diff options
Diffstat (limited to 'kernel/fs/ext3/super.c')
| -rw-r--r-- | kernel/fs/ext3/super.c | 3165 |
1 files changed, 0 insertions, 3165 deletions
diff --git a/kernel/fs/ext3/super.c b/kernel/fs/ext3/super.c deleted file mode 100644 index a9312f0a5..000000000 --- a/kernel/fs/ext3/super.c +++ /dev/null @@ -1,3165 +0,0 @@ -/* - * linux/fs/ext3/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/blkdev.h> -#include <linux/parser.h> -#include <linux/exportfs.h> -#include <linux/statfs.h> -#include <linux/random.h> -#include <linux/mount.h> -#include <linux/quotaops.h> -#include <linux/seq_file.h> -#include <linux/log2.h> -#include <linux/cleancache.h> -#include <linux/namei.h> - -#include <asm/uaccess.h> - -#define CREATE_TRACE_POINTS - -#include "ext3.h" -#include "xattr.h" -#include "acl.h" -#include "namei.h" - -#ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED - #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA -#else - #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA -#endif - -static int ext3_load_journal(struct super_block *, struct ext3_super_block *, - unsigned long journal_devnum); -static int ext3_create_journal(struct super_block *, struct ext3_super_block *, - unsigned int); -static int ext3_commit_super(struct super_block *sb, - struct ext3_super_block *es, - int sync); -static void ext3_mark_recovery_complete(struct super_block * sb, - struct ext3_super_block * es); -static void ext3_clear_journal_err(struct super_block * sb, - struct ext3_super_block * es); -static int ext3_sync_fs(struct super_block *sb, int wait); -static const char *ext3_decode_error(struct super_block * sb, int errno, - char nbuf[16]); -static int ext3_remount (struct super_block * sb, int * flags, char * data); -static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf); -static int ext3_unfreeze(struct super_block *sb); -static int ext3_freeze(struct super_block *sb); - -/* - * Wrappers for journal_start/end. - */ -handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks) -{ - journal_t *journal; - - if (sb->s_flags & MS_RDONLY) - return ERR_PTR(-EROFS); - - /* Special case here: if the journal has aborted behind our - * backs (eg. EIO in the commit thread), then we still need to - * take the FS itself readonly cleanly. */ - journal = EXT3_SB(sb)->s_journal; - if (is_journal_aborted(journal)) { - ext3_abort(sb, __func__, - "Detected aborted journal"); - return ERR_PTR(-EROFS); - } - - return journal_start(journal, nblocks); -} - -int __ext3_journal_stop(const char *where, handle_t *handle) -{ - struct super_block *sb; - int err; - int rc; - - sb = handle->h_transaction->t_journal->j_private; - err = handle->h_err; - rc = journal_stop(handle); - - if (!err) - err = rc; - if (err) - __ext3_std_error(sb, where, err); - return err; -} - -void ext3_journal_abort_handle(const char *caller, const char *err_fn, - struct buffer_head *bh, handle_t *handle, int err) -{ - char nbuf[16]; - const char *errstr = ext3_decode_error(NULL, err, nbuf); - - if (bh) - BUFFER_TRACE(bh, "abort"); - - if (!handle->h_err) - handle->h_err = err; - - if (is_handle_aborted(handle)) - return; - - printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n", - caller, errstr, err_fn); - - journal_abort_handle(handle); -} - -void ext3_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("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf); - - va_end(args); -} - -/* Deal with the reporting of failure conditions on a filesystem such as - * inconsistencies detected or read IO failures. - * - * On ext2, we can store the error state of the filesystem in the - * superblock. That is not possible on ext3, because we may have other - * write ordering constraints on the superblock which prevent us from - * writing it out straight away; and given that the journal is about to - * be aborted, we can't rely on the current, or future, transactions to - * write out the superblock safely. - * - * We'll just use the journal_abort() error code to record an error in - * the journal instead. On recovery, the journal will complain about - * that error until we've noted it down and cleared it. - */ - -static void ext3_handle_error(struct super_block *sb) -{ - struct ext3_super_block *es = EXT3_SB(sb)->s_es; - - EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; - es->s_state |= cpu_to_le16(EXT3_ERROR_FS); - - if (sb->s_flags & MS_RDONLY) - return; - - if (!test_opt (sb, ERRORS_CONT)) { - journal_t *journal = EXT3_SB(sb)->s_journal; - - set_opt(EXT3_SB(sb)->s_mount_opt, ABORT); - if (journal) - journal_abort(journal, -EIO); - } - if (test_opt (sb, ERRORS_RO)) { - ext3_msg(sb, KERN_CRIT, - "error: remounting filesystem read-only"); - /* - * Make sure updated value of ->s_mount_state will be visible - * before ->s_flags update. - */ - smp_wmb(); - sb->s_flags |= MS_RDONLY; - } - ext3_commit_super(sb, es, 1); - if (test_opt(sb, ERRORS_PANIC)) - panic("EXT3-fs (%s): panic forced after error\n", - sb->s_id); -} - -void ext3_error(struct super_block *sb, const char *function, - const char *fmt, ...) -{ - struct va_format vaf; - va_list args; - - va_start(args, fmt); - - vaf.fmt = fmt; - vaf.va = &args; - - printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n", - sb->s_id, function, &vaf); - - va_end(args); - - ext3_handle_error(sb); -} - -static const char *ext3_decode_error(struct super_block * sb, int errno, - char nbuf[16]) -{ - char *errstr = NULL; - - switch (errno) { - case -EIO: - errstr = "IO failure"; - break; - case -ENOMEM: - errstr = "Out of memory"; - break; - case -EROFS: - if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT) - errstr = "Journal has aborted"; - else - errstr = "Readonly filesystem"; - break; - default: - /* If the caller passed in an extra buffer for unknown - * errors, textualise them now. Else we just return - * NULL. */ - if (nbuf) { - /* Check for truncated error codes... */ - if (snprintf(nbuf, 16, "error %d", -errno) >= 0) - errstr = nbuf; - } - break; - } - - return errstr; -} - -/* __ext3_std_error decodes expected errors from journaling functions - * automatically and invokes the appropriate error response. */ - -void __ext3_std_error (struct super_block * sb, const char * function, - int errno) -{ - char nbuf[16]; - const char *errstr; - - /* Special case: if the error is EROFS, and we're not already - * inside a transaction, then there's really no point in logging - * an error. */ - if (errno == -EROFS && journal_current_handle() == NULL && - (sb->s_flags & MS_RDONLY)) - return; - - errstr = ext3_decode_error(sb, errno, nbuf); - ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr); - - ext3_handle_error(sb); -} - -/* - * ext3_abort is a much stronger failure handler than ext3_error. The - * abort function may be used to deal with unrecoverable failures such - * as journal IO errors or ENOMEM at a critical moment in log management. - * - * We unconditionally force the filesystem into an ABORT|READONLY state, - * unless the error response on the fs has been set to panic in which - * case we take the easy way out and panic immediately. - */ - -void ext3_abort(struct super_block *sb, const char *function, - const char *fmt, ...) -{ - struct va_format vaf; - va_list args; - - va_start(args, fmt); - - vaf.fmt = fmt; - vaf.va = &args; - - printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n", - sb->s_id, function, &vaf); - - va_end(args); - - if (test_opt(sb, ERRORS_PANIC)) - panic("EXT3-fs: panic from previous error\n"); - - if (sb->s_flags & MS_RDONLY) - return; - - ext3_msg(sb, KERN_CRIT, - "error: remounting filesystem read-only"); - EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; - set_opt(EXT3_SB(sb)->s_mount_opt, ABORT); - /* - * Make sure updated value of ->s_mount_state will be visible - * before ->s_flags update. - */ - smp_wmb(); - sb->s_flags |= MS_RDONLY; - - if (EXT3_SB(sb)->s_journal) - journal_abort(EXT3_SB(sb)->s_journal, -EIO); -} - -void ext3_warning(struct super_block *sb, const char *function, - const char *fmt, ...) -{ - struct va_format vaf; - va_list args; - - va_start(args, fmt); - - vaf.fmt = fmt; - vaf.va = &args; - - printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n", - sb->s_id, function, &vaf); - - va_end(args); -} - -void ext3_update_dynamic_rev(struct super_block *sb) -{ - struct ext3_super_block *es = EXT3_SB(sb)->s_es; - - if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV) - return; - - ext3_msg(sb, KERN_WARNING, - "warning: updating to rev %d because of " - "new feature flag, running e2fsck is recommended", - EXT3_DYNAMIC_REV); - - es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO); - es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE); - es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV); - /* leave es->s_feature_*compat flags alone */ - /* es->s_uuid will be set by e2fsck if empty */ - - /* - * The rest of the superblock fields should be zero, and if not it - * means they are likely already in use, so leave them alone. We - * can leave it up to e2fsck to clean up any inconsistencies there. - */ -} - -/* - * Open the external journal device - */ -static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb) -{ - struct block_device *bdev; - char b[BDEVNAME_SIZE]; - - bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb); - if (IS_ERR(bdev)) - goto fail; - return bdev; - -fail: - ext3_msg(sb, KERN_ERR, "error: failed to open journal device %s: %ld", - __bdevname(dev, b), PTR_ERR(bdev)); - - return NULL; -} - -/* - * Release the journal device - */ -static void ext3_blkdev_put(struct block_device *bdev) -{ - blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); -} - -static void ext3_blkdev_remove(struct ext3_sb_info *sbi) -{ - struct block_device *bdev; - bdev = sbi->journal_bdev; - if (bdev) { - ext3_blkdev_put(bdev); - sbi->journal_bdev = NULL; - } -} - -static inline struct inode *orphan_list_entry(struct list_head *l) -{ - return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode; -} - -static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi) -{ - struct list_head *l; - - ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d", - le32_to_cpu(sbi->s_es->s_last_orphan)); - - ext3_msg(sb, KERN_ERR, "sb_info orphan list:"); - list_for_each(l, &sbi->s_orphan) { - struct inode *inode = orphan_list_entry(l); - ext3_msg(sb, KERN_ERR, " " - "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", - inode->i_sb->s_id, inode->i_ino, inode, - inode->i_mode, inode->i_nlink, - NEXT_ORPHAN(inode)); - } -} - -static void ext3_put_super (struct super_block * sb) -{ - struct ext3_sb_info *sbi = EXT3_SB(sb); - struct ext3_super_block *es = sbi->s_es; - int i, err; - - dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); - ext3_xattr_put_super(sb); - err = journal_destroy(sbi->s_journal); - sbi->s_journal = NULL; - if (err < 0) - ext3_abort(sb, __func__, "Couldn't clean up the journal"); - - if (!(sb->s_flags & MS_RDONLY)) { - EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); - es->s_state = cpu_to_le16(sbi->s_mount_state); - BUFFER_TRACE(sbi->s_sbh, "marking dirty"); - mark_buffer_dirty(sbi->s_sbh); - ext3_commit_super(sb, es, 1); - } - - for (i = 0; i < sbi->s_gdb_count; i++) - brelse(sbi->s_group_desc[i]); - kfree(sbi->s_group_desc); - 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); -#ifdef CONFIG_QUOTA - for (i = 0; i < EXT3_MAXQUOTAS; i++) - kfree(sbi->s_qf_names[i]); -#endif - - /* Debugging code just in case the in-memory inode orphan list - * isn't empty. The on-disk one can be non-empty if we've - * detected an error and taken the fs readonly, but the - * in-memory list had better be clean by this point. */ - if (!list_empty(&sbi->s_orphan)) - dump_orphan_list(sb, sbi); - J_ASSERT(list_empty(&sbi->s_orphan)); - - invalidate_bdev(sb->s_bdev); - if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { - /* - * Invalidate the journal device's buffers. We don't want them - * floating about in memory - the physical journal device may - * hotswapped, and it breaks the `ro-after' testing code. - */ - sync_blockdev(sbi->journal_bdev); - invalidate_bdev(sbi->journal_bdev); - ext3_blkdev_remove(sbi); - } - sb->s_fs_info = NULL; - kfree(sbi->s_blockgroup_lock); - mutex_destroy(&sbi->s_orphan_lock); - mutex_destroy(&sbi->s_resize_lock); - kfree(sbi); -} - -static struct kmem_cache *ext3_inode_cachep; - -/* - * Called inside transaction, so use GFP_NOFS - */ -static struct inode *ext3_alloc_inode(struct super_block *sb) -{ - struct ext3_inode_info *ei; - - ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS); - if (!ei) - return NULL; - ei->i_block_alloc_info = NULL; - ei->vfs_inode.i_version = 1; - atomic_set(&ei->i_datasync_tid, 0); - atomic_set(&ei->i_sync_tid, 0); -#ifdef CONFIG_QUOTA - memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); -#endif - - return &ei->vfs_inode; -} - -static int ext3_drop_inode(struct inode *inode) -{ - int drop = generic_drop_inode(inode); - - trace_ext3_drop_inode(inode, drop); - return drop; -} - -static void ext3_i_callback(struct rcu_head *head) -{ - struct inode *inode = container_of(head, struct inode, i_rcu); - kmem_cache_free(ext3_inode_cachep, EXT3_I(inode)); -} - -static void ext3_destroy_inode(struct inode *inode) -{ - if (!list_empty(&(EXT3_I(inode)->i_orphan))) { - printk("EXT3 Inode %p: orphan list check failed!\n", - EXT3_I(inode)); - print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, - EXT3_I(inode), sizeof(struct ext3_inode_info), - false); - dump_stack(); - } - call_rcu(&inode->i_rcu, ext3_i_callback); -} - -static void init_once(void *foo) -{ - struct ext3_inode_info *ei = (struct ext3_inode_info *) foo; - - INIT_LIST_HEAD(&ei->i_orphan); -#ifdef CONFIG_EXT3_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) -{ - ext3_inode_cachep = kmem_cache_create("ext3_inode_cache", - sizeof(struct ext3_inode_info), - 0, (SLAB_RECLAIM_ACCOUNT| - SLAB_MEM_SPREAD), - init_once); - if (ext3_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(ext3_inode_cachep); -} - -static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb) -{ -#if defined(CONFIG_QUOTA) - struct ext3_sb_info *sbi = EXT3_SB(sb); - - if (sbi->s_jquota_fmt) { - char *fmtname = ""; - - switch (sbi->s_jquota_fmt) { - case QFMT_VFS_OLD: - fmtname = "vfsold"; - break; - case QFMT_VFS_V0: - fmtname = "vfsv0"; - break; - case QFMT_VFS_V1: - fmtname = "vfsv1"; - break; - } - seq_printf(seq, ",jqfmt=%s", fmtname); - } - - if (sbi->s_qf_names[USRQUOTA]) - seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); - - if (sbi->s_qf_names[GRPQUOTA]) - seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); - - if (test_opt(sb, USRQUOTA)) - seq_puts(seq, ",usrquota"); - - if (test_opt(sb, GRPQUOTA)) - seq_puts(seq, ",grpquota"); -#endif -} - -static char *data_mode_string(unsigned long mode) -{ - switch (mode) { - case EXT3_MOUNT_JOURNAL_DATA: - return "journal"; - case EXT3_MOUNT_ORDERED_DATA: - return "ordered"; - case EXT3_MOUNT_WRITEBACK_DATA: - return "writeback"; - } - return "unknown"; -} - -/* - * Show an option if - * - it's set to a non-default value OR - * - if the per-sb default is different from the global default - */ -static int ext3_show_options(struct seq_file *seq, struct dentry *root) -{ - struct super_block *sb = root->d_sb; - struct ext3_sb_info *sbi = EXT3_SB(sb); - struct ext3_super_block *es = sbi->s_es; - unsigned long def_mount_opts; - - 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 & EXT3_DEFM_BSDGROUPS)) - seq_puts(seq, ",nogrpid"); - if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT3_DEF_RESUID)) || - le16_to_cpu(es->s_def_resuid) != EXT3_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, EXT3_DEF_RESGID)) || - le16_to_cpu(es->s_def_resgid) != EXT3_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 == EXT3_ERRORS_PANIC || - def_errors == EXT3_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"); -#ifdef CONFIG_EXT3_FS_XATTR - if (test_opt(sb, XATTR_USER)) - seq_puts(seq, ",user_xattr"); - if (!test_opt(sb, XATTR_USER) && - (def_mount_opts & EXT3_DEFM_XATTR_USER)) { - seq_puts(seq, ",nouser_xattr"); - } -#endif -#ifdef CONFIG_EXT3_FS_POSIX_ACL - if (test_opt(sb, POSIX_ACL)) - seq_puts(seq, ",acl"); - if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL)) - seq_puts(seq, ",noacl"); -#endif - if (!test_opt(sb, RESERVATION)) - seq_puts(seq, ",noreservation"); - if (sbi->s_commit_interval) { - seq_printf(seq, ",commit=%u", - (unsigned) (sbi->s_commit_interval / HZ)); - } - - /* - * Always display barrier state so it's clear what the status is. - */ - seq_puts(seq, ",barrier="); - seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0"); - seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS))); - if (test_opt(sb, DATA_ERR_ABORT)) - seq_puts(seq, ",data_err=abort"); - - if (test_opt(sb, NOLOAD)) - seq_puts(seq, ",norecovery"); - - ext3_show_quota_options(seq, sb); - - return 0; -} - - -static struct inode *ext3_nfs_get_inode(struct super_block *sb, - u64 ino, u32 generation) -{ - struct inode *inode; - - if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO) - return ERR_PTR(-ESTALE); - if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count)) - return ERR_PTR(-ESTALE); - - /* iget isn't really right if the inode is currently unallocated!! - * - * ext3_read_inode will return a bad_inode if the inode had been - * deleted, so we should be safe. - * - * Currently we don't know the generation for parent directory, so - * a generation of 0 means "accept any" - */ - inode = ext3_iget(sb, ino); - if (IS_ERR(inode)) - return ERR_CAST(inode); - if (generation && inode->i_generation != generation) { - iput(inode); - return ERR_PTR(-ESTALE); - } - - return inode; -} - -static struct dentry *ext3_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, - ext3_nfs_get_inode); -} - -static struct dentry *ext3_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, - ext3_nfs_get_inode); -} - -/* - * Try to release metadata pages (indirect blocks, directories) which are - * mapped via the block device. Since these pages could have journal heads - * which would prevent try_to_free_buffers() from freeing them, we must use - * jbd layer's try_to_free_buffers() function to release them. - */ -static int bdev_try_to_free_page(struct super_block *sb, struct page *page, - gfp_t wait) -{ - journal_t *journal = EXT3_SB(sb)->s_journal; - - WARN_ON(PageChecked(page)); - if (!page_has_buffers(page)) - return 0; - if (journal) - return journal_try_to_free_buffers(journal, page, - wait & ~__GFP_WAIT); - return try_to_free_buffers(page); -} - -#ifdef CONFIG_QUOTA -#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") -#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) - -static int ext3_write_dquot(struct dquot *dquot); -static int ext3_acquire_dquot(struct dquot *dquot); -static int ext3_release_dquot(struct dquot *dquot); -static int ext3_mark_dquot_dirty(struct dquot *dquot); -static int ext3_write_info(struct super_block *sb, int type); -static int ext3_quota_on(struct super_block *sb, int type, int format_id, - struct path *path); -static int ext3_quota_on_mount(struct super_block *sb, int type); -static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data, - size_t len, loff_t off); -static ssize_t ext3_quota_write(struct super_block *sb, int type, - const char *data, size_t len, loff_t off); -static struct dquot **ext3_get_dquots(struct inode *inode) -{ - return EXT3_I(inode)->i_dquot; -} - -static const struct dquot_operations ext3_quota_operations = { - .write_dquot = ext3_write_dquot, - .acquire_dquot = ext3_acquire_dquot, - .release_dquot = ext3_release_dquot, - .mark_dirty = ext3_mark_dquot_dirty, - .write_info = ext3_write_info, - .alloc_dquot = dquot_alloc, - .destroy_dquot = dquot_destroy, -}; - -static const struct quotactl_ops ext3_qctl_operations = { - .quota_on = ext3_quota_on, - .quota_off = dquot_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 -}; -#endif - -static const struct super_operations ext3_sops = { - .alloc_inode = ext3_alloc_inode, - .destroy_inode = ext3_destroy_inode, - .write_inode = ext3_write_inode, - .dirty_inode = ext3_dirty_inode, - .drop_inode = ext3_drop_inode, - .evict_inode = ext3_evict_inode, - .put_super = ext3_put_super, - .sync_fs = ext3_sync_fs, - .freeze_fs = ext3_freeze, - .unfreeze_fs = ext3_unfreeze, - .statfs = ext3_statfs, - .remount_fs = ext3_remount, - .show_options = ext3_show_options, -#ifdef CONFIG_QUOTA - .quota_read = ext3_quota_read, - .quota_write = ext3_quota_write, - .get_dquots = ext3_get_dquots, -#endif - .bdev_try_to_free_page = bdev_try_to_free_page, -}; - -static const struct export_operations ext3_export_ops = { - .fh_to_dentry = ext3_fh_to_dentry, - .fh_to_parent = ext3_fh_to_parent, - .get_parent = ext3_get_parent, -}; - -enum { - Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, - Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, - Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, - Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, - Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, - Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, - Opt_journal_path, - Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, - Opt_data_err_abort, Opt_data_err_ignore, - Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, - Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, - Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err, - Opt_resize, Opt_usrquota, Opt_grpquota -}; - -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_nocheck, "nocheck"}, - {Opt_nocheck, "check=none"}, - {Opt_debug, "debug"}, - {Opt_oldalloc, "oldalloc"}, - {Opt_orlov, "orlov"}, - {Opt_user_xattr, "user_xattr"}, - {Opt_nouser_xattr, "nouser_xattr"}, - {Opt_acl, "acl"}, - {Opt_noacl, "noacl"}, - {Opt_reservation, "reservation"}, - {Opt_noreservation, "noreservation"}, - {Opt_noload, "noload"}, - {Opt_noload, "norecovery"}, - {Opt_nobh, "nobh"}, - {Opt_bh, "bh"}, - {Opt_commit, "commit=%u"}, - {Opt_journal_update, "journal=update"}, - {Opt_journal_inum, "journal=%u"}, - {Opt_journal_dev, "journal_dev=%u"}, - {Opt_journal_path, "journal_path=%s"}, - {Opt_abort, "abort"}, - {Opt_data_journal, "data=journal"}, - {Opt_data_ordered, "data=ordered"}, - {Opt_data_writeback, "data=writeback"}, - {Opt_data_err_abort, "data_err=abort"}, - {Opt_data_err_ignore, "data_err=ignore"}, - {Opt_offusrjquota, "usrjquota="}, - {Opt_usrjquota, "usrjquota=%s"}, - {Opt_offgrpjquota, "grpjquota="}, - {Opt_grpjquota, "grpjquota=%s"}, - {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, - {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, - {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"}, - {Opt_grpquota, "grpquota"}, - {Opt_noquota, "noquota"}, - {Opt_quota, "quota"}, - {Opt_usrquota, "usrquota"}, - {Opt_barrier, "barrier=%u"}, - {Opt_barrier, "barrier"}, - {Opt_nobarrier, "nobarrier"}, - {Opt_resize, "resize"}, - {Opt_err, NULL}, -}; - -static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb) -{ - ext3_fsblk_t sb_block; - char *options = (char *) *data; - - if (!options || strncmp(options, "sb=", 3) != 0) - return 1; /* Default location */ - options += 3; - /*todo: use simple_strtoll with >32bit ext3 */ - sb_block = simple_strtoul(options, &options, 0); - if (*options && *options != ',') { - ext3_msg(sb, KERN_ERR, "error: invalid sb specification: %s", - (char *) *data); - return 1; - } - if (*options == ',') - options++; - *data = (void *) options; - return sb_block; -} - -#ifdef CONFIG_QUOTA -static int set_qf_name(struct super_block *sb, int qtype, substring_t *args) -{ - struct ext3_sb_info *sbi = EXT3_SB(sb); - char *qname; - - if (sb_any_quota_loaded(sb) && - !sbi->s_qf_names[qtype]) { - ext3_msg(sb, KERN_ERR, - "Cannot change journaled " - "quota options when quota turned on"); - return 0; - } - qname = match_strdup(args); - if (!qname) { - ext3_msg(sb, KERN_ERR, - "Not enough memory for storing quotafile name"); - return 0; - } - if (sbi->s_qf_names[qtype]) { - int same = !strcmp(sbi->s_qf_names[qtype], qname); - - kfree(qname); - if (!same) { - ext3_msg(sb, KERN_ERR, - "%s quota file already specified", - QTYPE2NAME(qtype)); - } - return same; - } - if (strchr(qname, '/')) { - ext3_msg(sb, KERN_ERR, - "quotafile must be on filesystem root"); - kfree(qname); - return 0; - } - sbi->s_qf_names[qtype] = qname; - set_opt(sbi->s_mount_opt, QUOTA); - return 1; -} - -static int clear_qf_name(struct super_block *sb, int qtype) { - - struct ext3_sb_info *sbi = EXT3_SB(sb); - - if (sb_any_quota_loaded(sb) && - sbi->s_qf_names[qtype]) { - ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options" - " when quota turned on"); - return 0; - } - if (sbi->s_qf_names[qtype]) { - kfree(sbi->s_qf_names[qtype]); - sbi->s_qf_names[qtype] = NULL; - } - return 1; -} -#endif - -static int parse_options (char *options, struct super_block *sb, - unsigned int *inum, unsigned long *journal_devnum, - ext3_fsblk_t *n_blocks_count, int is_remount) -{ - struct ext3_sb_info *sbi = EXT3_SB(sb); - char * p; - substring_t args[MAX_OPT_ARGS]; - int data_opt = 0; - int option; - kuid_t uid; - kgid_t gid; - char *journal_path; - struct inode *journal_inode; - struct path path; - int error; - -#ifdef CONFIG_QUOTA - int qfmt; -#endif - - if (!options) - return 1; - - while ((p = strsep (&options, ",")) != NULL) { - int token; - if (!*p) - continue; - /* - * Initialize args struct so we know whether arg was - * found; some options take optional arguments. - */ - args[0].to = args[0].from = NULL; - token = match_token(p, tokens, args); - switch (token) { - case Opt_bsd_df: - clear_opt (sbi->s_mount_opt, MINIX_DF); - break; - case Opt_minix_df: - set_opt (sbi->s_mount_opt, MINIX_DF); - break; - case Opt_grpid: - set_opt (sbi->s_mount_opt, GRPID); - break; - case Opt_nogrpid: - clear_opt (sbi->s_mount_opt, GRPID); - break; - case Opt_resuid: - if (match_int(&args[0], &option)) - return 0; - uid = make_kuid(current_user_ns(), option); - if (!uid_valid(uid)) { - ext3_msg(sb, KERN_ERR, "Invalid uid value %d", option); - return 0; - - } - sbi->s_resuid = uid; - break; - case Opt_resgid: - if (match_int(&args[0], &option)) - return 0; - gid = make_kgid(current_user_ns(), option); - if (!gid_valid(gid)) { - ext3_msg(sb, KERN_ERR, "Invalid gid value %d", option); - return 0; - } - sbi->s_resgid = gid; - break; - case Opt_sb: - /* handled by get_sb_block() instead of here */ - /* *sb_block = match_int(&args[0]); */ - break; - case Opt_err_panic: - clear_opt (sbi->s_mount_opt, ERRORS_CONT); - clear_opt (sbi->s_mount_opt, ERRORS_RO); - set_opt (sbi->s_mount_opt, ERRORS_PANIC); - break; - case Opt_err_ro: - clear_opt (sbi->s_mount_opt, ERRORS_CONT); - clear_opt (sbi->s_mount_opt, ERRORS_PANIC); - set_opt (sbi->s_mount_opt, ERRORS_RO); - break; - case Opt_err_cont: - clear_opt (sbi->s_mount_opt, ERRORS_RO); - clear_opt (sbi->s_mount_opt, ERRORS_PANIC); - set_opt (sbi->s_mount_opt, ERRORS_CONT); - break; - case Opt_nouid32: - set_opt (sbi->s_mount_opt, NO_UID32); - break; - case Opt_nocheck: - clear_opt (sbi->s_mount_opt, CHECK); - break; - case Opt_debug: - set_opt (sbi->s_mount_opt, DEBUG); - break; - case Opt_oldalloc: - ext3_msg(sb, KERN_WARNING, - "Ignoring deprecated oldalloc option"); - break; - case Opt_orlov: - ext3_msg(sb, KERN_WARNING, - "Ignoring deprecated orlov option"); - break; -#ifdef CONFIG_EXT3_FS_XATTR - case Opt_user_xattr: - set_opt (sbi->s_mount_opt, XATTR_USER); - break; - case Opt_nouser_xattr: - clear_opt (sbi->s_mount_opt, XATTR_USER); - break; -#else - case Opt_user_xattr: - case Opt_nouser_xattr: - ext3_msg(sb, KERN_INFO, - "(no)user_xattr options not supported"); - break; -#endif -#ifdef CONFIG_EXT3_FS_POSIX_ACL - case Opt_acl: - set_opt(sbi->s_mount_opt, POSIX_ACL); - break; - case Opt_noacl: - clear_opt(sbi->s_mount_opt, POSIX_ACL); - break; -#else - case Opt_acl: - case Opt_noacl: - ext3_msg(sb, KERN_INFO, - "(no)acl options not supported"); - break; -#endif - case Opt_reservation: - set_opt(sbi->s_mount_opt, RESERVATION); - break; - case Opt_noreservation: - clear_opt(sbi->s_mount_opt, RESERVATION); - break; - case Opt_journal_update: - /* @@@ FIXME */ - /* Eventually we will want to be able to create - a journal file here. For now, only allow the - user to specify an existing inode to be the - journal file. */ - if (is_remount) { - ext3_msg(sb, KERN_ERR, "error: cannot specify " - "journal on remount"); - return 0; - } - set_opt (sbi->s_mount_opt, UPDATE_JOURNAL); - break; - case Opt_journal_inum: - if (is_remount) { - ext3_msg(sb, KERN_ERR, "error: cannot specify " - "journal on remount"); - return 0; - } - if (match_int(&args[0], &option)) - return 0; - *inum = option; - break; - case Opt_journal_dev: - if (is_remount) { - ext3_msg(sb, KERN_ERR, "error: cannot specify " - "journal on remount"); - return 0; - } - if (match_int(&args[0], &option)) - return 0; - *journal_devnum = option; - break; - case Opt_journal_path: - if (is_remount) { - ext3_msg(sb, KERN_ERR, "error: cannot specify " - "journal on remount"); - return 0; - } - - journal_path = match_strdup(&args[0]); - if (!journal_path) { - ext3_msg(sb, KERN_ERR, "error: could not dup " - "journal device string"); - return 0; - } - - error = kern_path(journal_path, LOOKUP_FOLLOW, &path); - if (error) { - ext3_msg(sb, KERN_ERR, "error: could not find " - "journal device path: error %d", error); - kfree(journal_path); - return 0; - } - - journal_inode = d_inode(path.dentry); - if (!S_ISBLK(journal_inode->i_mode)) { - ext3_msg(sb, KERN_ERR, "error: journal path %s " - "is not a block device", journal_path); - path_put(&path); - kfree(journal_path); - return 0; - } - - *journal_devnum = new_encode_dev(journal_inode->i_rdev); - path_put(&path); - kfree(journal_path); - break; - case Opt_noload: - set_opt (sbi->s_mount_opt, NOLOAD); - break; - case Opt_commit: - if (match_int(&args[0], &option)) - return 0; - if (option < 0) - return 0; - if (option == 0) - option = JBD_DEFAULT_MAX_COMMIT_AGE; - sbi->s_commit_interval = HZ * option; - break; - case Opt_data_journal: - data_opt = EXT3_MOUNT_JOURNAL_DATA; - goto datacheck; - case Opt_data_ordered: - data_opt = EXT3_MOUNT_ORDERED_DATA; - goto datacheck; - case Opt_data_writeback: - data_opt = EXT3_MOUNT_WRITEBACK_DATA; - datacheck: - if (is_remount) { - if (test_opt(sb, DATA_FLAGS) == data_opt) - break; - ext3_msg(sb, KERN_ERR, - "error: cannot change " - "data mode on remount. The filesystem " - "is mounted in data=%s mode and you " - "try to remount it in data=%s mode.", - data_mode_string(test_opt(sb, - DATA_FLAGS)), - data_mode_string(data_opt)); - return 0; - } else { - clear_opt(sbi->s_mount_opt, DATA_FLAGS); - sbi->s_mount_opt |= data_opt; - } - break; - case Opt_data_err_abort: - set_opt(sbi->s_mount_opt, DATA_ERR_ABORT); - break; - case Opt_data_err_ignore: - clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT); - break; -#ifdef CONFIG_QUOTA - case Opt_usrjquota: - if (!set_qf_name(sb, USRQUOTA, &args[0])) - return 0; - break; - case Opt_grpjquota: - if (!set_qf_name(sb, GRPQUOTA, &args[0])) - return 0; - break; - case Opt_offusrjquota: - if (!clear_qf_name(sb, USRQUOTA)) - return 0; - break; - case Opt_offgrpjquota: - if (!clear_qf_name(sb, GRPQUOTA)) - return 0; - break; - case Opt_jqfmt_vfsold: - qfmt = QFMT_VFS_OLD; - goto set_qf_format; - case Opt_jqfmt_vfsv0: - qfmt = QFMT_VFS_V0; - goto set_qf_format; - case Opt_jqfmt_vfsv1: - qfmt = QFMT_VFS_V1; -set_qf_format: - if (sb_any_quota_loaded(sb) && - sbi->s_jquota_fmt != qfmt) { - ext3_msg(sb, KERN_ERR, "error: cannot change " - "journaled quota options when " - "quota turned on."); - return 0; - } - sbi->s_jquota_fmt = qfmt; - break; - case Opt_quota: - case Opt_usrquota: - set_opt(sbi->s_mount_opt, QUOTA); - set_opt(sbi->s_mount_opt, USRQUOTA); - break; - case Opt_grpquota: - set_opt(sbi->s_mount_opt, QUOTA); - set_opt(sbi->s_mount_opt, GRPQUOTA); - break; - case Opt_noquota: - if (sb_any_quota_loaded(sb)) { - ext3_msg(sb, KERN_ERR, "error: cannot change " - "quota options when quota turned on."); - return 0; - } - clear_opt(sbi->s_mount_opt, QUOTA); - clear_opt(sbi->s_mount_opt, USRQUOTA); - clear_opt(sbi->s_mount_opt, GRPQUOTA); - break; -#else - case Opt_quota: - case Opt_usrquota: - case Opt_grpquota: - ext3_msg(sb, KERN_ERR, - "error: quota options not supported."); - break; - case Opt_usrjquota: - case Opt_grpjquota: - case Opt_offusrjquota: - case Opt_offgrpjquota: - case Opt_jqfmt_vfsold: - case Opt_jqfmt_vfsv0: - case Opt_jqfmt_vfsv1: - ext3_msg(sb, KERN_ERR, - "error: journaled quota options not " - "supported."); - break; - case Opt_noquota: - break; -#endif - case Opt_abort: - set_opt(sbi->s_mount_opt, ABORT); - break; - case Opt_nobarrier: - clear_opt(sbi->s_mount_opt, BARRIER); - break; - case Opt_barrier: - if (args[0].from) { - if (match_int(&args[0], &option)) - return 0; - } else - option = 1; /* No argument, default to 1 */ - if (option) - set_opt(sbi->s_mount_opt, BARRIER); - else - clear_opt(sbi->s_mount_opt, BARRIER); - break; - case Opt_ignore: - break; - case Opt_resize: - if (!is_remount) { - ext3_msg(sb, KERN_ERR, - "error: resize option only available " - "for remount"); - return 0; - } - if (match_int(&args[0], &option) != 0) - return 0; - *n_blocks_count = option; - break; - case Opt_nobh: - ext3_msg(sb, KERN_WARNING, - "warning: ignoring deprecated nobh option"); - break; - case Opt_bh: - ext3_msg(sb, KERN_WARNING, - "warning: ignoring deprecated bh option"); - break; - default: - ext3_msg(sb, KERN_ERR, - "error: unrecognized mount option \"%s\" " - "or missing value", p); - return 0; - } - } -#ifdef CONFIG_QUOTA - if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { - if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA]) - clear_opt(sbi->s_mount_opt, USRQUOTA); - if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA]) - clear_opt(sbi->s_mount_opt, GRPQUOTA); - - if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) { - ext3_msg(sb, KERN_ERR, "error: old and new quota " - "format mixing."); - return 0; - } - - if (!sbi->s_jquota_fmt) { - ext3_msg(sb, KERN_ERR, "error: journaled quota format " - "not specified."); - return 0; - } - } -#endif - return 1; -} - -static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es, - int read_only) -{ - struct ext3_sb_info *sbi = EXT3_SB(sb); - int res = 0; - - if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) { - ext3_msg(sb, KERN_ERR, - "error: revision level too high, " - "forcing read-only mode"); - res = MS_RDONLY; - } - if (read_only) - return res; - if (!(sbi->s_mount_state & EXT3_VALID_FS)) - ext3_msg(sb, KERN_WARNING, - "warning: mounting unchecked fs, " - "running e2fsck is recommended"); - else if ((sbi->s_mount_state & EXT3_ERROR_FS)) - ext3_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) >= - le16_to_cpu(es->s_max_mnt_count)) - ext3_msg(sb, KERN_WARNING, - "warning: maximal mount count reached, " - "running e2fsck is recommended"); - else if (le32_to_cpu(es->s_checkinterval) && - (le32_to_cpu(es->s_lastcheck) + - le32_to_cpu(es->s_checkinterval) <= get_seconds())) - ext3_msg(sb, KERN_WARNING, - "warning: checktime reached, " - "running e2fsck is recommended"); -#if 0 - /* @@@ We _will_ want to clear the valid bit if we find - inconsistencies, to force a fsck at reboot. But for - a plain journaled filesystem we can keep it set as - valid forever! :) */ - es->s_state &= cpu_to_le16(~EXT3_VALID_FS); -#endif - if (!le16_to_cpu(es->s_max_mnt_count)) - es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT); - le16_add_cpu(&es->s_mnt_count, 1); - es->s_mtime = cpu_to_le32(get_seconds()); - ext3_update_dynamic_rev(sb); - EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); - - ext3_commit_super(sb, es, 1); - if (test_opt(sb, DEBUG)) - ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, " - "bpg=%lu, ipg=%lu, mo=%04lx]", - sb->s_blocksize, - sbi->s_groups_count, - EXT3_BLOCKS_PER_GROUP(sb), - EXT3_INODES_PER_GROUP(sb), - sbi->s_mount_opt); - - if (EXT3_SB(sb)->s_journal->j_inode == NULL) { - char b[BDEVNAME_SIZE]; - ext3_msg(sb, KERN_INFO, "using external journal on %s", - bdevname(EXT3_SB(sb)->s_journal->j_dev, b)); - } else { - ext3_msg(sb, KERN_INFO, "using internal journal"); - } - cleancache_init_fs(sb); - return res; -} - -/* Called at mount-time, super-block is locked */ -static int ext3_check_descriptors(struct super_block *sb) -{ - struct ext3_sb_info *sbi = EXT3_SB(sb); - int i; - - ext3_debug ("Checking group descriptors"); - - for (i = 0; i < sbi->s_groups_count; i++) { - struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL); - ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i); - ext3_fsblk_t last_block; - - if (i == sbi->s_groups_count - 1) - last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; - else - last_block = first_block + - (EXT3_BLOCKS_PER_GROUP(sb) - 1); - - if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || - le32_to_cpu(gdp->bg_block_bitmap) > last_block) - { - ext3_error (sb, "ext3_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) - { - ext3_error (sb, "ext3_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) - { - ext3_error (sb, "ext3_check_descriptors", - "Inode table for group %d" - " not in group (block %lu)!", - i, (unsigned long) - le32_to_cpu(gdp->bg_inode_table)); - return 0; - } - } - - sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb)); - sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb)); - return 1; -} - - -/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at - * the superblock) which were deleted from all directories, but held open by - * a process at the time of a crash. We walk the list and try to delete these - * inodes at recovery time (only with a read-write filesystem). - * - * In order to keep the orphan inode chain consistent during traversal (in - * case of crash during recovery), we link each inode into the superblock - * orphan list_head and handle it the same way as an inode deletion during - * normal operation (which journals the operations for us). - * - * We only do an iget() and an iput() on each inode, which is very safe if we - * accidentally point at an in-use or already deleted inode. The worst that - * can happen in this case is that we get a "bit already cleared" message from - * ext3_free_inode(). The only reason we would point at a wrong inode is if - * e2fsck was run on this filesystem, and it must have already done the orphan - * inode cleanup for us, so we can safely abort without any further action. - */ -static void ext3_orphan_cleanup (struct super_block * sb, - struct ext3_super_block * es) -{ - unsigned int s_flags = sb->s_flags; - int nr_orphans = 0, nr_truncates = 0; -#ifdef CONFIG_QUOTA - int i; -#endif - if (!es->s_last_orphan) { - jbd_debug(4, "no orphan inodes to clean up\n"); - return; - } - - if (bdev_read_only(sb->s_bdev)) { - ext3_msg(sb, KERN_ERR, "error: write access " - "unavailable, skipping orphan cleanup."); - return; - } - - /* Check if feature set allows readwrite operations */ - if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) { - ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to " - "unknown ROCOMPAT features"); - return; - } - - if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) { - /* don't clear list on RO mount w/ errors */ - if (es->s_last_orphan && !(s_flags & MS_RDONLY)) { - jbd_debug(1, "Errors on filesystem, " - "clearing orphan list.\n"); - es->s_last_orphan = 0; - } - jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); - return; - } - - if (s_flags & MS_RDONLY) { - ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs"); - sb->s_flags &= ~MS_RDONLY; - } -#ifdef CONFIG_QUOTA - /* Needed for iput() to work correctly and not trash data */ - sb->s_flags |= MS_ACTIVE; - /* Turn on quotas so that they are updated correctly */ - for (i = 0; i < EXT3_MAXQUOTAS; i++) { - if (EXT3_SB(sb)->s_qf_names[i]) { - int ret = ext3_quota_on_mount(sb, i); - if (ret < 0) - ext3_msg(sb, KERN_ERR, - "error: cannot turn on journaled " - "quota: %d", ret); - } - } -#endif - - while (es->s_last_orphan) { - struct inode *inode; - - inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); - if (IS_ERR(inode)) { - es->s_last_orphan = 0; - break; - } - - list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan); - dquot_initialize(inode); - if (inode->i_nlink) { - printk(KERN_DEBUG - "%s: truncating inode %lu to %Ld bytes\n", - __func__, inode->i_ino, inode->i_size); - jbd_debug(2, "truncating inode %lu to %Ld bytes\n", - inode->i_ino, inode->i_size); - ext3_truncate(inode); - nr_truncates++; - } else { - printk(KERN_DEBUG - "%s: deleting unreferenced inode %lu\n", - __func__, inode->i_ino); - jbd_debug(2, "deleting unreferenced inode %lu\n", - inode->i_ino); - nr_orphans++; - } - iput(inode); /* The delete magic happens here! */ - } - -#define PLURAL(x) (x), ((x)==1) ? "" : "s" - - if (nr_orphans) - ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted", - PLURAL(nr_orphans)); - if (nr_truncates) - ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up", - PLURAL(nr_truncates)); -#ifdef CONFIG_QUOTA - /* Turn quotas off */ - for (i = 0; i < EXT3_MAXQUOTAS; i++) { - if (sb_dqopt(sb)->files[i]) - dquot_quota_off(sb, i); - } -#endif - sb->s_flags = s_flags; /* Restore MS_RDONLY status */ -} - -/* - * 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 ext3_max_size(int bits) -{ - loff_t res = EXT3_NDIR_BLOCKS; - int meta_blocks; - loff_t upper_limit; - - /* This is calculated to be the largest file size for a - * dense, file such that the total number of - * sectors in the file, including data and all indirect blocks, - * does not exceed 2^32 -1 - * __u32 i_blocks representing the total number of - * 512 bytes blocks of the file - */ - upper_limit = (1LL << 32) - 1; - - /* total blocks in file system block size */ - upper_limit >>= (bits - 9); - - - /* indirect blocks */ - meta_blocks = 1; - /* double indirect blocks */ - meta_blocks += 1 + (1LL << (bits-2)); - /* tripple indirect blocks */ - meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); - - upper_limit -= meta_blocks; - upper_limit <<= bits; - - res += 1LL << (bits-2); - res += 1LL << (2*(bits-2)); - res += 1LL << (3*(bits-2)); - res <<= bits; - if (res > upper_limit) - res = upper_limit; - - if (res > MAX_LFS_FILESIZE) - res = MAX_LFS_FILESIZE; - - return res; -} - -static ext3_fsblk_t descriptor_loc(struct super_block *sb, - ext3_fsblk_t logic_sb_block, - int nr) -{ - struct ext3_sb_info *sbi = EXT3_SB(sb); - unsigned long bg, first_meta_bg; - int has_super = 0; - - first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); - - if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) || - nr < first_meta_bg) - return (logic_sb_block + nr + 1); - bg = sbi->s_desc_per_block * nr; - if (ext3_bg_has_super(sb, bg)) - has_super = 1; - return (has_super + ext3_group_first_block_no(sb, bg)); -} - - -static int ext3_fill_super (struct super_block *sb, void *data, int silent) -{ - struct buffer_head * bh; - struct ext3_super_block *es = NULL; - struct ext3_sb_info *sbi; - ext3_fsblk_t block; - ext3_fsblk_t sb_block = get_sb_block(&data, sb); - ext3_fsblk_t logic_sb_block; - unsigned long offset = 0; - unsigned int journal_inum = 0; - unsigned long journal_devnum = 0; - unsigned long def_mount_opts; - struct inode *root; - int blocksize; - int hblock; - int db_count; - int i; - int needs_recovery; - int ret = -EINVAL; - __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; - - blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE); - if (!blocksize) { - ext3_msg(sb, KERN_ERR, "error: unable to set blocksize"); - goto out_fail; - } - - /* - * The ext3 superblock will not be buffer aligned for other than 1kB - * block sizes. We need to calculate the offset from buffer start. - */ - if (blocksize != EXT3_MIN_BLOCK_SIZE) { - logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize; - offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize; - } else { - logic_sb_block = sb_block; - } - - if (!(bh = sb_bread(sb, logic_sb_block))) { - ext3_msg(sb, KERN_ERR, "error: unable to read superblock"); - goto out_fail; - } - /* - * Note: s_es must be initialized as soon as possible because - * some ext3 macro-instructions depend on its value - */ - es = (struct ext3_super_block *) (bh->b_data + offset); - sbi->s_es = es; - sb->s_magic = le16_to_cpu(es->s_magic); - if (sb->s_magic != EXT3_SUPER_MAGIC) - goto cantfind_ext3; - - /* Set defaults before we parse the mount options */ - def_mount_opts = le32_to_cpu(es->s_default_mount_opts); - if (def_mount_opts & EXT3_DEFM_DEBUG) - set_opt(sbi->s_mount_opt, DEBUG); - if (def_mount_opts & EXT3_DEFM_BSDGROUPS) - set_opt(sbi->s_mount_opt, GRPID); - if (def_mount_opts & EXT3_DEFM_UID16) - set_opt(sbi->s_mount_opt, NO_UID32); -#ifdef CONFIG_EXT3_FS_XATTR - if (def_mount_opts & EXT3_DEFM_XATTR_USER) - set_opt(sbi->s_mount_opt, XATTR_USER); -#endif -#ifdef CONFIG_EXT3_FS_POSIX_ACL - if (def_mount_opts & EXT3_DEFM_ACL) - set_opt(sbi->s_mount_opt, POSIX_ACL); -#endif - if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA) - set_opt(sbi->s_mount_opt, JOURNAL_DATA); - else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED) - set_opt(sbi->s_mount_opt, ORDERED_DATA); - else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK) - set_opt(sbi->s_mount_opt, WRITEBACK_DATA); - - if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC) - set_opt(sbi->s_mount_opt, ERRORS_PANIC); - else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE) - set_opt(sbi->s_mount_opt, ERRORS_CONT); - else - set_opt(sbi->s_mount_opt, ERRORS_RO); - - sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); - sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); - - /* enable barriers by default */ - set_opt(sbi->s_mount_opt, BARRIER); - set_opt(sbi->s_mount_opt, RESERVATION); - - if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum, - NULL, 0)) - goto failed_mount; - - sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | - (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); - - if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV && - (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) || - EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) || - EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U))) - ext3_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 = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP); - if (features) { - ext3_msg(sb, KERN_ERR, - "error: couldn't mount because of unsupported " - "optional features (%x)", le32_to_cpu(features)); - goto failed_mount; - } - features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP); - if (!(sb->s_flags & MS_RDONLY) && features) { - ext3_msg(sb, KERN_ERR, - "error: couldn't mount RDWR because of unsupported " - "optional features (%x)", le32_to_cpu(features)); - goto failed_mount; - } - blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); - - if (blocksize < EXT3_MIN_BLOCK_SIZE || - blocksize > EXT3_MAX_BLOCK_SIZE) { - ext3_msg(sb, KERN_ERR, - "error: couldn't mount because of unsupported " - "filesystem blocksize %d", blocksize); - goto failed_mount; - } - - hblock = bdev_logical_block_size(sb->s_bdev); - if (sb->s_blocksize != blocksize) { - /* - * Make sure the blocksize for the filesystem is larger - * than the hardware sectorsize for the machine. - */ - if (blocksize < hblock) { - ext3_msg(sb, KERN_ERR, - "error: fsblocksize %d too small for " - "hardware sectorsize %d", blocksize, hblock); - goto failed_mount; - } - - brelse (bh); - if (!sb_set_blocksize(sb, blocksize)) { - ext3_msg(sb, KERN_ERR, - "error: bad blocksize %d", blocksize); - goto out_fail; - } - logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize; - offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize; - bh = sb_bread(sb, logic_sb_block); - if (!bh) { - ext3_msg(sb, KERN_ERR, - "error: can't read superblock on 2nd try"); - goto failed_mount; - } - es = (struct ext3_super_block *)(bh->b_data + offset); - sbi->s_es = es; - if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) { - ext3_msg(sb, KERN_ERR, - "error: magic mismatch"); - goto failed_mount; - } - } - - sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits); - - if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) { - sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE; - sbi->s_first_ino = EXT3_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 < EXT3_GOOD_OLD_INODE_SIZE) || - (!is_power_of_2(sbi->s_inode_size)) || - (sbi->s_inode_size > blocksize)) { - ext3_msg(sb, KERN_ERR, - "error: unsupported inode size: %d", - sbi->s_inode_size); - goto failed_mount; - } - } - sbi->s_frag_size = EXT3_MIN_FRAG_SIZE << - le32_to_cpu(es->s_log_frag_size); - if (blocksize != sbi->s_frag_size) { - ext3_msg(sb, KERN_ERR, - "error: fragsize %lu != blocksize %u (unsupported)", - sbi->s_frag_size, blocksize); - goto failed_mount; - } - sbi->s_frags_per_block = 1; - sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); - sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); - sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); - if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0) - goto cantfind_ext3; - sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb); - if (sbi->s_inodes_per_block == 0) - goto cantfind_ext3; - sbi->s_itb_per_group = sbi->s_inodes_per_group / - sbi->s_inodes_per_block; - sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc); - sbi->s_sbh = bh; - sbi->s_mount_state = le16_to_cpu(es->s_state); - sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb)); - sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb)); - for (i=0; i < 4; i++) - sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); - sbi->s_def_hash_version = es->s_def_hash_version; - i = le32_to_cpu(es->s_flags); - if (i & EXT2_FLAGS_UNSIGNED_HASH) - sbi->s_hash_unsigned = 3; - else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { -#ifdef __CHAR_UNSIGNED__ - es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); - sbi->s_hash_unsigned = 3; -#else - es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); -#endif - } - - if (sbi->s_blocks_per_group > blocksize * 8) { - ext3_msg(sb, KERN_ERR, - "#blocks per group too big: %lu", - sbi->s_blocks_per_group); - goto failed_mount; - } - if (sbi->s_frags_per_group > blocksize * 8) { - ext3_msg(sb, KERN_ERR, - "error: #fragments per group too big: %lu", - sbi->s_frags_per_group); - goto failed_mount; - } - if (sbi->s_inodes_per_group > blocksize * 8) { - ext3_msg(sb, KERN_ERR, - "error: #inodes per group too big: %lu", - sbi->s_inodes_per_group); - goto failed_mount; - } - - err = generic_check_addressable(sb->s_blocksize_bits, - le32_to_cpu(es->s_blocks_count)); - if (err) { - ext3_msg(sb, KERN_ERR, - "error: filesystem is too large to mount safely"); - if (sizeof(sector_t) < 8) - ext3_msg(sb, KERN_ERR, - "error: CONFIG_LBDAF not enabled"); - ret = err; - goto failed_mount; - } - - if (EXT3_BLOCKS_PER_GROUP(sb) == 0) - goto cantfind_ext3; - sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - - le32_to_cpu(es->s_first_data_block) - 1) - / EXT3_BLOCKS_PER_GROUP(sb)) + 1; - db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb)); - sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), - GFP_KERNEL); - if (sbi->s_group_desc == NULL) { - ext3_msg(sb, KERN_ERR, - "error: not enough memory"); - ret = -ENOMEM; - goto failed_mount; - } - - bgl_lock_init(sbi->s_blockgroup_lock); - - 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]) { - ext3_msg(sb, KERN_ERR, - "error: can't read group descriptor %d", i); - db_count = i; - goto failed_mount2; - } - } - if (!ext3_check_descriptors (sb)) { - ext3_msg(sb, KERN_ERR, - "error: group descriptors corrupted"); - goto failed_mount2; - } - sbi->s_gdb_count = db_count; - get_random_bytes(&sbi->s_next_generation, sizeof(u32)); - spin_lock_init(&sbi->s_next_gen_lock); - - /* per fileystem reservation list head & lock */ - spin_lock_init(&sbi->s_rsv_window_lock); - sbi->s_rsv_window_root = RB_ROOT; - /* Add a single, static dummy reservation to the start of the - * reservation window list --- it gives us a placeholder for - * append-at-start-of-list which makes the allocation logic - * _much_ simpler. */ - sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED; - sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED; - sbi->s_rsv_window_head.rsv_alloc_hit = 0; - sbi->s_rsv_window_head.rsv_goal_size = 0; - ext3_rsv_window_add(sb, &sbi->s_rsv_window_head); - - /* - * set up enough so that it can read an inode - */ - sb->s_op = &ext3_sops; - sb->s_export_op = &ext3_export_ops; - sb->s_xattr = ext3_xattr_handlers; -#ifdef CONFIG_QUOTA - sb->s_qcop = &ext3_qctl_operations; - sb->dq_op = &ext3_quota_operations; - sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; -#endif - memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid)); - INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ - mutex_init(&sbi->s_orphan_lock); - mutex_init(&sbi->s_resize_lock); - - sb->s_root = NULL; - - needs_recovery = (es->s_last_orphan != 0 || - EXT3_HAS_INCOMPAT_FEATURE(sb, - EXT3_FEATURE_INCOMPAT_RECOVER)); - - /* - * The first inode we look at is the journal inode. Don't try - * root first: it may be modified in the journal! - */ - if (!test_opt(sb, NOLOAD) && - EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) { - if (ext3_load_journal(sb, es, journal_devnum)) - goto failed_mount2; - } else if (journal_inum) { - if (ext3_create_journal(sb, es, journal_inum)) - goto failed_mount2; - } else { - if (!silent) - ext3_msg(sb, KERN_ERR, - "error: no journal found. " - "mounting ext3 over ext2?"); - goto failed_mount2; - } - err = percpu_counter_init(&sbi->s_freeblocks_counter, - ext3_count_free_blocks(sb), GFP_KERNEL); - if (!err) { - err = percpu_counter_init(&sbi->s_freeinodes_counter, - ext3_count_free_inodes(sb), GFP_KERNEL); - } - if (!err) { - err = percpu_counter_init(&sbi->s_dirs_counter, - ext3_count_dirs(sb), GFP_KERNEL); - } - if (err) { - ext3_msg(sb, KERN_ERR, "error: insufficient memory"); - ret = err; - goto failed_mount3; - } - - /* We have now updated the journal if required, so we can - * validate the data journaling mode. */ - switch (test_opt(sb, DATA_FLAGS)) { - case 0: - /* No mode set, assume a default based on the journal - capabilities: ORDERED_DATA if the journal can - cope, else JOURNAL_DATA */ - if (journal_check_available_features - (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) - set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE); - else - set_opt(sbi->s_mount_opt, JOURNAL_DATA); - break; - - case EXT3_MOUNT_ORDERED_DATA: - case EXT3_MOUNT_WRITEBACK_DATA: - if (!journal_check_available_features - (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) { - ext3_msg(sb, KERN_ERR, - "error: journal does not support " - "requested data journaling mode"); - goto failed_mount3; - } - default: - break; - } - - /* - * The journal_load will have done any necessary log recovery, - * so we can safely mount the rest of the filesystem now. - */ - - root = ext3_iget(sb, EXT3_ROOT_INO); - if (IS_ERR(root)) { - ext3_msg(sb, KERN_ERR, "error: get root inode failed"); - ret = PTR_ERR(root); - goto failed_mount3; - } - if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { - iput(root); - ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); - goto failed_mount3; - } - sb->s_root = d_make_root(root); - if (!sb->s_root) { - ext3_msg(sb, KERN_ERR, "error: get root dentry failed"); - ret = -ENOMEM; - goto failed_mount3; - } - - if (ext3_setup_super(sb, es, sb->s_flags & MS_RDONLY)) - sb->s_flags |= MS_RDONLY; - - EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS; - ext3_orphan_cleanup(sb, es); - EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS; - if (needs_recovery) { - ext3_mark_recovery_complete(sb, es); - ext3_msg(sb, KERN_INFO, "recovery complete"); - } - ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode", - test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal": - test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered": - "writeback"); - - return 0; - -cantfind_ext3: - if (!silent) - ext3_msg(sb, KERN_INFO, - "error: can't find ext3 filesystem on dev %s.", - sb->s_id); - goto failed_mount; - -failed_mount3: - percpu_counter_destroy(&sbi->s_freeblocks_counter); - percpu_counter_destroy(&sbi->s_freeinodes_counter); - percpu_counter_destroy(&sbi->s_dirs_counter); - journal_destroy(sbi->s_journal); -failed_mount2: - for (i = 0; i < db_count; i++) - brelse(sbi->s_group_desc[i]); - kfree(sbi->s_group_desc); -failed_mount: -#ifdef CONFIG_QUOTA - for (i = 0; i < EXT3_MAXQUOTAS; i++) - kfree(sbi->s_qf_names[i]); -#endif - ext3_blkdev_remove(sbi); - brelse(bh); -out_fail: - sb->s_fs_info = NULL; - kfree(sbi->s_blockgroup_lock); - kfree(sbi); - return ret; -} - -/* - * Setup any per-fs journal parameters now. We'll do this both on - * initial mount, once the journal has been initialised but before we've - * done any recovery; and again on any subsequent remount. - */ -static void ext3_init_journal_params(struct super_block *sb, journal_t *journal) -{ - struct ext3_sb_info *sbi = EXT3_SB(sb); - - if (sbi->s_commit_interval) - journal->j_commit_interval = sbi->s_commit_interval; - /* We could also set up an ext3-specific default for the commit - * interval here, but for now we'll just fall back to the jbd - * default. */ - - spin_lock(&journal->j_state_lock); - if (test_opt(sb, BARRIER)) - journal->j_flags |= JFS_BARRIER; - else - journal->j_flags &= ~JFS_BARRIER; - if (test_opt(sb, DATA_ERR_ABORT)) - journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR; - else - journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR; - spin_unlock(&journal->j_state_lock); -} - -static journal_t *ext3_get_journal(struct super_block *sb, - unsigned int journal_inum) -{ - struct inode *journal_inode; - journal_t *journal; - - /* First, test for the existence of a valid inode on disk. Bad - * things happen if we iget() an unused inode, as the subsequent - * iput() will try to delete it. */ - - journal_inode = ext3_iget(sb, journal_inum); - if (IS_ERR(journal_inode)) { - ext3_msg(sb, KERN_ERR, "error: no journal found"); - return NULL; - } - if (!journal_inode->i_nlink) { - make_bad_inode(journal_inode); - iput(journal_inode); - ext3_msg(sb, KERN_ERR, "error: journal inode is deleted"); - return NULL; - } - - jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", - journal_inode, journal_inode->i_size); - if (!S_ISREG(journal_inode->i_mode)) { - ext3_msg(sb, KERN_ERR, "error: invalid journal inode"); - iput(journal_inode); - return NULL; - } - - journal = journal_init_inode(journal_inode); - if (!journal) { - ext3_msg(sb, KERN_ERR, "error: could not load journal inode"); - iput(journal_inode); - return NULL; - } - journal->j_private = sb; - ext3_init_journal_params(sb, journal); - return journal; -} - -static journal_t *ext3_get_dev_journal(struct super_block *sb, - dev_t j_dev) -{ - struct buffer_head * bh; - journal_t *journal; - ext3_fsblk_t start; - ext3_fsblk_t len; - int hblock, blocksize; - ext3_fsblk_t sb_block; - unsigned long offset; - struct ext3_super_block * es; - struct block_device *bdev; - - bdev = ext3_blkdev_get(j_dev, sb); - if (bdev == NULL) - return NULL; - - blocksize = sb->s_blocksize; - hblock = bdev_logical_block_size(bdev); - if (blocksize < hblock) { - ext3_msg(sb, KERN_ERR, - "error: blocksize too small for journal device"); - goto out_bdev; - } - - sb_block = EXT3_MIN_BLOCK_SIZE / blocksize; - offset = EXT3_MIN_BLOCK_SIZE % blocksize; - set_blocksize(bdev, blocksize); - if (!(bh = __bread(bdev, sb_block, blocksize))) { - ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of " - "external journal"); - goto out_bdev; - } - - es = (struct ext3_super_block *) (bh->b_data + offset); - if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) || - !(le32_to_cpu(es->s_feature_incompat) & - EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) { - ext3_msg(sb, KERN_ERR, "error: external journal has " - "bad superblock"); - brelse(bh); - goto out_bdev; - } - - if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { - ext3_msg(sb, KERN_ERR, "error: journal UUID does not match"); - brelse(bh); - goto out_bdev; - } - - len = le32_to_cpu(es->s_blocks_count); - start = sb_block + 1; - brelse(bh); /* we're done with the superblock */ - - journal = journal_init_dev(bdev, sb->s_bdev, - start, len, blocksize); - if (!journal) { - ext3_msg(sb, KERN_ERR, - "error: failed to create device journal"); - goto out_bdev; - } - journal->j_private = sb; - if (!bh_uptodate_or_lock(journal->j_sb_buffer)) { - if (bh_submit_read(journal->j_sb_buffer)) { - ext3_msg(sb, KERN_ERR, "I/O error on journal device"); - goto out_journal; - } - } - if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { - ext3_msg(sb, KERN_ERR, - "error: external journal has more than one " - "user (unsupported) - %d", - be32_to_cpu(journal->j_superblock->s_nr_users)); - goto out_journal; - } - EXT3_SB(sb)->journal_bdev = bdev; - ext3_init_journal_params(sb, journal); - return journal; -out_journal: - journal_destroy(journal); -out_bdev: - ext3_blkdev_put(bdev); - return NULL; -} - -static int ext3_load_journal(struct super_block *sb, - struct ext3_super_block *es, - unsigned long journal_devnum) -{ - journal_t *journal; - unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); - dev_t journal_dev; - int err = 0; - int really_read_only; - - if (journal_devnum && - journal_devnum != le32_to_cpu(es->s_journal_dev)) { - ext3_msg(sb, KERN_INFO, "external journal device major/minor " - "numbers have changed"); - journal_dev = new_decode_dev(journal_devnum); - } else - journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); - - really_read_only = bdev_read_only(sb->s_bdev); - - /* - * Are we loading a blank journal or performing recovery after a - * crash? For recovery, we need to check in advance whether we - * can get read-write access to the device. - */ - - if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) { - if (sb->s_flags & MS_RDONLY) { - ext3_msg(sb, KERN_INFO, - "recovery required on readonly filesystem"); - if (really_read_only) { - ext3_msg(sb, KERN_ERR, "error: write access " - "unavailable, cannot proceed"); - return -EROFS; - } - ext3_msg(sb, KERN_INFO, - "write access will be enabled during recovery"); - } - } - - if (journal_inum && journal_dev) { - ext3_msg(sb, KERN_ERR, "error: filesystem has both journal " - "and inode journals"); - return -EINVAL; - } - - if (journal_inum) { - if (!(journal = ext3_get_journal(sb, journal_inum))) - return -EINVAL; - } else { - if (!(journal = ext3_get_dev_journal(sb, journal_dev))) - return -EINVAL; - } - - if (!(journal->j_flags & JFS_BARRIER)) - printk(KERN_INFO "EXT3-fs: barriers not enabled\n"); - - if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { - err = journal_update_format(journal); - if (err) { - ext3_msg(sb, KERN_ERR, "error updating journal"); - journal_destroy(journal); - return err; - } - } - - if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) - err = journal_wipe(journal, !really_read_only); - if (!err) - err = journal_load(journal); - - if (err) { - ext3_msg(sb, KERN_ERR, "error loading journal"); - journal_destroy(journal); - return err; - } - - EXT3_SB(sb)->s_journal = journal; - ext3_clear_journal_err(sb, es); - - if (!really_read_only && journal_devnum && - journal_devnum != le32_to_cpu(es->s_journal_dev)) { - es->s_journal_dev = cpu_to_le32(journal_devnum); - - /* Make sure we flush the recovery flag to disk. */ - ext3_commit_super(sb, es, 1); - } - - return 0; -} - -static int ext3_create_journal(struct super_block *sb, - struct ext3_super_block *es, - unsigned int journal_inum) -{ - journal_t *journal; - int err; - - if (sb->s_flags & MS_RDONLY) { - ext3_msg(sb, KERN_ERR, - "error: readonly filesystem when trying to " - "create journal"); - return -EROFS; - } - - journal = ext3_get_journal(sb, journal_inum); - if (!journal) - return -EINVAL; - - ext3_msg(sb, KERN_INFO, "creating new journal on inode %u", - journal_inum); - - err = journal_create(journal); - if (err) { - ext3_msg(sb, KERN_ERR, "error creating journal"); - journal_destroy(journal); - return -EIO; - } - - EXT3_SB(sb)->s_journal = journal; - - ext3_update_dynamic_rev(sb); - EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); - EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL); - - es->s_journal_inum = cpu_to_le32(journal_inum); - - /* Make sure we flush the recovery flag to disk. */ - ext3_commit_super(sb, es, 1); - - return 0; -} - -static int ext3_commit_super(struct super_block *sb, - struct ext3_super_block *es, - int sync) -{ - struct buffer_head *sbh = EXT3_SB(sb)->s_sbh; - int error = 0; - - if (!sbh) - return error; - - 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. - */ - ext3_msg(sb, KERN_ERR, "previous I/O error to " - "superblock detected"); - clear_buffer_write_io_error(sbh); - set_buffer_uptodate(sbh); - } - /* - * If the file system is mounted read-only, don't update the - * superblock write time. This avoids updating the superblock - * write time when we are mounting the root file system - * read/only but we need to replay the journal; at that point, - * for people who are east of GMT and who make their clock - * tick in localtime for Windows bug-for-bug compatibility, - * the clock is set in the future, and this will cause e2fsck - * to complain and force a full file system check. - */ - if (!(sb->s_flags & MS_RDONLY)) - es->s_wtime = cpu_to_le32(get_seconds()); - es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb)); - es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb)); - BUFFER_TRACE(sbh, "marking dirty"); - mark_buffer_dirty(sbh); - if (sync) { - error = sync_dirty_buffer(sbh); - if (buffer_write_io_error(sbh)) { - ext3_msg(sb, KERN_ERR, "I/O error while writing " - "superblock"); - clear_buffer_write_io_error(sbh); - set_buffer_uptodate(sbh); - } - } - return error; -} - - -/* - * Have we just finished recovery? If so, and if we are mounting (or - * remounting) the filesystem readonly, then we will end up with a - * consistent fs on disk. Record that fact. - */ -static void ext3_mark_recovery_complete(struct super_block * sb, - struct ext3_super_block * es) -{ - journal_t *journal = EXT3_SB(sb)->s_journal; - - journal_lock_updates(journal); - if (journal_flush(journal) < 0) - goto out; - - if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) && - sb->s_flags & MS_RDONLY) { - EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); - ext3_commit_super(sb, es, 1); - } - -out: - journal_unlock_updates(journal); -} - -/* - * If we are mounting (or read-write remounting) a filesystem whose journal - * has recorded an error from a previous lifetime, move that error to the - * main filesystem now. - */ -static void ext3_clear_journal_err(struct super_block *sb, - struct ext3_super_block *es) -{ - journal_t *journal; - int j_errno; - const char *errstr; - - journal = EXT3_SB(sb)->s_journal; - - /* - * Now check for any error status which may have been recorded in the - * journal by a prior ext3_error() or ext3_abort() - */ - - j_errno = journal_errno(journal); - if (j_errno) { - char nbuf[16]; - - errstr = ext3_decode_error(sb, j_errno, nbuf); - ext3_warning(sb, __func__, "Filesystem error recorded " - "from previous mount: %s", errstr); - ext3_warning(sb, __func__, "Marking fs in need of " - "filesystem check."); - - EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; - es->s_state |= cpu_to_le16(EXT3_ERROR_FS); - ext3_commit_super (sb, es, 1); - - journal_clear_err(journal); - } -} - -/* - * Force the running and committing transactions to commit, - * and wait on the commit. - */ -int ext3_force_commit(struct super_block *sb) -{ - journal_t *journal; - int ret; - - if (sb->s_flags & MS_RDONLY) - return 0; - - journal = EXT3_SB(sb)->s_journal; - ret = ext3_journal_force_commit(journal); - return ret; -} - -static int ext3_sync_fs(struct super_block *sb, int wait) -{ - tid_t target; - - trace_ext3_sync_fs(sb, wait); - /* - * Writeback quota in non-journalled quota case - journalled quota has - * no dirty dquots - */ - dquot_writeback_dquots(sb, -1); - if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) { - if (wait) - log_wait_commit(EXT3_SB(sb)->s_journal, target); - } - return 0; -} - -/* - * LVM calls this function before a (read-only) snapshot is created. This - * gives us a chance to flush the journal completely and mark the fs clean. - */ -static int ext3_freeze(struct super_block *sb) -{ - int error = 0; - journal_t *journal; - - if (!(sb->s_flags & MS_RDONLY)) { - journal = EXT3_SB(sb)->s_journal; - - /* Now we set up the journal barrier. */ - journal_lock_updates(journal); - - /* - * We don't want to clear needs_recovery flag when we failed - * to flush the journal. - */ - error = journal_flush(journal); - if (error < 0) - goto out; - - /* Journal blocked and flushed, clear needs_recovery flag. */ - EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); - error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1); - if (error) - goto out; - } - return 0; - -out: - journal_unlock_updates(journal); - return error; -} - -/* - * Called by LVM after the snapshot is done. We need to reset the RECOVER - * flag here, even though the filesystem is not technically dirty yet. - */ -static int ext3_unfreeze(struct super_block *sb) -{ - if (!(sb->s_flags & MS_RDONLY)) { - /* Reser the needs_recovery flag before the fs is unlocked. */ - EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); - ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1); - journal_unlock_updates(EXT3_SB(sb)->s_journal); - } - return 0; -} - -static int ext3_remount (struct super_block * sb, int * flags, char * data) -{ - struct ext3_super_block * es; - struct ext3_sb_info *sbi = EXT3_SB(sb); - ext3_fsblk_t n_blocks_count = 0; - unsigned long old_sb_flags; - struct ext3_mount_options old_opts; - int enable_quota = 0; - int err; -#ifdef CONFIG_QUOTA - int i; -#endif - - sync_filesystem(sb); - - /* Store the original options */ - old_sb_flags = sb->s_flags; - old_opts.s_mount_opt = sbi->s_mount_opt; - old_opts.s_resuid = sbi->s_resuid; - old_opts.s_resgid = sbi->s_resgid; - old_opts.s_commit_interval = sbi->s_commit_interval; -#ifdef CONFIG_QUOTA - old_opts.s_jquota_fmt = sbi->s_jquota_fmt; - for (i = 0; i < EXT3_MAXQUOTAS; i++) - if (sbi->s_qf_names[i]) { - old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i], - GFP_KERNEL); - if (!old_opts.s_qf_names[i]) { - int j; - - for (j = 0; j < i; j++) - kfree(old_opts.s_qf_names[j]); - return -ENOMEM; - } - } else - old_opts.s_qf_names[i] = NULL; -#endif - - /* - * Allow the "check" option to be passed as a remount option. - */ - if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { - err = -EINVAL; - goto restore_opts; - } - - if (test_opt(sb, ABORT)) - ext3_abort(sb, __func__, "Abort forced by user"); - - sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | - (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); - - es = sbi->s_es; - - ext3_init_journal_params(sb, sbi->s_journal); - - if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || - n_blocks_count > le32_to_cpu(es->s_blocks_count)) { - if (test_opt(sb, ABORT)) { - err = -EROFS; - goto restore_opts; - } - - if (*flags & MS_RDONLY) { - err = dquot_suspend(sb, -1); - if (err < 0) - goto restore_opts; - - /* - * First of all, the unconditional stuff we have to do - * to disable replay of the journal when we next remount - */ - sb->s_flags |= MS_RDONLY; - - /* - * OK, test if we are remounting a valid rw partition - * readonly, and if so set the rdonly flag and then - * mark the partition as valid again. - */ - if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) && - (sbi->s_mount_state & EXT3_VALID_FS)) - es->s_state = cpu_to_le16(sbi->s_mount_state); - - ext3_mark_recovery_complete(sb, es); - } else { - __le32 ret; - if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb, - ~EXT3_FEATURE_RO_COMPAT_SUPP))) { - ext3_msg(sb, KERN_WARNING, - "warning: couldn't remount RDWR " - "because of unsupported optional " - "features (%x)", le32_to_cpu(ret)); - err = -EROFS; - goto restore_opts; - } - - /* - * If we have an unprocessed orphan list hanging - * around from a previously readonly bdev mount, - * require a full umount & mount for now. - */ - if (es->s_last_orphan) { - ext3_msg(sb, KERN_WARNING, "warning: couldn't " - "remount RDWR because of unprocessed " - "orphan inode list. Please " - "umount & mount instead."); - err = -EINVAL; - goto restore_opts; - } - - /* - * Mounting a RDONLY partition read-write, so reread - * and store the current valid flag. (It may have - * been changed by e2fsck since we originally mounted - * the partition.) - */ - ext3_clear_journal_err(sb, es); - sbi->s_mount_state = le16_to_cpu(es->s_state); - if ((err = ext3_group_extend(sb, es, n_blocks_count))) - goto restore_opts; - if (!ext3_setup_super (sb, es, 0)) - sb->s_flags &= ~MS_RDONLY; - enable_quota = 1; - } - } -#ifdef CONFIG_QUOTA - /* Release old quota file names */ - for (i = 0; i < EXT3_MAXQUOTAS; i++) - kfree(old_opts.s_qf_names[i]); -#endif - if (enable_quota) - dquot_resume(sb, -1); - return 0; -restore_opts: - sb->s_flags = old_sb_flags; - sbi->s_mount_opt = old_opts.s_mount_opt; - sbi->s_resuid = old_opts.s_resuid; - sbi->s_resgid = old_opts.s_resgid; - sbi->s_commit_interval = old_opts.s_commit_interval; -#ifdef CONFIG_QUOTA - sbi->s_jquota_fmt = old_opts.s_jquota_fmt; - for (i = 0; i < EXT3_MAXQUOTAS; i++) { - kfree(sbi->s_qf_names[i]); - sbi->s_qf_names[i] = old_opts.s_qf_names[i]; - } -#endif - return err; -} - -static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf) -{ - struct super_block *sb = dentry->d_sb; - struct ext3_sb_info *sbi = EXT3_SB(sb); - struct ext3_super_block *es = sbi->s_es; - u64 fsid; - - 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 ngroups = sbi->s_groups_count, i; - ext3_fsblk_t 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 < ngroups; i++) { - overhead += ext3_bg_has_super(sb, i) + - ext3_bg_num_gdb(sb, i); - cond_resched(); - } - - /* - * Every block group has an inode bitmap, a block - * bitmap, and an inode table. - */ - overhead += ngroups * (2 + sbi->s_itb_per_group); - - /* Add the internal journal blocks as well */ - if (sbi->s_journal && !sbi->journal_bdev) - overhead += sbi->s_journal->j_maxlen; - - sbi->s_overhead_last = overhead; - smp_wmb(); - sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); - } - - buf->f_type = EXT3_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 = percpu_counter_sum_positive(&sbi->s_freeblocks_counter); - 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 = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); - buf->f_namelen = EXT3_NAME_LEN; - fsid = le64_to_cpup((void *)es->s_uuid) ^ - le64_to_cpup((void *)es->s_uuid + sizeof(u64)); - buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; - buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; - return 0; -} - -/* Helper function for writing quotas on sync - we need to start transaction before quota file - * is locked for write. Otherwise the are possible deadlocks: - * Process 1 Process 2 - * ext3_create() quota_sync() - * journal_start() write_dquot() - * dquot_initialize() down(dqio_mutex) - * down(dqio_mutex) journal_start() - * - */ - -#ifdef CONFIG_QUOTA - -static inline struct inode *dquot_to_inode(struct dquot *dquot) -{ - return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type]; -} - -static int ext3_write_dquot(struct dquot *dquot) -{ - int ret, err; - handle_t *handle; - struct inode *inode; - - inode = dquot_to_inode(dquot); - handle = ext3_journal_start(inode, - EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); - if (IS_ERR(handle)) - return PTR_ERR(handle); - ret = dquot_commit(dquot); - err = ext3_journal_stop(handle); - if (!ret) - ret = err; - return ret; -} - -static int ext3_acquire_dquot(struct dquot *dquot) -{ - int ret, err; - handle_t *handle; - - handle = ext3_journal_start(dquot_to_inode(dquot), - EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb)); - if (IS_ERR(handle)) - return PTR_ERR(handle); - ret = dquot_acquire(dquot); - err = ext3_journal_stop(handle); - if (!ret) - ret = err; - return ret; -} - -static int ext3_release_dquot(struct dquot *dquot) -{ - int ret, err; - handle_t *handle; - - handle = ext3_journal_start(dquot_to_inode(dquot), - EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb)); - if (IS_ERR(handle)) { - /* Release dquot anyway to avoid endless cycle in dqput() */ - dquot_release(dquot); - return PTR_ERR(handle); - } - ret = dquot_release(dquot); - err = ext3_journal_stop(handle); - if (!ret) - ret = err; - return ret; -} - -static int ext3_mark_dquot_dirty(struct dquot *dquot) -{ - /* Are we journaling quotas? */ - if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || - EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { - dquot_mark_dquot_dirty(dquot); - return ext3_write_dquot(dquot); - } else { - return dquot_mark_dquot_dirty(dquot); - } -} - -static int ext3_write_info(struct super_block *sb, int type) -{ - int ret, err; - handle_t *handle; - - /* Data block + inode block */ - handle = ext3_journal_start(d_inode(sb->s_root), 2); - if (IS_ERR(handle)) - return PTR_ERR(handle); - ret = dquot_commit_info(sb, type); - err = ext3_journal_stop(handle); - if (!ret) - ret = err; - return ret; -} - -/* - * Turn on quotas during mount time - we need to find - * the quota file and such... - */ -static int ext3_quota_on_mount(struct super_block *sb, int type) -{ - return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type], - EXT3_SB(sb)->s_jquota_fmt, type); -} - -/* - * Standard function to be called on quota_on - */ -static int ext3_quota_on(struct super_block *sb, int type, int format_id, - struct path *path) -{ - int err; - - if (!test_opt(sb, QUOTA)) - return -EINVAL; - - /* Quotafile not on the same filesystem? */ - if (path->dentry->d_sb != sb) - return -EXDEV; - /* Journaling quota? */ - if (EXT3_SB(sb)->s_qf_names[type]) { - /* Quotafile not of fs root? */ - if (path->dentry->d_parent != sb->s_root) - ext3_msg(sb, KERN_WARNING, - "warning: Quota file not on filesystem root. " - "Journaled quota will not work."); - } - - /* - * When we journal data on quota file, we have to flush journal to see - * all updates to the file when we bypass pagecache... - */ - if (ext3_should_journal_data(d_inode(path->dentry))) { - /* - * We don't need to lock updates but journal_flush() could - * otherwise be livelocked... - */ - journal_lock_updates(EXT3_SB(sb)->s_journal); - err = journal_flush(EXT3_SB(sb)->s_journal); - journal_unlock_updates(EXT3_SB(sb)->s_journal); - if (err) - return err; - } - - return dquot_quota_on(sb, type, format_id, path); -} - -/* 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 ext3_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 >> EXT3_BLOCK_SIZE_BITS(sb); - int err = 0; - int offset = off & (sb->s_blocksize - 1); - int tocopy; - size_t toread; - struct buffer_head *bh; - loff_t i_size = i_size_read(inode); - - if (off > i_size) - return 0; - if (off+len > i_size) - len = i_size-off; - toread = len; - while (toread > 0) { - tocopy = sb->s_blocksize - offset < toread ? - sb->s_blocksize - offset : toread; - bh = ext3_bread(NULL, inode, blk, 0, &err); - if (err) - return err; - if (!bh) /* A hole? */ - memset(data, 0, tocopy); - else - memcpy(data, bh->b_data+offset, tocopy); - brelse(bh); - offset = 0; - toread -= tocopy; - data += tocopy; - blk++; - } - return len; -} - -/* Write to quotafile (we know the transaction is already started and has - * enough credits) */ -static ssize_t ext3_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 >> EXT3_BLOCK_SIZE_BITS(sb); - int err = 0; - int offset = off & (sb->s_blocksize - 1); - int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL; - struct buffer_head *bh; - handle_t *handle = journal_current_handle(); - - if (!handle) { - ext3_msg(sb, KERN_WARNING, - "warning: quota write (off=%llu, len=%llu)" - " cancelled because transaction is not started.", - (unsigned long long)off, (unsigned long long)len); - return -EIO; - } - - /* - * Since we account only one data block in transaction credits, - * then it is impossible to cross a block boundary. - */ - if (sb->s_blocksize - offset < len) { - ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" - " cancelled because not block aligned", - (unsigned long long)off, (unsigned long long)len); - return -EIO; - } - bh = ext3_bread(handle, inode, blk, 1, &err); - if (!bh) - goto out; - if (journal_quota) { - err = ext3_journal_get_write_access(handle, bh); - if (err) { - brelse(bh); - goto out; - } - } - lock_buffer(bh); - memcpy(bh->b_data+offset, data, len); - flush_dcache_page(bh->b_page); - unlock_buffer(bh); - if (journal_quota) - err = ext3_journal_dirty_metadata(handle, bh); - else { - /* Always do at least ordered writes for quotas */ - err = ext3_journal_dirty_data(handle, bh); - mark_buffer_dirty(bh); - } - brelse(bh); -out: - if (err) - return err; - if (inode->i_size < off + len) { - i_size_write(inode, off + len); - EXT3_I(inode)->i_disksize = inode->i_size; - } - inode->i_version++; - inode->i_mtime = inode->i_ctime = CURRENT_TIME; - ext3_mark_inode_dirty(handle, inode); - return len; -} - -#endif - -static struct dentry *ext3_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data) -{ - return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super); -} - -static struct file_system_type ext3_fs_type = { - .owner = THIS_MODULE, - .name = "ext3", - .mount = ext3_mount, - .kill_sb = kill_block_super, - .fs_flags = FS_REQUIRES_DEV, -}; -MODULE_ALIAS_FS("ext3"); - -static int __init init_ext3_fs(void) -{ - int err = init_ext3_xattr(); - if (err) - return err; - err = init_inodecache(); - if (err) - goto out1; - err = register_filesystem(&ext3_fs_type); - if (err) - goto out; - return 0; -out: - destroy_inodecache(); -out1: - exit_ext3_xattr(); - return err; -} - -static void __exit exit_ext3_fs(void) -{ - unregister_filesystem(&ext3_fs_type); - destroy_inodecache(); - exit_ext3_xattr(); -} - -MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); -MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions"); -MODULE_LICENSE("GPL"); -module_init(init_ext3_fs) -module_exit(exit_ext3_fs) |