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fs/libfs.c
37.2 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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#include <linux/fsnotify.h> |
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#include <linux/unicode.h> #include <linux/fscrypt.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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fallthrough; |
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case 0: if (offset >= 0) break; |
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fallthrough; |
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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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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 struct dentry *find_next_child(struct dentry *parent, struct dentry *prev) { struct dentry *child = NULL; struct list_head *p = prev ? &prev->d_child : &parent->d_subdirs; spin_lock(&parent->d_lock); while ((p = p->next) != &parent->d_subdirs) { struct dentry *d = container_of(p, struct dentry, d_child); if (simple_positive(d)) { spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED); if (simple_positive(d)) child = dget_dlock(d); spin_unlock(&d->d_lock); if (likely(child)) break; } } spin_unlock(&parent->d_lock); dput(prev); return child; } void simple_recursive_removal(struct dentry *dentry, void (*callback)(struct dentry *)) { struct dentry *this = dget(dentry); while (true) { struct dentry *victim = NULL, *child; struct inode *inode = this->d_inode; inode_lock(inode); if (d_is_dir(this)) inode->i_flags |= S_DEAD; while ((child = find_next_child(this, victim)) == NULL) { // kill and ascend // update metadata while it's still locked inode->i_ctime = current_time(inode); clear_nlink(inode); inode_unlock(inode); victim = this; this = this->d_parent; inode = this->d_inode; inode_lock(inode); if (simple_positive(victim)) { d_invalidate(victim); // avoid lost mounts if (d_is_dir(victim)) fsnotify_rmdir(inode, victim); else fsnotify_unlink(inode, victim); if (callback) callback(victim); dput(victim); // unpin it } if (victim == dentry) { inode->i_ctime = inode->i_mtime = current_time(inode); if (d_is_dir(dentry)) drop_nlink(inode); inode_unlock(inode); dput(dentry); return; } } inode_unlock(inode); this = child; } } EXPORT_SYMBOL(simple_recursive_removal); |
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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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|
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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; } |
12f388722 libfs: get export... |
424 |
EXPORT_SYMBOL(simple_unlink); |
1da177e4c Linux-2.6.12-rc2 |
425 426 427 428 429 |
int simple_rmdir(struct inode *dir, struct dentry *dentry) { if (!simple_empty(dentry)) return -ENOTEMPTY; |
dea655c28 VFS: fs library h... |
430 |
drop_nlink(d_inode(dentry)); |
1da177e4c Linux-2.6.12-rc2 |
431 |
simple_unlink(dir, dentry); |
9a53c3a78 [PATCH] r/o bind ... |
432 |
drop_nlink(dir); |
1da177e4c Linux-2.6.12-rc2 |
433 434 |
return 0; } |
12f388722 libfs: get export... |
435 |
EXPORT_SYMBOL(simple_rmdir); |
1da177e4c Linux-2.6.12-rc2 |
436 437 |
int simple_rename(struct inode *old_dir, struct dentry *old_dentry, |
e0e0be8a8 libfs: support RE... |
438 439 |
struct inode *new_dir, struct dentry *new_dentry, unsigned int flags) |
1da177e4c Linux-2.6.12-rc2 |
440 |
{ |
dea655c28 VFS: fs library h... |
441 |
struct inode *inode = d_inode(old_dentry); |
e36cb0b89 VFS: (Scripted) C... |
442 |
int they_are_dirs = d_is_dir(old_dentry); |
1da177e4c Linux-2.6.12-rc2 |
443 |
|
e0e0be8a8 libfs: support RE... |
444 445 |
if (flags & ~RENAME_NOREPLACE) return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
446 447 |
if (!simple_empty(new_dentry)) return -ENOTEMPTY; |
dea655c28 VFS: fs library h... |
448 |
if (d_really_is_positive(new_dentry)) { |
1da177e4c Linux-2.6.12-rc2 |
449 |
simple_unlink(new_dir, new_dentry); |
841590ce1 fix IN_DELETE_SEL... |
450 |
if (they_are_dirs) { |
dea655c28 VFS: fs library h... |
451 |
drop_nlink(d_inode(new_dentry)); |
9a53c3a78 [PATCH] r/o bind ... |
452 |
drop_nlink(old_dir); |
841590ce1 fix IN_DELETE_SEL... |
453 |
} |
1da177e4c Linux-2.6.12-rc2 |
454 |
} else if (they_are_dirs) { |
9a53c3a78 [PATCH] r/o bind ... |
455 |
drop_nlink(old_dir); |
d8c76e6f4 [PATCH] r/o bind ... |
456 |
inc_nlink(new_dir); |
1da177e4c Linux-2.6.12-rc2 |
457 458 459 |
} old_dir->i_ctime = old_dir->i_mtime = new_dir->i_ctime = |
078cd8279 fs: Replace CURRE... |
460 |
new_dir->i_mtime = inode->i_ctime = current_time(old_dir); |
1da177e4c Linux-2.6.12-rc2 |
461 462 463 |
return 0; } |
12f388722 libfs: get export... |
464 |
EXPORT_SYMBOL(simple_rename); |
1da177e4c Linux-2.6.12-rc2 |
465 |
|
7bb46a673 fs: introduce new... |
466 |
/** |
eef2380c1 default to simple... |
467 |
* simple_setattr - setattr for simple filesystem |
7bb46a673 fs: introduce new... |
468 469 470 471 472 |
* @dentry: dentry * @iattr: iattr structure * * Returns 0 on success, -error on failure. * |
eef2380c1 default to simple... |
473 474 475 476 477 478 |
* 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... |
479 480 481 |
*/ int simple_setattr(struct dentry *dentry, struct iattr *iattr) { |
dea655c28 VFS: fs library h... |
482 |
struct inode *inode = d_inode(dentry); |
7bb46a673 fs: introduce new... |
483 |
int error; |
31051c85b fs: Give dentry t... |
484 |
error = setattr_prepare(dentry, iattr); |
7bb46a673 fs: introduce new... |
485 486 |
if (error) return error; |
2c27c65ed check ATTR_SIZE c... |
487 488 |
if (iattr->ia_valid & ATTR_SIZE) truncate_setsize(inode, iattr->ia_size); |
6a1a90ad1 rename generic_se... |
489 |
setattr_copy(inode, iattr); |
eef2380c1 default to simple... |
490 491 |
mark_inode_dirty(inode); return 0; |
7bb46a673 fs: introduce new... |
492 493 |
} EXPORT_SYMBOL(simple_setattr); |
1da177e4c Linux-2.6.12-rc2 |
494 495 |
int simple_readpage(struct file *file, struct page *page) { |
c0d92cbc5 [PATCH] libfs: re... |
496 |
clear_highpage(page); |
1da177e4c Linux-2.6.12-rc2 |
497 498 |
flush_dcache_page(page); SetPageUptodate(page); |
1da177e4c Linux-2.6.12-rc2 |
499 500 501 |
unlock_page(page); return 0; } |
12f388722 libfs: get export... |
502 |
EXPORT_SYMBOL(simple_readpage); |
1da177e4c Linux-2.6.12-rc2 |
503 |
|
afddba49d fs: introduce wri... |
504 505 506 507 508 509 |
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... |
510 |
|
09cbfeaf1 mm, fs: get rid o... |
511 |
index = pos >> PAGE_SHIFT; |
afddba49d fs: introduce wri... |
512 |
|
54566b2c1 fs: symlink write... |
513 |
page = grab_cache_page_write_begin(mapping, index, flags); |
afddba49d fs: introduce wri... |
514 515 516 517 |
if (!page) return -ENOMEM; *pagep = page; |
09cbfeaf1 mm, fs: get rid o... |
518 519 |
if (!PageUptodate(page) && (len != PAGE_SIZE)) { unsigned from = pos & (PAGE_SIZE - 1); |
193cf4b99 libfs: Unexport a... |
520 |
|
09cbfeaf1 mm, fs: get rid o... |
521 |
zero_user_segments(page, 0, from, from + len, PAGE_SIZE); |
193cf4b99 libfs: Unexport a... |
522 523 |
} return 0; |
afddba49d fs: introduce wri... |
524 |
} |
12f388722 libfs: get export... |
525 |
EXPORT_SYMBOL(simple_write_begin); |
afddba49d fs: introduce wri... |
526 |
|
ad2a722f1 libfs: Open code ... |
527 528 |
/** * simple_write_end - .write_end helper for non-block-device FSes |
8e88bfba7 fs/libfs.c: fix k... |
529 |
* @file: See .write_end of address_space_operations |
ad2a722f1 libfs: Open code ... |
530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 |
* @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(... |
546 547 |
* * Use *ONLY* with simple_readpage() |
ad2a722f1 libfs: Open code ... |
548 |
*/ |
afddba49d fs: introduce wri... |
549 550 551 552 |
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 ... |
553 554 |
struct inode *inode = page->mapping->host; loff_t last_pos = pos + copied; |
afddba49d fs: introduce wri... |
555 556 |
/* zero the stale part of the page if we did a short copy */ |
04fff6416 simple_write_end(... |
557 558 559 |
if (!PageUptodate(page)) { if (copied < len) { unsigned from = pos & (PAGE_SIZE - 1); |
afddba49d fs: introduce wri... |
560 |
|
04fff6416 simple_write_end(... |
561 562 |
zero_user(page, from + copied, len - copied); } |
ad2a722f1 libfs: Open code ... |
563 |
SetPageUptodate(page); |
04fff6416 simple_write_end(... |
564 |
} |
ad2a722f1 libfs: Open code ... |
565 566 567 568 569 570 |
/* * 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... |
571 |
|
ad2a722f1 libfs: Open code ... |
572 |
set_page_dirty(page); |
afddba49d fs: introduce wri... |
573 |
unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
574 |
put_page(page); |
afddba49d fs: introduce wri... |
575 576 577 |
return copied; } |
12f388722 libfs: get export... |
578 |
EXPORT_SYMBOL(simple_write_end); |
afddba49d fs: introduce wri... |
579 |
|
1a1c9bb43 inode numbering: ... |
580 581 582 583 584 |
/* * 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... |
585 |
int simple_fill_super(struct super_block *s, unsigned long magic, |
cda37124f fs: constify tree... |
586 |
const struct tree_descr *files) |
1da177e4c Linux-2.6.12-rc2 |
587 |
{ |
1da177e4c Linux-2.6.12-rc2 |
588 589 590 591 |
struct inode *inode; struct dentry *root; struct dentry *dentry; int i; |
09cbfeaf1 mm, fs: get rid o... |
592 593 |
s->s_blocksize = PAGE_SIZE; s->s_blocksize_bits = PAGE_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
594 |
s->s_magic = magic; |
759b9775c [PATCH] shmem and... |
595 |
s->s_op = &simple_super_operations; |
1da177e4c Linux-2.6.12-rc2 |
596 597 598 599 600 |
s->s_time_gran = 1; inode = new_inode(s); if (!inode) return -ENOMEM; |
1a1c9bb43 inode numbering: ... |
601 602 603 604 605 |
/* * 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 |
606 |
inode->i_mode = S_IFDIR | 0755; |
078cd8279 fs: Replace CURRE... |
607 |
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
608 609 |
inode->i_op = &simple_dir_inode_operations; inode->i_fop = &simple_dir_operations; |
bfe868486 filesystems: add ... |
610 |
set_nlink(inode, 2); |
48fde701a switch open-coded... |
611 612 |
root = d_make_root(inode); if (!root) |
1da177e4c Linux-2.6.12-rc2 |
613 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
614 615 616 |
for (i = 0; !files->name || files->name[0]; i++, files++) { if (!files->name) continue; |
1a1c9bb43 inode numbering: ... |
617 618 619 620 621 622 623 |
/* 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 |
624 625 626 627 |
dentry = d_alloc_name(root, files->name); if (!dentry) goto out; inode = new_inode(s); |
32096ea1a vfs: fix dentry l... |
628 629 |
if (!inode) { dput(dentry); |
1da177e4c Linux-2.6.12-rc2 |
630 |
goto out; |
32096ea1a vfs: fix dentry l... |
631 |
} |
1da177e4c Linux-2.6.12-rc2 |
632 |
inode->i_mode = S_IFREG | files->mode; |
078cd8279 fs: Replace CURRE... |
633 |
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
634 635 636 637 638 639 640 641 |
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... |
642 |
shrink_dcache_parent(root); |
1da177e4c Linux-2.6.12-rc2 |
643 644 645 |
dput(root); return -ENOMEM; } |
12f388722 libfs: get export... |
646 |
EXPORT_SYMBOL(simple_fill_super); |
1da177e4c Linux-2.6.12-rc2 |
647 648 |
static DEFINE_SPINLOCK(pin_fs_lock); |
1f5ce9e93 VFS: Unexport do_... |
649 |
int simple_pin_fs(struct file_system_type *type, struct vfsmount **mount, int *count) |
1da177e4c Linux-2.6.12-rc2 |
650 651 652 653 654 |
{ struct vfsmount *mnt = NULL; spin_lock(&pin_fs_lock); if (unlikely(!*mount)) { spin_unlock(&pin_fs_lock); |
1751e8a6c Rename superblock... |
655 |
mnt = vfs_kern_mount(type, SB_KERNMOUNT, type->name, NULL); |
1da177e4c Linux-2.6.12-rc2 |
656 657 658 659 660 661 662 663 664 665 666 667 |
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... |
668 |
EXPORT_SYMBOL(simple_pin_fs); |
1da177e4c Linux-2.6.12-rc2 |
669 670 671 672 673 674 675 676 677 678 679 |
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... |
680 |
EXPORT_SYMBOL(simple_release_fs); |
1da177e4c Linux-2.6.12-rc2 |
681 |
|
6d1029b56 add kernel-doc fo... |
682 683 684 685 686 687 688 689 690 691 692 693 694 695 |
/** * 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 |
696 697 698 699 |
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... |
700 |
size_t ret; |
1da177e4c Linux-2.6.12-rc2 |
701 702 |
if (pos < 0) return -EINVAL; |
14be27460 libfs: make simpl... |
703 |
if (pos >= available || !count) |
1da177e4c Linux-2.6.12-rc2 |
704 705 706 |
return 0; if (count > available - pos) count = available - pos; |
14be27460 libfs: make simpl... |
707 708 |
ret = copy_to_user(to, from + pos, count); if (ret == count) |
1da177e4c Linux-2.6.12-rc2 |
709 |
return -EFAULT; |
14be27460 libfs: make simpl... |
710 |
count -= ret; |
1da177e4c Linux-2.6.12-rc2 |
711 712 713 |
*ppos = pos + count; return count; } |
12f388722 libfs: get export... |
714 |
EXPORT_SYMBOL(simple_read_from_buffer); |
1da177e4c Linux-2.6.12-rc2 |
715 |
|
6d1029b56 add kernel-doc fo... |
716 |
/** |
6a727b43b FS / libfs: Imple... |
717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 |
* 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... |
749 |
EXPORT_SYMBOL(simple_write_to_buffer); |
6a727b43b FS / libfs: Imple... |
750 751 |
/** |
6d1029b56 add kernel-doc fo... |
752 753 754 755 756 757 758 759 760 761 762 763 764 |
* 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_... |
765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 |
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... |
781 |
EXPORT_SYMBOL(memory_read_from_buffer); |
93b071139 introduce memory_... |
782 |
|
1da177e4c Linux-2.6.12-rc2 |
783 784 785 786 787 788 |
/* * 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... |
789 790 791 792 793 794 795 796 797 798 799 800 801 802 |
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... |
803 |
EXPORT_SYMBOL(simple_transaction_set); |
76791ab2d kmemtrace, fs: un... |
804 |
|
1da177e4c Linux-2.6.12-rc2 |
805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 |
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... |
835 |
EXPORT_SYMBOL(simple_transaction_get); |
1da177e4c Linux-2.6.12-rc2 |
836 837 838 839 840 841 842 843 844 |
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... |
845 |
EXPORT_SYMBOL(simple_transaction_read); |
1da177e4c Linux-2.6.12-rc2 |
846 847 848 849 850 851 |
int simple_transaction_release(struct inode *inode, struct file *file) { free_page((unsigned long)file->private_data); return 0; } |
12f388722 libfs: get export... |
852 |
EXPORT_SYMBOL(simple_transaction_release); |
1da177e4c Linux-2.6.12-rc2 |
853 |
|
acaefc25d [PATCH] libfs: ad... |
854 855 856 |
/* Simple attribute files */ struct simple_attr { |
8b88b0998 libfs: allow erro... |
857 858 |
int (*get)(void *, u64 *); int (*set)(void *, u64); |
acaefc25d [PATCH] libfs: ad... |
859 860 861 862 863 |
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... |
864 |
struct mutex mutex; /* protects access to these buffers */ |
acaefc25d [PATCH] libfs: ad... |
865 866 867 868 869 |
}; /* 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... |
870 |
int (*get)(void *, u64 *), int (*set)(void *, u64), |
acaefc25d [PATCH] libfs: ad... |
871 872 873 |
const char *fmt) { struct simple_attr *attr; |
a65cab7d7 libfs: fix infole... |
874 |
attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
acaefc25d [PATCH] libfs: ad... |
875 876 877 878 879 |
if (!attr) return -ENOMEM; attr->get = get; attr->set = set; |
8e18e2941 [PATCH] inode_die... |
880 |
attr->data = inode->i_private; |
acaefc25d [PATCH] libfs: ad... |
881 |
attr->fmt = fmt; |
7cf34c761 [PATCH] sem2mutex... |
882 |
mutex_init(&attr->mutex); |
acaefc25d [PATCH] libfs: ad... |
883 884 885 886 887 |
file->private_data = attr; return nonseekable_open(inode, file); } |
12f388722 libfs: get export... |
888 |
EXPORT_SYMBOL_GPL(simple_attr_open); |
acaefc25d [PATCH] libfs: ad... |
889 |
|
74bedc4d5 libfs: rename sim... |
890 |
int simple_attr_release(struct inode *inode, struct file *file) |
acaefc25d [PATCH] libfs: ad... |
891 892 893 894 |
{ kfree(file->private_data); return 0; } |
12f388722 libfs: get export... |
895 |
EXPORT_SYMBOL_GPL(simple_attr_release); /* GPL-only? This? Really? */ |
acaefc25d [PATCH] libfs: ad... |
896 897 898 899 900 901 902 903 904 905 906 907 908 |
/* 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... |
909 910 911 |
ret = mutex_lock_interruptible(&attr->mutex); if (ret) return ret; |
a65cab7d7 libfs: fix infole... |
912 913 |
if (*ppos && attr->get_buf[0]) { /* continued read */ |
acaefc25d [PATCH] libfs: ad... |
914 |
size = strlen(attr->get_buf); |
a65cab7d7 libfs: fix infole... |
915 916 |
} else { /* first read */ |
8b88b0998 libfs: allow erro... |
917 918 919 920 |
u64 val; ret = attr->get(attr->data, &val); if (ret) goto out; |
acaefc25d [PATCH] libfs: ad... |
921 |
size = scnprintf(attr->get_buf, sizeof(attr->get_buf), |
8b88b0998 libfs: allow erro... |
922 923 |
attr->fmt, (unsigned long long)val); } |
acaefc25d [PATCH] libfs: ad... |
924 925 |
ret = simple_read_from_buffer(buf, len, ppos, attr->get_buf, size); |
8b88b0998 libfs: allow erro... |
926 |
out: |
7cf34c761 [PATCH] sem2mutex... |
927 |
mutex_unlock(&attr->mutex); |
acaefc25d [PATCH] libfs: ad... |
928 929 |
return ret; } |
12f388722 libfs: get export... |
930 |
EXPORT_SYMBOL_GPL(simple_attr_read); |
acaefc25d [PATCH] libfs: ad... |
931 932 933 934 935 936 |
/* 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; |
488dac0c9 libfs: fix error ... |
937 |
unsigned long long val; |
acaefc25d [PATCH] libfs: ad... |
938 939 940 941 |
size_t size; ssize_t ret; attr = file->private_data; |
acaefc25d [PATCH] libfs: ad... |
942 943 |
if (!attr->set) return -EACCES; |
9261303ab libfs: make simpl... |
944 945 946 |
ret = mutex_lock_interruptible(&attr->mutex); if (ret) return ret; |
acaefc25d [PATCH] libfs: ad... |
947 948 949 950 |
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... |
951 |
attr->set_buf[size] = '\0'; |
488dac0c9 libfs: fix error ... |
952 953 954 |
ret = kstrtoull(attr->set_buf, 0, &val); if (ret) goto out; |
05cc0cee6 libfs: return err... |
955 956 957 |
ret = attr->set(attr->data, val); if (ret == 0) ret = len; /* on success, claim we got the whole input */ |
acaefc25d [PATCH] libfs: ad... |
958 |
out: |
7cf34c761 [PATCH] sem2mutex... |
959 |
mutex_unlock(&attr->mutex); |
acaefc25d [PATCH] libfs: ad... |
960 961 |
return ret; } |
12f388722 libfs: get export... |
962 |
EXPORT_SYMBOL_GPL(simple_attr_write); |
acaefc25d [PATCH] libfs: ad... |
963 |
|
2596110a3 exportfs: add new... |
964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 |
/** * 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... |
991 |
return d_obtain_alias(inode); |
2596110a3 exportfs: add new... |
992 993 994 995 |
} EXPORT_SYMBOL_GPL(generic_fh_to_dentry); /** |
ca1868309 vfs: fix kerneldo... |
996 |
* generic_fh_to_parent - generic helper for the fh_to_parent export operation |
2596110a3 exportfs: add new... |
997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 |
* @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... |
1023 |
return d_obtain_alias(inode); |
2596110a3 exportfs: add new... |
1024 1025 |
} EXPORT_SYMBOL_GPL(generic_fh_to_parent); |
1b061d924 rename the generi... |
1026 |
/** |
ac13a829f fs/libfs.c: add g... |
1027 1028 |
* __generic_file_fsync - generic fsync implementation for simple filesystems * |
1b061d924 rename the generi... |
1029 |
* @file: file to synchronize |
ac13a829f fs/libfs.c: add g... |
1030 1031 |
* @start: start offset in bytes * @end: end offset in bytes (inclusive) |
1b061d924 rename the generi... |
1032 1033 1034 1035 1036 1037 |
* @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... |
1038 1039 |
int __generic_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
d5aacad54 New helper - simp... |
1040 |
{ |
7ea808591 drop unused dentr... |
1041 |
struct inode *inode = file->f_mapping->host; |
d5aacad54 New helper - simp... |
1042 1043 |
int err; int ret; |
383aa543c fs: convert __gen... |
1044 |
err = file_write_and_wait_range(file, start, end); |
02c24a821 fs: push i_mutex ... |
1045 1046 |
if (err) return err; |
5955102c9 wrappers for ->i_... |
1047 |
inode_lock(inode); |
d5aacad54 New helper - simp... |
1048 |
ret = sync_mapping_buffers(inode->i_mapping); |
0ae45f63d vfs: add support ... |
1049 |
if (!(inode->i_state & I_DIRTY_ALL)) |
02c24a821 fs: push i_mutex ... |
1050 |
goto out; |
d5aacad54 New helper - simp... |
1051 |
if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) |
02c24a821 fs: push i_mutex ... |
1052 |
goto out; |
d5aacad54 New helper - simp... |
1053 |
|
c37650161 fs: add sync_inod... |
1054 |
err = sync_inode_metadata(inode, 1); |
d5aacad54 New helper - simp... |
1055 1056 |
if (ret == 0) ret = err; |
ac13a829f fs/libfs.c: add g... |
1057 |
|
02c24a821 fs: push i_mutex ... |
1058 |
out: |
5955102c9 wrappers for ->i_... |
1059 |
inode_unlock(inode); |
383aa543c fs: convert __gen... |
1060 1061 1062 1063 1064 |
/* 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... |
1065 |
} |
ac13a829f fs/libfs.c: add g... |
1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 |
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; |
9398554fb block: remove the... |
1087 |
return blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL); |
ac13a829f fs/libfs.c: add g... |
1088 |
} |
1b061d924 rename the generi... |
1089 |
EXPORT_SYMBOL(generic_file_fsync); |
30ca22c70 ext3/ext4: Factor... |
1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 |
/** * 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 ... |
1102 |
u64 last_fs_page = |
09cbfeaf1 mm, fs: get rid o... |
1103 |
last_fs_block >> (PAGE_SHIFT - blocksize_bits); |
30ca22c70 ext3/ext4: Factor... |
1104 1105 1106 |
if (unlikely(num_blocks == 0)) return 0; |
09cbfeaf1 mm, fs: get rid o... |
1107 |
if ((blocksize_bits < 9) || (blocksize_bits > PAGE_SHIFT)) |
30ca22c70 ext3/ext4: Factor... |
1108 |
return -EINVAL; |
a33f13efe libfs: Fix shift ... |
1109 1110 |
if ((last_fs_block > (sector_t)(~0ULL) >> (blocksize_bits - 9)) || (last_fs_page > (pgoff_t)(~0ULL))) { |
30ca22c70 ext3/ext4: Factor... |
1111 1112 1113 1114 1115 |
return -EFBIG; } return 0; } EXPORT_SYMBOL(generic_check_addressable); |
1b061d924 rename the generi... |
1116 1117 1118 |
/* * No-op implementation of ->fsync for in-memory filesystems. */ |
02c24a821 fs: push i_mutex ... |
1119 |
int noop_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
1b061d924 rename the generi... |
1120 1121 1122 |
{ return 0; } |
1b061d924 rename the generi... |
1123 |
EXPORT_SYMBOL(noop_fsync); |
87dc800be new helper: kfree... |
1124 |
|
f44c77630 fs, dax: prepare ... |
1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 |
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... |
1163 1164 |
/* Because kfree isn't assignment-compatible with void(void*) ;-/ */ void kfree_link(void *p) |
87dc800be new helper: kfree... |
1165 |
{ |
fceef393a switch ->get_link... |
1166 |
kfree(p); |
87dc800be new helper: kfree... |
1167 |
} |
fceef393a switch ->get_link... |
1168 |
EXPORT_SYMBOL(kfree_link); |
6987843ff take anon inode a... |
1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 |
/* * 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... |
1208 |
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
6987843ff take anon inode a... |
1209 1210 1211 |
return inode; } EXPORT_SYMBOL(alloc_anon_inode); |
1c994a090 locks: consolidat... |
1212 1213 1214 1215 1216 1217 |
/** * 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... |
1218 |
* @priv: private data for lm_setup operation |
1c994a090 locks: consolidat... |
1219 1220 1221 1222 1223 |
* * 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... |
1224 1225 |
simple_nosetlease(struct file *filp, long arg, struct file_lock **flp, void **priv) |
1c994a090 locks: consolidat... |
1226 1227 1228 1229 |
{ return -EINVAL; } EXPORT_SYMBOL(simple_nosetlease); |
61ba64fc0 libfs: simple_fol... |
1230 |
|
6ee9706aa libfs: document s... |
1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 |
/** * 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_... |
1245 |
const char *simple_get_link(struct dentry *dentry, struct inode *inode, |
fceef393a switch ->get_link... |
1246 |
struct delayed_call *done) |
61ba64fc0 libfs: simple_fol... |
1247 |
{ |
6b2553918 replace ->follow_... |
1248 |
return inode->i_link; |
61ba64fc0 libfs: simple_fol... |
1249 |
} |
6b2553918 replace ->follow_... |
1250 |
EXPORT_SYMBOL(simple_get_link); |
61ba64fc0 libfs: simple_fol... |
1251 1252 |
const struct inode_operations simple_symlink_inode_operations = { |
6b2553918 replace ->follow_... |
1253 |
.get_link = simple_get_link, |
61ba64fc0 libfs: simple_fol... |
1254 1255 |
}; EXPORT_SYMBOL(simple_symlink_inode_operations); |
fbabfd0f4 fs: Add helper fu... |
1256 1257 1258 1259 1260 1261 1262 1263 |
/* * 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... |
1264 1265 |
static int empty_dir_getattr(const struct path *path, struct kstat *stat, u32 request_mask, unsigned int query_flags) |
fbabfd0f4 fs: Add helper fu... |
1266 |
{ |
a528d35e8 statx: Add a syst... |
1267 |
struct inode *inode = d_inode(path->dentry); |
fbabfd0f4 fs: Add helper fu... |
1268 1269 1270 1271 1272 1273 1274 1275 |
generic_fillattr(inode, stat); return 0; } static int empty_dir_setattr(struct dentry *dentry, struct iattr *attr) { return -EPERM; } |
fbabfd0f4 fs: Add helper fu... |
1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 |
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... |
1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 |
.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... |
1304 |
.iterate_shared = empty_dir_readdir, |
fbabfd0f4 fs: Add helper fu... |
1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 |
.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 ... |
1316 |
inode->i_size = 0; |
fbabfd0f4 fs: Add helper fu... |
1317 1318 1319 1320 |
inode->i_blkbits = PAGE_SHIFT; inode->i_blocks = 0; inode->i_op = &empty_dir_inode_operations; |
f5c244383 libfs: Use IOP_XA... |
1321 |
inode->i_opflags &= ~IOP_XATTR; |
fbabfd0f4 fs: Add helper fu... |
1322 1323 1324 1325 1326 1327 1328 1329 |
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); } |
c843843e7 fs: Add standard ... |
1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 |
#ifdef CONFIG_UNICODE /* * Determine if the name of a dentry should be casefolded. * * Return: if names will need casefolding */ static bool needs_casefold(const struct inode *dir) { return IS_CASEFOLDED(dir) && dir->i_sb->s_encoding; } /** * generic_ci_d_compare - generic d_compare implementation for casefolding filesystems * @dentry: dentry whose name we are checking against * @len: len of name of dentry * @str: str pointer to name of dentry * @name: Name to compare against * * Return: 0 if names match, 1 if mismatch, or -ERRNO */ int generic_ci_d_compare(const struct dentry *dentry, unsigned int len, const char *str, const struct qstr *name) { const struct dentry *parent = READ_ONCE(dentry->d_parent); const struct inode *dir = READ_ONCE(parent->d_inode); const struct super_block *sb = dentry->d_sb; const struct unicode_map *um = sb->s_encoding; struct qstr qstr = QSTR_INIT(str, len); char strbuf[DNAME_INLINE_LEN]; int ret; if (!dir || !needs_casefold(dir)) goto fallback; /* * If the dentry name is stored in-line, then it may be concurrently * modified by a rename. If this happens, the VFS will eventually retry * the lookup, so it doesn't matter what ->d_compare() returns. * However, it's unsafe to call utf8_strncasecmp() with an unstable * string. Therefore, we have to copy the name into a temporary buffer. */ if (len <= DNAME_INLINE_LEN - 1) { memcpy(strbuf, str, len); strbuf[len] = 0; qstr.name = strbuf; /* prevent compiler from optimizing out the temporary buffer */ barrier(); } ret = utf8_strncasecmp(um, name, &qstr); if (ret >= 0) return ret; if (sb_has_strict_encoding(sb)) return -EINVAL; fallback: if (len != name->len) return 1; return !!memcmp(str, name->name, len); } EXPORT_SYMBOL(generic_ci_d_compare); /** * generic_ci_d_hash - generic d_hash implementation for casefolding filesystems * @dentry: dentry of the parent directory * @str: qstr of name whose hash we should fill in * * Return: 0 if hash was successful or unchanged, and -EINVAL on error */ int generic_ci_d_hash(const struct dentry *dentry, struct qstr *str) { const struct inode *dir = READ_ONCE(dentry->d_inode); struct super_block *sb = dentry->d_sb; const struct unicode_map *um = sb->s_encoding; int ret = 0; if (!dir || !needs_casefold(dir)) return 0; ret = utf8_casefold_hash(um, dentry, str); if (ret < 0 && sb_has_strict_encoding(sb)) return -EINVAL; return 0; } EXPORT_SYMBOL(generic_ci_d_hash); #endif |