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fs/libfs.c
30.4 KB
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/* * fs/libfs.c * Library for filesystems writers. */ |
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#include <linux/blkdev.h> |
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#include <linux/export.h> |
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#include <linux/pagemap.h> |
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#include <linux/slab.h> |
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#include <linux/mount.h> #include <linux/vfs.h> |
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#include <linux/quotaops.h> |
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#include <linux/mutex.h> |
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#include <linux/namei.h> |
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#include <linux/exportfs.h> |
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#include <linux/writeback.h> |
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#include <linux/buffer_head.h> /* sync_mapping_buffers */ |
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|
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#include <asm/uaccess.h> |
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#include "internal.h" |
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int simple_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) { |
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struct inode *inode = d_inode(dentry); |
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generic_fillattr(inode, stat); stat->blocks = inode->i_mapping->nrpages << (PAGE_CACHE_SHIFT - 9); return 0; } |
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EXPORT_SYMBOL(simple_getattr); |
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|
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int simple_statfs(struct dentry *dentry, struct kstatfs *buf) |
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{ |
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buf->f_type = dentry->d_sb->s_magic; |
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buf->f_bsize = PAGE_CACHE_SIZE; buf->f_namelen = NAME_MAX; return 0; } |
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EXPORT_SYMBOL(simple_statfs); |
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/* * Retaining negative dentries for an in-memory filesystem just wastes * memory and lookup time: arrange for them to be deleted immediately. */ |
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int always_delete_dentry(const struct dentry *dentry) |
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{ return 1; } |
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EXPORT_SYMBOL(always_delete_dentry); const struct dentry_operations simple_dentry_operations = { .d_delete = always_delete_dentry, }; EXPORT_SYMBOL(simple_dentry_operations); |
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/* * Lookup the data. This is trivial - if the dentry didn't already * exist, we know it is negative. Set d_op to delete negative dentries. */ |
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struct dentry *simple_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
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{ |
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if (dentry->d_name.len > NAME_MAX) return ERR_PTR(-ENAMETOOLONG); |
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if (!dentry->d_sb->s_d_op) d_set_d_op(dentry, &simple_dentry_operations); |
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d_add(dentry, NULL); return NULL; } |
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EXPORT_SYMBOL(simple_lookup); |
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|
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int dcache_dir_open(struct inode *inode, struct file *file) { |
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static struct qstr cursor_name = QSTR_INIT(".", 1); |
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|
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file->private_data = d_alloc(file->f_path.dentry, &cursor_name); |
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return file->private_data ? 0 : -ENOMEM; } |
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EXPORT_SYMBOL(dcache_dir_open); |
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int dcache_dir_close(struct inode *inode, struct file *file) { dput(file->private_data); return 0; } |
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EXPORT_SYMBOL(dcache_dir_close); |
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|
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loff_t dcache_dir_lseek(struct file *file, loff_t offset, int whence) |
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{ |
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struct dentry *dentry = file->f_path.dentry; |
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mutex_lock(&d_inode(dentry)->i_mutex); |
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switch (whence) { |
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case 1: offset += file->f_pos; case 0: if (offset >= 0) break; default: |
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mutex_unlock(&d_inode(dentry)->i_mutex); |
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return -EINVAL; } if (offset != file->f_pos) { file->f_pos = offset; if (file->f_pos >= 2) { struct list_head *p; struct dentry *cursor = file->private_data; loff_t n = file->f_pos - 2; |
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spin_lock(&dentry->d_lock); /* d_lock not required for cursor */ |
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list_del(&cursor->d_child); |
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p = dentry->d_subdirs.next; while (n && p != &dentry->d_subdirs) { |
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struct dentry *next; |
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next = list_entry(p, struct dentry, d_child); |
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spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED); |
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if (simple_positive(next)) |
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n--; |
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spin_unlock(&next->d_lock); |
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p = p->next; } |
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list_add_tail(&cursor->d_child, p); |
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spin_unlock(&dentry->d_lock); |
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} } |
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mutex_unlock(&d_inode(dentry)->i_mutex); |
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return offset; } |
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EXPORT_SYMBOL(dcache_dir_lseek); |
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/* Relationship between i_mode and the DT_xxx types */ static inline unsigned char dt_type(struct inode *inode) { return (inode->i_mode >> 12) & 15; } /* * Directory is locked and all positive dentries in it are safe, since * for ramfs-type trees they can't go away without unlink() or rmdir(), * both impossible due to the lock on directory. */ |
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int dcache_readdir(struct file *file, struct dir_context *ctx) |
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{ |
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struct dentry *dentry = file->f_path.dentry; struct dentry *cursor = file->private_data; |
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struct list_head *p, *q = &cursor->d_child; |
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|
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if (!dir_emit_dots(file, ctx)) return 0; spin_lock(&dentry->d_lock); if (ctx->pos == 2) list_move(q, &dentry->d_subdirs); for (p = q->next; p != &dentry->d_subdirs; p = p->next) { |
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struct dentry *next = list_entry(p, struct dentry, d_child); |
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spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED); if (!simple_positive(next)) { spin_unlock(&next->d_lock); continue; } |
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|
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spin_unlock(&next->d_lock); spin_unlock(&dentry->d_lock); if (!dir_emit(ctx, next->d_name.name, next->d_name.len, |
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d_inode(next)->i_ino, dt_type(d_inode(next)))) |
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return 0; spin_lock(&dentry->d_lock); spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED); /* next is still alive */ list_move(q, p); spin_unlock(&next->d_lock); p = q; ctx->pos++; |
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} |
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spin_unlock(&dentry->d_lock); |
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return 0; } |
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EXPORT_SYMBOL(dcache_readdir); |
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ssize_t generic_read_dir(struct file *filp, char __user *buf, size_t siz, loff_t *ppos) { return -EISDIR; } |
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EXPORT_SYMBOL(generic_read_dir); |
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|
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const struct file_operations simple_dir_operations = { |
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.open = dcache_dir_open, .release = dcache_dir_close, .llseek = dcache_dir_lseek, .read = generic_read_dir, |
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.iterate = dcache_readdir, |
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.fsync = noop_fsync, |
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}; |
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EXPORT_SYMBOL(simple_dir_operations); |
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|
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const struct inode_operations simple_dir_inode_operations = { |
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.lookup = simple_lookup, }; |
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EXPORT_SYMBOL(simple_dir_inode_operations); |
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|
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static const struct super_operations simple_super_operations = { .statfs = simple_statfs, }; |
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/* * Common helper for pseudo-filesystems (sockfs, pipefs, bdev - stuff that * will never be mountable) */ |
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struct dentry *mount_pseudo(struct file_system_type *fs_type, char *name, |
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const struct super_operations *ops, const struct dentry_operations *dops, unsigned long magic) |
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{ |
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struct super_block *s; |
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struct dentry *dentry; struct inode *root; |
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struct qstr d_name = QSTR_INIT(name, strlen(name)); |
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|
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s = sget(fs_type, NULL, set_anon_super, MS_NOUSER, NULL); |
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if (IS_ERR(s)) |
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return ERR_CAST(s); |
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|
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s->s_maxbytes = MAX_LFS_FILESIZE; |
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s->s_blocksize = PAGE_SIZE; s->s_blocksize_bits = PAGE_SHIFT; |
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s->s_magic = magic; |
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s->s_op = ops ? ops : &simple_super_operations; |
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s->s_time_gran = 1; root = new_inode(s); if (!root) goto Enomem; |
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/* * since this is the first inode, make it number 1. New inodes created * after this must take care not to collide with it (by passing * max_reserved of 1 to iunique). */ root->i_ino = 1; |
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root->i_mode = S_IFDIR | S_IRUSR | S_IWUSR; |
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root->i_atime = root->i_mtime = root->i_ctime = CURRENT_TIME; |
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dentry = __d_alloc(s, &d_name); |
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if (!dentry) { iput(root); goto Enomem; } |
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d_instantiate(dentry, root); s->s_root = dentry; |
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s->s_d_op = dops; |
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s->s_flags |= MS_ACTIVE; |
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return dget(s->s_root); |
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Enomem: |
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deactivate_locked_super(s); |
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return ERR_PTR(-ENOMEM); |
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} |
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EXPORT_SYMBOL(mount_pseudo); |
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|
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int simple_open(struct inode *inode, struct file *file) { if (inode->i_private) file->private_data = inode->i_private; return 0; } |
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EXPORT_SYMBOL(simple_open); |
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|
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int simple_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) { |
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struct inode *inode = d_inode(old_dentry); |
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inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME; |
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inc_nlink(inode); |
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ihold(inode); |
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dget(dentry); d_instantiate(dentry, inode); return 0; } |
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EXPORT_SYMBOL(simple_link); |
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|
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int simple_empty(struct dentry *dentry) { struct dentry *child; int ret = 0; |
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spin_lock(&dentry->d_lock); |
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list_for_each_entry(child, &dentry->d_subdirs, d_child) { |
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spin_lock_nested(&child->d_lock, DENTRY_D_LOCK_NESTED); if (simple_positive(child)) { spin_unlock(&child->d_lock); |
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goto out; |
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} spin_unlock(&child->d_lock); } |
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ret = 1; out: |
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spin_unlock(&dentry->d_lock); |
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return ret; } |
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EXPORT_SYMBOL(simple_empty); |
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int simple_unlink(struct inode *dir, struct dentry *dentry) { |
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struct inode *inode = d_inode(dentry); |
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inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME; |
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drop_nlink(inode); |
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dput(dentry); return 0; } |
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EXPORT_SYMBOL(simple_unlink); |
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int simple_rmdir(struct inode *dir, struct dentry *dentry) { if (!simple_empty(dentry)) return -ENOTEMPTY; |
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drop_nlink(d_inode(dentry)); |
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simple_unlink(dir, dentry); |
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drop_nlink(dir); |
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return 0; } |
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EXPORT_SYMBOL(simple_rmdir); |
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int simple_rename(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry) { |
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struct inode *inode = d_inode(old_dentry); |
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int they_are_dirs = d_is_dir(old_dentry); |
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if (!simple_empty(new_dentry)) return -ENOTEMPTY; |
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if (d_really_is_positive(new_dentry)) { |
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simple_unlink(new_dir, new_dentry); |
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if (they_are_dirs) { |
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drop_nlink(d_inode(new_dentry)); |
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drop_nlink(old_dir); |
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} |
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} else if (they_are_dirs) { |
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drop_nlink(old_dir); |
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inc_nlink(new_dir); |
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} old_dir->i_ctime = old_dir->i_mtime = new_dir->i_ctime = new_dir->i_mtime = inode->i_ctime = CURRENT_TIME; return 0; } |
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EXPORT_SYMBOL(simple_rename); |
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|
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/** |
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* simple_setattr - setattr for simple filesystem |
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* @dentry: dentry * @iattr: iattr structure * * Returns 0 on success, -error on failure. * |
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* simple_setattr is a simple ->setattr implementation without a proper * implementation of size changes. * * It can either be used for in-memory filesystems or special files * on simple regular filesystems. Anything that needs to change on-disk * or wire state on size changes needs its own setattr method. |
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*/ int simple_setattr(struct dentry *dentry, struct iattr *iattr) { |
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struct inode *inode = d_inode(dentry); |
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int error; error = inode_change_ok(inode, iattr); if (error) return error; |
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if (iattr->ia_valid & ATTR_SIZE) truncate_setsize(inode, iattr->ia_size); |
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setattr_copy(inode, iattr); |
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mark_inode_dirty(inode); return 0; |
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} EXPORT_SYMBOL(simple_setattr); |
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int simple_readpage(struct file *file, struct page *page) { |
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clear_highpage(page); |
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flush_dcache_page(page); SetPageUptodate(page); |
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unlock_page(page); return 0; } |
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EXPORT_SYMBOL(simple_readpage); |
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|
afddba49d fs: introduce wri... |
380 381 382 383 384 385 |
int simple_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata) { struct page *page; pgoff_t index; |
afddba49d fs: introduce wri... |
386 387 |
index = pos >> PAGE_CACHE_SHIFT; |
afddba49d fs: introduce wri... |
388 |
|
54566b2c1 fs: symlink write... |
389 |
page = grab_cache_page_write_begin(mapping, index, flags); |
afddba49d fs: introduce wri... |
390 391 392 393 |
if (!page) return -ENOMEM; *pagep = page; |
193cf4b99 libfs: Unexport a... |
394 395 396 397 398 399 |
if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) { unsigned from = pos & (PAGE_CACHE_SIZE - 1); zero_user_segments(page, 0, from, from + len, PAGE_CACHE_SIZE); } return 0; |
afddba49d fs: introduce wri... |
400 |
} |
12f388722 libfs: get export... |
401 |
EXPORT_SYMBOL(simple_write_begin); |
afddba49d fs: introduce wri... |
402 |
|
ad2a722f1 libfs: Open code ... |
403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 |
/** * simple_write_end - .write_end helper for non-block-device FSes * @available: See .write_end of address_space_operations * @file: " * @mapping: " * @pos: " * @len: " * @copied: " * @page: " * @fsdata: " * * simple_write_end does the minimum needed for updating a page after writing is * done. It has the same API signature as the .write_end of * address_space_operations vector. So it can just be set onto .write_end for * FSes that don't need any other processing. i_mutex is assumed to be held. * Block based filesystems should use generic_write_end(). * NOTE: Even though i_size might get updated by this function, mark_inode_dirty * is not called, so a filesystem that actually does store data in .write_inode * should extend on what's done here with a call to mark_inode_dirty() in the * case that i_size has changed. */ |
afddba49d fs: introduce wri... |
424 425 426 427 |
int simple_write_end(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata) { |
ad2a722f1 libfs: Open code ... |
428 429 |
struct inode *inode = page->mapping->host; loff_t last_pos = pos + copied; |
afddba49d fs: introduce wri... |
430 431 432 |
/* zero the stale part of the page if we did a short copy */ if (copied < len) { |
ad2a722f1 libfs: Open code ... |
433 434 435 |
unsigned from = pos & (PAGE_CACHE_SIZE - 1); zero_user(page, from + copied, len - copied); |
afddba49d fs: introduce wri... |
436 |
} |
ad2a722f1 libfs: Open code ... |
437 438 439 440 441 442 443 444 |
if (!PageUptodate(page)) SetPageUptodate(page); /* * No need to use i_size_read() here, the i_size * cannot change under us because we hold the i_mutex. */ if (last_pos > inode->i_size) i_size_write(inode, last_pos); |
afddba49d fs: introduce wri... |
445 |
|
ad2a722f1 libfs: Open code ... |
446 |
set_page_dirty(page); |
afddba49d fs: introduce wri... |
447 448 449 450 451 |
unlock_page(page); page_cache_release(page); return copied; } |
12f388722 libfs: get export... |
452 |
EXPORT_SYMBOL(simple_write_end); |
afddba49d fs: introduce wri... |
453 |
|
1a1c9bb43 inode numbering: ... |
454 455 456 457 458 |
/* * the inodes created here are not hashed. If you use iunique to generate * unique inode values later for this filesystem, then you must take care * to pass it an appropriate max_reserved value to avoid collisions. */ |
7d683a099 wrong type for 'm... |
459 460 |
int simple_fill_super(struct super_block *s, unsigned long magic, struct tree_descr *files) |
1da177e4c Linux-2.6.12-rc2 |
461 |
{ |
1da177e4c Linux-2.6.12-rc2 |
462 463 464 465 466 467 468 469 |
struct inode *inode; struct dentry *root; struct dentry *dentry; int i; s->s_blocksize = PAGE_CACHE_SIZE; s->s_blocksize_bits = PAGE_CACHE_SHIFT; s->s_magic = magic; |
759b9775c [PATCH] shmem and... |
470 |
s->s_op = &simple_super_operations; |
1da177e4c Linux-2.6.12-rc2 |
471 472 473 474 475 |
s->s_time_gran = 1; inode = new_inode(s); if (!inode) return -ENOMEM; |
1a1c9bb43 inode numbering: ... |
476 477 478 479 480 |
/* * because the root inode is 1, the files array must not contain an * entry at index 1 */ inode->i_ino = 1; |
1da177e4c Linux-2.6.12-rc2 |
481 |
inode->i_mode = S_IFDIR | 0755; |
1da177e4c Linux-2.6.12-rc2 |
482 483 484 |
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; inode->i_op = &simple_dir_inode_operations; inode->i_fop = &simple_dir_operations; |
bfe868486 filesystems: add ... |
485 |
set_nlink(inode, 2); |
48fde701a switch open-coded... |
486 487 |
root = d_make_root(inode); if (!root) |
1da177e4c Linux-2.6.12-rc2 |
488 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
489 490 491 |
for (i = 0; !files->name || files->name[0]; i++, files++) { if (!files->name) continue; |
1a1c9bb43 inode numbering: ... |
492 493 494 495 496 497 498 |
/* warn if it tries to conflict with the root inode */ if (unlikely(i == 1)) printk(KERN_WARNING "%s: %s passed in a files array" "with an index of 1! ", __func__, s->s_type->name); |
1da177e4c Linux-2.6.12-rc2 |
499 500 501 502 |
dentry = d_alloc_name(root, files->name); if (!dentry) goto out; inode = new_inode(s); |
32096ea1a vfs: fix dentry l... |
503 504 |
if (!inode) { dput(dentry); |
1da177e4c Linux-2.6.12-rc2 |
505 |
goto out; |
32096ea1a vfs: fix dentry l... |
506 |
} |
1da177e4c Linux-2.6.12-rc2 |
507 |
inode->i_mode = S_IFREG | files->mode; |
1da177e4c Linux-2.6.12-rc2 |
508 509 510 511 512 513 514 515 516 |
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; inode->i_fop = files->ops; inode->i_ino = i; d_add(dentry, inode); } s->s_root = root; return 0; out: d_genocide(root); |
640946f20 dentry leak in si... |
517 |
shrink_dcache_parent(root); |
1da177e4c Linux-2.6.12-rc2 |
518 519 520 |
dput(root); return -ENOMEM; } |
12f388722 libfs: get export... |
521 |
EXPORT_SYMBOL(simple_fill_super); |
1da177e4c Linux-2.6.12-rc2 |
522 523 |
static DEFINE_SPINLOCK(pin_fs_lock); |
1f5ce9e93 VFS: Unexport do_... |
524 |
int simple_pin_fs(struct file_system_type *type, struct vfsmount **mount, int *count) |
1da177e4c Linux-2.6.12-rc2 |
525 526 527 528 529 |
{ struct vfsmount *mnt = NULL; spin_lock(&pin_fs_lock); if (unlikely(!*mount)) { spin_unlock(&pin_fs_lock); |
2452992aa make simple_pin_f... |
530 |
mnt = vfs_kern_mount(type, MS_KERNMOUNT, type->name, NULL); |
1da177e4c Linux-2.6.12-rc2 |
531 532 533 534 535 536 537 538 539 540 541 542 |
if (IS_ERR(mnt)) return PTR_ERR(mnt); spin_lock(&pin_fs_lock); if (!*mount) *mount = mnt; } mntget(*mount); ++*count; spin_unlock(&pin_fs_lock); mntput(mnt); return 0; } |
12f388722 libfs: get export... |
543 |
EXPORT_SYMBOL(simple_pin_fs); |
1da177e4c Linux-2.6.12-rc2 |
544 545 546 547 548 549 550 551 552 553 554 |
void simple_release_fs(struct vfsmount **mount, int *count) { struct vfsmount *mnt; spin_lock(&pin_fs_lock); mnt = *mount; if (!--*count) *mount = NULL; spin_unlock(&pin_fs_lock); mntput(mnt); } |
12f388722 libfs: get export... |
555 |
EXPORT_SYMBOL(simple_release_fs); |
1da177e4c Linux-2.6.12-rc2 |
556 |
|
6d1029b56 add kernel-doc fo... |
557 558 559 560 561 562 563 564 565 566 567 568 569 570 |
/** * simple_read_from_buffer - copy data from the buffer to user space * @to: the user space buffer to read to * @count: the maximum number of bytes to read * @ppos: the current position in the buffer * @from: the buffer to read from * @available: the size of the buffer * * The simple_read_from_buffer() function reads up to @count bytes from the * buffer @from at offset @ppos into the user space address starting at @to. * * On success, the number of bytes read is returned and the offset @ppos is * advanced by this number, or negative value is returned on error. **/ |
1da177e4c Linux-2.6.12-rc2 |
571 572 573 574 |
ssize_t simple_read_from_buffer(void __user *to, size_t count, loff_t *ppos, const void *from, size_t available) { loff_t pos = *ppos; |
14be27460 libfs: make simpl... |
575 |
size_t ret; |
1da177e4c Linux-2.6.12-rc2 |
576 577 |
if (pos < 0) return -EINVAL; |
14be27460 libfs: make simpl... |
578 |
if (pos >= available || !count) |
1da177e4c Linux-2.6.12-rc2 |
579 580 581 |
return 0; if (count > available - pos) count = available - pos; |
14be27460 libfs: make simpl... |
582 583 |
ret = copy_to_user(to, from + pos, count); if (ret == count) |
1da177e4c Linux-2.6.12-rc2 |
584 |
return -EFAULT; |
14be27460 libfs: make simpl... |
585 |
count -= ret; |
1da177e4c Linux-2.6.12-rc2 |
586 587 588 |
*ppos = pos + count; return count; } |
12f388722 libfs: get export... |
589 |
EXPORT_SYMBOL(simple_read_from_buffer); |
1da177e4c Linux-2.6.12-rc2 |
590 |
|
6d1029b56 add kernel-doc fo... |
591 |
/** |
6a727b43b FS / libfs: Imple... |
592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 |
* simple_write_to_buffer - copy data from user space to the buffer * @to: the buffer to write to * @available: the size of the buffer * @ppos: the current position in the buffer * @from: the user space buffer to read from * @count: the maximum number of bytes to read * * The simple_write_to_buffer() function reads up to @count bytes from the user * space address starting at @from into the buffer @to at offset @ppos. * * On success, the number of bytes written is returned and the offset @ppos is * advanced by this number, or negative value is returned on error. **/ ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos, const void __user *from, size_t count) { loff_t pos = *ppos; size_t res; if (pos < 0) return -EINVAL; if (pos >= available || !count) return 0; if (count > available - pos) count = available - pos; res = copy_from_user(to + pos, from, count); if (res == count) return -EFAULT; count -= res; *ppos = pos + count; return count; } |
12f388722 libfs: get export... |
624 |
EXPORT_SYMBOL(simple_write_to_buffer); |
6a727b43b FS / libfs: Imple... |
625 626 |
/** |
6d1029b56 add kernel-doc fo... |
627 628 629 630 631 632 633 634 635 636 637 638 639 |
* memory_read_from_buffer - copy data from the buffer * @to: the kernel space buffer to read to * @count: the maximum number of bytes to read * @ppos: the current position in the buffer * @from: the buffer to read from * @available: the size of the buffer * * The memory_read_from_buffer() function reads up to @count bytes from the * buffer @from at offset @ppos into the kernel space address starting at @to. * * On success, the number of bytes read is returned and the offset @ppos is * advanced by this number, or negative value is returned on error. **/ |
93b071139 introduce memory_... |
640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 |
ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos, const void *from, size_t available) { loff_t pos = *ppos; if (pos < 0) return -EINVAL; if (pos >= available) return 0; if (count > available - pos) count = available - pos; memcpy(to, from + pos, count); *ppos = pos + count; return count; } |
12f388722 libfs: get export... |
656 |
EXPORT_SYMBOL(memory_read_from_buffer); |
93b071139 introduce memory_... |
657 |
|
1da177e4c Linux-2.6.12-rc2 |
658 659 660 661 662 663 |
/* * Transaction based IO. * The file expects a single write which triggers the transaction, and then * possibly a read which collects the result - which is stored in a * file-local buffer. */ |
76791ab2d kmemtrace, fs: un... |
664 665 666 667 668 669 670 671 672 673 674 675 676 677 |
void simple_transaction_set(struct file *file, size_t n) { struct simple_transaction_argresp *ar = file->private_data; BUG_ON(n > SIMPLE_TRANSACTION_LIMIT); /* * The barrier ensures that ar->size will really remain zero until * ar->data is ready for reading. */ smp_mb(); ar->size = n; } |
12f388722 libfs: get export... |
678 |
EXPORT_SYMBOL(simple_transaction_set); |
76791ab2d kmemtrace, fs: un... |
679 |
|
1da177e4c Linux-2.6.12-rc2 |
680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 |
char *simple_transaction_get(struct file *file, const char __user *buf, size_t size) { struct simple_transaction_argresp *ar; static DEFINE_SPINLOCK(simple_transaction_lock); if (size > SIMPLE_TRANSACTION_LIMIT - 1) return ERR_PTR(-EFBIG); ar = (struct simple_transaction_argresp *)get_zeroed_page(GFP_KERNEL); if (!ar) return ERR_PTR(-ENOMEM); spin_lock(&simple_transaction_lock); /* only one write allowed per open */ if (file->private_data) { spin_unlock(&simple_transaction_lock); free_page((unsigned long)ar); return ERR_PTR(-EBUSY); } file->private_data = ar; spin_unlock(&simple_transaction_lock); if (copy_from_user(ar->data, buf, size)) return ERR_PTR(-EFAULT); return ar->data; } |
12f388722 libfs: get export... |
710 |
EXPORT_SYMBOL(simple_transaction_get); |
1da177e4c Linux-2.6.12-rc2 |
711 712 713 714 715 716 717 718 719 |
ssize_t simple_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos) { struct simple_transaction_argresp *ar = file->private_data; if (!ar) return 0; return simple_read_from_buffer(buf, size, pos, ar->data, ar->size); } |
12f388722 libfs: get export... |
720 |
EXPORT_SYMBOL(simple_transaction_read); |
1da177e4c Linux-2.6.12-rc2 |
721 722 723 724 725 726 |
int simple_transaction_release(struct inode *inode, struct file *file) { free_page((unsigned long)file->private_data); return 0; } |
12f388722 libfs: get export... |
727 |
EXPORT_SYMBOL(simple_transaction_release); |
1da177e4c Linux-2.6.12-rc2 |
728 |
|
acaefc25d [PATCH] libfs: ad... |
729 730 731 |
/* Simple attribute files */ struct simple_attr { |
8b88b0998 libfs: allow erro... |
732 733 |
int (*get)(void *, u64 *); int (*set)(void *, u64); |
acaefc25d [PATCH] libfs: ad... |
734 735 736 737 738 |
char get_buf[24]; /* enough to store a u64 and " \0" */ char set_buf[24]; void *data; const char *fmt; /* format for read operation */ |
7cf34c761 [PATCH] sem2mutex... |
739 |
struct mutex mutex; /* protects access to these buffers */ |
acaefc25d [PATCH] libfs: ad... |
740 741 742 743 744 |
}; /* simple_attr_open is called by an actual attribute open file operation * to set the attribute specific access operations. */ int simple_attr_open(struct inode *inode, struct file *file, |
8b88b0998 libfs: allow erro... |
745 |
int (*get)(void *, u64 *), int (*set)(void *, u64), |
acaefc25d [PATCH] libfs: ad... |
746 747 748 749 750 751 752 753 754 755 |
const char *fmt) { struct simple_attr *attr; attr = kmalloc(sizeof(*attr), GFP_KERNEL); if (!attr) return -ENOMEM; attr->get = get; attr->set = set; |
8e18e2941 [PATCH] inode_die... |
756 |
attr->data = inode->i_private; |
acaefc25d [PATCH] libfs: ad... |
757 |
attr->fmt = fmt; |
7cf34c761 [PATCH] sem2mutex... |
758 |
mutex_init(&attr->mutex); |
acaefc25d [PATCH] libfs: ad... |
759 760 761 762 763 |
file->private_data = attr; return nonseekable_open(inode, file); } |
12f388722 libfs: get export... |
764 |
EXPORT_SYMBOL_GPL(simple_attr_open); |
acaefc25d [PATCH] libfs: ad... |
765 |
|
74bedc4d5 libfs: rename sim... |
766 |
int simple_attr_release(struct inode *inode, struct file *file) |
acaefc25d [PATCH] libfs: ad... |
767 768 769 770 |
{ kfree(file->private_data); return 0; } |
12f388722 libfs: get export... |
771 |
EXPORT_SYMBOL_GPL(simple_attr_release); /* GPL-only? This? Really? */ |
acaefc25d [PATCH] libfs: ad... |
772 773 774 775 776 777 778 779 780 781 782 783 784 |
/* read from the buffer that is filled with the get function */ ssize_t simple_attr_read(struct file *file, char __user *buf, size_t len, loff_t *ppos) { struct simple_attr *attr; size_t size; ssize_t ret; attr = file->private_data; if (!attr->get) return -EACCES; |
9261303ab libfs: make simpl... |
785 786 787 |
ret = mutex_lock_interruptible(&attr->mutex); if (ret) return ret; |
8b88b0998 libfs: allow erro... |
788 |
if (*ppos) { /* continued read */ |
acaefc25d [PATCH] libfs: ad... |
789 |
size = strlen(attr->get_buf); |
8b88b0998 libfs: allow erro... |
790 791 792 793 794 |
} else { /* first read */ u64 val; ret = attr->get(attr->data, &val); if (ret) goto out; |
acaefc25d [PATCH] libfs: ad... |
795 |
size = scnprintf(attr->get_buf, sizeof(attr->get_buf), |
8b88b0998 libfs: allow erro... |
796 797 |
attr->fmt, (unsigned long long)val); } |
acaefc25d [PATCH] libfs: ad... |
798 799 |
ret = simple_read_from_buffer(buf, len, ppos, attr->get_buf, size); |
8b88b0998 libfs: allow erro... |
800 |
out: |
7cf34c761 [PATCH] sem2mutex... |
801 |
mutex_unlock(&attr->mutex); |
acaefc25d [PATCH] libfs: ad... |
802 803 |
return ret; } |
12f388722 libfs: get export... |
804 |
EXPORT_SYMBOL_GPL(simple_attr_read); |
acaefc25d [PATCH] libfs: ad... |
805 806 807 808 809 810 811 812 813 814 815 |
/* interpret the buffer as a number to call the set function with */ ssize_t simple_attr_write(struct file *file, const char __user *buf, size_t len, loff_t *ppos) { struct simple_attr *attr; u64 val; size_t size; ssize_t ret; attr = file->private_data; |
acaefc25d [PATCH] libfs: ad... |
816 817 |
if (!attr->set) return -EACCES; |
9261303ab libfs: make simpl... |
818 819 820 |
ret = mutex_lock_interruptible(&attr->mutex); if (ret) return ret; |
acaefc25d [PATCH] libfs: ad... |
821 822 823 824 |
ret = -EFAULT; size = min(sizeof(attr->set_buf) - 1, len); if (copy_from_user(attr->set_buf, buf, size)) goto out; |
acaefc25d [PATCH] libfs: ad... |
825 |
attr->set_buf[size] = '\0'; |
f7b88631a fs/libfs.c: fix s... |
826 |
val = simple_strtoll(attr->set_buf, NULL, 0); |
05cc0cee6 libfs: return err... |
827 828 829 |
ret = attr->set(attr->data, val); if (ret == 0) ret = len; /* on success, claim we got the whole input */ |
acaefc25d [PATCH] libfs: ad... |
830 |
out: |
7cf34c761 [PATCH] sem2mutex... |
831 |
mutex_unlock(&attr->mutex); |
acaefc25d [PATCH] libfs: ad... |
832 833 |
return ret; } |
12f388722 libfs: get export... |
834 |
EXPORT_SYMBOL_GPL(simple_attr_write); |
acaefc25d [PATCH] libfs: ad... |
835 |
|
2596110a3 exportfs: add new... |
836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 |
/** * generic_fh_to_dentry - generic helper for the fh_to_dentry export operation * @sb: filesystem to do the file handle conversion on * @fid: file handle to convert * @fh_len: length of the file handle in bytes * @fh_type: type of file handle * @get_inode: filesystem callback to retrieve inode * * This function decodes @fid as long as it has one of the well-known * Linux filehandle types and calls @get_inode on it to retrieve the * inode for the object specified in the file handle. */ struct dentry *generic_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type, struct inode *(*get_inode) (struct super_block *sb, u64 ino, u32 gen)) { struct inode *inode = NULL; if (fh_len < 2) return NULL; switch (fh_type) { case FILEID_INO32_GEN: case FILEID_INO32_GEN_PARENT: inode = get_inode(sb, fid->i32.ino, fid->i32.gen); break; } |
4ea3ada29 [PATCH] new helpe... |
863 |
return d_obtain_alias(inode); |
2596110a3 exportfs: add new... |
864 865 866 867 |
} EXPORT_SYMBOL_GPL(generic_fh_to_dentry); /** |
ca1868309 vfs: fix kerneldo... |
868 |
* generic_fh_to_parent - generic helper for the fh_to_parent export operation |
2596110a3 exportfs: add new... |
869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 |
* @sb: filesystem to do the file handle conversion on * @fid: file handle to convert * @fh_len: length of the file handle in bytes * @fh_type: type of file handle * @get_inode: filesystem callback to retrieve inode * * This function decodes @fid as long as it has one of the well-known * Linux filehandle types and calls @get_inode on it to retrieve the * inode for the _parent_ object specified in the file handle if it * is specified in the file handle, or NULL otherwise. */ struct dentry *generic_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, int fh_type, struct inode *(*get_inode) (struct super_block *sb, u64 ino, u32 gen)) { struct inode *inode = NULL; if (fh_len <= 2) return NULL; switch (fh_type) { case FILEID_INO32_GEN_PARENT: inode = get_inode(sb, fid->i32.parent_ino, (fh_len > 3 ? fid->i32.parent_gen : 0)); break; } |
4ea3ada29 [PATCH] new helpe... |
895 |
return d_obtain_alias(inode); |
2596110a3 exportfs: add new... |
896 897 |
} EXPORT_SYMBOL_GPL(generic_fh_to_parent); |
1b061d924 rename the generi... |
898 |
/** |
ac13a829f fs/libfs.c: add g... |
899 900 |
* __generic_file_fsync - generic fsync implementation for simple filesystems * |
1b061d924 rename the generi... |
901 |
* @file: file to synchronize |
ac13a829f fs/libfs.c: add g... |
902 903 |
* @start: start offset in bytes * @end: end offset in bytes (inclusive) |
1b061d924 rename the generi... |
904 905 906 907 908 909 |
* @datasync: only synchronize essential metadata if true * * This is a generic implementation of the fsync method for simple * filesystems which track all non-inode metadata in the buffers list * hanging off the address_space structure. */ |
ac13a829f fs/libfs.c: add g... |
910 911 |
int __generic_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
d5aacad54 New helper - simp... |
912 |
{ |
7ea808591 drop unused dentr... |
913 |
struct inode *inode = file->f_mapping->host; |
d5aacad54 New helper - simp... |
914 915 |
int err; int ret; |
02c24a821 fs: push i_mutex ... |
916 917 918 919 920 |
err = filemap_write_and_wait_range(inode->i_mapping, start, end); if (err) return err; mutex_lock(&inode->i_mutex); |
d5aacad54 New helper - simp... |
921 |
ret = sync_mapping_buffers(inode->i_mapping); |
0ae45f63d vfs: add support ... |
922 |
if (!(inode->i_state & I_DIRTY_ALL)) |
02c24a821 fs: push i_mutex ... |
923 |
goto out; |
d5aacad54 New helper - simp... |
924 |
if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) |
02c24a821 fs: push i_mutex ... |
925 |
goto out; |
d5aacad54 New helper - simp... |
926 |
|
c37650161 fs: add sync_inod... |
927 |
err = sync_inode_metadata(inode, 1); |
d5aacad54 New helper - simp... |
928 929 |
if (ret == 0) ret = err; |
ac13a829f fs/libfs.c: add g... |
930 |
|
02c24a821 fs: push i_mutex ... |
931 932 |
out: mutex_unlock(&inode->i_mutex); |
d5aacad54 New helper - simp... |
933 934 |
return ret; } |
ac13a829f fs/libfs.c: add g... |
935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 |
EXPORT_SYMBOL(__generic_file_fsync); /** * generic_file_fsync - generic fsync implementation for simple filesystems * with flush * @file: file to synchronize * @start: start offset in bytes * @end: end offset in bytes (inclusive) * @datasync: only synchronize essential metadata if true * */ int generic_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) { struct inode *inode = file->f_mapping->host; int err; err = __generic_file_fsync(file, start, end, datasync); if (err) return err; return blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL); } |
1b061d924 rename the generi... |
958 |
EXPORT_SYMBOL(generic_file_fsync); |
30ca22c70 ext3/ext4: Factor... |
959 960 961 962 963 964 965 966 967 968 969 970 |
/** * generic_check_addressable - Check addressability of file system * @blocksize_bits: log of file system block size * @num_blocks: number of blocks in file system * * Determine whether a file system with @num_blocks blocks (and a * block size of 2**@blocksize_bits) is addressable by the sector_t * and page cache of the system. Return 0 if so and -EFBIG otherwise. */ int generic_check_addressable(unsigned blocksize_bits, u64 num_blocks) { u64 last_fs_block = num_blocks - 1; |
a33f13efe libfs: Fix shift ... |
971 972 |
u64 last_fs_page = last_fs_block >> (PAGE_CACHE_SHIFT - blocksize_bits); |
30ca22c70 ext3/ext4: Factor... |
973 974 975 976 977 978 |
if (unlikely(num_blocks == 0)) return 0; if ((blocksize_bits < 9) || (blocksize_bits > PAGE_CACHE_SHIFT)) return -EINVAL; |
a33f13efe libfs: Fix shift ... |
979 980 |
if ((last_fs_block > (sector_t)(~0ULL) >> (blocksize_bits - 9)) || (last_fs_page > (pgoff_t)(~0ULL))) { |
30ca22c70 ext3/ext4: Factor... |
981 982 983 984 985 |
return -EFBIG; } return 0; } EXPORT_SYMBOL(generic_check_addressable); |
1b061d924 rename the generi... |
986 987 988 |
/* * No-op implementation of ->fsync for in-memory filesystems. */ |
02c24a821 fs: push i_mutex ... |
989 |
int noop_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
1b061d924 rename the generi... |
990 991 992 |
{ return 0; } |
1b061d924 rename the generi... |
993 |
EXPORT_SYMBOL(noop_fsync); |
87dc800be new helper: kfree... |
994 |
|
5f2c4179e switch ->put_link... |
995 |
void kfree_put_link(struct inode *unused, void *cookie) |
87dc800be new helper: kfree... |
996 |
{ |
680baacbc new ->follow_link... |
997 |
kfree(cookie); |
87dc800be new helper: kfree... |
998 999 |
} EXPORT_SYMBOL(kfree_put_link); |
6987843ff take anon inode a... |
1000 |
|
ecc087ff1 new helper: free_... |
1001 1002 1003 1004 1005 |
void free_page_put_link(struct inode *unused, void *cookie) { free_page((unsigned long) cookie); } EXPORT_SYMBOL(free_page_put_link); |
6987843ff take anon inode a... |
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 |
/* * nop .set_page_dirty method so that people can use .page_mkwrite on * anon inodes. */ static int anon_set_page_dirty(struct page *page) { return 0; }; /* * A single inode exists for all anon_inode files. Contrary to pipes, * anon_inode inodes have no associated per-instance data, so we need * only allocate one of them. */ struct inode *alloc_anon_inode(struct super_block *s) { static const struct address_space_operations anon_aops = { .set_page_dirty = anon_set_page_dirty, }; struct inode *inode = new_inode_pseudo(s); if (!inode) return ERR_PTR(-ENOMEM); inode->i_ino = get_next_ino(); inode->i_mapping->a_ops = &anon_aops; /* * Mark the inode dirty from the very beginning, * that way it will never be moved to the dirty * list because mark_inode_dirty() will think * that it already _is_ on the dirty list. */ inode->i_state = I_DIRTY; inode->i_mode = S_IRUSR | S_IWUSR; inode->i_uid = current_fsuid(); inode->i_gid = current_fsgid(); inode->i_flags |= S_PRIVATE; inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; return inode; } EXPORT_SYMBOL(alloc_anon_inode); |
1c994a090 locks: consolidat... |
1048 1049 1050 1051 1052 1053 |
/** * simple_nosetlease - generic helper for prohibiting leases * @filp: file pointer * @arg: type of lease to obtain * @flp: new lease supplied for insertion |
e6f5c7893 locks: plumb a "p... |
1054 |
* @priv: private data for lm_setup operation |
1c994a090 locks: consolidat... |
1055 1056 1057 1058 1059 |
* * Generic helper for filesystems that do not wish to allow leases to be set. * All arguments are ignored and it just returns -EINVAL. */ int |
e6f5c7893 locks: plumb a "p... |
1060 1061 |
simple_nosetlease(struct file *filp, long arg, struct file_lock **flp, void **priv) |
1c994a090 locks: consolidat... |
1062 1063 1064 1065 |
{ return -EINVAL; } EXPORT_SYMBOL(simple_nosetlease); |
61ba64fc0 libfs: simple_fol... |
1066 |
|
6e77137b3 don't pass nameid... |
1067 |
const char *simple_follow_link(struct dentry *dentry, void **cookie) |
61ba64fc0 libfs: simple_fol... |
1068 |
{ |
680baacbc new ->follow_link... |
1069 |
return d_inode(dentry)->i_link; |
61ba64fc0 libfs: simple_fol... |
1070 1071 1072 1073 1074 1075 1076 1077 |
} EXPORT_SYMBOL(simple_follow_link); const struct inode_operations simple_symlink_inode_operations = { .follow_link = simple_follow_link, .readlink = generic_readlink }; EXPORT_SYMBOL(simple_symlink_inode_operations); |
fbabfd0f4 fs: Add helper fu... |
1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 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 |
/* * Operations for a permanently empty directory. */ static struct dentry *empty_dir_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) { return ERR_PTR(-ENOENT); } static int empty_dir_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) { struct inode *inode = d_inode(dentry); generic_fillattr(inode, stat); return 0; } static int empty_dir_setattr(struct dentry *dentry, struct iattr *attr) { return -EPERM; } static int empty_dir_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags) { return -EOPNOTSUPP; } static ssize_t empty_dir_getxattr(struct dentry *dentry, const char *name, void *value, size_t size) { return -EOPNOTSUPP; } static int empty_dir_removexattr(struct dentry *dentry, const char *name) { return -EOPNOTSUPP; } static ssize_t empty_dir_listxattr(struct dentry *dentry, char *list, size_t size) { return -EOPNOTSUPP; } static const struct inode_operations empty_dir_inode_operations = { .lookup = empty_dir_lookup, .permission = generic_permission, .setattr = empty_dir_setattr, .getattr = empty_dir_getattr, .setxattr = empty_dir_setxattr, .getxattr = empty_dir_getxattr, .removexattr = empty_dir_removexattr, .listxattr = empty_dir_listxattr, }; static loff_t empty_dir_llseek(struct file *file, loff_t offset, int whence) { /* An empty directory has two entries . and .. at offsets 0 and 1 */ return generic_file_llseek_size(file, offset, whence, 2, 2); } static int empty_dir_readdir(struct file *file, struct dir_context *ctx) { dir_emit_dots(file, ctx); return 0; } static const struct file_operations empty_dir_operations = { .llseek = empty_dir_llseek, .read = generic_read_dir, .iterate = empty_dir_readdir, .fsync = noop_fsync, }; void make_empty_dir_inode(struct inode *inode) { set_nlink(inode, 2); inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; inode->i_uid = GLOBAL_ROOT_UID; inode->i_gid = GLOBAL_ROOT_GID; inode->i_rdev = 0; |
4b75de861 fs: Set the size ... |
1160 |
inode->i_size = 0; |
fbabfd0f4 fs: Add helper fu... |
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 |
inode->i_blkbits = PAGE_SHIFT; inode->i_blocks = 0; inode->i_op = &empty_dir_inode_operations; inode->i_fop = &empty_dir_operations; } bool is_empty_dir_inode(struct inode *inode) { return (inode->i_fop == &empty_dir_operations) && (inode->i_op == &empty_dir_inode_operations); } |