now no need to reboot
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ac32a0a607
commit
dd5a0e207c
103
statsfs.c
103
statsfs.c
@ -10,6 +10,7 @@
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/printk.h>
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#include <linux/uio.h> /* для iov_iter_count() */
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#define LIBFS_MAGIC 0xA0B0C0D0
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#define LIBFS_BOOKS_MODE 01777
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@ -39,9 +40,26 @@ static int libfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
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static int libfs_link(struct dentry *old_dentry, struct inode *dir,
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struct dentry *new_dentry);
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/* Обёртки с логированием */
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static ssize_t libfs_read_iter(struct kiocb *iocb, struct iov_iter *iter)
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{
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struct inode *inode = file_inode(iocb->ki_filp);
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pr_info("statsfs: READ ino#%lu pos=%lld len=%zu\n",
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inode->i_ino, iocb->ki_pos, iov_iter_count(iter));
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return generic_file_read_iter(iocb, iter);
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}
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static ssize_t libfs_write_iter(struct kiocb *iocb, struct iov_iter *iter)
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{
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struct inode *inode = file_inode(iocb->ki_filp);
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pr_info("statsfs: WRITE ino#%lu pos=%lld len=%zu\n",
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inode->i_ino, iocb->ki_pos, iov_iter_count(iter));
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return generic_file_write_iter(iocb, iter);
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}
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static const struct file_operations libfs_file_ops = {
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.read_iter = generic_file_read_iter,
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.write_iter = generic_file_write_iter,
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.read_iter = libfs_read_iter,
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.write_iter = libfs_write_iter,
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.llseek = generic_file_llseek,
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};
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@ -58,8 +76,8 @@ static const struct inode_operations libfs_dir_iops = {
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.rmdir = libfs_rmdir,
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.rename = libfs_rename,
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.link = libfs_link,
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.mknod = NULL, /* запрещаем */
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.symlink = NULL, /* запрещаем */
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.mknod = NULL,
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.symlink = NULL,
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};
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static const struct super_operations statsfs_sops = {
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@ -71,26 +89,24 @@ static const struct super_operations statsfs_sops = {
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static struct inode *libfs_get_inode(struct super_block *sb, umode_t mode)
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{
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struct inode *inode;
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pr_info("statsfs: libfs_get_inode(sb=%p, mode=%o)\n", sb, mode);
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inode = new_inode(sb);
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if (!inode) {
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pr_err("statsfs: new_inode failed for mode %o\n", mode);
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return NULL;
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}
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inode->i_ino = get_next_ino();
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inode->i_sb = sb;
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inode->i_mode = mode;
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inode->i_ino = get_next_ino();
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inode->i_sb = sb;
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inode->i_mode = mode;
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if (S_ISDIR(mode)) {
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inode->i_op = &libfs_dir_iops;
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inode->i_fop = &simple_dir_operations;
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pr_info("statsfs: created dir inode #%lu\n", inode->i_ino);
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} else {
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inode->i_op = &libfs_file_iops;
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inode->i_fop = &libfs_file_ops;
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inode->i_op = &libfs_file_iops;
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inode->i_fop = &libfs_file_ops;
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inode->i_private = kzalloc(sizeof(struct hlist_head), GFP_KERNEL);
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if (!inode->i_private) {
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pr_err("statsfs: kzalloc for inode #%lu failed\n", inode->i_ino);
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@ -98,9 +114,9 @@ static struct inode *libfs_get_inode(struct super_block *sb, umode_t mode)
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return NULL;
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}
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INIT_HLIST_HEAD((struct hlist_head *)inode->i_private);
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pr_info("statsfs: created file inode #%lu with private list\n", inode->i_ino);
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pr_info("statsfs: created file inode #%lu with private list\n",
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inode->i_ino);
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}
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return inode;
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}
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@ -118,30 +134,29 @@ static void cleanup_links(struct inode *victim)
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hlist_for_each_entry_safe(le, tmp, list, node) {
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struct dentry *link = le->link;
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struct dentry *pd;
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struct inode *parent;
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if (!link || d_unlinked(link)) {
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pr_info("statsfs: link already gone, freeing entry\n");
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pr_info("statsfs: link gone, freeing entry\n");
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hlist_del(&le->node);
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dput(link);
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kfree(le);
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continue;
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}
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pd = dget_parent(link);
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if (pd) {
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parent = d_inode(pd);
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if (WARN_ON(!parent))
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goto skip_unlink;
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inode_lock(parent);
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vfs_unlink(NULL, parent, link, NULL);
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inode_unlock(parent);
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pr_info("statsfs: unlinked %pd from parent inode #%lu\n",
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link, parent->i_ino);
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dput(pd);
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{
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struct dentry *pd = dget_parent(link);
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struct inode *parent;
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if (pd) {
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parent = d_inode(pd);
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if (WARN_ON(!parent))
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goto skip_unlink;
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inode_lock(parent);
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vfs_unlink(NULL, parent, link, NULL);
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inode_unlock(parent);
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pr_info("statsfs: unlinked %pd from parent inode #%lu\n",
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link, parent->i_ino);
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dput(pd);
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}
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}
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skip_unlink:
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hlist_del(&le->node);
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dput(link);
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@ -162,7 +177,6 @@ static int libfs_create(struct mnt_idmap *idmap, struct inode *dir,
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struct dentry *dentry, umode_t mode, bool excl)
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{
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struct inode *inode;
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pr_info("statsfs: CREATE %pd in dir inode #%lu mode=%o\n",
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dentry, dir->i_ino, mode);
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if (dir != books_inode)
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@ -175,7 +189,8 @@ static int libfs_create(struct mnt_idmap *idmap, struct inode *dir,
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inode->i_uid = current_fsuid();
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inode->i_gid = current_fsgid();
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d_add(dentry, inode);
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pr_info("statsfs: added file %pd as inode #%lu\n", dentry, inode->i_ino);
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pr_info("statsfs: added file %pd as inode #%lu\n",
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dentry, inode->i_ino);
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return 0;
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}
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@ -183,16 +198,14 @@ static int libfs_unlink(struct inode *dir, struct dentry *dentry)
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{
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struct inode *victim = d_inode(dentry);
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int err;
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pr_info("statsfs: UNLINK %pd from dir inode #%lu\n",
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dentry, dir->i_ino);
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if (dir == libfs_sb->s_root->d_inode && is_protected(dentry))
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return -EPERM;
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err = simple_unlink(dir, dentry);
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if (!err && dir == books_inode) {
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if (!err && dir == books_inode)
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cleanup_links(victim);
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}
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return err;
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}
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@ -200,7 +213,6 @@ static int libfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
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struct dentry *dentry, umode_t mode)
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{
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struct inode *inode;
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pr_info("statsfs: MKDIR %pd in dir inode #%lu\n",
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dentry, dir->i_ino);
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if (dir == libfs_sb->s_root->d_inode || dir == books_inode)
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@ -215,7 +227,8 @@ static int libfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
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inode->i_uid = current_fsuid();
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d_add(dentry, inode);
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inc_nlink(dir);
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pr_info("statsfs: created subdir %pd as inode #%lu\n", dentry, inode->i_ino);
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pr_info("statsfs: created subdir %pd as inode #%lu\n",
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dentry, inode->i_ino);
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return 0;
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}
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@ -234,7 +247,7 @@ static int libfs_rename(struct mnt_idmap *idmap, struct inode *odir,
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struct dentry *odent, struct inode *ndir,
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struct dentry *ndent, unsigned int flags)
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{
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pr_info("statsfs: RENAME %pd (ino#%lu) -> %pd (ino#%lu)\n",
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pr_info("statsfs: RENAME %pd(ino#%lu) -> %pd(ino#%lu)\n",
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odent, odir->i_ino, ndent, ndir->i_ino);
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if ((odir == libfs_sb->s_root->d_inode || ndir == libfs_sb->s_root->d_inode) &&
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(is_protected(odent) || is_protected(ndent)))
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@ -250,7 +263,6 @@ static int libfs_link(struct dentry *old_dentry, struct inode *dir,
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struct inode *t = d_inode(old_dentry);
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struct link_entry *le;
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int err;
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pr_info("statsfs: LINK %pd -> %pd in dir inode #%lu\n",
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old_dentry, new_dentry, dir->i_ino);
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if (!S_ISREG(t->i_mode))
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@ -276,11 +288,10 @@ static int libfs_link(struct dentry *old_dentry, struct inode *dir,
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static int libfs_fill_super(struct super_block *sb, void *data, int silent)
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{
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struct inode *root;
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pr_info("statsfs: fill_super\n");
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libfs_sb = sb;
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sb->s_magic = LIBFS_MAGIC;
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sb->s_op = &statsfs_sops;
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libfs_sb = sb;
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sb->s_magic = LIBFS_MAGIC;
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sb->s_op = &statsfs_sops;
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root = libfs_get_inode(sb, S_IFDIR | 0755);
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if (!root)
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@ -312,7 +323,7 @@ static struct dentry *libfs_mount(struct file_system_type *fs,
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static void libfs_evict_inode(struct inode *inode)
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{
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pr_info("statsfs: evict_inode inode #%lu\n", inode->i_ino);
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pr_info("statsfs: evict_inode ino#%lu\n", inode->i_ino);
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truncate_inode_pages_final(&inode->i_data);
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cleanup_links(inode);
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clear_inode(inode);
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@ -320,7 +331,7 @@ static void libfs_evict_inode(struct inode *inode)
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static struct file_system_type libfs_type = {
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.owner = THIS_MODULE,
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.name = "libfs",
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.name = "statsfs",
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.mount = libfs_mount,
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.kill_sb = kill_litter_super,
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};
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@ -346,4 +357,4 @@ module_exit(libfs_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("you");
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MODULE_DESCRIPTION("Custom library FS with books and authors (with debug logs)");
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MODULE_DESCRIPTION("Custom library FS with books and authors (with debug logs)");
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