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fs/super.c
28.3 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 <linux/cleancache.h> |
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#include "internal.h" |
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|
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LIST_HEAD(super_blocks); DEFINE_SPINLOCK(sb_lock); |
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/* * One thing we have to be careful of with a per-sb shrinker is that we don't * drop the last active reference to the superblock from within the shrinker. * If that happens we could trigger unregistering the shrinker from within the * shrinker path and that leads to deadlock on the shrinker_rwsem. Hence we * take a passive reference to the superblock to avoid this from occurring. */ static int prune_super(struct shrinker *shrink, struct shrink_control *sc) { struct super_block *sb; |
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int fs_objects = 0; int total_objects; |
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sb = container_of(shrink, struct super_block, s_shrink); /* * Deadlock avoidance. We may hold various FS locks, and we don't want * to recurse into the FS that called us in clear_inode() and friends.. */ if (sc->nr_to_scan && !(sc->gfp_mask & __GFP_FS)) return -1; if (!grab_super_passive(sb)) return -1; |
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if (sb->s_op && sb->s_op->nr_cached_objects) fs_objects = sb->s_op->nr_cached_objects(sb); total_objects = sb->s_nr_dentry_unused + sb->s_nr_inodes_unused + fs_objects + 1; |
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if (sc->nr_to_scan) { |
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int dentries; int inodes; |
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|
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/* proportion the scan between the caches */ dentries = (sc->nr_to_scan * sb->s_nr_dentry_unused) / total_objects; inodes = (sc->nr_to_scan * sb->s_nr_inodes_unused) / total_objects; if (fs_objects) fs_objects = (sc->nr_to_scan * fs_objects) / total_objects; /* * prune the dcache first as the icache is pinned by it, then * prune the icache, followed by the filesystem specific caches */ prune_dcache_sb(sb, dentries); prune_icache_sb(sb, inodes); |
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|
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if (fs_objects && sb->s_op->free_cached_objects) { sb->s_op->free_cached_objects(sb, fs_objects); fs_objects = sb->s_op->nr_cached_objects(sb); } total_objects = sb->s_nr_dentry_unused + sb->s_nr_inodes_unused + fs_objects; |
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} |
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total_objects = (total_objects / 100) * sysctl_vfs_cache_pressure; |
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drop_super(sb); |
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return total_objects; |
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} |
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/** * 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_LIST_HEAD(&s->s_inode_lru); |
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spin_lock_init(&s->s_inode_lru_lock); |
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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; |
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s->cleancache_poolid = -1; |
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s->s_shrink.seeks = DEFAULT_SEEKS; s->s_shrink.shrink = prune_super; |
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s->s_shrink.batch = 1024; |
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} 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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cleancache_flush_fs(s); |
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fs->kill_sb(s); |
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/* caches are now gone, we can safely kill the shrinker now */ unregister_shrinker(&s->s_shrink); |
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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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* grab_super_passive - acquire a passive reference * @s: reference we are trying to grab * * Tries to acquire a passive reference. This is used in places where we * cannot take an active reference but we need to ensure that the * superblock does not go away while we are working on it. It returns * false if a reference was not gained, and returns true with the s_umount * lock held in read mode if a reference is gained. On successful return, * the caller must drop the s_umount lock and the passive reference when * done. */ bool grab_super_passive(struct super_block *sb) { spin_lock(&sb_lock); if (list_empty(&sb->s_instances)) { spin_unlock(&sb_lock); return false; } sb->s_count++; spin_unlock(&sb_lock); if (down_read_trylock(&sb->s_umount)) { if (sb->s_root) return true; up_read(&sb->s_umount); } put_super(sb); return false; } /* |
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* Superblock locking. We really ought to get rid of these two. */ void lock_super(struct super_block * sb) { |
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mutex_lock(&sb->s_lock); } void unlock_super(struct super_block * sb) { |
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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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if (sb->s_root) { shrink_dcache_for_umount(sb); |
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sync_filesystem(sb); |
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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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} 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); |
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register_shrinker(&s->s_shrink); |
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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); |
dca332528 no need for list_... |
486 |
list_for_each_entry(sb, &super_blocks, s_list) { |
551de6f34 Leave superblocks... |
487 488 |
if (list_empty(&sb->s_instances)) continue; |
e50047533 cleanup sync_supers |
489 |
if (sb->s_op->write_super && sb->s_dirt) { |
1da177e4c Linux-2.6.12-rc2 |
490 491 |
sb->s_count++; spin_unlock(&sb_lock); |
e50047533 cleanup sync_supers |
492 |
|
1da177e4c Linux-2.6.12-rc2 |
493 |
down_read(&sb->s_umount); |
e50047533 cleanup sync_supers |
494 495 |
if (sb->s_root && sb->s_dirt) sb->s_op->write_super(sb); |
618f06362 [PATCH] O(1) sb l... |
496 |
up_read(&sb->s_umount); |
e50047533 cleanup sync_supers |
497 |
|
618f06362 [PATCH] O(1) sb l... |
498 |
spin_lock(&sb_lock); |
dca332528 no need for list_... |
499 500 501 |
if (p) __put_super(p); p = sb; |
618f06362 [PATCH] O(1) sb l... |
502 503 |
} } |
dca332528 no need for list_... |
504 505 |
if (p) __put_super(p); |
1da177e4c Linux-2.6.12-rc2 |
506 507 |
spin_unlock(&sb_lock); } |
1da177e4c Linux-2.6.12-rc2 |
508 |
/** |
01a05b337 new helper: itera... |
509 510 511 512 513 514 515 516 517 |
* 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) { |
dca332528 no need for list_... |
518 |
struct super_block *sb, *p = NULL; |
01a05b337 new helper: itera... |
519 520 |
spin_lock(&sb_lock); |
dca332528 no need for list_... |
521 |
list_for_each_entry(sb, &super_blocks, s_list) { |
01a05b337 new helper: itera... |
522 523 524 525 526 527 528 529 530 531 532 |
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); |
dca332528 no need for list_... |
533 534 535 |
if (p) __put_super(p); p = sb; |
01a05b337 new helper: itera... |
536 |
} |
dca332528 no need for list_... |
537 538 |
if (p) __put_super(p); |
01a05b337 new helper: itera... |
539 540 541 542 |
spin_unlock(&sb_lock); } /** |
43e15cdbe new helper: itera... |
543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 |
* iterate_supers_type - call function for superblocks of given type * @type: fs type * @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_type(struct file_system_type *type, void (*f)(struct super_block *, void *), void *arg) { struct super_block *sb, *p = NULL; spin_lock(&sb_lock); list_for_each_entry(sb, &type->fs_supers, s_instances) { 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); if (p) __put_super(p); p = sb; } if (p) __put_super(p); spin_unlock(&sb_lock); } EXPORT_SYMBOL(iterate_supers_type); /** |
1da177e4c Linux-2.6.12-rc2 |
579 580 581 582 583 584 |
* 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. */ |
df40c01a9 In get_super() an... |
585 |
struct super_block *get_super(struct block_device *bdev) |
1da177e4c Linux-2.6.12-rc2 |
586 |
{ |
618f06362 [PATCH] O(1) sb l... |
587 |
struct super_block *sb; |
1da177e4c Linux-2.6.12-rc2 |
588 589 |
if (!bdev) return NULL; |
618f06362 [PATCH] O(1) sb l... |
590 |
|
1da177e4c Linux-2.6.12-rc2 |
591 |
spin_lock(&sb_lock); |
618f06362 [PATCH] O(1) sb l... |
592 593 |
rescan: list_for_each_entry(sb, &super_blocks, s_list) { |
551de6f34 Leave superblocks... |
594 595 |
if (list_empty(&sb->s_instances)) continue; |
618f06362 [PATCH] O(1) sb l... |
596 597 |
if (sb->s_bdev == bdev) { sb->s_count++; |
1da177e4c Linux-2.6.12-rc2 |
598 |
spin_unlock(&sb_lock); |
618f06362 [PATCH] O(1) sb l... |
599 |
down_read(&sb->s_umount); |
df40c01a9 In get_super() an... |
600 |
/* still alive? */ |
618f06362 [PATCH] O(1) sb l... |
601 602 603 |
if (sb->s_root) return sb; up_read(&sb->s_umount); |
df40c01a9 In get_super() an... |
604 |
/* nope, got unmounted */ |
618f06362 [PATCH] O(1) sb l... |
605 |
spin_lock(&sb_lock); |
df40c01a9 In get_super() an... |
606 607 |
__put_super(sb); goto rescan; |
1da177e4c Linux-2.6.12-rc2 |
608 609 610 611 612 613 614 |
} } spin_unlock(&sb_lock); return NULL; } EXPORT_SYMBOL(get_super); |
4504230a7 freeze_bdev: grab... |
615 616 617 618 619 620 621 |
/** * 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... |
622 |
* reference or %NULL if none was found. |
4504230a7 freeze_bdev: grab... |
623 624 625 626 627 628 629 |
*/ struct super_block *get_active_super(struct block_device *bdev) { struct super_block *sb; if (!bdev) return NULL; |
1494583de fix get_active_su... |
630 |
restart: |
4504230a7 freeze_bdev: grab... |
631 632 |
spin_lock(&sb_lock); list_for_each_entry(sb, &super_blocks, s_list) { |
551de6f34 Leave superblocks... |
633 634 |
if (list_empty(&sb->s_instances)) continue; |
1494583de fix get_active_su... |
635 636 637 638 639 640 |
if (sb->s_bdev == bdev) { if (grab_super(sb)) /* drops sb_lock */ return sb; else goto restart; } |
4504230a7 freeze_bdev: grab... |
641 642 643 644 |
} spin_unlock(&sb_lock); return NULL; } |
1da177e4c Linux-2.6.12-rc2 |
645 |
|
df40c01a9 In get_super() an... |
646 |
struct super_block *user_get_super(dev_t dev) |
1da177e4c Linux-2.6.12-rc2 |
647 |
{ |
618f06362 [PATCH] O(1) sb l... |
648 |
struct super_block *sb; |
1da177e4c Linux-2.6.12-rc2 |
649 |
|
1da177e4c Linux-2.6.12-rc2 |
650 |
spin_lock(&sb_lock); |
618f06362 [PATCH] O(1) sb l... |
651 652 |
rescan: list_for_each_entry(sb, &super_blocks, s_list) { |
551de6f34 Leave superblocks... |
653 654 |
if (list_empty(&sb->s_instances)) continue; |
618f06362 [PATCH] O(1) sb l... |
655 656 |
if (sb->s_dev == dev) { sb->s_count++; |
1da177e4c Linux-2.6.12-rc2 |
657 |
spin_unlock(&sb_lock); |
618f06362 [PATCH] O(1) sb l... |
658 |
down_read(&sb->s_umount); |
df40c01a9 In get_super() an... |
659 |
/* still alive? */ |
618f06362 [PATCH] O(1) sb l... |
660 661 662 |
if (sb->s_root) return sb; up_read(&sb->s_umount); |
df40c01a9 In get_super() an... |
663 |
/* nope, got unmounted */ |
618f06362 [PATCH] O(1) sb l... |
664 |
spin_lock(&sb_lock); |
df40c01a9 In get_super() an... |
665 666 |
__put_super(sb); goto rescan; |
1da177e4c Linux-2.6.12-rc2 |
667 668 669 670 671 |
} } spin_unlock(&sb_lock); return NULL; } |
1da177e4c Linux-2.6.12-rc2 |
672 |
/** |
1da177e4c Linux-2.6.12-rc2 |
673 674 675 676 677 678 679 680 681 682 683 |
* 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... |
684 |
int remount_ro; |
4504230a7 freeze_bdev: grab... |
685 686 687 |
if (sb->s_frozen != SB_UNFROZEN) return -EBUSY; |
9361401eb [PATCH] BLOCK: Ma... |
688 |
#ifdef CONFIG_BLOCK |
1da177e4c Linux-2.6.12-rc2 |
689 690 |
if (!(flags & MS_RDONLY) && bdev_read_only(sb->s_bdev)) return -EACCES; |
9361401eb [PATCH] BLOCK: Ma... |
691 |
#endif |
4504230a7 freeze_bdev: grab... |
692 |
|
1da177e4c Linux-2.6.12-rc2 |
693 694 695 |
if (flags & MS_RDONLY) acct_auto_close(sb); shrink_dcache_sb(sb); |
60b0680fa vfs: Rename fsync... |
696 |
sync_filesystem(sb); |
1da177e4c Linux-2.6.12-rc2 |
697 |
|
d208bbdda fs: improve remou... |
698 |
remount_ro = (flags & MS_RDONLY) && !(sb->s_flags & MS_RDONLY); |
d208bbdda fs: improve remou... |
699 |
|
1da177e4c Linux-2.6.12-rc2 |
700 701 |
/* If we are remounting RDONLY and current sb is read/write, make sure there are no rw files opened */ |
d208bbdda fs: improve remou... |
702 |
if (remount_ro) { |
1da177e4c Linux-2.6.12-rc2 |
703 704 |
if (force) mark_files_ro(sb); |
b0895513f remove unlock_ker... |
705 |
else if (!fs_may_remount_ro(sb)) |
1da177e4c Linux-2.6.12-rc2 |
706 707 708 709 |
return -EBUSY; } if (sb->s_op->remount_fs) { |
1da177e4c Linux-2.6.12-rc2 |
710 |
retval = sb->s_op->remount_fs(sb, &flags, data); |
b0895513f remove unlock_ker... |
711 |
if (retval) |
1da177e4c Linux-2.6.12-rc2 |
712 713 714 |
return retval; } sb->s_flags = (sb->s_flags & ~MS_RMT_MASK) | (flags & MS_RMT_MASK); |
c79d967de quota: move remou... |
715 |
|
d208bbdda fs: improve remou... |
716 717 718 719 720 721 722 723 724 725 |
/* * 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 |
726 727 |
return 0; } |
a2a9537ac Get rid of pdflus... |
728 |
static void do_emergency_remount(struct work_struct *work) |
1da177e4c Linux-2.6.12-rc2 |
729 |
{ |
dca332528 no need for list_... |
730 |
struct super_block *sb, *p = NULL; |
1da177e4c Linux-2.6.12-rc2 |
731 732 |
spin_lock(&sb_lock); |
dca332528 no need for list_... |
733 |
list_for_each_entry(sb, &super_blocks, s_list) { |
551de6f34 Leave superblocks... |
734 735 |
if (list_empty(&sb->s_instances)) continue; |
1da177e4c Linux-2.6.12-rc2 |
736 737 |
sb->s_count++; spin_unlock(&sb_lock); |
443b94baa Make sure that al... |
738 |
down_write(&sb->s_umount); |
1da177e4c Linux-2.6.12-rc2 |
739 740 |
if (sb->s_root && sb->s_bdev && !(sb->s_flags & MS_RDONLY)) { /* |
1da177e4c Linux-2.6.12-rc2 |
741 742 |
* What lock protects sb->s_flags?? */ |
1da177e4c Linux-2.6.12-rc2 |
743 |
do_remount_sb(sb, MS_RDONLY, NULL, 1); |
1da177e4c Linux-2.6.12-rc2 |
744 |
} |
443b94baa Make sure that al... |
745 |
up_write(&sb->s_umount); |
1da177e4c Linux-2.6.12-rc2 |
746 |
spin_lock(&sb_lock); |
dca332528 no need for list_... |
747 748 749 |
if (p) __put_super(p); p = sb; |
1da177e4c Linux-2.6.12-rc2 |
750 |
} |
dca332528 no need for list_... |
751 752 |
if (p) __put_super(p); |
1da177e4c Linux-2.6.12-rc2 |
753 |
spin_unlock(&sb_lock); |
a2a9537ac Get rid of pdflus... |
754 |
kfree(work); |
1da177e4c Linux-2.6.12-rc2 |
755 756 757 758 759 760 |
printk("Emergency Remount complete "); } void emergency_remount(void) { |
a2a9537ac Get rid of pdflus... |
761 762 763 764 765 766 767 |
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 |
768 769 770 771 772 773 |
} /* * Unnamed block devices are dummy devices used by virtual * filesystems which don't use real block-devices. -- jrs */ |
ad76cbc63 [PATCH 2/2] anond... |
774 |
static DEFINE_IDA(unnamed_dev_ida); |
1da177e4c Linux-2.6.12-rc2 |
775 |
static DEFINE_SPINLOCK(unnamed_dev_lock);/* protects the above */ |
c63e09ecc Make allocation o... |
776 |
static int unnamed_dev_start = 0; /* don't bother trying below it */ |
1da177e4c Linux-2.6.12-rc2 |
777 |
|
0ee5dc676 btrfs: kill magic... |
778 |
int get_anon_bdev(dev_t *p) |
1da177e4c Linux-2.6.12-rc2 |
779 780 781 782 783 |
{ int dev; int error; retry: |
ad76cbc63 [PATCH 2/2] anond... |
784 |
if (ida_pre_get(&unnamed_dev_ida, GFP_ATOMIC) == 0) |
1da177e4c Linux-2.6.12-rc2 |
785 786 |
return -ENOMEM; spin_lock(&unnamed_dev_lock); |
c63e09ecc Make allocation o... |
787 |
error = ida_get_new_above(&unnamed_dev_ida, unnamed_dev_start, &dev); |
f21f62208 ... and the same ... |
788 789 |
if (!error) unnamed_dev_start = dev + 1; |
1da177e4c Linux-2.6.12-rc2 |
790 791 792 793 794 795 796 797 798 |
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... |
799 |
ida_remove(&unnamed_dev_ida, dev); |
f21f62208 ... and the same ... |
800 801 |
if (unnamed_dev_start > dev) unnamed_dev_start = dev; |
1da177e4c Linux-2.6.12-rc2 |
802 803 804 |
spin_unlock(&unnamed_dev_lock); return -EMFILE; } |
0ee5dc676 btrfs: kill magic... |
805 |
*p = MKDEV(0, dev & MINORMASK); |
1da177e4c Linux-2.6.12-rc2 |
806 807 |
return 0; } |
0ee5dc676 btrfs: kill magic... |
808 |
EXPORT_SYMBOL(get_anon_bdev); |
1da177e4c Linux-2.6.12-rc2 |
809 |
|
0ee5dc676 btrfs: kill magic... |
810 |
void free_anon_bdev(dev_t dev) |
1da177e4c Linux-2.6.12-rc2 |
811 |
{ |
0ee5dc676 btrfs: kill magic... |
812 |
int slot = MINOR(dev); |
1da177e4c Linux-2.6.12-rc2 |
813 |
spin_lock(&unnamed_dev_lock); |
ad76cbc63 [PATCH 2/2] anond... |
814 |
ida_remove(&unnamed_dev_ida, slot); |
c63e09ecc Make allocation o... |
815 816 |
if (slot < unnamed_dev_start) unnamed_dev_start = slot; |
1da177e4c Linux-2.6.12-rc2 |
817 818 |
spin_unlock(&unnamed_dev_lock); } |
0ee5dc676 btrfs: kill magic... |
819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 |
EXPORT_SYMBOL(free_anon_bdev); int set_anon_super(struct super_block *s, void *data) { int error = get_anon_bdev(&s->s_dev); if (!error) s->s_bdi = &noop_backing_dev_info; return error; } EXPORT_SYMBOL(set_anon_super); void kill_anon_super(struct super_block *sb) { dev_t dev = sb->s_dev; generic_shutdown_super(sb); free_anon_bdev(dev); } |
1da177e4c Linux-2.6.12-rc2 |
837 838 |
EXPORT_SYMBOL(kill_anon_super); |
1da177e4c Linux-2.6.12-rc2 |
839 840 841 842 843 844 845 846 |
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 ... |
847 848 849 850 851 852 853 854 855 856 |
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(... |
857 858 |
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 ... |
859 860 861 862 863 |
{ struct super_block *sb; sb = sget(fs_type, ns_test_super, ns_set_super, data); if (IS_ERR(sb)) |
ceefda693 switch get_sb_ns(... |
864 |
return ERR_CAST(sb); |
909e6d947 namespaces: move ... |
865 866 867 868 869 870 |
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... |
871 |
deactivate_locked_super(sb); |
ceefda693 switch get_sb_ns(... |
872 |
return ERR_PTR(err); |
909e6d947 namespaces: move ... |
873 874 875 876 |
} sb->s_flags |= MS_ACTIVE; } |
ceefda693 switch get_sb_ns(... |
877 |
return dget(sb->s_root); |
909e6d947 namespaces: move ... |
878 |
} |
ceefda693 switch get_sb_ns(... |
879 |
EXPORT_SYMBOL(mount_ns); |
909e6d947 namespaces: move ... |
880 |
|
9361401eb [PATCH] BLOCK: Ma... |
881 |
#ifdef CONFIG_BLOCK |
1da177e4c Linux-2.6.12-rc2 |
882 883 884 885 |
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... |
886 887 888 889 890 891 |
/* * 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 |
892 893 894 895 896 897 898 |
return 0; } static int test_bdev_super(struct super_block *s, void *data) { return (void *)s->s_bdev == data; } |
152a08366 new helper: mount... |
899 |
struct dentry *mount_bdev(struct file_system_type *fs_type, |
1da177e4c Linux-2.6.12-rc2 |
900 |
int flags, const char *dev_name, void *data, |
152a08366 new helper: mount... |
901 |
int (*fill_super)(struct super_block *, void *, int)) |
1da177e4c Linux-2.6.12-rc2 |
902 903 904 |
{ struct block_device *bdev; struct super_block *s; |
d4d776299 block: clean up b... |
905 |
fmode_t mode = FMODE_READ | FMODE_EXCL; |
1da177e4c Linux-2.6.12-rc2 |
906 |
int error = 0; |
30c40d2c0 [PATCH] propagate... |
907 908 |
if (!(flags & MS_RDONLY)) mode |= FMODE_WRITE; |
d4d776299 block: clean up b... |
909 |
bdev = blkdev_get_by_path(dev_name, mode, fs_type); |
1da177e4c Linux-2.6.12-rc2 |
910 |
if (IS_ERR(bdev)) |
152a08366 new helper: mount... |
911 |
return ERR_CAST(bdev); |
1da177e4c Linux-2.6.12-rc2 |
912 913 914 915 916 917 |
/* * 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... |
918 919 920 921 922 923 |
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 |
924 |
s = sget(fs_type, test_bdev_super, set_bdev_super, bdev); |
4fadd7bb2 freeze_bdev: kill... |
925 |
mutex_unlock(&bdev->bd_fsfreeze_mutex); |
1da177e4c Linux-2.6.12-rc2 |
926 |
if (IS_ERR(s)) |
454e2398b [PATCH] VFS: Perm... |
927 |
goto error_s; |
1da177e4c Linux-2.6.12-rc2 |
928 929 930 |
if (s->s_root) { if ((flags ^ s->s_flags) & MS_RDONLY) { |
74dbbdd7f New helper: deact... |
931 |
deactivate_locked_super(s); |
454e2398b [PATCH] VFS: Perm... |
932 933 |
error = -EBUSY; goto error_bdev; |
1da177e4c Linux-2.6.12-rc2 |
934 |
} |
454e2398b [PATCH] VFS: Perm... |
935 |
|
4f331f01b vfs: don't hold s... |
936 937 |
/* * s_umount nests inside bd_mutex during |
e525fd89d block: make blkde... |
938 939 940 941 |
* __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... |
942 943 |
*/ up_write(&s->s_umount); |
d4d776299 block: clean up b... |
944 |
blkdev_put(bdev, mode); |
4f331f01b vfs: don't hold s... |
945 |
down_write(&s->s_umount); |
1da177e4c Linux-2.6.12-rc2 |
946 947 |
} else { char b[BDEVNAME_SIZE]; |
9e1f1de02 more conservative... |
948 |
s->s_flags = flags | MS_NOSEC; |
30c40d2c0 [PATCH] propagate... |
949 |
s->s_mode = mode; |
1da177e4c Linux-2.6.12-rc2 |
950 |
strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); |
e78c9a004 [PATCH] fs: remov... |
951 |
sb_set_blocksize(s, block_size(bdev)); |
9b04c997b [PATCH] vfs: MS_V... |
952 |
error = fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
1da177e4c Linux-2.6.12-rc2 |
953 |
if (error) { |
74dbbdd7f New helper: deact... |
954 |
deactivate_locked_super(s); |
454e2398b [PATCH] VFS: Perm... |
955 |
goto error; |
fa675765a Revert mount/umou... |
956 |
} |
454e2398b [PATCH] VFS: Perm... |
957 958 |
s->s_flags |= MS_ACTIVE; |
87d8fe1ee add releasepage h... |
959 |
bdev->bd_super = s; |
1da177e4c Linux-2.6.12-rc2 |
960 |
} |
152a08366 new helper: mount... |
961 |
return dget(s->s_root); |
1da177e4c Linux-2.6.12-rc2 |
962 |
|
454e2398b [PATCH] VFS: Perm... |
963 964 965 |
error_s: error = PTR_ERR(s); error_bdev: |
d4d776299 block: clean up b... |
966 |
blkdev_put(bdev, mode); |
454e2398b [PATCH] VFS: Perm... |
967 |
error: |
152a08366 new helper: mount... |
968 969 970 |
return ERR_PTR(error); } EXPORT_SYMBOL(mount_bdev); |
1da177e4c Linux-2.6.12-rc2 |
971 972 973 |
void kill_block_super(struct super_block *sb) { struct block_device *bdev = sb->s_bdev; |
30c40d2c0 [PATCH] propagate... |
974 |
fmode_t mode = sb->s_mode; |
1da177e4c Linux-2.6.12-rc2 |
975 |
|
ddbaaf302 NULL noise in fs/... |
976 |
bdev->bd_super = NULL; |
1da177e4c Linux-2.6.12-rc2 |
977 978 |
generic_shutdown_super(sb); sync_blockdev(bdev); |
d4d776299 block: clean up b... |
979 |
WARN_ON_ONCE(!(mode & FMODE_EXCL)); |
e525fd89d block: make blkde... |
980 |
blkdev_put(bdev, mode | FMODE_EXCL); |
1da177e4c Linux-2.6.12-rc2 |
981 982 983 |
} EXPORT_SYMBOL(kill_block_super); |
9361401eb [PATCH] BLOCK: Ma... |
984 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
985 |
|
3c26ff6e4 convert get_sb_no... |
986 |
struct dentry *mount_nodev(struct file_system_type *fs_type, |
1da177e4c Linux-2.6.12-rc2 |
987 |
int flags, void *data, |
3c26ff6e4 convert get_sb_no... |
988 |
int (*fill_super)(struct super_block *, void *, int)) |
1da177e4c Linux-2.6.12-rc2 |
989 990 991 992 993 |
{ int error; struct super_block *s = sget(fs_type, NULL, set_anon_super, NULL); if (IS_ERR(s)) |
3c26ff6e4 convert get_sb_no... |
994 |
return ERR_CAST(s); |
1da177e4c Linux-2.6.12-rc2 |
995 996 |
s->s_flags = flags; |
9b04c997b [PATCH] vfs: MS_V... |
997 |
error = fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
1da177e4c Linux-2.6.12-rc2 |
998 |
if (error) { |
74dbbdd7f New helper: deact... |
999 |
deactivate_locked_super(s); |
3c26ff6e4 convert get_sb_no... |
1000 |
return ERR_PTR(error); |
1da177e4c Linux-2.6.12-rc2 |
1001 1002 |
} s->s_flags |= MS_ACTIVE; |
3c26ff6e4 convert get_sb_no... |
1003 |
return dget(s->s_root); |
1da177e4c Linux-2.6.12-rc2 |
1004 |
} |
3c26ff6e4 convert get_sb_no... |
1005 |
EXPORT_SYMBOL(mount_nodev); |
1da177e4c Linux-2.6.12-rc2 |
1006 1007 1008 1009 |
static int compare_single(struct super_block *s, void *p) { return 1; } |
fc14f2fef convert get_sb_si... |
1010 |
struct dentry *mount_single(struct file_system_type *fs_type, |
1da177e4c Linux-2.6.12-rc2 |
1011 |
int flags, void *data, |
fc14f2fef convert get_sb_si... |
1012 |
int (*fill_super)(struct super_block *, void *, int)) |
1da177e4c Linux-2.6.12-rc2 |
1013 1014 1015 1016 1017 1018 |
{ 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... |
1019 |
return ERR_CAST(s); |
1da177e4c Linux-2.6.12-rc2 |
1020 1021 |
if (!s->s_root) { s->s_flags = flags; |
9b04c997b [PATCH] vfs: MS_V... |
1022 |
error = fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
1da177e4c Linux-2.6.12-rc2 |
1023 |
if (error) { |
74dbbdd7f New helper: deact... |
1024 |
deactivate_locked_super(s); |
fc14f2fef convert get_sb_si... |
1025 |
return ERR_PTR(error); |
1da177e4c Linux-2.6.12-rc2 |
1026 1027 |
} s->s_flags |= MS_ACTIVE; |
9329d1bea vfs: get_sb_singl... |
1028 1029 |
} else { do_remount_sb(s, flags, data, 0); |
1da177e4c Linux-2.6.12-rc2 |
1030 |
} |
fc14f2fef convert get_sb_si... |
1031 1032 1033 |
return dget(s->s_root); } EXPORT_SYMBOL(mount_single); |
9d412a43c vfs: split off vf... |
1034 1035 |
struct dentry * mount_fs(struct file_system_type *type, int flags, const char *name, void *data) |
1da177e4c Linux-2.6.12-rc2 |
1036 |
{ |
c96e41e92 beginning of tran... |
1037 |
struct dentry *root; |
9d412a43c vfs: split off vf... |
1038 |
struct super_block *sb; |
1da177e4c Linux-2.6.12-rc2 |
1039 |
char *secdata = NULL; |
9d412a43c vfs: split off vf... |
1040 |
int error = -ENOMEM; |
8089352a1 Mirror MS_KERNMOU... |
1041 |
|
e00075298 LSM/SELinux: Inte... |
1042 |
if (data && !(type->fs_flags & FS_BINARY_MOUNTDATA)) { |
1da177e4c Linux-2.6.12-rc2 |
1043 |
secdata = alloc_secdata(); |
454e2398b [PATCH] VFS: Perm... |
1044 |
if (!secdata) |
9d412a43c vfs: split off vf... |
1045 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1046 |
|
e00075298 LSM/SELinux: Inte... |
1047 |
error = security_sb_copy_data(data, secdata); |
454e2398b [PATCH] VFS: Perm... |
1048 |
if (error) |
1da177e4c Linux-2.6.12-rc2 |
1049 |
goto out_free_secdata; |
1da177e4c Linux-2.6.12-rc2 |
1050 |
} |
1a102ff92 vfs: bury ->get_sb() |
1051 1052 1053 1054 |
root = type->mount(type, flags, name, data); if (IS_ERR(root)) { error = PTR_ERR(root); goto out_free_secdata; |
c96e41e92 beginning of tran... |
1055 |
} |
9d412a43c vfs: split off vf... |
1056 1057 1058 |
sb = root->d_sb; BUG_ON(!sb); WARN_ON(!sb->s_bdi); |
6c5103890 Merge branch 'for... |
1059 |
WARN_ON(sb->s_bdi == &default_backing_dev_info); |
9d412a43c vfs: split off vf... |
1060 |
sb->s_flags |= MS_BORN; |
454e2398b [PATCH] VFS: Perm... |
1061 |
|
9d412a43c vfs: split off vf... |
1062 |
error = security_sb_kern_mount(sb, flags, secdata); |
5129a469a Catch filesystems... |
1063 1064 |
if (error) goto out_sb; |
454e2398b [PATCH] VFS: Perm... |
1065 |
|
42cb56ae2 vfs: change sb->s... |
1066 1067 1068 1069 |
/* * 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 |
4358b5678 VFS: trivial: fix... |
1070 |
* violate this rule. |
42cb56ae2 vfs: change sb->s... |
1071 |
*/ |
9d412a43c vfs: split off vf... |
1072 1073 1074 |
WARN((sb->s_maxbytes < 0), "%s set sb->s_maxbytes to " "negative value (%lld) ", type->name, sb->s_maxbytes); |
42cb56ae2 vfs: change sb->s... |
1075 |
|
9d412a43c vfs: split off vf... |
1076 |
up_write(&sb->s_umount); |
8680e22f2 [PATCH] VFS: memo... |
1077 |
free_secdata(secdata); |
9d412a43c vfs: split off vf... |
1078 |
return root; |
1da177e4c Linux-2.6.12-rc2 |
1079 |
out_sb: |
9d412a43c vfs: split off vf... |
1080 1081 |
dput(root); deactivate_locked_super(sb); |
1da177e4c Linux-2.6.12-rc2 |
1082 1083 |
out_free_secdata: free_secdata(secdata); |
1da177e4c Linux-2.6.12-rc2 |
1084 |
out: |
454e2398b [PATCH] VFS: Perm... |
1085 |
return ERR_PTR(error); |
1da177e4c Linux-2.6.12-rc2 |
1086 |
} |
18e9e5104 Introduce freeze_... |
1087 |
/** |
7000d3c42 fs/super: fix ker... |
1088 1089 |
* freeze_super - lock the filesystem and force it into a consistent state * @sb: the super to lock |
18e9e5104 Introduce freeze_... |
1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 |
* * 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); |