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fs/super.c
25.5 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 "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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INIT_LIST_HEAD(&s->s_instances); INIT_HLIST_HEAD(&s->s_anon); 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); 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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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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/* bad name - it should be evict_inodes() */ invalidate_inodes(sb); |
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|
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if (sop->put_super) sop->put_super(sb); /* Forget any remaining inodes */ if (invalidate_inodes(sb)) { |
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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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} } spin_unlock(&sb_lock); return NULL; } EXPORT_SYMBOL(get_super); |
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/** * 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 |
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* reference or %NULL if none was found. |
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*/ struct super_block *get_active_super(struct block_device *bdev) { struct super_block *sb; if (!bdev) return NULL; |
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restart: |
4504230a7 freeze_bdev: grab... |
490 491 |
spin_lock(&sb_lock); list_for_each_entry(sb, &super_blocks, s_list) { |
551de6f34 Leave superblocks... |
492 493 |
if (list_empty(&sb->s_instances)) continue; |
1494583de fix get_active_su... |
494 495 496 497 498 499 |
if (sb->s_bdev == bdev) { if (grab_super(sb)) /* drops sb_lock */ return sb; else goto restart; } |
4504230a7 freeze_bdev: grab... |
500 501 502 503 |
} spin_unlock(&sb_lock); return NULL; } |
1da177e4c Linux-2.6.12-rc2 |
504 |
|
df40c01a9 In get_super() an... |
505 |
struct super_block *user_get_super(dev_t dev) |
1da177e4c Linux-2.6.12-rc2 |
506 |
{ |
618f06362 [PATCH] O(1) sb l... |
507 |
struct super_block *sb; |
1da177e4c Linux-2.6.12-rc2 |
508 |
|
1da177e4c Linux-2.6.12-rc2 |
509 |
spin_lock(&sb_lock); |
618f06362 [PATCH] O(1) sb l... |
510 511 |
rescan: list_for_each_entry(sb, &super_blocks, s_list) { |
551de6f34 Leave superblocks... |
512 513 |
if (list_empty(&sb->s_instances)) continue; |
618f06362 [PATCH] O(1) sb l... |
514 515 |
if (sb->s_dev == dev) { sb->s_count++; |
1da177e4c Linux-2.6.12-rc2 |
516 |
spin_unlock(&sb_lock); |
618f06362 [PATCH] O(1) sb l... |
517 |
down_read(&sb->s_umount); |
df40c01a9 In get_super() an... |
518 |
/* still alive? */ |
618f06362 [PATCH] O(1) sb l... |
519 520 521 |
if (sb->s_root) return sb; up_read(&sb->s_umount); |
df40c01a9 In get_super() an... |
522 |
/* nope, got unmounted */ |
618f06362 [PATCH] O(1) sb l... |
523 |
spin_lock(&sb_lock); |
df40c01a9 In get_super() an... |
524 525 |
__put_super(sb); goto rescan; |
1da177e4c Linux-2.6.12-rc2 |
526 527 528 529 530 |
} } spin_unlock(&sb_lock); return NULL; } |
1da177e4c Linux-2.6.12-rc2 |
531 |
/** |
1da177e4c Linux-2.6.12-rc2 |
532 533 534 535 536 537 538 539 540 541 542 |
* 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... |
543 |
int remount_ro; |
4504230a7 freeze_bdev: grab... |
544 545 546 |
if (sb->s_frozen != SB_UNFROZEN) return -EBUSY; |
9361401eb [PATCH] BLOCK: Ma... |
547 |
#ifdef CONFIG_BLOCK |
1da177e4c Linux-2.6.12-rc2 |
548 549 |
if (!(flags & MS_RDONLY) && bdev_read_only(sb->s_bdev)) return -EACCES; |
9361401eb [PATCH] BLOCK: Ma... |
550 |
#endif |
4504230a7 freeze_bdev: grab... |
551 |
|
1da177e4c Linux-2.6.12-rc2 |
552 553 554 |
if (flags & MS_RDONLY) acct_auto_close(sb); shrink_dcache_sb(sb); |
60b0680fa vfs: Rename fsync... |
555 |
sync_filesystem(sb); |
1da177e4c Linux-2.6.12-rc2 |
556 |
|
d208bbdda fs: improve remou... |
557 |
remount_ro = (flags & MS_RDONLY) && !(sb->s_flags & MS_RDONLY); |
d208bbdda fs: improve remou... |
558 |
|
1da177e4c Linux-2.6.12-rc2 |
559 560 |
/* If we are remounting RDONLY and current sb is read/write, make sure there are no rw files opened */ |
d208bbdda fs: improve remou... |
561 |
if (remount_ro) { |
1da177e4c Linux-2.6.12-rc2 |
562 563 |
if (force) mark_files_ro(sb); |
b0895513f remove unlock_ker... |
564 |
else if (!fs_may_remount_ro(sb)) |
1da177e4c Linux-2.6.12-rc2 |
565 566 567 568 |
return -EBUSY; } if (sb->s_op->remount_fs) { |
1da177e4c Linux-2.6.12-rc2 |
569 |
retval = sb->s_op->remount_fs(sb, &flags, data); |
b0895513f remove unlock_ker... |
570 |
if (retval) |
1da177e4c Linux-2.6.12-rc2 |
571 572 573 |
return retval; } sb->s_flags = (sb->s_flags & ~MS_RMT_MASK) | (flags & MS_RMT_MASK); |
c79d967de quota: move remou... |
574 |
|
d208bbdda fs: improve remou... |
575 576 577 578 579 580 581 582 583 584 |
/* * 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 |
585 586 |
return 0; } |
a2a9537ac Get rid of pdflus... |
587 |
static void do_emergency_remount(struct work_struct *work) |
1da177e4c Linux-2.6.12-rc2 |
588 |
{ |
dca332528 no need for list_... |
589 |
struct super_block *sb, *p = NULL; |
1da177e4c Linux-2.6.12-rc2 |
590 591 |
spin_lock(&sb_lock); |
dca332528 no need for list_... |
592 |
list_for_each_entry(sb, &super_blocks, s_list) { |
551de6f34 Leave superblocks... |
593 594 |
if (list_empty(&sb->s_instances)) continue; |
1da177e4c Linux-2.6.12-rc2 |
595 596 |
sb->s_count++; spin_unlock(&sb_lock); |
443b94baa Make sure that al... |
597 |
down_write(&sb->s_umount); |
1da177e4c Linux-2.6.12-rc2 |
598 599 |
if (sb->s_root && sb->s_bdev && !(sb->s_flags & MS_RDONLY)) { /* |
1da177e4c Linux-2.6.12-rc2 |
600 601 |
* What lock protects sb->s_flags?? */ |
1da177e4c Linux-2.6.12-rc2 |
602 |
do_remount_sb(sb, MS_RDONLY, NULL, 1); |
1da177e4c Linux-2.6.12-rc2 |
603 |
} |
443b94baa Make sure that al... |
604 |
up_write(&sb->s_umount); |
1da177e4c Linux-2.6.12-rc2 |
605 |
spin_lock(&sb_lock); |
dca332528 no need for list_... |
606 607 608 |
if (p) __put_super(p); p = sb; |
1da177e4c Linux-2.6.12-rc2 |
609 |
} |
dca332528 no need for list_... |
610 611 |
if (p) __put_super(p); |
1da177e4c Linux-2.6.12-rc2 |
612 |
spin_unlock(&sb_lock); |
a2a9537ac Get rid of pdflus... |
613 |
kfree(work); |
1da177e4c Linux-2.6.12-rc2 |
614 615 616 617 618 619 |
printk("Emergency Remount complete "); } void emergency_remount(void) { |
a2a9537ac Get rid of pdflus... |
620 621 622 623 624 625 626 |
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 |
627 628 629 630 631 632 |
} /* * Unnamed block devices are dummy devices used by virtual * filesystems which don't use real block-devices. -- jrs */ |
ad76cbc63 [PATCH 2/2] anond... |
633 |
static DEFINE_IDA(unnamed_dev_ida); |
1da177e4c Linux-2.6.12-rc2 |
634 |
static DEFINE_SPINLOCK(unnamed_dev_lock);/* protects the above */ |
c63e09ecc Make allocation o... |
635 |
static int unnamed_dev_start = 0; /* don't bother trying below it */ |
1da177e4c Linux-2.6.12-rc2 |
636 637 638 639 640 641 642 |
int set_anon_super(struct super_block *s, void *data) { int dev; int error; retry: |
ad76cbc63 [PATCH 2/2] anond... |
643 |
if (ida_pre_get(&unnamed_dev_ida, GFP_ATOMIC) == 0) |
1da177e4c Linux-2.6.12-rc2 |
644 645 |
return -ENOMEM; spin_lock(&unnamed_dev_lock); |
c63e09ecc Make allocation o... |
646 |
error = ida_get_new_above(&unnamed_dev_ida, unnamed_dev_start, &dev); |
f21f62208 ... and the same ... |
647 648 |
if (!error) unnamed_dev_start = dev + 1; |
1da177e4c Linux-2.6.12-rc2 |
649 650 651 652 653 654 655 656 657 |
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... |
658 |
ida_remove(&unnamed_dev_ida, dev); |
f21f62208 ... and the same ... |
659 660 |
if (unnamed_dev_start > dev) unnamed_dev_start = dev; |
1da177e4c Linux-2.6.12-rc2 |
661 662 663 664 |
spin_unlock(&unnamed_dev_lock); return -EMFILE; } s->s_dev = MKDEV(0, dev & MINORMASK); |
5129a469a Catch filesystems... |
665 |
s->s_bdi = &noop_backing_dev_info; |
1da177e4c Linux-2.6.12-rc2 |
666 667 668 669 670 671 672 673 674 675 676 |
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... |
677 |
ida_remove(&unnamed_dev_ida, slot); |
c63e09ecc Make allocation o... |
678 679 |
if (slot < unnamed_dev_start) unnamed_dev_start = slot; |
1da177e4c Linux-2.6.12-rc2 |
680 681 682 683 |
spin_unlock(&unnamed_dev_lock); } EXPORT_SYMBOL(kill_anon_super); |
1da177e4c Linux-2.6.12-rc2 |
684 685 686 687 688 689 690 691 |
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 ... |
692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 |
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); } int get_sb_ns(struct file_system_type *fs_type, int flags, void *data, int (*fill_super)(struct super_block *, void *, int), struct vfsmount *mnt) { struct super_block *sb; sb = sget(fs_type, ns_test_super, ns_set_super, data); if (IS_ERR(sb)) return PTR_ERR(sb); 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... |
718 |
deactivate_locked_super(sb); |
909e6d947 namespaces: move ... |
719 720 721 722 723 724 725 726 727 728 729 |
return err; } sb->s_flags |= MS_ACTIVE; } simple_set_mnt(mnt, sb); return 0; } EXPORT_SYMBOL(get_sb_ns); |
9361401eb [PATCH] BLOCK: Ma... |
730 |
#ifdef CONFIG_BLOCK |
1da177e4c Linux-2.6.12-rc2 |
731 732 733 734 |
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... |
735 736 737 738 739 740 |
/* * 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 |
741 742 743 744 745 746 747 |
return 0; } static int test_bdev_super(struct super_block *s, void *data) { return (void *)s->s_bdev == data; } |
454e2398b [PATCH] VFS: Perm... |
748 |
int get_sb_bdev(struct file_system_type *fs_type, |
1da177e4c Linux-2.6.12-rc2 |
749 |
int flags, const char *dev_name, void *data, |
454e2398b [PATCH] VFS: Perm... |
750 751 |
int (*fill_super)(struct super_block *, void *, int), struct vfsmount *mnt) |
1da177e4c Linux-2.6.12-rc2 |
752 753 754 |
{ struct block_device *bdev; struct super_block *s; |
30c40d2c0 [PATCH] propagate... |
755 |
fmode_t mode = FMODE_READ; |
1da177e4c Linux-2.6.12-rc2 |
756 |
int error = 0; |
30c40d2c0 [PATCH] propagate... |
757 758 759 760 |
if (!(flags & MS_RDONLY)) mode |= FMODE_WRITE; bdev = open_bdev_exclusive(dev_name, mode, fs_type); |
1da177e4c Linux-2.6.12-rc2 |
761 |
if (IS_ERR(bdev)) |
454e2398b [PATCH] VFS: Perm... |
762 |
return PTR_ERR(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... |
787 788 789 790 791 792 793 794 |
/* * s_umount nests inside bd_mutex during * __invalidate_device(). close_bdev_exclusive() * 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. */ up_write(&s->s_umount); |
30c40d2c0 [PATCH] propagate... |
795 |
close_bdev_exclusive(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 |
} |
a3ec947c8 vfs: simple_set_m... |
813 814 |
simple_set_mnt(mnt, s); return 0; |
1da177e4c Linux-2.6.12-rc2 |
815 |
|
454e2398b [PATCH] VFS: Perm... |
816 817 818 |
error_s: error = PTR_ERR(s); error_bdev: |
30c40d2c0 [PATCH] propagate... |
819 |
close_bdev_exclusive(bdev, mode); |
454e2398b [PATCH] VFS: Perm... |
820 821 |
error: return error; |
1da177e4c Linux-2.6.12-rc2 |
822 823 824 825 826 827 828 |
} EXPORT_SYMBOL(get_sb_bdev); void kill_block_super(struct super_block *sb) { struct block_device *bdev = sb->s_bdev; |
30c40d2c0 [PATCH] propagate... |
829 |
fmode_t mode = sb->s_mode; |
1da177e4c Linux-2.6.12-rc2 |
830 |
|
ddbaaf302 NULL noise in fs/... |
831 |
bdev->bd_super = NULL; |
1da177e4c Linux-2.6.12-rc2 |
832 833 |
generic_shutdown_super(sb); sync_blockdev(bdev); |
30c40d2c0 [PATCH] propagate... |
834 |
close_bdev_exclusive(bdev, mode); |
1da177e4c Linux-2.6.12-rc2 |
835 836 837 |
} EXPORT_SYMBOL(kill_block_super); |
9361401eb [PATCH] BLOCK: Ma... |
838 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
839 |
|
454e2398b [PATCH] VFS: Perm... |
840 |
int get_sb_nodev(struct file_system_type *fs_type, |
1da177e4c Linux-2.6.12-rc2 |
841 |
int flags, void *data, |
454e2398b [PATCH] VFS: Perm... |
842 843 |
int (*fill_super)(struct super_block *, void *, int), struct vfsmount *mnt) |
1da177e4c Linux-2.6.12-rc2 |
844 845 846 847 848 |
{ int error; struct super_block *s = sget(fs_type, NULL, set_anon_super, NULL); if (IS_ERR(s)) |
454e2398b [PATCH] VFS: Perm... |
849 |
return PTR_ERR(s); |
1da177e4c Linux-2.6.12-rc2 |
850 851 |
s->s_flags = flags; |
9b04c997b [PATCH] vfs: MS_V... |
852 |
error = fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
1da177e4c Linux-2.6.12-rc2 |
853 |
if (error) { |
74dbbdd7f New helper: deact... |
854 |
deactivate_locked_super(s); |
454e2398b [PATCH] VFS: Perm... |
855 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
856 857 |
} s->s_flags |= MS_ACTIVE; |
a3ec947c8 vfs: simple_set_m... |
858 859 |
simple_set_mnt(mnt, s); return 0; |
1da177e4c Linux-2.6.12-rc2 |
860 861 862 863 864 865 866 867 |
} EXPORT_SYMBOL(get_sb_nodev); static int compare_single(struct super_block *s, void *p) { return 1; } |
454e2398b [PATCH] VFS: Perm... |
868 |
int get_sb_single(struct file_system_type *fs_type, |
1da177e4c Linux-2.6.12-rc2 |
869 |
int flags, void *data, |
454e2398b [PATCH] VFS: Perm... |
870 871 |
int (*fill_super)(struct super_block *, void *, int), struct vfsmount *mnt) |
1da177e4c Linux-2.6.12-rc2 |
872 873 874 875 876 877 |
{ struct super_block *s; int error; s = sget(fs_type, compare_single, set_anon_super, NULL); if (IS_ERR(s)) |
454e2398b [PATCH] VFS: Perm... |
878 |
return PTR_ERR(s); |
1da177e4c Linux-2.6.12-rc2 |
879 880 |
if (!s->s_root) { s->s_flags = flags; |
9b04c997b [PATCH] vfs: MS_V... |
881 |
error = fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
1da177e4c Linux-2.6.12-rc2 |
882 |
if (error) { |
74dbbdd7f New helper: deact... |
883 |
deactivate_locked_super(s); |
454e2398b [PATCH] VFS: Perm... |
884 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
885 886 |
} s->s_flags |= MS_ACTIVE; |
9329d1bea vfs: get_sb_singl... |
887 888 |
} else { do_remount_sb(s, flags, data, 0); |
1da177e4c Linux-2.6.12-rc2 |
889 |
} |
a3ec947c8 vfs: simple_set_m... |
890 891 |
simple_set_mnt(mnt, s); return 0; |
1da177e4c Linux-2.6.12-rc2 |
892 893 894 895 896 |
} EXPORT_SYMBOL(get_sb_single); struct vfsmount * |
bb4a58bf4 VFS: Add GPL_EXPO... |
897 |
vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void *data) |
1da177e4c Linux-2.6.12-rc2 |
898 |
{ |
1da177e4c Linux-2.6.12-rc2 |
899 |
struct vfsmount *mnt; |
1da177e4c Linux-2.6.12-rc2 |
900 |
char *secdata = NULL; |
454e2398b [PATCH] VFS: Perm... |
901 |
int error; |
1da177e4c Linux-2.6.12-rc2 |
902 903 904 |
if (!type) return ERR_PTR(-ENODEV); |
1da177e4c Linux-2.6.12-rc2 |
905 |
|
454e2398b [PATCH] VFS: Perm... |
906 |
error = -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
907 908 909 |
mnt = alloc_vfsmnt(name); if (!mnt) goto out; |
8089352a1 Mirror MS_KERNMOU... |
910 911 |
if (flags & MS_KERNMOUNT) mnt->mnt_flags = MNT_INTERNAL; |
e00075298 LSM/SELinux: Inte... |
912 |
if (data && !(type->fs_flags & FS_BINARY_MOUNTDATA)) { |
1da177e4c Linux-2.6.12-rc2 |
913 |
secdata = alloc_secdata(); |
454e2398b [PATCH] VFS: Perm... |
914 |
if (!secdata) |
1da177e4c Linux-2.6.12-rc2 |
915 |
goto out_mnt; |
1da177e4c Linux-2.6.12-rc2 |
916 |
|
e00075298 LSM/SELinux: Inte... |
917 |
error = security_sb_copy_data(data, secdata); |
454e2398b [PATCH] VFS: Perm... |
918 |
if (error) |
1da177e4c Linux-2.6.12-rc2 |
919 |
goto out_free_secdata; |
1da177e4c Linux-2.6.12-rc2 |
920 |
} |
454e2398b [PATCH] VFS: Perm... |
921 922 |
error = type->get_sb(type, flags, name, data, mnt); if (error < 0) |
1da177e4c Linux-2.6.12-rc2 |
923 |
goto out_free_secdata; |
b4c07bce7 hugetlbfs: handle... |
924 |
BUG_ON(!mnt->mnt_sb); |
5129a469a Catch filesystems... |
925 |
WARN_ON(!mnt->mnt_sb->s_bdi); |
7a4dec538 Fix sget() race w... |
926 |
mnt->mnt_sb->s_flags |= MS_BORN; |
454e2398b [PATCH] VFS: Perm... |
927 |
|
5129a469a Catch filesystems... |
928 929 930 |
error = security_sb_kern_mount(mnt->mnt_sb, flags, secdata); if (error) goto out_sb; |
454e2398b [PATCH] VFS: Perm... |
931 |
|
42cb56ae2 vfs: change sb->s... |
932 933 934 935 936 937 938 939 940 941 |
/* * 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. */ WARN((mnt->mnt_sb->s_maxbytes < 0), "%s set sb->s_maxbytes to " "negative value (%lld) ", type->name, mnt->mnt_sb->s_maxbytes); |
454e2398b [PATCH] VFS: Perm... |
942 |
mnt->mnt_mountpoint = mnt->mnt_root; |
1da177e4c Linux-2.6.12-rc2 |
943 |
mnt->mnt_parent = mnt; |
454e2398b [PATCH] VFS: Perm... |
944 |
up_write(&mnt->mnt_sb->s_umount); |
8680e22f2 [PATCH] VFS: memo... |
945 |
free_secdata(secdata); |
1da177e4c Linux-2.6.12-rc2 |
946 947 |
return mnt; out_sb: |
454e2398b [PATCH] VFS: Perm... |
948 |
dput(mnt->mnt_root); |
74dbbdd7f New helper: deact... |
949 |
deactivate_locked_super(mnt->mnt_sb); |
1da177e4c Linux-2.6.12-rc2 |
950 951 952 953 954 |
out_free_secdata: free_secdata(secdata); out_mnt: free_vfsmnt(mnt); out: |
454e2398b [PATCH] VFS: Perm... |
955 |
return ERR_PTR(error); |
1da177e4c Linux-2.6.12-rc2 |
956 |
} |
bb4a58bf4 VFS: Add GPL_EXPO... |
957 |
EXPORT_SYMBOL_GPL(vfs_kern_mount); |
18e9e5104 Introduce freeze_... |
958 |
/** |
7000d3c42 fs/super: fix ker... |
959 960 |
* freeze_super - lock the filesystem and force it into a consistent state * @sb: the super to lock |
18e9e5104 Introduce freeze_... |
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 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 |
* * 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); |
79c0b2df7 add filesystem su... |
1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 |
static struct vfsmount *fs_set_subtype(struct vfsmount *mnt, const char *fstype) { int err; const char *subtype = strchr(fstype, '.'); if (subtype) { subtype++; err = -EINVAL; if (!subtype[0]) goto err; } else subtype = ""; mnt->mnt_sb->s_subtype = kstrdup(subtype, GFP_KERNEL); err = -ENOMEM; if (!mnt->mnt_sb->s_subtype) goto err; return mnt; err: mntput(mnt); return ERR_PTR(err); } |
bb4a58bf4 VFS: Add GPL_EXPO... |
1071 1072 1073 1074 1075 1076 1077 1078 |
struct vfsmount * do_kern_mount(const char *fstype, int flags, const char *name, void *data) { struct file_system_type *type = get_fs_type(fstype); struct vfsmount *mnt; if (!type) return ERR_PTR(-ENODEV); mnt = vfs_kern_mount(type, flags, name, data); |
79c0b2df7 add filesystem su... |
1079 1080 1081 |
if (!IS_ERR(mnt) && (type->fs_flags & FS_HAS_SUBTYPE) && !mnt->mnt_sb->s_subtype) mnt = fs_set_subtype(mnt, fstype); |
bb4a58bf4 VFS: Add GPL_EXPO... |
1082 1083 1084 |
put_filesystem(type); return mnt; } |
8a4e98d9d [PATCH] restore e... |
1085 |
EXPORT_SYMBOL_GPL(do_kern_mount); |
bb4a58bf4 VFS: Add GPL_EXPO... |
1086 |
|
8bf9725c2 pid namespaces: i... |
1087 |
struct vfsmount *kern_mount_data(struct file_system_type *type, void *data) |
1da177e4c Linux-2.6.12-rc2 |
1088 |
{ |
8bf9725c2 pid namespaces: i... |
1089 |
return vfs_kern_mount(type, MS_KERNMOUNT, type->name, data); |
1da177e4c Linux-2.6.12-rc2 |
1090 |
} |
8bf9725c2 pid namespaces: i... |
1091 |
EXPORT_SYMBOL_GPL(kern_mount_data); |