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fs/super.c
24.3 KB
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/* * linux/fs/super.c * * Copyright (C) 1991, 1992 Linus Torvalds * * super.c contains code to handle: - mount structures * - super-block tables * - filesystem drivers list * - mount system call * - umount system call * - ustat system call * * GK 2/5/95 - Changed to support mounting the root fs via NFS * * Added kerneld support: Jacques Gelinas and Bjorn Ekwall * Added change_root: Werner Almesberger & Hans Lermen, Feb '96 * Added options to /proc/mounts: |
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* Torbjörn Lindh (torbjorn.lindh@gopta.se), April 14, 1996. |
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* Added devfs support: Richard Gooch <rgooch@atnf.csiro.au>, 13-JAN-1998 * Heavily rewritten for 'one fs - one tree' dcache architecture. AV, Mar 2000 */ |
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#include <linux/module.h> #include <linux/slab.h> |
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#include <linux/acct.h> #include <linux/blkdev.h> |
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#include <linux/mount.h> #include <linux/security.h> |
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#include <linux/writeback.h> /* for the emergency remount stuff */ #include <linux/idr.h> |
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#include <linux/mutex.h> |
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#include <linux/backing-dev.h> |
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#include <linux/rculist_bl.h> |
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#include "internal.h" |
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|
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LIST_HEAD(super_blocks); DEFINE_SPINLOCK(sb_lock); /** * alloc_super - create new superblock |
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* @type: filesystem type superblock should belong to |
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* * Allocates and initializes a new &struct super_block. alloc_super() * returns a pointer new superblock or %NULL if allocation had failed. */ |
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static struct super_block *alloc_super(struct file_system_type *type) |
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{ |
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struct super_block *s = kzalloc(sizeof(struct super_block), GFP_USER); |
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static const struct super_operations default_op; |
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if (s) { |
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if (security_sb_alloc(s)) { kfree(s); s = NULL; goto out; } |
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#ifdef CONFIG_SMP s->s_files = alloc_percpu(struct list_head); if (!s->s_files) { security_sb_free(s); kfree(s); s = NULL; goto out; } else { int i; for_each_possible_cpu(i) INIT_LIST_HEAD(per_cpu_ptr(s->s_files, i)); } #else |
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INIT_LIST_HEAD(&s->s_files); |
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#endif |
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s->s_bdi = &default_backing_dev_info; |
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INIT_LIST_HEAD(&s->s_instances); |
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INIT_HLIST_BL_HEAD(&s->s_anon); |
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INIT_LIST_HEAD(&s->s_inodes); |
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INIT_LIST_HEAD(&s->s_dentry_lru); |
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init_rwsem(&s->s_umount); |
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mutex_init(&s->s_lock); |
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lockdep_set_class(&s->s_umount, &type->s_umount_key); |
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/* * The locking rules for s_lock are up to the * filesystem. For example ext3fs has different * lock ordering than usbfs: */ lockdep_set_class(&s->s_lock, &type->s_lock_key); |
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/* * sget() can have s_umount recursion. * * When it cannot find a suitable sb, it allocates a new * one (this one), and tries again to find a suitable old * one. * * In case that succeeds, it will acquire the s_umount * lock of the old one. Since these are clearly distrinct * locks, and this object isn't exposed yet, there's no * risk of deadlocks. * * Annotate this by putting this lock in a different * subclass. */ down_write_nested(&s->s_umount, SINGLE_DEPTH_NESTING); |
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s->s_count = 1; |
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atomic_set(&s->s_active, 1); |
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mutex_init(&s->s_vfs_rename_mutex); |
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lockdep_set_class(&s->s_vfs_rename_mutex, &type->s_vfs_rename_key); |
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mutex_init(&s->s_dquot.dqio_mutex); mutex_init(&s->s_dquot.dqonoff_mutex); |
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init_rwsem(&s->s_dquot.dqptr_sem); init_waitqueue_head(&s->s_wait_unfrozen); s->s_maxbytes = MAX_NON_LFS; |
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s->s_op = &default_op; s->s_time_gran = 1000000000; } out: return s; } /** * destroy_super - frees a superblock * @s: superblock to free * * Frees a superblock. */ static inline void destroy_super(struct super_block *s) { |
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#ifdef CONFIG_SMP free_percpu(s->s_files); #endif |
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security_sb_free(s); |
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kfree(s->s_subtype); |
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kfree(s->s_options); |
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kfree(s); } /* Superblock refcounting */ /* |
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* Drop a superblock's refcount. The caller must hold sb_lock. |
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*/ |
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void __put_super(struct super_block *sb) |
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{ |
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if (!--sb->s_count) { |
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list_del_init(&sb->s_list); |
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destroy_super(sb); |
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} |
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} /** * put_super - drop a temporary reference to superblock * @sb: superblock in question * * Drops a temporary reference, frees superblock if there's no * references left. */ |
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void put_super(struct super_block *sb) |
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{ spin_lock(&sb_lock); __put_super(sb); spin_unlock(&sb_lock); } /** |
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* deactivate_locked_super - drop an active reference to superblock |
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* @s: superblock to deactivate * |
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* Drops an active reference to superblock, converting it into a temprory * one if there is no other active references left. In that case we |
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* tell fs driver to shut it down and drop the temporary reference we * had just acquired. |
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* * Caller holds exclusive lock on superblock; that lock is released. |
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*/ |
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void deactivate_locked_super(struct super_block *s) |
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{ struct file_system_type *fs = s->s_type; |
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if (atomic_dec_and_test(&s->s_active)) { |
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fs->kill_sb(s); |
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/* * We need to call rcu_barrier so all the delayed rcu free * inodes are flushed before we release the fs module. */ rcu_barrier(); |
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put_filesystem(fs); put_super(s); |
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} else { up_write(&s->s_umount); |
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} } |
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EXPORT_SYMBOL(deactivate_locked_super); |
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/** |
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* deactivate_super - drop an active reference to superblock |
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* @s: superblock to deactivate * |
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* Variant of deactivate_locked_super(), except that superblock is *not* * locked by caller. If we are going to drop the final active reference, * lock will be acquired prior to that. |
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*/ |
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void deactivate_super(struct super_block *s) |
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{ |
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if (!atomic_add_unless(&s->s_active, -1, 1)) { down_write(&s->s_umount); deactivate_locked_super(s); |
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} } |
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EXPORT_SYMBOL(deactivate_super); |
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/** |
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* grab_super - acquire an active reference * @s: reference we are trying to make active * * Tries to acquire an active reference. grab_super() is used when we * had just found a superblock in super_blocks or fs_type->fs_supers * and want to turn it into a full-blown active reference. grab_super() * is called with sb_lock held and drops it. Returns 1 in case of * success, 0 if we had failed (superblock contents was already dead or * dying when grab_super() had been called). */ |
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static int grab_super(struct super_block *s) __releases(sb_lock) |
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{ |
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if (atomic_inc_not_zero(&s->s_active)) { spin_unlock(&sb_lock); |
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return 1; } /* it's going away */ |
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s->s_count++; spin_unlock(&sb_lock); |
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/* wait for it to die */ |
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down_write(&s->s_umount); |
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up_write(&s->s_umount); put_super(s); |
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return 0; } |
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/* |
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* Superblock locking. We really ought to get rid of these two. */ void lock_super(struct super_block * sb) { get_fs_excl(); mutex_lock(&sb->s_lock); } void unlock_super(struct super_block * sb) { put_fs_excl(); mutex_unlock(&sb->s_lock); } EXPORT_SYMBOL(lock_super); EXPORT_SYMBOL(unlock_super); |
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/** * generic_shutdown_super - common helper for ->kill_sb() * @sb: superblock to kill * * generic_shutdown_super() does all fs-independent work on superblock * shutdown. Typical ->kill_sb() should pick all fs-specific objects * that need destruction out of superblock, call generic_shutdown_super() * and release aforementioned objects. Note: dentries and inodes _are_ * taken care of and do not need specific handling. |
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* * Upon calling this function, the filesystem may no longer alter or * rearrange the set of dentries belonging to this super_block, nor may it * change the attachments of dentries to inodes. |
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*/ void generic_shutdown_super(struct super_block *sb) { |
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const struct super_operations *sop = sb->s_op; |
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|
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|
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if (sb->s_root) { shrink_dcache_for_umount(sb); |
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sync_filesystem(sb); |
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get_fs_excl(); |
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sb->s_flags &= ~MS_ACTIVE; |
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|
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fsnotify_unmount_inodes(&sb->s_inodes); evict_inodes(sb); |
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|
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if (sop->put_super) sop->put_super(sb); |
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if (!list_empty(&sb->s_inodes)) { |
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printk("VFS: Busy inodes after unmount of %s. " "Self-destruct in 5 seconds. Have a nice day... ", sb->s_id); |
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} |
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put_fs_excl(); |
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} spin_lock(&sb_lock); /* should be initialized for __put_super_and_need_restart() */ |
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list_del_init(&sb->s_instances); |
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spin_unlock(&sb_lock); up_write(&sb->s_umount); } EXPORT_SYMBOL(generic_shutdown_super); /** * sget - find or create a superblock * @type: filesystem type superblock should belong to * @test: comparison callback * @set: setup callback * @data: argument to each of them */ struct super_block *sget(struct file_system_type *type, int (*test)(struct super_block *,void *), int (*set)(struct super_block *,void *), void *data) { struct super_block *s = NULL; |
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struct super_block *old; |
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int err; retry: spin_lock(&sb_lock); |
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if (test) { list_for_each_entry(old, &type->fs_supers, s_instances) { if (!test(old, data)) continue; if (!grab_super(old)) goto retry; |
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if (s) { up_write(&s->s_umount); |
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destroy_super(s); |
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s = NULL; |
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} |
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down_write(&old->s_umount); |
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if (unlikely(!(old->s_flags & MS_BORN))) { deactivate_locked_super(old); goto retry; } |
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return old; } |
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} if (!s) { spin_unlock(&sb_lock); |
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s = alloc_super(type); |
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if (!s) return ERR_PTR(-ENOMEM); goto retry; } err = set(s, data); if (err) { spin_unlock(&sb_lock); |
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up_write(&s->s_umount); |
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destroy_super(s); return ERR_PTR(err); } s->s_type = type; strlcpy(s->s_id, type->name, sizeof(s->s_id)); list_add_tail(&s->s_list, &super_blocks); list_add(&s->s_instances, &type->fs_supers); spin_unlock(&sb_lock); get_filesystem(type); return s; } EXPORT_SYMBOL(sget); void drop_super(struct super_block *sb) { up_read(&sb->s_umount); put_super(sb); } EXPORT_SYMBOL(drop_super); |
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/** * sync_supers - helper for periodic superblock writeback * * Call the write_super method if present on all dirty superblocks in * the system. This is for the periodic writeback used by most older * filesystems. For data integrity superblock writeback use * sync_filesystems() instead. * |
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* Note: check the dirty flag before waiting, so we don't * hold up the sync while mounting a device. (The newly * mounted device won't need syncing.) */ void sync_supers(void) { |
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struct super_block *sb, *p = NULL; |
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|
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spin_lock(&sb_lock); |
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list_for_each_entry(sb, &super_blocks, s_list) { |
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if (list_empty(&sb->s_instances)) continue; |
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if (sb->s_op->write_super && sb->s_dirt) { |
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sb->s_count++; spin_unlock(&sb_lock); |
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|
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down_read(&sb->s_umount); |
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if (sb->s_root && sb->s_dirt) sb->s_op->write_super(sb); |
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up_read(&sb->s_umount); |
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|
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spin_lock(&sb_lock); |
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if (p) __put_super(p); p = sb; |
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} } |
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if (p) __put_super(p); |
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spin_unlock(&sb_lock); } |
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/** |
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* iterate_supers - call function for all active superblocks * @f: function to call * @arg: argument to pass to it * * Scans the superblock list and calls given function, passing it * locked superblock and given argument. */ void iterate_supers(void (*f)(struct super_block *, void *), void *arg) { |
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struct super_block *sb, *p = NULL; |
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spin_lock(&sb_lock); |
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list_for_each_entry(sb, &super_blocks, s_list) { |
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if (list_empty(&sb->s_instances)) continue; sb->s_count++; spin_unlock(&sb_lock); down_read(&sb->s_umount); if (sb->s_root) f(sb, arg); up_read(&sb->s_umount); spin_lock(&sb_lock); |
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if (p) __put_super(p); p = sb; |
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} |
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if (p) __put_super(p); |
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spin_unlock(&sb_lock); } /** |
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* get_super - get the superblock of a device * @bdev: device to get the superblock for * * Scans the superblock list and finds the superblock of the file system * mounted on the device given. %NULL is returned if no match is found. */ |
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struct super_block *get_super(struct block_device *bdev) |
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{ |
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struct super_block *sb; |
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if (!bdev) return NULL; |
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|
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spin_lock(&sb_lock); |
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rescan: list_for_each_entry(sb, &super_blocks, s_list) { |
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if (list_empty(&sb->s_instances)) continue; |
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if (sb->s_bdev == bdev) { sb->s_count++; |
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spin_unlock(&sb_lock); |
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down_read(&sb->s_umount); |
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/* still alive? */ |
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if (sb->s_root) return sb; up_read(&sb->s_umount); |
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/* nope, got unmounted */ |
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spin_lock(&sb_lock); |
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__put_super(sb); goto rescan; |
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473 474 475 476 477 478 479 |
} } spin_unlock(&sb_lock); return NULL; } EXPORT_SYMBOL(get_super); |
4504230a7 freeze_bdev: grab... |
480 481 482 483 484 485 486 |
/** * get_active_super - get an active reference to the superblock of a device * @bdev: device to get the superblock for * * Scans the superblock list and finds the superblock of the file system * mounted on the device given. Returns the superblock with an active |
d3f214730 Move grabbing s_u... |
487 |
* reference or %NULL if none was found. |
4504230a7 freeze_bdev: grab... |
488 489 490 491 492 493 494 |
*/ struct super_block *get_active_super(struct block_device *bdev) { struct super_block *sb; if (!bdev) return NULL; |
1494583de fix get_active_su... |
495 |
restart: |
4504230a7 freeze_bdev: grab... |
496 497 |
spin_lock(&sb_lock); list_for_each_entry(sb, &super_blocks, s_list) { |
551de6f34 Leave superblocks... |
498 499 |
if (list_empty(&sb->s_instances)) continue; |
1494583de fix get_active_su... |
500 501 502 503 504 505 |
if (sb->s_bdev == bdev) { if (grab_super(sb)) /* drops sb_lock */ return sb; else goto restart; } |
4504230a7 freeze_bdev: grab... |
506 507 508 509 |
} spin_unlock(&sb_lock); return NULL; } |
1da177e4c Linux-2.6.12-rc2 |
510 |
|
df40c01a9 In get_super() an... |
511 |
struct super_block *user_get_super(dev_t dev) |
1da177e4c Linux-2.6.12-rc2 |
512 |
{ |
618f06362 [PATCH] O(1) sb l... |
513 |
struct super_block *sb; |
1da177e4c Linux-2.6.12-rc2 |
514 |
|
1da177e4c Linux-2.6.12-rc2 |
515 |
spin_lock(&sb_lock); |
618f06362 [PATCH] O(1) sb l... |
516 517 |
rescan: list_for_each_entry(sb, &super_blocks, s_list) { |
551de6f34 Leave superblocks... |
518 519 |
if (list_empty(&sb->s_instances)) continue; |
618f06362 [PATCH] O(1) sb l... |
520 521 |
if (sb->s_dev == dev) { sb->s_count++; |
1da177e4c Linux-2.6.12-rc2 |
522 |
spin_unlock(&sb_lock); |
618f06362 [PATCH] O(1) sb l... |
523 |
down_read(&sb->s_umount); |
df40c01a9 In get_super() an... |
524 |
/* still alive? */ |
618f06362 [PATCH] O(1) sb l... |
525 526 527 |
if (sb->s_root) return sb; up_read(&sb->s_umount); |
df40c01a9 In get_super() an... |
528 |
/* nope, got unmounted */ |
618f06362 [PATCH] O(1) sb l... |
529 |
spin_lock(&sb_lock); |
df40c01a9 In get_super() an... |
530 531 |
__put_super(sb); goto rescan; |
1da177e4c Linux-2.6.12-rc2 |
532 533 534 535 536 |
} } spin_unlock(&sb_lock); return NULL; } |
1da177e4c Linux-2.6.12-rc2 |
537 |
/** |
1da177e4c Linux-2.6.12-rc2 |
538 539 540 541 542 543 544 545 546 547 548 |
* do_remount_sb - asks filesystem to change mount options. * @sb: superblock in question * @flags: numeric part of options * @data: the rest of options * @force: whether or not to force the change * * Alters the mount options of a mounted file system. */ int do_remount_sb(struct super_block *sb, int flags, void *data, int force) { int retval; |
c79d967de quota: move remou... |
549 |
int remount_ro; |
4504230a7 freeze_bdev: grab... |
550 551 552 |
if (sb->s_frozen != SB_UNFROZEN) return -EBUSY; |
9361401eb [PATCH] BLOCK: Ma... |
553 |
#ifdef CONFIG_BLOCK |
1da177e4c Linux-2.6.12-rc2 |
554 555 |
if (!(flags & MS_RDONLY) && bdev_read_only(sb->s_bdev)) return -EACCES; |
9361401eb [PATCH] BLOCK: Ma... |
556 |
#endif |
4504230a7 freeze_bdev: grab... |
557 |
|
1da177e4c Linux-2.6.12-rc2 |
558 559 560 |
if (flags & MS_RDONLY) acct_auto_close(sb); shrink_dcache_sb(sb); |
60b0680fa vfs: Rename fsync... |
561 |
sync_filesystem(sb); |
1da177e4c Linux-2.6.12-rc2 |
562 |
|
d208bbdda fs: improve remou... |
563 |
remount_ro = (flags & MS_RDONLY) && !(sb->s_flags & MS_RDONLY); |
d208bbdda fs: improve remou... |
564 |
|
1da177e4c Linux-2.6.12-rc2 |
565 566 |
/* If we are remounting RDONLY and current sb is read/write, make sure there are no rw files opened */ |
d208bbdda fs: improve remou... |
567 |
if (remount_ro) { |
1da177e4c Linux-2.6.12-rc2 |
568 569 |
if (force) mark_files_ro(sb); |
b0895513f remove unlock_ker... |
570 |
else if (!fs_may_remount_ro(sb)) |
1da177e4c Linux-2.6.12-rc2 |
571 572 573 574 |
return -EBUSY; } if (sb->s_op->remount_fs) { |
1da177e4c Linux-2.6.12-rc2 |
575 |
retval = sb->s_op->remount_fs(sb, &flags, data); |
b0895513f remove unlock_ker... |
576 |
if (retval) |
1da177e4c Linux-2.6.12-rc2 |
577 578 579 |
return retval; } sb->s_flags = (sb->s_flags & ~MS_RMT_MASK) | (flags & MS_RMT_MASK); |
c79d967de quota: move remou... |
580 |
|
d208bbdda fs: improve remou... |
581 582 583 584 585 586 587 588 589 590 |
/* * Some filesystems modify their metadata via some other path than the * bdev buffer cache (eg. use a private mapping, or directories in * pagecache, etc). Also file data modifications go via their own * mappings. So If we try to mount readonly then copy the filesystem * from bdev, we could get stale data, so invalidate it to give a best * effort at coherency. */ if (remount_ro && sb->s_bdev) invalidate_bdev(sb->s_bdev); |
1da177e4c Linux-2.6.12-rc2 |
591 592 |
return 0; } |
a2a9537ac Get rid of pdflus... |
593 |
static void do_emergency_remount(struct work_struct *work) |
1da177e4c Linux-2.6.12-rc2 |
594 |
{ |
dca332528 no need for list_... |
595 |
struct super_block *sb, *p = NULL; |
1da177e4c Linux-2.6.12-rc2 |
596 597 |
spin_lock(&sb_lock); |
dca332528 no need for list_... |
598 |
list_for_each_entry(sb, &super_blocks, s_list) { |
551de6f34 Leave superblocks... |
599 600 |
if (list_empty(&sb->s_instances)) continue; |
1da177e4c Linux-2.6.12-rc2 |
601 602 |
sb->s_count++; spin_unlock(&sb_lock); |
443b94baa Make sure that al... |
603 |
down_write(&sb->s_umount); |
1da177e4c Linux-2.6.12-rc2 |
604 605 |
if (sb->s_root && sb->s_bdev && !(sb->s_flags & MS_RDONLY)) { /* |
1da177e4c Linux-2.6.12-rc2 |
606 607 |
* What lock protects sb->s_flags?? */ |
1da177e4c Linux-2.6.12-rc2 |
608 |
do_remount_sb(sb, MS_RDONLY, NULL, 1); |
1da177e4c Linux-2.6.12-rc2 |
609 |
} |
443b94baa Make sure that al... |
610 |
up_write(&sb->s_umount); |
1da177e4c Linux-2.6.12-rc2 |
611 |
spin_lock(&sb_lock); |
dca332528 no need for list_... |
612 613 614 |
if (p) __put_super(p); p = sb; |
1da177e4c Linux-2.6.12-rc2 |
615 |
} |
dca332528 no need for list_... |
616 617 |
if (p) __put_super(p); |
1da177e4c Linux-2.6.12-rc2 |
618 |
spin_unlock(&sb_lock); |
a2a9537ac Get rid of pdflus... |
619 |
kfree(work); |
1da177e4c Linux-2.6.12-rc2 |
620 621 622 623 624 625 |
printk("Emergency Remount complete "); } void emergency_remount(void) { |
a2a9537ac Get rid of pdflus... |
626 627 628 629 630 631 632 |
struct work_struct *work; work = kmalloc(sizeof(*work), GFP_ATOMIC); if (work) { INIT_WORK(work, do_emergency_remount); schedule_work(work); } |
1da177e4c Linux-2.6.12-rc2 |
633 634 635 636 637 638 |
} /* * Unnamed block devices are dummy devices used by virtual * filesystems which don't use real block-devices. -- jrs */ |
ad76cbc63 [PATCH 2/2] anond... |
639 |
static DEFINE_IDA(unnamed_dev_ida); |
1da177e4c Linux-2.6.12-rc2 |
640 |
static DEFINE_SPINLOCK(unnamed_dev_lock);/* protects the above */ |
c63e09ecc Make allocation o... |
641 |
static int unnamed_dev_start = 0; /* don't bother trying below it */ |
1da177e4c Linux-2.6.12-rc2 |
642 643 644 645 646 647 648 |
int set_anon_super(struct super_block *s, void *data) { int dev; int error; retry: |
ad76cbc63 [PATCH 2/2] anond... |
649 |
if (ida_pre_get(&unnamed_dev_ida, GFP_ATOMIC) == 0) |
1da177e4c Linux-2.6.12-rc2 |
650 651 |
return -ENOMEM; spin_lock(&unnamed_dev_lock); |
c63e09ecc Make allocation o... |
652 |
error = ida_get_new_above(&unnamed_dev_ida, unnamed_dev_start, &dev); |
f21f62208 ... and the same ... |
653 654 |
if (!error) unnamed_dev_start = dev + 1; |
1da177e4c Linux-2.6.12-rc2 |
655 656 657 658 659 660 661 662 663 |
spin_unlock(&unnamed_dev_lock); if (error == -EAGAIN) /* We raced and lost with another CPU. */ goto retry; else if (error) return -EAGAIN; if ((dev & MAX_ID_MASK) == (1 << MINORBITS)) { spin_lock(&unnamed_dev_lock); |
ad76cbc63 [PATCH 2/2] anond... |
664 |
ida_remove(&unnamed_dev_ida, dev); |
f21f62208 ... and the same ... |
665 666 |
if (unnamed_dev_start > dev) unnamed_dev_start = dev; |
1da177e4c Linux-2.6.12-rc2 |
667 668 669 670 |
spin_unlock(&unnamed_dev_lock); return -EMFILE; } s->s_dev = MKDEV(0, dev & MINORMASK); |
5129a469a Catch filesystems... |
671 |
s->s_bdi = &noop_backing_dev_info; |
1da177e4c Linux-2.6.12-rc2 |
672 673 674 675 676 677 678 679 680 681 682 |
return 0; } EXPORT_SYMBOL(set_anon_super); void kill_anon_super(struct super_block *sb) { int slot = MINOR(sb->s_dev); generic_shutdown_super(sb); spin_lock(&unnamed_dev_lock); |
ad76cbc63 [PATCH 2/2] anond... |
683 |
ida_remove(&unnamed_dev_ida, slot); |
c63e09ecc Make allocation o... |
684 685 |
if (slot < unnamed_dev_start) unnamed_dev_start = slot; |
1da177e4c Linux-2.6.12-rc2 |
686 687 688 689 |
spin_unlock(&unnamed_dev_lock); } EXPORT_SYMBOL(kill_anon_super); |
1da177e4c Linux-2.6.12-rc2 |
690 691 692 693 694 695 696 697 |
void kill_litter_super(struct super_block *sb) { if (sb->s_root) d_genocide(sb->s_root); kill_anon_super(sb); } EXPORT_SYMBOL(kill_litter_super); |
909e6d947 namespaces: move ... |
698 699 700 701 702 703 704 705 706 707 |
static int ns_test_super(struct super_block *sb, void *data) { return sb->s_fs_info == data; } static int ns_set_super(struct super_block *sb, void *data) { sb->s_fs_info = data; return set_anon_super(sb, NULL); } |
ceefda693 switch get_sb_ns(... |
708 709 |
struct dentry *mount_ns(struct file_system_type *fs_type, int flags, void *data, int (*fill_super)(struct super_block *, void *, int)) |
909e6d947 namespaces: move ... |
710 711 712 713 714 |
{ struct super_block *sb; sb = sget(fs_type, ns_test_super, ns_set_super, data); if (IS_ERR(sb)) |
ceefda693 switch get_sb_ns(... |
715 |
return ERR_CAST(sb); |
909e6d947 namespaces: move ... |
716 717 718 719 720 721 |
if (!sb->s_root) { int err; sb->s_flags = flags; err = fill_super(sb, data, flags & MS_SILENT ? 1 : 0); if (err) { |
74dbbdd7f New helper: deact... |
722 |
deactivate_locked_super(sb); |
ceefda693 switch get_sb_ns(... |
723 |
return ERR_PTR(err); |
909e6d947 namespaces: move ... |
724 725 726 727 |
} sb->s_flags |= MS_ACTIVE; } |
ceefda693 switch get_sb_ns(... |
728 |
return dget(sb->s_root); |
909e6d947 namespaces: move ... |
729 |
} |
ceefda693 switch get_sb_ns(... |
730 |
EXPORT_SYMBOL(mount_ns); |
909e6d947 namespaces: move ... |
731 |
|
9361401eb [PATCH] BLOCK: Ma... |
732 |
#ifdef CONFIG_BLOCK |
1da177e4c Linux-2.6.12-rc2 |
733 734 735 736 |
static int set_bdev_super(struct super_block *s, void *data) { s->s_bdev = data; s->s_dev = s->s_bdev->bd_dev; |
32a88aa1b fs: Assign bdi in... |
737 738 739 740 741 742 |
/* * We set the bdi here to the queue backing, file systems can * overwrite this in ->fill_super() */ s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info; |
1da177e4c Linux-2.6.12-rc2 |
743 744 745 746 747 748 749 |
return 0; } static int test_bdev_super(struct super_block *s, void *data) { return (void *)s->s_bdev == data; } |
152a08366 new helper: mount... |
750 |
struct dentry *mount_bdev(struct file_system_type *fs_type, |
1da177e4c Linux-2.6.12-rc2 |
751 |
int flags, const char *dev_name, void *data, |
152a08366 new helper: mount... |
752 |
int (*fill_super)(struct super_block *, void *, int)) |
1da177e4c Linux-2.6.12-rc2 |
753 754 755 |
{ struct block_device *bdev; struct super_block *s; |
d4d776299 block: clean up b... |
756 |
fmode_t mode = FMODE_READ | FMODE_EXCL; |
1da177e4c Linux-2.6.12-rc2 |
757 |
int error = 0; |
30c40d2c0 [PATCH] propagate... |
758 759 |
if (!(flags & MS_RDONLY)) mode |= FMODE_WRITE; |
d4d776299 block: clean up b... |
760 |
bdev = blkdev_get_by_path(dev_name, mode, fs_type); |
1da177e4c Linux-2.6.12-rc2 |
761 |
if (IS_ERR(bdev)) |
152a08366 new helper: mount... |
762 |
return ERR_CAST(bdev); |
1da177e4c Linux-2.6.12-rc2 |
763 764 765 766 767 768 |
/* * once the super is inserted into the list by sget, s_umount * will protect the lockfs code from trying to start a snapshot * while we are mounting */ |
4fadd7bb2 freeze_bdev: kill... |
769 770 771 772 773 774 |
mutex_lock(&bdev->bd_fsfreeze_mutex); if (bdev->bd_fsfreeze_count > 0) { mutex_unlock(&bdev->bd_fsfreeze_mutex); error = -EBUSY; goto error_bdev; } |
1da177e4c Linux-2.6.12-rc2 |
775 |
s = sget(fs_type, test_bdev_super, set_bdev_super, bdev); |
4fadd7bb2 freeze_bdev: kill... |
776 |
mutex_unlock(&bdev->bd_fsfreeze_mutex); |
1da177e4c Linux-2.6.12-rc2 |
777 |
if (IS_ERR(s)) |
454e2398b [PATCH] VFS: Perm... |
778 |
goto error_s; |
1da177e4c Linux-2.6.12-rc2 |
779 780 781 |
if (s->s_root) { if ((flags ^ s->s_flags) & MS_RDONLY) { |
74dbbdd7f New helper: deact... |
782 |
deactivate_locked_super(s); |
454e2398b [PATCH] VFS: Perm... |
783 784 |
error = -EBUSY; goto error_bdev; |
1da177e4c Linux-2.6.12-rc2 |
785 |
} |
454e2398b [PATCH] VFS: Perm... |
786 |
|
4f331f01b vfs: don't hold s... |
787 788 |
/* * s_umount nests inside bd_mutex during |
e525fd89d block: make blkde... |
789 790 791 792 |
* __invalidate_device(). blkdev_put() acquires * bd_mutex and can't be called under s_umount. Drop * s_umount temporarily. This is safe as we're * holding an active reference. |
4f331f01b vfs: don't hold s... |
793 794 |
*/ up_write(&s->s_umount); |
d4d776299 block: clean up b... |
795 |
blkdev_put(bdev, mode); |
4f331f01b vfs: don't hold s... |
796 |
down_write(&s->s_umount); |
1da177e4c Linux-2.6.12-rc2 |
797 798 799 800 |
} else { char b[BDEVNAME_SIZE]; s->s_flags = flags; |
30c40d2c0 [PATCH] propagate... |
801 |
s->s_mode = mode; |
1da177e4c Linux-2.6.12-rc2 |
802 |
strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); |
e78c9a004 [PATCH] fs: remov... |
803 |
sb_set_blocksize(s, block_size(bdev)); |
9b04c997b [PATCH] vfs: MS_V... |
804 |
error = fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
1da177e4c Linux-2.6.12-rc2 |
805 |
if (error) { |
74dbbdd7f New helper: deact... |
806 |
deactivate_locked_super(s); |
454e2398b [PATCH] VFS: Perm... |
807 |
goto error; |
fa675765a Revert mount/umou... |
808 |
} |
454e2398b [PATCH] VFS: Perm... |
809 810 |
s->s_flags |= MS_ACTIVE; |
87d8fe1ee add releasepage h... |
811 |
bdev->bd_super = s; |
1da177e4c Linux-2.6.12-rc2 |
812 |
} |
152a08366 new helper: mount... |
813 |
return dget(s->s_root); |
1da177e4c Linux-2.6.12-rc2 |
814 |
|
454e2398b [PATCH] VFS: Perm... |
815 816 817 |
error_s: error = PTR_ERR(s); error_bdev: |
d4d776299 block: clean up b... |
818 |
blkdev_put(bdev, mode); |
454e2398b [PATCH] VFS: Perm... |
819 |
error: |
152a08366 new helper: mount... |
820 821 822 |
return ERR_PTR(error); } EXPORT_SYMBOL(mount_bdev); |
1da177e4c Linux-2.6.12-rc2 |
823 824 825 |
void kill_block_super(struct super_block *sb) { struct block_device *bdev = sb->s_bdev; |
30c40d2c0 [PATCH] propagate... |
826 |
fmode_t mode = sb->s_mode; |
1da177e4c Linux-2.6.12-rc2 |
827 |
|
ddbaaf302 NULL noise in fs/... |
828 |
bdev->bd_super = NULL; |
1da177e4c Linux-2.6.12-rc2 |
829 830 |
generic_shutdown_super(sb); sync_blockdev(bdev); |
d4d776299 block: clean up b... |
831 |
WARN_ON_ONCE(!(mode & FMODE_EXCL)); |
e525fd89d block: make blkde... |
832 |
blkdev_put(bdev, mode | FMODE_EXCL); |
1da177e4c Linux-2.6.12-rc2 |
833 834 835 |
} EXPORT_SYMBOL(kill_block_super); |
9361401eb [PATCH] BLOCK: Ma... |
836 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
837 |
|
3c26ff6e4 convert get_sb_no... |
838 |
struct dentry *mount_nodev(struct file_system_type *fs_type, |
1da177e4c Linux-2.6.12-rc2 |
839 |
int flags, void *data, |
3c26ff6e4 convert get_sb_no... |
840 |
int (*fill_super)(struct super_block *, void *, int)) |
1da177e4c Linux-2.6.12-rc2 |
841 842 843 844 845 |
{ int error; struct super_block *s = sget(fs_type, NULL, set_anon_super, NULL); if (IS_ERR(s)) |
3c26ff6e4 convert get_sb_no... |
846 |
return ERR_CAST(s); |
1da177e4c Linux-2.6.12-rc2 |
847 848 |
s->s_flags = flags; |
9b04c997b [PATCH] vfs: MS_V... |
849 |
error = fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
1da177e4c Linux-2.6.12-rc2 |
850 |
if (error) { |
74dbbdd7f New helper: deact... |
851 |
deactivate_locked_super(s); |
3c26ff6e4 convert get_sb_no... |
852 |
return ERR_PTR(error); |
1da177e4c Linux-2.6.12-rc2 |
853 854 |
} s->s_flags |= MS_ACTIVE; |
3c26ff6e4 convert get_sb_no... |
855 |
return dget(s->s_root); |
1da177e4c Linux-2.6.12-rc2 |
856 |
} |
3c26ff6e4 convert get_sb_no... |
857 |
EXPORT_SYMBOL(mount_nodev); |
1da177e4c Linux-2.6.12-rc2 |
858 859 860 861 |
static int compare_single(struct super_block *s, void *p) { return 1; } |
fc14f2fef convert get_sb_si... |
862 |
struct dentry *mount_single(struct file_system_type *fs_type, |
1da177e4c Linux-2.6.12-rc2 |
863 |
int flags, void *data, |
fc14f2fef convert get_sb_si... |
864 |
int (*fill_super)(struct super_block *, void *, int)) |
1da177e4c Linux-2.6.12-rc2 |
865 866 867 868 869 870 |
{ struct super_block *s; int error; s = sget(fs_type, compare_single, set_anon_super, NULL); if (IS_ERR(s)) |
fc14f2fef convert get_sb_si... |
871 |
return ERR_CAST(s); |
1da177e4c Linux-2.6.12-rc2 |
872 873 |
if (!s->s_root) { s->s_flags = flags; |
9b04c997b [PATCH] vfs: MS_V... |
874 |
error = fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
1da177e4c Linux-2.6.12-rc2 |
875 |
if (error) { |
74dbbdd7f New helper: deact... |
876 |
deactivate_locked_super(s); |
fc14f2fef convert get_sb_si... |
877 |
return ERR_PTR(error); |
1da177e4c Linux-2.6.12-rc2 |
878 879 |
} s->s_flags |= MS_ACTIVE; |
9329d1bea vfs: get_sb_singl... |
880 881 |
} else { do_remount_sb(s, flags, data, 0); |
1da177e4c Linux-2.6.12-rc2 |
882 |
} |
fc14f2fef convert get_sb_si... |
883 884 885 |
return dget(s->s_root); } EXPORT_SYMBOL(mount_single); |
9d412a43c vfs: split off vf... |
886 887 |
struct dentry * mount_fs(struct file_system_type *type, int flags, const char *name, void *data) |
1da177e4c Linux-2.6.12-rc2 |
888 |
{ |
c96e41e92 beginning of tran... |
889 |
struct dentry *root; |
9d412a43c vfs: split off vf... |
890 |
struct super_block *sb; |
1da177e4c Linux-2.6.12-rc2 |
891 |
char *secdata = NULL; |
9d412a43c vfs: split off vf... |
892 |
int error = -ENOMEM; |
8089352a1 Mirror MS_KERNMOU... |
893 |
|
e00075298 LSM/SELinux: Inte... |
894 |
if (data && !(type->fs_flags & FS_BINARY_MOUNTDATA)) { |
1da177e4c Linux-2.6.12-rc2 |
895 |
secdata = alloc_secdata(); |
454e2398b [PATCH] VFS: Perm... |
896 |
if (!secdata) |
9d412a43c vfs: split off vf... |
897 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
898 |
|
e00075298 LSM/SELinux: Inte... |
899 |
error = security_sb_copy_data(data, secdata); |
454e2398b [PATCH] VFS: Perm... |
900 |
if (error) |
1da177e4c Linux-2.6.12-rc2 |
901 |
goto out_free_secdata; |
1da177e4c Linux-2.6.12-rc2 |
902 |
} |
1a102ff92 vfs: bury ->get_sb() |
903 904 905 906 |
root = type->mount(type, flags, name, data); if (IS_ERR(root)) { error = PTR_ERR(root); goto out_free_secdata; |
c96e41e92 beginning of tran... |
907 |
} |
9d412a43c vfs: split off vf... |
908 909 910 |
sb = root->d_sb; BUG_ON(!sb); WARN_ON(!sb->s_bdi); |
6c5103890 Merge branch 'for... |
911 |
WARN_ON(sb->s_bdi == &default_backing_dev_info); |
9d412a43c vfs: split off vf... |
912 |
sb->s_flags |= MS_BORN; |
454e2398b [PATCH] VFS: Perm... |
913 |
|
9d412a43c vfs: split off vf... |
914 |
error = security_sb_kern_mount(sb, flags, secdata); |
5129a469a Catch filesystems... |
915 916 |
if (error) goto out_sb; |
454e2398b [PATCH] VFS: Perm... |
917 |
|
42cb56ae2 vfs: change sb->s... |
918 919 920 921 922 923 924 |
/* * filesystems should never set s_maxbytes larger than MAX_LFS_FILESIZE * but s_maxbytes was an unsigned long long for many releases. Throw * this warning for a little while to try and catch filesystems that * violate this rule. This warning should be either removed or * converted to a BUG() in 2.6.34. */ |
9d412a43c vfs: split off vf... |
925 926 927 |
WARN((sb->s_maxbytes < 0), "%s set sb->s_maxbytes to " "negative value (%lld) ", type->name, sb->s_maxbytes); |
42cb56ae2 vfs: change sb->s... |
928 |
|
9d412a43c vfs: split off vf... |
929 |
up_write(&sb->s_umount); |
8680e22f2 [PATCH] VFS: memo... |
930 |
free_secdata(secdata); |
9d412a43c vfs: split off vf... |
931 |
return root; |
1da177e4c Linux-2.6.12-rc2 |
932 |
out_sb: |
9d412a43c vfs: split off vf... |
933 934 |
dput(root); deactivate_locked_super(sb); |
1da177e4c Linux-2.6.12-rc2 |
935 936 |
out_free_secdata: free_secdata(secdata); |
1da177e4c Linux-2.6.12-rc2 |
937 |
out: |
454e2398b [PATCH] VFS: Perm... |
938 |
return ERR_PTR(error); |
1da177e4c Linux-2.6.12-rc2 |
939 |
} |
18e9e5104 Introduce freeze_... |
940 |
/** |
7000d3c42 fs/super: fix ker... |
941 942 |
* freeze_super - lock the filesystem and force it into a consistent state * @sb: the super to lock |
18e9e5104 Introduce freeze_... |
943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 |
* * Syncs the super to make sure the filesystem is consistent and calls the fs's * freeze_fs. Subsequent calls to this without first thawing the fs will return * -EBUSY. */ int freeze_super(struct super_block *sb) { int ret; atomic_inc(&sb->s_active); down_write(&sb->s_umount); if (sb->s_frozen) { deactivate_locked_super(sb); return -EBUSY; } if (sb->s_flags & MS_RDONLY) { sb->s_frozen = SB_FREEZE_TRANS; smp_wmb(); up_write(&sb->s_umount); return 0; } sb->s_frozen = SB_FREEZE_WRITE; smp_wmb(); sync_filesystem(sb); sb->s_frozen = SB_FREEZE_TRANS; smp_wmb(); sync_blockdev(sb->s_bdev); if (sb->s_op->freeze_fs) { ret = sb->s_op->freeze_fs(sb); if (ret) { printk(KERN_ERR "VFS:Filesystem freeze failed "); sb->s_frozen = SB_UNFROZEN; deactivate_locked_super(sb); return ret; } } up_write(&sb->s_umount); return 0; } EXPORT_SYMBOL(freeze_super); /** * thaw_super -- unlock filesystem * @sb: the super to thaw * * Unlocks the filesystem and marks it writeable again after freeze_super(). */ int thaw_super(struct super_block *sb) { int error; down_write(&sb->s_umount); if (sb->s_frozen == SB_UNFROZEN) { up_write(&sb->s_umount); return -EINVAL; } if (sb->s_flags & MS_RDONLY) goto out; if (sb->s_op->unfreeze_fs) { error = sb->s_op->unfreeze_fs(sb); if (error) { printk(KERN_ERR "VFS:Filesystem thaw failed "); sb->s_frozen = SB_FREEZE_TRANS; up_write(&sb->s_umount); return error; } } out: sb->s_frozen = SB_UNFROZEN; smp_wmb(); wake_up(&sb->s_wait_unfrozen); deactivate_locked_super(sb); return 0; } EXPORT_SYMBOL(thaw_super); |