| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Linus Torvalds (pre-git) | 2247 | 26.57% | 65 | 24.25% |
| Jan Kara | 1401 | 16.57% | 21 | 7.84% |
| Eric Sandeen | 1180 | 13.95% | 4 | 1.49% |
| Linus Torvalds | 414 | 4.90% | 14 | 5.22% |
| Andrew Morton | 319 | 3.77% | 17 | 6.34% |
| Miklos Szeredi | 301 | 3.56% | 2 | 0.75% |
| Theodore Y. Ts'o | 224 | 2.65% | 9 | 3.36% |
| Alexey Fisher | 217 | 2.57% | 1 | 0.37% |
| Jan Blunck | 210 | 2.48% | 4 | 1.49% |
| Christoph Hellwig | 201 | 2.38% | 14 | 5.22% |
| Al Viro | 191 | 2.26% | 16 | 5.97% |
| Mark Bellon | 132 | 1.56% | 1 | 0.37% |
| Brian Gerst | 126 | 1.49% | 3 | 1.12% |
| Neil Brown | 120 | 1.42% | 2 | 0.75% |
| Martin J. Bligh | 99 | 1.17% | 1 | 0.37% |
| Chengguang Xu | 89 | 1.05% | 8 | 2.99% |
| David Howells | 75 | 0.89% | 4 | 1.49% |
| Pekka J Enberg | 69 | 0.82% | 2 | 0.75% |
| Aneesh Kumar K.V | 66 | 0.78% | 2 | 0.75% |
| Eric W. Biedermann | 61 | 0.72% | 2 | 0.75% |
| Badari Pulavarty | 60 | 0.71% | 1 | 0.37% |
| Joe Perches | 57 | 0.67% | 1 | 0.37% |
| Carsten Otte | 48 | 0.57% | 3 | 1.12% |
| Heiko Carstens | 48 | 0.57% | 1 | 0.37% |
| Andries E. Brouwer | 43 | 0.51% | 2 | 0.75% |
| Matthew Wilcox | 41 | 0.48% | 5 | 1.87% |
| Dan J Williams | 37 | 0.44% | 3 | 1.12% |
| Peter Zijlstra | 36 | 0.43% | 1 | 0.37% |
| Akinobu Mita | 31 | 0.37% | 2 | 0.75% |
| zhangyi (F) | 24 | 0.28% | 1 | 0.37% |
| Stephen Rothwell | 23 | 0.27% | 1 | 0.37% |
| Deepa Dinamani | 21 | 0.25% | 2 | 0.75% |
| Mingming Cao | 20 | 0.24% | 1 | 0.37% |
| Matt Mackall | 17 | 0.20% | 1 | 0.37% |
| David Windsor | 17 | 0.20% | 1 | 0.37% |
| Vasily Averin | 17 | 0.20% | 1 | 0.37% |
| Jeff Layton | 16 | 0.19% | 3 | 1.12% |
| Manish Katiyar | 16 | 0.19% | 1 | 0.37% |
| Tejun Heo | 12 | 0.14% | 2 | 0.75% |
| Jiangshan Yi | 12 | 0.14% | 1 | 0.37% |
| Amir Goldstein | 9 | 0.11% | 2 | 0.75% |
| Marcin Ślusarz | 8 | 0.09% | 2 | 0.75% |
| Alan Cox | 8 | 0.09% | 1 | 0.37% |
| Shiyang Ruan | 8 | 0.09% | 1 | 0.37% |
| Vignesh Babu | 7 | 0.08% | 2 | 0.75% |
| Christoph Lameter | 7 | 0.08% | 3 | 1.12% |
| Tahsin Erdogan | 6 | 0.07% | 1 | 0.37% |
| James Morris | 6 | 0.07% | 1 | 0.37% |
| Kirill A. Shutemov | 4 | 0.05% | 1 | 0.37% |
| Hsiang Kao | 4 | 0.05% | 1 | 0.37% |
| Shilong Wang | 3 | 0.04% | 1 | 0.37% |
| Dave Kleikamp | 3 | 0.04% | 1 | 0.37% |
| Song Muchun | 3 | 0.04% | 1 | 0.37% |
| Robin Dong | 3 | 0.04% | 1 | 0.37% |
| Arnaldo Carvalho de Melo | 3 | 0.04% | 1 | 0.37% |
| Tobias Poschwatta | 3 | 0.04% | 1 | 0.37% |
| Arnd Bergmann | 3 | 0.04% | 1 | 0.37% |
| Dave Jiang | 3 | 0.04% | 1 | 0.37% |
| Nicholas Piggin | 3 | 0.04% | 1 | 0.37% |
| Andi Kleen | 3 | 0.04% | 1 | 0.37% |
| Yoann Padioleau | 2 | 0.02% | 1 | 0.37% |
| Gustavo A. R. Silva | 2 | 0.02% | 1 | 0.37% |
| Stephen C. Tweedie | 2 | 0.02% | 1 | 0.37% |
| Stephen Hemminger | 2 | 0.02% | 1 | 0.37% |
| Thomas Gleixner | 1 | 0.01% | 1 | 0.37% |
| Panagiotis Issaris | 1 | 0.01% | 1 | 0.37% |
| Josef 'Jeff' Sipek | 1 | 0.01% | 1 | 0.37% |
| Fabian Frederick | 1 | 0.01% | 1 | 0.37% |
| Kees Cook | 1 | 0.01% | 1 | 0.37% |
| Vladimir Davydov | 1 | 0.01% | 1 | 0.37% |
| Li Haifeng | 1 | 0.01% | 1 | 0.37% |
| Liu xuzhi | 1 | 0.01% | 1 | 0.37% |
| Steven Whitehouse | 1 | 0.01% | 1 | 0.37% |
| Lucas De Marchi | 1 | 0.01% | 1 | 0.37% |
| Mikulas Patocka | 1 | 0.01% | 1 | 0.37% |
| Julia Lawall | 1 | 0.01% | 1 | 0.37% |
| Paul Jackson | 1 | 0.01% | 1 | 0.37% |
| Total | 8456 | 268 |
// SPDX-License-Identifier: GPL-2.0-only /* * linux/fs/ext2/super.c * * Copyright (C) 1992, 1993, 1994, 1995 * Remy Card (card@masi.ibp.fr) * Laboratoire MASI - Institut Blaise Pascal * Universite Pierre et Marie Curie (Paris VI) * * from * * linux/fs/minix/inode.c * * Copyright (C) 1991, 1992 Linus Torvalds * * Big-endian to little-endian byte-swapping/bitmaps by * David S. Miller (davem@caip.rutgers.edu), 1995 */ #include <linux/module.h> #include <linux/string.h> #include <linux/fs.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/blkdev.h> #include <linux/fs_context.h> #include <linux/fs_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_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; } } static void ext2_msg_fc(struct fs_context *fc, const char *prefix, const char *fmt, ...) { struct va_format vaf; va_list args; const char *s_id; if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { s_id = fc->root->d_sb->s_id; } else { /* get last path component of source */ s_id = strrchr(fc->source, '/'); if (s_id) s_id++; else s_id = fc->source; } va_start(args, fmt); vaf.fmt = fmt; vaf.va = &args; printk("%sEXT2-fs (%s): %pV\n", prefix, s_id, &vaf); va_end(args); } 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_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 __rcu **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, .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 = { .encode_fh = generic_encode_ino32_fh, .fh_to_dentry = ext2_fh_to_dentry, .fh_to_parent = ext2_fh_to_parent, .get_parent = ext2_get_parent, }; enum { Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, Opt_resgid, Opt_resuid, Opt_sb, Opt_errors, Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_acl, Opt_xip, Opt_dax, Opt_ignore, Opt_quota, Opt_usrquota, Opt_grpquota, Opt_reservation, }; static const struct constant_table ext2_param_errors[] = { {"continue", EXT2_MOUNT_ERRORS_CONT}, {"panic", EXT2_MOUNT_ERRORS_PANIC}, {"remount-ro", EXT2_MOUNT_ERRORS_RO}, {} }; static const struct fs_parameter_spec ext2_param_spec[] = { fsparam_flag ("bsddf", Opt_bsd_df), fsparam_flag ("minixdf", Opt_minix_df), fsparam_flag ("grpid", Opt_grpid), fsparam_flag ("bsdgroups", Opt_grpid), fsparam_flag ("nogrpid", Opt_nogrpid), fsparam_flag ("sysvgroups", Opt_nogrpid), fsparam_gid ("resgid", Opt_resgid), fsparam_uid ("resuid", Opt_resuid), fsparam_u32 ("sb", Opt_sb), fsparam_enum ("errors", Opt_errors, ext2_param_errors), fsparam_flag ("nouid32", Opt_nouid32), fsparam_flag ("debug", Opt_debug), fsparam_flag ("oldalloc", Opt_oldalloc), fsparam_flag ("orlov", Opt_orlov), fsparam_flag ("nobh", Opt_nobh), fsparam_flag_no ("user_xattr", Opt_user_xattr), fsparam_flag_no ("acl", Opt_acl), fsparam_flag ("xip", Opt_xip), fsparam_flag ("dax", Opt_dax), fsparam_flag ("grpquota", Opt_grpquota), fsparam_flag ("noquota", Opt_ignore), fsparam_flag ("quota", Opt_quota), fsparam_flag ("usrquota", Opt_usrquota), fsparam_flag_no ("reservation", Opt_reservation), {} }; #define EXT2_SPEC_s_resuid (1 << 0) #define EXT2_SPEC_s_resgid (1 << 1) struct ext2_fs_context { unsigned long vals_s_flags; /* Bits to set in s_flags */ unsigned long mask_s_flags; /* Bits changed in s_flags */ unsigned int vals_s_mount_opt; unsigned int mask_s_mount_opt; kuid_t s_resuid; kgid_t s_resgid; unsigned long s_sb_block; unsigned int spec; }; static inline void ctx_set_mount_opt(struct ext2_fs_context *ctx, unsigned long flag) { ctx->mask_s_mount_opt |= flag; ctx->vals_s_mount_opt |= flag; } static inline void ctx_clear_mount_opt(struct ext2_fs_context *ctx, unsigned long flag) { ctx->mask_s_mount_opt |= flag; ctx->vals_s_mount_opt &= ~flag; } static inline unsigned long ctx_test_mount_opt(struct ext2_fs_context *ctx, unsigned long flag) { return (ctx->vals_s_mount_opt & flag); } static inline bool ctx_parsed_mount_opt(struct ext2_fs_context *ctx, unsigned long flag) { return (ctx->mask_s_mount_opt & flag); } static void ext2_free_fc(struct fs_context *fc) { kfree(fc->fs_private); } static int ext2_parse_param(struct fs_context *fc, struct fs_parameter *param) { struct ext2_fs_context *ctx = fc->fs_private; int opt; struct fs_parse_result result; opt = fs_parse(fc, ext2_param_spec, param, &result); if (opt < 0) return opt; switch (opt) { case Opt_bsd_df: ctx_clear_mount_opt(ctx, EXT2_MOUNT_MINIX_DF); break; case Opt_minix_df: ctx_set_mount_opt(ctx, EXT2_MOUNT_MINIX_DF); break; case Opt_grpid: ctx_set_mount_opt(ctx, EXT2_MOUNT_GRPID); break; case Opt_nogrpid: ctx_clear_mount_opt(ctx, EXT2_MOUNT_GRPID); break; case Opt_resuid: ctx->s_resuid = result.uid; ctx->spec |= EXT2_SPEC_s_resuid; break; case Opt_resgid: ctx->s_resgid = result.gid; ctx->spec |= EXT2_SPEC_s_resgid; break; case Opt_sb: /* Note that this is silently ignored on remount */ ctx->s_sb_block = result.uint_32; break; case Opt_errors: ctx_clear_mount_opt(ctx, EXT2_MOUNT_ERRORS_MASK); ctx_set_mount_opt(ctx, result.uint_32); break; case Opt_nouid32: ctx_set_mount_opt(ctx, EXT2_MOUNT_NO_UID32); break; case Opt_debug: ctx_set_mount_opt(ctx, EXT2_MOUNT_DEBUG); break; case Opt_oldalloc: ctx_set_mount_opt(ctx, EXT2_MOUNT_OLDALLOC); break; case Opt_orlov: ctx_clear_mount_opt(ctx, EXT2_MOUNT_OLDALLOC); break; case Opt_nobh: ext2_msg_fc(fc, KERN_INFO, "nobh option not supported\n"); break; #ifdef CONFIG_EXT2_FS_XATTR case Opt_user_xattr: if (!result.negated) ctx_set_mount_opt(ctx, EXT2_MOUNT_XATTR_USER); else ctx_clear_mount_opt(ctx, EXT2_MOUNT_XATTR_USER); break; #else case Opt_user_xattr: ext2_msg_fc(fc, KERN_INFO, "(no)user_xattr options not supported"); break; #endif #ifdef CONFIG_EXT2_FS_POSIX_ACL case Opt_acl: if (!result.negated) ctx_set_mount_opt(ctx, EXT2_MOUNT_POSIX_ACL); else ctx_clear_mount_opt(ctx, EXT2_MOUNT_POSIX_ACL); break; #else case Opt_acl: ext2_msg_fc(fc, KERN_INFO, "(no)acl options not supported"); break; #endif case Opt_xip: ext2_msg_fc(fc, KERN_INFO, "use dax instead of xip"); ctx_set_mount_opt(ctx, EXT2_MOUNT_XIP); fallthrough; case Opt_dax: #ifdef CONFIG_FS_DAX ext2_msg_fc(fc, KERN_WARNING, "DAX enabled. Warning: DAX support in ext2 driver is deprecated" " and will be removed at the end of 2025. Please use ext4 driver instead."); ctx_set_mount_opt(ctx, EXT2_MOUNT_DAX); #else ext2_msg_fc(fc, KERN_INFO, "dax option not supported"); #endif break; #if defined(CONFIG_QUOTA) case Opt_quota: case Opt_usrquota: ctx_set_mount_opt(ctx, EXT2_MOUNT_USRQUOTA); break; case Opt_grpquota: ctx_set_mount_opt(ctx, EXT2_MOUNT_GRPQUOTA); break; #else case Opt_quota: case Opt_usrquota: case Opt_grpquota: ext2_msg_fc(fc, KERN_INFO, "quota operations not supported"); break; #endif case Opt_reservation: if (!result.negated) { ctx_set_mount_opt(ctx, EXT2_MOUNT_RESERVATION); ext2_msg_fc(fc, KERN_INFO, "reservations ON"); } else { ctx_clear_mount_opt(ctx, EXT2_MOUNT_RESERVATION); ext2_msg_fc(fc, KERN_INFO, "reservations OFF"); } break; case Opt_ignore: break; default: return -EINVAL; } return 0; } 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); } /* * Set all mount options either from defaults on disk, or from parsed * options. Parsed/specified options override on-disk defaults. */ static void ext2_set_options(struct fs_context *fc, struct ext2_sb_info *sbi) { struct ext2_fs_context *ctx = fc->fs_private; struct ext2_super_block *es = sbi->s_es; unsigned long def_mount_opts = le32_to_cpu(es->s_default_mount_opts); /* Copy parsed mount options to sbi */ sbi->s_mount_opt = ctx->vals_s_mount_opt; /* Use in-superblock defaults only if not specified during parsing */ if (!ctx_parsed_mount_opt(ctx, EXT2_MOUNT_DEBUG) && def_mount_opts & EXT2_DEFM_DEBUG) set_opt(sbi->s_mount_opt, DEBUG); if (!ctx_parsed_mount_opt(ctx, EXT2_MOUNT_GRPID) && def_mount_opts & EXT2_DEFM_BSDGROUPS) set_opt(sbi->s_mount_opt, GRPID); if (!ctx_parsed_mount_opt(ctx, EXT2_MOUNT_NO_UID32) && def_mount_opts & EXT2_DEFM_UID16) set_opt(sbi->s_mount_opt, NO_UID32); #ifdef CONFIG_EXT2_FS_XATTR if (!ctx_parsed_mount_opt(ctx, EXT2_MOUNT_XATTR_USER) && def_mount_opts & EXT2_DEFM_XATTR_USER) set_opt(sbi->s_mount_opt, XATTR_USER); #endif #ifdef CONFIG_EXT2_FS_POSIX_ACL if (!ctx_parsed_mount_opt(ctx, EXT2_MOUNT_POSIX_ACL) && def_mount_opts & EXT2_DEFM_ACL) set_opt(sbi->s_mount_opt, POSIX_ACL); #endif if (!ctx_parsed_mount_opt(ctx, EXT2_MOUNT_ERRORS_MASK)) { 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); } if (ctx->spec & EXT2_SPEC_s_resuid) sbi->s_resuid = ctx->s_resuid; else sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); if (ctx->spec & EXT2_SPEC_s_resgid) sbi->s_resgid = ctx->s_resgid; else sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); } static int ext2_fill_super(struct super_block *sb, struct fs_context *fc) { struct ext2_fs_context *ctx = fc->fs_private; int silent = fc->sb_flags & SB_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 = ctx->s_sb_block; unsigned long logic_sb_block; unsigned long offset = 0; long ret = -ENOMEM; int blocksize = BLOCK_SIZE; int db_count; int i, j; __le32 features; int err; sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); if (!sbi) return -ENOMEM; sbi->s_blockgroup_lock = kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); if (!sbi->s_blockgroup_lock) { kfree(sbi); return -ENOMEM; } sb->s_fs_info = sbi; sbi->s_sb_block = sb_block; 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; ext2_set_options(fc, sbi); 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_reconfigure(struct fs_context *fc) { struct ext2_fs_context *ctx = fc->fs_private; struct super_block *sb = fc->root->d_sb; struct ext2_sb_info * sbi = EXT2_SB(sb); struct ext2_super_block * es; struct ext2_mount_options new_opts; int flags = fc->sb_flags; int err; sync_filesystem(sb); new_opts.s_mount_opt = ctx->vals_s_mount_opt; new_opts.s_resuid = ctx->s_resuid; new_opts.s_resgid = ctx->s_resgid; 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 int ext2_get_tree(struct fs_context *fc) { return get_tree_bdev(fc, 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_folio(bh->b_folio); 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_set_mtime_to_ts(inode, inode_set_ctime_current(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 const struct fs_context_operations ext2_context_ops = { .parse_param = ext2_parse_param, .get_tree = ext2_get_tree, .reconfigure = ext2_reconfigure, .free = ext2_free_fc, }; static int ext2_init_fs_context(struct fs_context *fc) { struct ext2_fs_context *ctx; ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); if (!ctx) return -ENOMEM; if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { struct super_block *sb = fc->root->d_sb; struct ext2_sb_info *sbi = EXT2_SB(sb); spin_lock(&sbi->s_lock); ctx->vals_s_mount_opt = sbi->s_mount_opt; ctx->vals_s_flags = sb->s_flags; ctx->s_resuid = sbi->s_resuid; ctx->s_resgid = sbi->s_resgid; spin_unlock(&sbi->s_lock); } else { ctx->s_sb_block = 1; ctx_set_mount_opt(ctx, EXT2_MOUNT_RESERVATION); } fc->fs_private = ctx; fc->ops = &ext2_context_ops; return 0; } static struct file_system_type ext2_fs_type = { .owner = THIS_MODULE, .name = "ext2", .kill_sb = kill_block_super, .fs_flags = FS_REQUIRES_DEV, .init_fs_context = ext2_init_fs_context, .parameters = ext2_param_spec, }; 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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