEM;
- }
- sb->s_fs_info = sbi;
- sbi->s_sb_block = sb_block;
- sbi->s_daxdev = fs_dax_get_by_bdev(sb->s_bdev, &sbi->s_dax_part_off,
- NULL, NULL);
- spin_lock_init(&sbi->s_lock);
- ret = -EINVAL;
- /*
- * 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;
- opts.s_mount_opt = 0;
- /* 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(opts.s_mount_opt, DEBUG);
- if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
- set_opt(opts.s_mount_opt, GRPID);
- if (def_mount_opts & EXT2_DEFM_UID16)
- set_opt(opts.s_mount_opt, NO_UID32);
- #ifdef CONFIG_EXT2_FS_XATTR
- if (def_mount_opts & EXT2_DEFM_XATTR_USER)
- set_opt(opts.s_mount_opt, XATTR_USER);
- #endif
- #ifdef CONFIG_EXT2_FS_POSIX_ACL
- if (def_mount_opts & EXT2_DEFM_ACL)
- set_opt(opts.s_mount_opt, POSIX_ACL);
- #endif
-
- if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
- set_opt(opts.s_mount_opt, ERRORS_PANIC);
- else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
- set_opt(opts.s_mount_opt, ERRORS_CONT);
- else
- set_opt(opts.s_mount_opt, ERRORS_RO);
- opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
- opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
-
- set_opt(opts.s_mount_opt, RESERVATION);
- if (!parse_options((char *) data, sb, &opts))
- goto failed_mount;
- sbi->s_mount_opt = opts.s_mount_opt;
- sbi->s_resuid = opts.s_resuid;
- sbi->s_resgid = opts.s_resgid;
- sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
- (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
- sb->s_iflags |= SB_I_CGROUPWB;
- if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
- (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
- EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
- EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
- ext2_msg(sb, KERN_WARNING,
- "warning: feature flags set on rev 0 fs, "
- "running e2fsck is recommended");
- /*
- * Check feature flags regardless of the revision level, since we
- * previously didn't change the revision level when setting the flags,
- * so there is a chance incompat flags are set on a rev 0 filesystem.
- */
- features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
- if (features) {
- ext2_msg(sb, KERN_ERR, "error: couldn't mount because of "
- "unsupported optional features (%x)",
- le32_to_cpu(features));
- goto failed_mount;
- }
- if (!sb_rdonly(sb) && (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;
- }
- if (le32_to_cpu(es->s_log_block_size) >
- (EXT2_MAX_BLOCK_LOG_SIZE - BLOCK_SIZE_BITS)) {
- ext2_msg(sb, KERN_ERR,
- "Invalid log block size: %u",
- le32_to_cpu(es->s_log_block_size));
- goto failed_mount;
- }
- blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
- if (test_opt(sb, DAX)) {
- if (!sbi->s_daxdev) {
- ext2_msg(sb, KERN_ERR,
- "DAX unsupported by block device. Turning off DAX.");
- clear_opt(sbi->s_mount_opt, DAX);
- } else if (blocksize != PAGE_SIZE) {
- ext2_msg(sb, KERN_ERR, "unsupported blocksize for DAX\n");
- clear_opt(sbi->s_mount_opt, DAX);
- }
- }
- /* 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;
- sb->s_time_min = S32_MIN;
- sb->s_time_max = S32_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_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
- sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
- 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 (es->s_log_frag_size != es->s_log_block_size) {
- ext2_msg(sb, KERN_ERR,
- "error: fragsize log %u != blocksize log %u",
- le32_to_cpu(es->s_log_frag_size), sb->s_blocksize_bits);
- 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;
- }
- /* At least inode table, bitmaps, and sb have to fit in one group */
- if (sbi->s_blocks_per_group <= sbi->s_itb_per_group + 3) {
- ext2_msg(sb, KERN_ERR,
- "error: #blocks per group smaller than metadata size: %lu <= %lu",
- sbi->s_blocks_per_group, sbi->s_inodes_per_group + 3);
- goto failed_mount;
- }
- if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
- sbi->s_inodes_per_group > sb->s_blocksize * 8) {
- ext2_msg(sb, KERN_ERR,
- "error: invalid #inodes per group: %lu",
- sbi->s_inodes_per_group);
- goto failed_mount;
- }
- if (sb_bdev_nr_blocks(sb) < le32_to_cpu(es->s_blocks_count)) {
- ext2_msg(sb, KERN_ERR,
- "bad geometry: block count %u exceeds size of device (%u blocks)",
- le32_to_cpu(es->s_blocks_count),
- (unsigned)sb_bdev_nr_blocks(sb));
- goto failed_mount;
- }
- 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;
- if ((u64)sbi->s_groups_count * sbi->s_inodes_per_group !=
- le32_to_cpu(es->s_inodes_count)) {
- ext2_msg(sb, KERN_ERR, "error: invalid #inodes: %u vs computed %llu",
- le32_to_cpu(es->s_inodes_count),
- (u64)sbi->s_groups_count * sbi->s_inodes_per_group);
- goto failed_mount;
- }
- db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
- EXT2_DESC_PER_BLOCK(sb);
- sbi->s_group_desc = kvmalloc_array(db_count,
- sizeof(struct buffer_head *),
- GFP_KERNEL);
- if (sbi->s_group_desc == NULL) {
- ret = -ENOMEM;
- 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) {
- ret = -ENOMEM;
- 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 filesystem reservation list head & lock */
- spin_lock_init(&sbi->s_rsv_window_lock);
- sbi->s_rsv_window_root = RB_ROOT;
- /*
- * Add a single, static dummy reservation to the start of the
- * reservation window list --- it gives us a placeholder for
- * append-at-start-of-list which makes the allocation logic
- * _much_ simpler.
- */
- sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
- sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
- sbi->s_rsv_window_head.rsv_alloc_hit = 0;
- sbi->s_rsv_window_head.rsv_goal_size = 0;
- ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);
- err = percpu_counter_init(&sbi->s_freeblocks_counter,
- ext2_count_free_blocks(sb), GFP_KERNEL);
- if (!err) {
- err = percpu_counter_init(&sbi->s_freeinodes_counter,
- ext2_count_free_inodes(sb), GFP_KERNEL);
- }
- if (!err) {
- err = percpu_counter_init(&sbi->s_dirs_counter,
- ext2_count_dirs(sb), GFP_KERNEL);
- }
- if (err) {
- ret = err;
- ext2_msg(sb, KERN_ERR, "error: insufficient memory");
- goto failed_mount3;
- }
- #ifdef CONFIG_EXT2_FS_XATTR
- sbi->s_ea_block_cache = ext2_xattr_create_cache();
- if (!sbi->s_ea_block_cache) {
- ret = -ENOMEM;
- ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache");
- goto failed_mount3;
- }
- #endif
- /*
- * set up enough so that it can read an inode
- */
- sb->s_op = &ext2_sops;
- sb->s_export_op = &ext2_export_ops;
- sb->s_xattr = ext2_xattr_handlers;
- #ifdef CONFIG_QUOTA
- sb->dq_op = &dquot_operations;
- sb->s_qcop = &ext2_quotactl_ops;
- sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
- #endif
- root = ext2_iget(sb, EXT2_ROOT_INO);
- if (IS_ERR(root)) {
- ret = PTR_ERR(root);
- goto failed_mount3;
- }
- if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
- iput(root);
- ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
- goto failed_mount3;
- }
- sb->s_root = d_make_root(root);
- if (!sb->s_root) {
- ext2_msg(sb, KERN_ERR, "error: get root inode failed");
- ret = -ENOMEM;
- goto failed_mount3;
- }
- if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
- ext2_msg(sb, KERN_WARNING,
- "warning: mounting ext3 filesystem as ext2");
- if (ext2_setup_super (sb, es, sb_rdonly(sb)))
- sb->s_flags |= SB_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:
- ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
- percpu_counter_destroy(&sbi->s_freeblocks_counter);
- percpu_counter_destroy(&sbi->s_freeinodes_counter);
- percpu_counter_destroy(&sbi->s_dirs_counter);
- failed_mount2:
- for (i = 0; i < db_count; i++)
- brelse(sbi->s_group_desc[i]);
- failed_mount_group_desc:
- kvfree(sbi->s_group_desc);
- kfree(sbi->s_debts);
- failed_mount:
- brelse(bh);
- failed_sbi:
- fs_put_dax(sbi->s_daxdev, NULL);
- sb->s_fs_info = NULL;
- kfree(sbi->s_blockgroup_lock);
- kfree(sbi);
- 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");
- clear_buffer_write_io_error(sbh);
- set_buffer_uptodate(sbh);
- }
- }
- 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(ktime_get_real_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;
- /*
- * Write quota structures to quota file, sync_blockdev() will write
- * them to disk later
- */
- dquot_writeback_dquots(sb, -1);
- 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;
- }
- static int ext2_freeze(struct super_block *sb)
- {
- struct ext2_sb_info *sbi = EXT2_SB(sb);
- /*
- * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared
- * because we have unattached inodes and thus filesystem is not fully
- * consistent.
- */
- if (atomic_long_read(&sb->s_remove_count)) {
- ext2_sync_fs(sb, 1);
- return 0;
- }
- /* Set EXT2_FS_VALID flag */
- spin_lock(&sbi->s_lock);
- sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state);
- spin_unlock(&sbi->s_lock);
- ext2_sync_super(sb, sbi->s_es, 1);
- return 0;
- }
- static int ext2_unfreeze(struct super_block *sb)
- {
- /* Just write sb to clear EXT2_VALID_FS flag */
- ext2_write_super(sb);
- return 0;
- }
- static void ext2_write_super(struct super_block *sb)
- {
- if (!sb_rdonly(sb))
- 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;
- struct ext2_mount_options new_opts;
- int err;
- sync_filesystem(sb);
- spin_lock(&sbi->s_lock);
- new_opts.s_mount_opt = sbi->s_mount_opt;
- new_opts.s_resuid = sbi->s_resuid;
- new_opts.s_resgid = sbi->s_resgid;
- spin_unlock(&sbi->s_lock);
- if (!parse_options(data, sb, &new_opts))
- return -EINVAL;
- spin_lock(&sbi->s_lock);
- es = sbi->s_es;
- if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) {
- ext2_msg(sb, KERN_WARNING, "warning: refusing change of "
- "dax flag with busy inodes while remounting");
- new_opts.s_mount_opt ^= EXT2_MOUNT_DAX;
- }
- if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
- goto out_set;
- if (*flags & SB_RDONLY) {
- if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
- !(sbi->s_mount_state & EXT2_VALID_FS))
- goto out_set;
- /*
- * 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(ktime_get_real_seconds());
- spin_unlock(&sbi->s_lock);
- err = dquot_suspend(sb, -1);
- if (err < 0)
- return err;
- ext2_sync_super(sb, es, 1);
- } else {
- __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
- ~EXT2_FEATURE_RO_COMPAT_SUPP);
- if (ret) {
- spin_unlock(&sbi->s_lock);
- ext2_msg(sb, KERN_WARNING,
- "warning: couldn't remount RDWR because of "
- "unsupported optional features (%x).",
- le32_to_cpu(ret));
- return -EROFS;
- }
- /*
- * 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 &= ~SB_RDONLY;
- spin_unlock(&sbi->s_lock);
- ext2_write_super(sb);
- dquot_resume(sb, -1);
- }
- spin_lock(&sbi->s_lock);
- out_set:
- sbi->s_mount_opt = new_opts.s_mount_opt;
- sbi->s_resuid = new_opts.s_resuid;
- sbi->s_resgid = new_opts.s_resgid;
- sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
- (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
- spin_unlock(&sbi->s_lock);
- return 0;
- }
- 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;
- 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;
- buf->f_fsid = uuid_to_fsid(es->s_uuid);
- 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 = min_t(size_t, 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 = min_t(size_t, sb->s_blocksize - offset, towrite);
- tmp_bh.b_state = 0;
- tmp_bh.b_size = sb->s_blocksize;
- 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 (unlikely(!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_inc_iversion(inode);
- inode->i_mtime = inode->i_ctime = current_time(inode);
- mark_inode_dirty(inode);
- return len - towrite;
- }
- static int ext2_quota_on(struct super_block *sb, int type, int format_id,
- const struct path *path)
- {
- int err;
- struct inode *inode;
- err = dquot_quota_on(sb, type, format_id, path);
- if (err)
- return err;
- inode = d_inode(path->dentry);
- inode_lock(inode);
- EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL;
- inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
- S_NOATIME | S_IMMUTABLE);
- inode_unlock(inode);
- mark_inode_dirty(inode);
- return 0;
- }
- static int ext2_quota_off(struct super_block *sb, int type)
- {
- struct inode *inode = sb_dqopt(sb)->files[type];
- int err;
- if (!inode || !igrab(inode))
- goto out;
- err = dquot_quota_off(sb, type);
- if (err)
- goto out_put;
- inode_lock(inode);
- EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL);
- inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
- inode_unlock(inode);
- mark_inode_dirty(inode);
- out_put:
- iput(inode);
- return err;
- out:
- return dquot_quota_off(sb, type);
- }
- #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,
- };
- MODULE_ALIAS_FS("ext2");
- static int __init init_ext2_fs(void)
- {
- int err;
- err = init_inodecache();
- if (err)
- return err;
- err = register_filesystem(&ext2_fs_type);
- if (err)
- goto out;
- return 0;
- out:
- destroy_inodecache();
- return err;
- }
- static void __exit exit_ext2_fs(void)
- {
- unregister_filesystem(&ext2_fs_type);
- destroy_inodecache();
- }
- MODULE_AUTHOR("Remy Card and others");
- MODULE_DESCRIPTION("Second Extended Filesystem");
- MODULE_LICENSE("GPL");
- module_init(init_ext2_fs)
- module_exit(exit_ext2_fs)
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