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fs/libfs.c
32.9 KB
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// SPDX-License-Identifier: GPL-2.0-only |
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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/cred.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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#include <linux/fs_context.h> #include <linux/pseudo_fs.h> |
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|
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#include <linux/uaccess.h> |
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|
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#include "internal.h" |
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int simple_getattr(const struct path *path, struct kstat *stat, u32 request_mask, unsigned int query_flags) |
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{ |
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struct inode *inode = d_inode(path->dentry); |
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generic_fillattr(inode, stat); |
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stat->blocks = inode->i_mapping->nrpages << (PAGE_SHIFT - 9); |
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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_SIZE; |
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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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file->private_data = d_alloc_cursor(file->f_path.dentry); |
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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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/* parent is locked at least shared */ |
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/* * Returns an element of siblings' list. * We are looking for <count>th positive after <p>; if |
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* found, dentry is grabbed and returned to caller. * If no such element exists, NULL is returned. |
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*/ |
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static struct dentry *scan_positives(struct dentry *cursor, |
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struct list_head *p, loff_t count, |
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struct dentry *last) |
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{ |
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struct dentry *dentry = cursor->d_parent, *found = NULL; spin_lock(&dentry->d_lock); while ((p = p->next) != &dentry->d_subdirs) { |
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struct dentry *d = list_entry(p, struct dentry, d_child); |
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// we must at least skip cursors, to avoid livelocks if (d->d_flags & DCACHE_DENTRY_CURSOR) continue; if (simple_positive(d) && !--count) { spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED); if (simple_positive(d)) found = dget_dlock(d); spin_unlock(&d->d_lock); if (likely(found)) break; count = 1; } if (need_resched()) { list_move(&cursor->d_child, p); p = &cursor->d_child; spin_unlock(&dentry->d_lock); cond_resched(); spin_lock(&dentry->d_lock); |
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} } |
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spin_unlock(&dentry->d_lock); |
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dput(last); return found; |
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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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switch (whence) { |
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case 1: offset += file->f_pos; |
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/* fall through */ |
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case 0: if (offset >= 0) break; |
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/* fall through */ |
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default: |
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return -EINVAL; } if (offset != file->f_pos) { |
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struct dentry *cursor = file->private_data; struct dentry *to = NULL; |
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|
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inode_lock_shared(dentry->d_inode); |
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if (offset > 2) to = scan_positives(cursor, &dentry->d_subdirs, offset - 2, NULL); spin_lock(&dentry->d_lock); if (to) list_move(&cursor->d_child, &to->d_child); else |
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list_del_init(&cursor->d_child); |
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spin_unlock(&dentry->d_lock); |
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dput(to); |
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file->f_pos = offset; |
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inode_unlock_shared(dentry->d_inode); |
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} |
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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 *anchor = &dentry->d_subdirs; struct dentry *next = NULL; struct list_head *p; |
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|
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if (!dir_emit_dots(file, ctx)) return 0; |
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if (ctx->pos == 2) |
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p = anchor; |
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else if (!list_empty(&cursor->d_child)) |
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p = &cursor->d_child; |
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else return 0; |
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|
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while ((next = scan_positives(cursor, p, 1, next)) != NULL) { |
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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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break; |
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ctx->pos++; |
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p = &next->d_child; |
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} |
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spin_lock(&dentry->d_lock); |
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if (next) list_move_tail(&cursor->d_child, &next->d_child); else list_del_init(&cursor->d_child); |
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spin_unlock(&dentry->d_lock); dput(next); |
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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_shared = 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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static int pseudo_fs_fill_super(struct super_block *s, struct fs_context *fc) |
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{ |
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struct pseudo_fs_context *ctx = fc->fs_private; |
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struct inode *root; |
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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 = ctx->magic; s->s_op = ctx->ops ?: &simple_super_operations; s->s_xattr = ctx->xattr; |
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s->s_time_gran = 1; root = new_inode(s); if (!root) |
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return -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(root); |
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s->s_root = d_make_root(root); if (!s->s_root) |
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return -ENOMEM; |
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s->s_d_op = ctx->dops; |
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return 0; |
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} |
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|
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static int pseudo_fs_get_tree(struct fs_context *fc) { |
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return get_tree_nodev(fc, pseudo_fs_fill_super); |
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} static void pseudo_fs_free(struct fs_context *fc) { kfree(fc->fs_private); } static const struct fs_context_operations pseudo_fs_context_ops = { .free = pseudo_fs_free, .get_tree = pseudo_fs_get_tree, }; /* * Common helper for pseudo-filesystems (sockfs, pipefs, bdev - stuff that * will never be mountable) */ struct pseudo_fs_context *init_pseudo(struct fs_context *fc, unsigned long magic) { struct pseudo_fs_context *ctx; ctx = kzalloc(sizeof(struct pseudo_fs_context), GFP_KERNEL); if (likely(ctx)) { ctx->magic = magic; fc->fs_private = ctx; fc->ops = &pseudo_fs_context_ops; |
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fc->sb_flags |= SB_NOUSER; fc->global = true; |
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} |
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return ctx; |
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} |
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EXPORT_SYMBOL(init_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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|
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inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode); |
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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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|
078cd8279 fs: Replace CURRE... |
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inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode); |
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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, |
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struct inode *new_dir, struct dentry *new_dentry, unsigned int flags) |
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{ |
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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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|
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if (flags & ~RENAME_NOREPLACE) return -EINVAL; |
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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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380 |
drop_nlink(d_inode(new_dentry)); |
9a53c3a78 [PATCH] r/o bind ... |
381 |
drop_nlink(old_dir); |
841590ce1 fix IN_DELETE_SEL... |
382 |
} |
1da177e4c Linux-2.6.12-rc2 |
383 |
} else if (they_are_dirs) { |
9a53c3a78 [PATCH] r/o bind ... |
384 |
drop_nlink(old_dir); |
d8c76e6f4 [PATCH] r/o bind ... |
385 |
inc_nlink(new_dir); |
1da177e4c Linux-2.6.12-rc2 |
386 387 388 |
} old_dir->i_ctime = old_dir->i_mtime = new_dir->i_ctime = |
078cd8279 fs: Replace CURRE... |
389 |
new_dir->i_mtime = inode->i_ctime = current_time(old_dir); |
1da177e4c Linux-2.6.12-rc2 |
390 391 392 |
return 0; } |
12f388722 libfs: get export... |
393 |
EXPORT_SYMBOL(simple_rename); |
1da177e4c Linux-2.6.12-rc2 |
394 |
|
7bb46a673 fs: introduce new... |
395 |
/** |
eef2380c1 default to simple... |
396 |
* simple_setattr - setattr for simple filesystem |
7bb46a673 fs: introduce new... |
397 398 399 400 401 |
* @dentry: dentry * @iattr: iattr structure * * Returns 0 on success, -error on failure. * |
eef2380c1 default to simple... |
402 403 404 405 406 407 |
* 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. |
7bb46a673 fs: introduce new... |
408 409 410 |
*/ int simple_setattr(struct dentry *dentry, struct iattr *iattr) { |
dea655c28 VFS: fs library h... |
411 |
struct inode *inode = d_inode(dentry); |
7bb46a673 fs: introduce new... |
412 |
int error; |
31051c85b fs: Give dentry t... |
413 |
error = setattr_prepare(dentry, iattr); |
7bb46a673 fs: introduce new... |
414 415 |
if (error) return error; |
2c27c65ed check ATTR_SIZE c... |
416 417 |
if (iattr->ia_valid & ATTR_SIZE) truncate_setsize(inode, iattr->ia_size); |
6a1a90ad1 rename generic_se... |
418 |
setattr_copy(inode, iattr); |
eef2380c1 default to simple... |
419 420 |
mark_inode_dirty(inode); return 0; |
7bb46a673 fs: introduce new... |
421 422 |
} EXPORT_SYMBOL(simple_setattr); |
1da177e4c Linux-2.6.12-rc2 |
423 424 |
int simple_readpage(struct file *file, struct page *page) { |
c0d92cbc5 [PATCH] libfs: re... |
425 |
clear_highpage(page); |
1da177e4c Linux-2.6.12-rc2 |
426 427 |
flush_dcache_page(page); SetPageUptodate(page); |
1da177e4c Linux-2.6.12-rc2 |
428 429 430 |
unlock_page(page); return 0; } |
12f388722 libfs: get export... |
431 |
EXPORT_SYMBOL(simple_readpage); |
1da177e4c Linux-2.6.12-rc2 |
432 |
|
afddba49d fs: introduce wri... |
433 434 435 436 437 438 |
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... |
439 |
|
09cbfeaf1 mm, fs: get rid o... |
440 |
index = pos >> PAGE_SHIFT; |
afddba49d fs: introduce wri... |
441 |
|
54566b2c1 fs: symlink write... |
442 |
page = grab_cache_page_write_begin(mapping, index, flags); |
afddba49d fs: introduce wri... |
443 444 445 446 |
if (!page) return -ENOMEM; *pagep = page; |
09cbfeaf1 mm, fs: get rid o... |
447 448 |
if (!PageUptodate(page) && (len != PAGE_SIZE)) { unsigned from = pos & (PAGE_SIZE - 1); |
193cf4b99 libfs: Unexport a... |
449 |
|
09cbfeaf1 mm, fs: get rid o... |
450 |
zero_user_segments(page, 0, from, from + len, PAGE_SIZE); |
193cf4b99 libfs: Unexport a... |
451 452 |
} return 0; |
afddba49d fs: introduce wri... |
453 |
} |
12f388722 libfs: get export... |
454 |
EXPORT_SYMBOL(simple_write_begin); |
afddba49d fs: introduce wri... |
455 |
|
ad2a722f1 libfs: Open code ... |
456 457 |
/** * simple_write_end - .write_end helper for non-block-device FSes |
8e88bfba7 fs/libfs.c: fix k... |
458 |
* @file: See .write_end of address_space_operations |
ad2a722f1 libfs: Open code ... |
459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 |
* @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. |
04fff6416 simple_write_end(... |
475 476 |
* * Use *ONLY* with simple_readpage() |
ad2a722f1 libfs: Open code ... |
477 |
*/ |
afddba49d fs: introduce wri... |
478 479 480 481 |
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 ... |
482 483 |
struct inode *inode = page->mapping->host; loff_t last_pos = pos + copied; |
afddba49d fs: introduce wri... |
484 485 |
/* zero the stale part of the page if we did a short copy */ |
04fff6416 simple_write_end(... |
486 487 488 |
if (!PageUptodate(page)) { if (copied < len) { unsigned from = pos & (PAGE_SIZE - 1); |
afddba49d fs: introduce wri... |
489 |
|
04fff6416 simple_write_end(... |
490 491 |
zero_user(page, from + copied, len - copied); } |
ad2a722f1 libfs: Open code ... |
492 |
SetPageUptodate(page); |
04fff6416 simple_write_end(... |
493 |
} |
ad2a722f1 libfs: Open code ... |
494 495 496 497 498 499 |
/* * 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... |
500 |
|
ad2a722f1 libfs: Open code ... |
501 |
set_page_dirty(page); |
afddba49d fs: introduce wri... |
502 |
unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
503 |
put_page(page); |
afddba49d fs: introduce wri... |
504 505 506 |
return copied; } |
12f388722 libfs: get export... |
507 |
EXPORT_SYMBOL(simple_write_end); |
afddba49d fs: introduce wri... |
508 |
|
1a1c9bb43 inode numbering: ... |
509 510 511 512 513 |
/* * 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... |
514 |
int simple_fill_super(struct super_block *s, unsigned long magic, |
cda37124f fs: constify tree... |
515 |
const struct tree_descr *files) |
1da177e4c Linux-2.6.12-rc2 |
516 |
{ |
1da177e4c Linux-2.6.12-rc2 |
517 518 519 520 |
struct inode *inode; struct dentry *root; struct dentry *dentry; int i; |
09cbfeaf1 mm, fs: get rid o... |
521 522 |
s->s_blocksize = PAGE_SIZE; s->s_blocksize_bits = PAGE_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
523 |
s->s_magic = magic; |
759b9775c [PATCH] shmem and... |
524 |
s->s_op = &simple_super_operations; |
1da177e4c Linux-2.6.12-rc2 |
525 526 527 528 529 |
s->s_time_gran = 1; inode = new_inode(s); if (!inode) return -ENOMEM; |
1a1c9bb43 inode numbering: ... |
530 531 532 533 534 |
/* * 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 |
535 |
inode->i_mode = S_IFDIR | 0755; |
078cd8279 fs: Replace CURRE... |
536 |
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
537 538 |
inode->i_op = &simple_dir_inode_operations; inode->i_fop = &simple_dir_operations; |
bfe868486 filesystems: add ... |
539 |
set_nlink(inode, 2); |
48fde701a switch open-coded... |
540 541 |
root = d_make_root(inode); if (!root) |
1da177e4c Linux-2.6.12-rc2 |
542 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
543 544 545 |
for (i = 0; !files->name || files->name[0]; i++, files++) { if (!files->name) continue; |
1a1c9bb43 inode numbering: ... |
546 547 548 549 550 551 552 |
/* 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 |
553 554 555 556 |
dentry = d_alloc_name(root, files->name); if (!dentry) goto out; inode = new_inode(s); |
32096ea1a vfs: fix dentry l... |
557 558 |
if (!inode) { dput(dentry); |
1da177e4c Linux-2.6.12-rc2 |
559 |
goto out; |
32096ea1a vfs: fix dentry l... |
560 |
} |
1da177e4c Linux-2.6.12-rc2 |
561 |
inode->i_mode = S_IFREG | files->mode; |
078cd8279 fs: Replace CURRE... |
562 |
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
563 564 565 566 567 568 569 570 |
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... |
571 |
shrink_dcache_parent(root); |
1da177e4c Linux-2.6.12-rc2 |
572 573 574 |
dput(root); return -ENOMEM; } |
12f388722 libfs: get export... |
575 |
EXPORT_SYMBOL(simple_fill_super); |
1da177e4c Linux-2.6.12-rc2 |
576 577 |
static DEFINE_SPINLOCK(pin_fs_lock); |
1f5ce9e93 VFS: Unexport do_... |
578 |
int simple_pin_fs(struct file_system_type *type, struct vfsmount **mount, int *count) |
1da177e4c Linux-2.6.12-rc2 |
579 580 581 582 583 |
{ struct vfsmount *mnt = NULL; spin_lock(&pin_fs_lock); if (unlikely(!*mount)) { spin_unlock(&pin_fs_lock); |
1751e8a6c Rename superblock... |
584 |
mnt = vfs_kern_mount(type, SB_KERNMOUNT, type->name, NULL); |
1da177e4c Linux-2.6.12-rc2 |
585 586 587 588 589 590 591 592 593 594 595 596 |
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... |
597 |
EXPORT_SYMBOL(simple_pin_fs); |
1da177e4c Linux-2.6.12-rc2 |
598 599 600 601 602 603 604 605 606 607 608 |
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... |
609 |
EXPORT_SYMBOL(simple_release_fs); |
1da177e4c Linux-2.6.12-rc2 |
610 |
|
6d1029b56 add kernel-doc fo... |
611 612 613 614 615 616 617 618 619 620 621 622 623 624 |
/** * 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 |
625 626 627 628 |
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... |
629 |
size_t ret; |
1da177e4c Linux-2.6.12-rc2 |
630 631 |
if (pos < 0) return -EINVAL; |
14be27460 libfs: make simpl... |
632 |
if (pos >= available || !count) |
1da177e4c Linux-2.6.12-rc2 |
633 634 635 |
return 0; if (count > available - pos) count = available - pos; |
14be27460 libfs: make simpl... |
636 637 |
ret = copy_to_user(to, from + pos, count); if (ret == count) |
1da177e4c Linux-2.6.12-rc2 |
638 |
return -EFAULT; |
14be27460 libfs: make simpl... |
639 |
count -= ret; |
1da177e4c Linux-2.6.12-rc2 |
640 641 642 |
*ppos = pos + count; return count; } |
12f388722 libfs: get export... |
643 |
EXPORT_SYMBOL(simple_read_from_buffer); |
1da177e4c Linux-2.6.12-rc2 |
644 |
|
6d1029b56 add kernel-doc fo... |
645 |
/** |
6a727b43b FS / libfs: Imple... |
646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 |
* 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... |
678 |
EXPORT_SYMBOL(simple_write_to_buffer); |
6a727b43b FS / libfs: Imple... |
679 680 |
/** |
6d1029b56 add kernel-doc fo... |
681 682 683 684 685 686 687 688 689 690 691 692 693 |
* 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_... |
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 |
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... |
710 |
EXPORT_SYMBOL(memory_read_from_buffer); |
93b071139 introduce memory_... |
711 |
|
1da177e4c Linux-2.6.12-rc2 |
712 713 714 715 716 717 |
/* * 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... |
718 719 720 721 722 723 724 725 726 727 728 729 730 731 |
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... |
732 |
EXPORT_SYMBOL(simple_transaction_set); |
76791ab2d kmemtrace, fs: un... |
733 |
|
1da177e4c Linux-2.6.12-rc2 |
734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 |
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... |
764 |
EXPORT_SYMBOL(simple_transaction_get); |
1da177e4c Linux-2.6.12-rc2 |
765 766 767 768 769 770 771 772 773 |
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... |
774 |
EXPORT_SYMBOL(simple_transaction_read); |
1da177e4c Linux-2.6.12-rc2 |
775 776 777 778 779 780 |
int simple_transaction_release(struct inode *inode, struct file *file) { free_page((unsigned long)file->private_data); return 0; } |
12f388722 libfs: get export... |
781 |
EXPORT_SYMBOL(simple_transaction_release); |
1da177e4c Linux-2.6.12-rc2 |
782 |
|
acaefc25d [PATCH] libfs: ad... |
783 784 785 |
/* Simple attribute files */ struct simple_attr { |
8b88b0998 libfs: allow erro... |
786 787 |
int (*get)(void *, u64 *); int (*set)(void *, u64); |
acaefc25d [PATCH] libfs: ad... |
788 789 790 791 792 |
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... |
793 |
struct mutex mutex; /* protects access to these buffers */ |
acaefc25d [PATCH] libfs: ad... |
794 795 796 797 798 |
}; /* 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... |
799 |
int (*get)(void *, u64 *), int (*set)(void *, u64), |
acaefc25d [PATCH] libfs: ad... |
800 801 802 |
const char *fmt) { struct simple_attr *attr; |
b25af8451 libfs: fix infole... |
803 |
attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
acaefc25d [PATCH] libfs: ad... |
804 805 806 807 808 |
if (!attr) return -ENOMEM; attr->get = get; attr->set = set; |
8e18e2941 [PATCH] inode_die... |
809 |
attr->data = inode->i_private; |
acaefc25d [PATCH] libfs: ad... |
810 |
attr->fmt = fmt; |
7cf34c761 [PATCH] sem2mutex... |
811 |
mutex_init(&attr->mutex); |
acaefc25d [PATCH] libfs: ad... |
812 813 814 815 816 |
file->private_data = attr; return nonseekable_open(inode, file); } |
12f388722 libfs: get export... |
817 |
EXPORT_SYMBOL_GPL(simple_attr_open); |
acaefc25d [PATCH] libfs: ad... |
818 |
|
74bedc4d5 libfs: rename sim... |
819 |
int simple_attr_release(struct inode *inode, struct file *file) |
acaefc25d [PATCH] libfs: ad... |
820 821 822 823 |
{ kfree(file->private_data); return 0; } |
12f388722 libfs: get export... |
824 |
EXPORT_SYMBOL_GPL(simple_attr_release); /* GPL-only? This? Really? */ |
acaefc25d [PATCH] libfs: ad... |
825 826 827 828 829 830 831 832 833 834 835 836 837 |
/* 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... |
838 839 840 |
ret = mutex_lock_interruptible(&attr->mutex); if (ret) return ret; |
b25af8451 libfs: fix infole... |
841 842 |
if (*ppos && attr->get_buf[0]) { /* continued read */ |
acaefc25d [PATCH] libfs: ad... |
843 |
size = strlen(attr->get_buf); |
b25af8451 libfs: fix infole... |
844 845 |
} else { /* first read */ |
8b88b0998 libfs: allow erro... |
846 847 848 849 |
u64 val; ret = attr->get(attr->data, &val); if (ret) goto out; |
acaefc25d [PATCH] libfs: ad... |
850 |
size = scnprintf(attr->get_buf, sizeof(attr->get_buf), |
8b88b0998 libfs: allow erro... |
851 852 |
attr->fmt, (unsigned long long)val); } |
acaefc25d [PATCH] libfs: ad... |
853 854 |
ret = simple_read_from_buffer(buf, len, ppos, attr->get_buf, size); |
8b88b0998 libfs: allow erro... |
855 |
out: |
7cf34c761 [PATCH] sem2mutex... |
856 |
mutex_unlock(&attr->mutex); |
acaefc25d [PATCH] libfs: ad... |
857 858 |
return ret; } |
12f388722 libfs: get export... |
859 |
EXPORT_SYMBOL_GPL(simple_attr_read); |
acaefc25d [PATCH] libfs: ad... |
860 861 862 863 864 865 866 867 868 869 870 |
/* 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... |
871 872 |
if (!attr->set) return -EACCES; |
9261303ab libfs: make simpl... |
873 874 875 |
ret = mutex_lock_interruptible(&attr->mutex); if (ret) return ret; |
acaefc25d [PATCH] libfs: ad... |
876 877 878 879 |
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... |
880 |
attr->set_buf[size] = '\0'; |
f7b88631a fs/libfs.c: fix s... |
881 |
val = simple_strtoll(attr->set_buf, NULL, 0); |
05cc0cee6 libfs: return err... |
882 883 884 |
ret = attr->set(attr->data, val); if (ret == 0) ret = len; /* on success, claim we got the whole input */ |
acaefc25d [PATCH] libfs: ad... |
885 |
out: |
7cf34c761 [PATCH] sem2mutex... |
886 |
mutex_unlock(&attr->mutex); |
acaefc25d [PATCH] libfs: ad... |
887 888 |
return ret; } |
12f388722 libfs: get export... |
889 |
EXPORT_SYMBOL_GPL(simple_attr_write); |
acaefc25d [PATCH] libfs: ad... |
890 |
|
2596110a3 exportfs: add new... |
891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 |
/** * 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... |
918 |
return d_obtain_alias(inode); |
2596110a3 exportfs: add new... |
919 920 921 922 |
} EXPORT_SYMBOL_GPL(generic_fh_to_dentry); /** |
ca1868309 vfs: fix kerneldo... |
923 |
* generic_fh_to_parent - generic helper for the fh_to_parent export operation |
2596110a3 exportfs: add new... |
924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 |
* @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... |
950 |
return d_obtain_alias(inode); |
2596110a3 exportfs: add new... |
951 952 |
} EXPORT_SYMBOL_GPL(generic_fh_to_parent); |
1b061d924 rename the generi... |
953 |
/** |
ac13a829f fs/libfs.c: add g... |
954 955 |
* __generic_file_fsync - generic fsync implementation for simple filesystems * |
1b061d924 rename the generi... |
956 |
* @file: file to synchronize |
ac13a829f fs/libfs.c: add g... |
957 958 |
* @start: start offset in bytes * @end: end offset in bytes (inclusive) |
1b061d924 rename the generi... |
959 960 961 962 963 964 |
* @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... |
965 966 |
int __generic_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
d5aacad54 New helper - simp... |
967 |
{ |
7ea808591 drop unused dentr... |
968 |
struct inode *inode = file->f_mapping->host; |
d5aacad54 New helper - simp... |
969 970 |
int err; int ret; |
383aa543c fs: convert __gen... |
971 |
err = file_write_and_wait_range(file, start, end); |
02c24a821 fs: push i_mutex ... |
972 973 |
if (err) return err; |
5955102c9 wrappers for ->i_... |
974 |
inode_lock(inode); |
d5aacad54 New helper - simp... |
975 |
ret = sync_mapping_buffers(inode->i_mapping); |
0ae45f63d vfs: add support ... |
976 |
if (!(inode->i_state & I_DIRTY_ALL)) |
02c24a821 fs: push i_mutex ... |
977 |
goto out; |
d5aacad54 New helper - simp... |
978 |
if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) |
02c24a821 fs: push i_mutex ... |
979 |
goto out; |
d5aacad54 New helper - simp... |
980 |
|
c37650161 fs: add sync_inod... |
981 |
err = sync_inode_metadata(inode, 1); |
d5aacad54 New helper - simp... |
982 983 |
if (ret == 0) ret = err; |
ac13a829f fs/libfs.c: add g... |
984 |
|
02c24a821 fs: push i_mutex ... |
985 |
out: |
5955102c9 wrappers for ->i_... |
986 |
inode_unlock(inode); |
383aa543c fs: convert __gen... |
987 988 989 990 991 |
/* check and advance again to catch errors after syncing out buffers */ err = file_check_and_advance_wb_err(file); if (ret == 0) ret = err; return ret; |
d5aacad54 New helper - simp... |
992 |
} |
ac13a829f fs/libfs.c: add g... |
993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 |
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... |
1016 |
EXPORT_SYMBOL(generic_file_fsync); |
30ca22c70 ext3/ext4: Factor... |
1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 |
/** * 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 ... |
1029 |
u64 last_fs_page = |
09cbfeaf1 mm, fs: get rid o... |
1030 |
last_fs_block >> (PAGE_SHIFT - blocksize_bits); |
30ca22c70 ext3/ext4: Factor... |
1031 1032 1033 |
if (unlikely(num_blocks == 0)) return 0; |
09cbfeaf1 mm, fs: get rid o... |
1034 |
if ((blocksize_bits < 9) || (blocksize_bits > PAGE_SHIFT)) |
30ca22c70 ext3/ext4: Factor... |
1035 |
return -EINVAL; |
a33f13efe libfs: Fix shift ... |
1036 1037 |
if ((last_fs_block > (sector_t)(~0ULL) >> (blocksize_bits - 9)) || (last_fs_page > (pgoff_t)(~0ULL))) { |
30ca22c70 ext3/ext4: Factor... |
1038 1039 1040 1041 1042 |
return -EFBIG; } return 0; } EXPORT_SYMBOL(generic_check_addressable); |
1b061d924 rename the generi... |
1043 1044 1045 |
/* * No-op implementation of ->fsync for in-memory filesystems. */ |
02c24a821 fs: push i_mutex ... |
1046 |
int noop_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
1b061d924 rename the generi... |
1047 1048 1049 |
{ return 0; } |
1b061d924 rename the generi... |
1050 |
EXPORT_SYMBOL(noop_fsync); |
87dc800be new helper: kfree... |
1051 |
|
f44c77630 fs, dax: prepare ... |
1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 |
int noop_set_page_dirty(struct page *page) { /* * Unlike __set_page_dirty_no_writeback that handles dirty page * tracking in the page object, dax does all dirty tracking in * the inode address_space in response to mkwrite faults. In the * dax case we only need to worry about potentially dirty CPU * caches, not dirty page cache pages to write back. * * This callback is defined to prevent fallback to * __set_page_dirty_buffers() in set_page_dirty(). */ return 0; } EXPORT_SYMBOL_GPL(noop_set_page_dirty); void noop_invalidatepage(struct page *page, unsigned int offset, unsigned int length) { /* * There is no page cache to invalidate in the dax case, however * we need this callback defined to prevent falling back to * block_invalidatepage() in do_invalidatepage(). */ } EXPORT_SYMBOL_GPL(noop_invalidatepage); ssize_t noop_direct_IO(struct kiocb *iocb, struct iov_iter *iter) { /* * iomap based filesystems support direct I/O without need for * this callback. However, it still needs to be set in * inode->a_ops so that open/fcntl know that direct I/O is * generally supported. */ return -EINVAL; } EXPORT_SYMBOL_GPL(noop_direct_IO); |
fceef393a switch ->get_link... |
1090 1091 |
/* Because kfree isn't assignment-compatible with void(void*) ;-/ */ void kfree_link(void *p) |
87dc800be new helper: kfree... |
1092 |
{ |
fceef393a switch ->get_link... |
1093 |
kfree(p); |
87dc800be new helper: kfree... |
1094 |
} |
fceef393a switch ->get_link... |
1095 |
EXPORT_SYMBOL(kfree_link); |
6987843ff take anon inode a... |
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 |
/* * 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; |
078cd8279 fs: Replace CURRE... |
1135 |
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
6987843ff take anon inode a... |
1136 1137 1138 |
return inode; } EXPORT_SYMBOL(alloc_anon_inode); |
1c994a090 locks: consolidat... |
1139 1140 1141 1142 1143 1144 |
/** * 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... |
1145 |
* @priv: private data for lm_setup operation |
1c994a090 locks: consolidat... |
1146 1147 1148 1149 1150 |
* * 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... |
1151 1152 |
simple_nosetlease(struct file *filp, long arg, struct file_lock **flp, void **priv) |
1c994a090 locks: consolidat... |
1153 1154 1155 1156 |
{ return -EINVAL; } EXPORT_SYMBOL(simple_nosetlease); |
61ba64fc0 libfs: simple_fol... |
1157 |
|
6ee9706aa libfs: document s... |
1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 |
/** * simple_get_link - generic helper to get the target of "fast" symlinks * @dentry: not used here * @inode: the symlink inode * @done: not used here * * Generic helper for filesystems to use for symlink inodes where a pointer to * the symlink target is stored in ->i_link. NOTE: this isn't normally called, * since as an optimization the path lookup code uses any non-NULL ->i_link * directly, without calling ->get_link(). But ->get_link() still must be set, * to mark the inode_operations as being for a symlink. * * Return: the symlink target */ |
6b2553918 replace ->follow_... |
1172 |
const char *simple_get_link(struct dentry *dentry, struct inode *inode, |
fceef393a switch ->get_link... |
1173 |
struct delayed_call *done) |
61ba64fc0 libfs: simple_fol... |
1174 |
{ |
6b2553918 replace ->follow_... |
1175 |
return inode->i_link; |
61ba64fc0 libfs: simple_fol... |
1176 |
} |
6b2553918 replace ->follow_... |
1177 |
EXPORT_SYMBOL(simple_get_link); |
61ba64fc0 libfs: simple_fol... |
1178 1179 |
const struct inode_operations simple_symlink_inode_operations = { |
6b2553918 replace ->follow_... |
1180 |
.get_link = simple_get_link, |
61ba64fc0 libfs: simple_fol... |
1181 1182 |
}; EXPORT_SYMBOL(simple_symlink_inode_operations); |
fbabfd0f4 fs: Add helper fu... |
1183 1184 1185 1186 1187 1188 1189 1190 |
/* * 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); } |
a528d35e8 statx: Add a syst... |
1191 1192 |
static int empty_dir_getattr(const struct path *path, struct kstat *stat, u32 request_mask, unsigned int query_flags) |
fbabfd0f4 fs: Add helper fu... |
1193 |
{ |
a528d35e8 statx: Add a syst... |
1194 |
struct inode *inode = d_inode(path->dentry); |
fbabfd0f4 fs: Add helper fu... |
1195 1196 1197 1198 1199 1200 1201 1202 |
generic_fillattr(inode, stat); return 0; } static int empty_dir_setattr(struct dentry *dentry, struct iattr *attr) { return -EPERM; } |
fbabfd0f4 fs: Add helper fu... |
1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 |
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, |
fbabfd0f4 fs: Add helper fu... |
1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 |
.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, |
c51da20c4 more trivial ->it... |
1231 |
.iterate_shared = empty_dir_readdir, |
fbabfd0f4 fs: Add helper fu... |
1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 |
.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 ... |
1243 |
inode->i_size = 0; |
fbabfd0f4 fs: Add helper fu... |
1244 1245 1246 1247 |
inode->i_blkbits = PAGE_SHIFT; inode->i_blocks = 0; inode->i_op = &empty_dir_inode_operations; |
f5c244383 libfs: Use IOP_XA... |
1248 |
inode->i_opflags &= ~IOP_XATTR; |
fbabfd0f4 fs: Add helper fu... |
1249 1250 1251 1252 1253 1254 1255 1256 |
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); } |