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now no need to reboot

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g2px1 2025-06-17 18:58:40 +00:00
parent ac32a0a607
commit dd5a0e207c
1 changed files with 57 additions and 46 deletions
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63
statsfs.c
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@ -10,6 +10,7 @@
#include <linux/mm.h> #include <linux/mm.h>
#include <linux/string.h> #include <linux/string.h>
#include <linux/printk.h> #include <linux/printk.h>
#include <linux/uio.h> /* для iov_iter_count() */
#define LIBFS_MAGIC 0xA0B0C0D0 #define LIBFS_MAGIC 0xA0B0C0D0
#define LIBFS_BOOKS_MODE 01777 #define LIBFS_BOOKS_MODE 01777
@ -39,9 +40,26 @@ static int libfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
static int libfs_link(struct dentry *old_dentry, struct inode *dir, static int libfs_link(struct dentry *old_dentry, struct inode *dir,
struct dentry *new_dentry); struct dentry *new_dentry);
/* Обёртки с логированием */
static ssize_t libfs_read_iter(struct kiocb *iocb, struct iov_iter *iter)
{
struct inode *inode = file_inode(iocb->ki_filp);
pr_info("statsfs: READ ino#%lu pos=%lld len=%zu\n",
inode->i_ino, iocb->ki_pos, iov_iter_count(iter));
return generic_file_read_iter(iocb, iter);
}
static ssize_t libfs_write_iter(struct kiocb *iocb, struct iov_iter *iter)
{
struct inode *inode = file_inode(iocb->ki_filp);
pr_info("statsfs: WRITE ino#%lu pos=%lld len=%zu\n",
inode->i_ino, iocb->ki_pos, iov_iter_count(iter));
return generic_file_write_iter(iocb, iter);
}
static const struct file_operations libfs_file_ops = { static const struct file_operations libfs_file_ops = {
.read_iter = generic_file_read_iter, .read_iter = libfs_read_iter,
.write_iter = generic_file_write_iter, .write_iter = libfs_write_iter,
.llseek = generic_file_llseek, .llseek = generic_file_llseek,
}; };
@ -58,8 +76,8 @@ static const struct inode_operations libfs_dir_iops = {
.rmdir = libfs_rmdir, .rmdir = libfs_rmdir,
.rename = libfs_rename, .rename = libfs_rename,
.link = libfs_link, .link = libfs_link,
.mknod = NULL, /* запрещаем */ .mknod = NULL,
.symlink = NULL, /* запрещаем */ .symlink = NULL,
}; };
static const struct super_operations statsfs_sops = { static const struct super_operations statsfs_sops = {
@ -71,14 +89,13 @@ static const struct super_operations statsfs_sops = {
static struct inode *libfs_get_inode(struct super_block *sb, umode_t mode) static struct inode *libfs_get_inode(struct super_block *sb, umode_t mode)
{ {
struct inode *inode; struct inode *inode;
pr_info("statsfs: libfs_get_inode(sb=%p, mode=%o)\n", sb, mode); pr_info("statsfs: libfs_get_inode(sb=%p, mode=%o)\n", sb, mode);
inode = new_inode(sb); inode = new_inode(sb);
if (!inode) { if (!inode) {
pr_err("statsfs: new_inode failed for mode %o\n", mode); pr_err("statsfs: new_inode failed for mode %o\n", mode);
return NULL; return NULL;
} }
inode->i_ino = get_next_ino(); inode->i_ino = get_next_ino();
inode->i_sb = sb; inode->i_sb = sb;
inode->i_mode = mode; inode->i_mode = mode;
@ -90,7 +107,6 @@ static struct inode *libfs_get_inode(struct super_block *sb, umode_t mode)
} else { } else {
inode->i_op = &libfs_file_iops; inode->i_op = &libfs_file_iops;
inode->i_fop = &libfs_file_ops; inode->i_fop = &libfs_file_ops;
inode->i_private = kzalloc(sizeof(struct hlist_head), GFP_KERNEL); inode->i_private = kzalloc(sizeof(struct hlist_head), GFP_KERNEL);
if (!inode->i_private) { if (!inode->i_private) {
pr_err("statsfs: kzalloc for inode #%lu failed\n", inode->i_ino); pr_err("statsfs: kzalloc for inode #%lu failed\n", inode->i_ino);
@ -98,9 +114,9 @@ static struct inode *libfs_get_inode(struct super_block *sb, umode_t mode)
return NULL; return NULL;
} }
INIT_HLIST_HEAD((struct hlist_head *)inode->i_private); INIT_HLIST_HEAD((struct hlist_head *)inode->i_private);
pr_info("statsfs: created file inode #%lu with private list\n", inode->i_ino); pr_info("statsfs: created file inode #%lu with private list\n",
inode->i_ino);
} }
return inode; return inode;
} }
@ -118,18 +134,17 @@ static void cleanup_links(struct inode *victim)
hlist_for_each_entry_safe(le, tmp, list, node) { hlist_for_each_entry_safe(le, tmp, list, node) {
struct dentry *link = le->link; struct dentry *link = le->link;
struct dentry *pd;
struct inode *parent;
if (!link || d_unlinked(link)) { if (!link || d_unlinked(link)) {
pr_info("statsfs: link already gone, freeing entry\n"); pr_info("statsfs: link gone, freeing entry\n");
hlist_del(&le->node); hlist_del(&le->node);
dput(link); dput(link);
kfree(le); kfree(le);
continue; continue;
} }
pd = dget_parent(link); {
struct dentry *pd = dget_parent(link);
struct inode *parent;
if (pd) { if (pd) {
parent = d_inode(pd); parent = d_inode(pd);
if (WARN_ON(!parent)) if (WARN_ON(!parent))
@ -141,7 +156,7 @@ static void cleanup_links(struct inode *victim)
link, parent->i_ino); link, parent->i_ino);
dput(pd); dput(pd);
} }
}
skip_unlink: skip_unlink:
hlist_del(&le->node); hlist_del(&le->node);
dput(link); dput(link);
@ -162,7 +177,6 @@ static int libfs_create(struct mnt_idmap *idmap, struct inode *dir,
struct dentry *dentry, umode_t mode, bool excl) struct dentry *dentry, umode_t mode, bool excl)
{ {
struct inode *inode; struct inode *inode;
pr_info("statsfs: CREATE %pd in dir inode #%lu mode=%o\n", pr_info("statsfs: CREATE %pd in dir inode #%lu mode=%o\n",
dentry, dir->i_ino, mode); dentry, dir->i_ino, mode);
if (dir != books_inode) if (dir != books_inode)
@ -175,7 +189,8 @@ static int libfs_create(struct mnt_idmap *idmap, struct inode *dir,
inode->i_uid = current_fsuid(); inode->i_uid = current_fsuid();
inode->i_gid = current_fsgid(); inode->i_gid = current_fsgid();
d_add(dentry, inode); d_add(dentry, inode);
pr_info("statsfs: added file %pd as inode #%lu\n", dentry, inode->i_ino); pr_info("statsfs: added file %pd as inode #%lu\n",
dentry, inode->i_ino);
return 0; return 0;
} }
@ -183,16 +198,14 @@ static int libfs_unlink(struct inode *dir, struct dentry *dentry)
{ {
struct inode *victim = d_inode(dentry); struct inode *victim = d_inode(dentry);
int err; int err;
pr_info("statsfs: UNLINK %pd from dir inode #%lu\n", pr_info("statsfs: UNLINK %pd from dir inode #%lu\n",
dentry, dir->i_ino); dentry, dir->i_ino);
if (dir == libfs_sb->s_root->d_inode && is_protected(dentry)) if (dir == libfs_sb->s_root->d_inode && is_protected(dentry))
return -EPERM; return -EPERM;
err = simple_unlink(dir, dentry); err = simple_unlink(dir, dentry);
if (!err && dir == books_inode) { if (!err && dir == books_inode)
cleanup_links(victim); cleanup_links(victim);
}
return err; return err;
} }
@ -200,7 +213,6 @@ static int libfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
struct dentry *dentry, umode_t mode) struct dentry *dentry, umode_t mode)
{ {
struct inode *inode; struct inode *inode;
pr_info("statsfs: MKDIR %pd in dir inode #%lu\n", pr_info("statsfs: MKDIR %pd in dir inode #%lu\n",
dentry, dir->i_ino); dentry, dir->i_ino);
if (dir == libfs_sb->s_root->d_inode || dir == books_inode) if (dir == libfs_sb->s_root->d_inode || dir == books_inode)
@ -215,7 +227,8 @@ static int libfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
inode->i_uid = current_fsuid(); inode->i_uid = current_fsuid();
d_add(dentry, inode); d_add(dentry, inode);
inc_nlink(dir); inc_nlink(dir);
pr_info("statsfs: created subdir %pd as inode #%lu\n", dentry, inode->i_ino); pr_info("statsfs: created subdir %pd as inode #%lu\n",
dentry, inode->i_ino);
return 0; return 0;
} }
@ -250,7 +263,6 @@ static int libfs_link(struct dentry *old_dentry, struct inode *dir,
struct inode *t = d_inode(old_dentry); struct inode *t = d_inode(old_dentry);
struct link_entry *le; struct link_entry *le;
int err; int err;
pr_info("statsfs: LINK %pd -> %pd in dir inode #%lu\n", pr_info("statsfs: LINK %pd -> %pd in dir inode #%lu\n",
old_dentry, new_dentry, dir->i_ino); old_dentry, new_dentry, dir->i_ino);
if (!S_ISREG(t->i_mode)) if (!S_ISREG(t->i_mode))
@ -276,7 +288,6 @@ static int libfs_link(struct dentry *old_dentry, struct inode *dir,
static int libfs_fill_super(struct super_block *sb, void *data, int silent) static int libfs_fill_super(struct super_block *sb, void *data, int silent)
{ {
struct inode *root; struct inode *root;
pr_info("statsfs: fill_super\n"); pr_info("statsfs: fill_super\n");
libfs_sb = sb; libfs_sb = sb;
sb->s_magic = LIBFS_MAGIC; sb->s_magic = LIBFS_MAGIC;
@ -312,7 +323,7 @@ static struct dentry *libfs_mount(struct file_system_type *fs,
static void libfs_evict_inode(struct inode *inode) static void libfs_evict_inode(struct inode *inode)
{ {
pr_info("statsfs: evict_inode inode #%lu\n", inode->i_ino); pr_info("statsfs: evict_inode ino#%lu\n", inode->i_ino);
truncate_inode_pages_final(&inode->i_data); truncate_inode_pages_final(&inode->i_data);
cleanup_links(inode); cleanup_links(inode);
clear_inode(inode); clear_inode(inode);
@ -320,7 +331,7 @@ static void libfs_evict_inode(struct inode *inode)
static struct file_system_type libfs_type = { static struct file_system_type libfs_type = {
.owner = THIS_MODULE, .owner = THIS_MODULE,
.name = "libfs", .name = "statsfs",
.mount = libfs_mount, .mount = libfs_mount,
.kill_sb = kill_litter_super, .kill_sb = kill_litter_super,
}; };