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g2px1 2025-06-20 21:16:43 +00:00
parent a3b7c416c5
commit c6777ba8c8
1 changed files with 59 additions and 7 deletions
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66
libfs.c
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@ -59,8 +59,10 @@ static ssize_t dummy_write(struct file *file, const char __user *buf, size_t len
struct inode *inode = file_inode(file);
loff_t new_end = *ppos + len;
if (inode->i_size < new_end) inode->i_size = new_end;
*ppos += len;
if (inode->i_size < new_end)
inode->i_size = new_end;
*ppos = new_end;
mark_inode_dirty(inode);
return len;
}
@ -128,20 +130,43 @@ static int books_create(struct user_namespace *ns, struct inode *dir,
return -ENOMEM;
inode->i_uid = current_fsuid();
// inode->i_op = &simple_file_inode_operations;
inode->i_op = &custom_file_inode_operations;
inode->i_fop = &custom_file_ops;
// d_instantiate(dentry, inode);
d_add(dentry, inode);
logf("books_create: dentry addr=%px, inode=%px", dentry, inode);
d_instantiate(dentry, inode);
inc_nlink(inode);
logf("books_create: d_instantiate done, dentry->d_inode=%px", dentry->d_inode);
logf("dentry flags: %u, dentry name: %s", dentry->d_flags, dentry->d_name.name);
mark_inode_dirty(inode);
logf("books_create: created file %s (ino=%lu)", dentry->d_name.name, inode->i_ino);
return 0;
}
#if 0
static struct dentry *books_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) {
logf("books_lookup: looking for %s in ino=%lu", dentry->d_name.name, dir->i_ino);
return simple_lookup(dir, dentry, flags);
}
#endif
static struct dentry *books_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) {
struct dentry *child;
logf("books_lookup: looking for %s in ino=%lu", dentry->d_name.name, dir->i_ino);
child = d_lookup(dentry->d_parent, &dentry->d_name);
if (child) {
d_add(dentry, d_inode(child)); // связываем найденное inode
dput(child);
} else {
d_add(dentry, NULL); // файл не найден
}
return NULL; // всегда возвращается NULL в lookup
}
static const struct inode_operations books_dir_iops = {
.lookup = simple_lookup,
.lookup = books_lookup,
.create = books_create,
};
@ -236,6 +261,7 @@ static int custom_mkdir(struct user_namespace *ns, struct inode *dir, struct den
inode->i_fop = &simple_dir_operations;
d_instantiate(dentry, inode);
inc_nlink(inode);
inc_nlink(dir);
logf("mkdir success: created %s in ino=%lu by uid=%u",
@ -291,6 +317,23 @@ static int custom_link(struct dentry *old_dentry, struct inode *dir, struct dent
return r;
}
static struct dentry *fs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) {
struct dentry *found;
logf("fs_lookup: looking for %s in ino=%lu", dentry->d_name.name, dir->i_ino);
found = d_lookup(dentry->d_parent, &dentry->d_name);
if (found) {
d_add(dentry, d_inode(found));
dput(found);
} else {
d_add(dentry, NULL);
}
return NULL;
}
#if 0
static const struct inode_operations fs_dir_iops = {
.lookup = simple_lookup,
.mkdir = custom_mkdir,
@ -299,6 +342,15 @@ static const struct inode_operations fs_dir_iops = {
.rename = custom_rename,
.link = custom_link,
};
#endif
static const struct inode_operations fs_dir_iops = {
.lookup = fs_lookup,
.mkdir = custom_mkdir,
.unlink = custom_unlink,
.rmdir = custom_rmdir,
.rename = custom_rename,
.link = custom_link,
};
static void evict_inode(struct inode *inode) {
clear_inode(inode);