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libfs: Add directory operations for stable offsets

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Create a vector of directory operations in fs/libfs.c that handles
directory seeks and readdir via stable offsets instead of the
current cursor-based mechanism.

For the moment these are unused.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Message-Id: <168814732984.530310.11190772066786107220.stgit@manet.1015granger.net>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Chuck Lever
2023-06-30 13:48:49 -04:00
committed by Christian Brauner
parent 509f006932
commit 6faddda69f
4 changed files with 276 additions and 4 deletions
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18
include/linux/fs.h
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@@ -1770,6 +1770,7 @@ struct dir_context {
struct iov_iter;
struct io_uring_cmd;
struct offset_ctx;
struct file_operations {
struct module *owner;
@@ -1857,6 +1858,7 @@ struct inode_operations {
int (*fileattr_set)(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa);
int (*fileattr_get)(struct dentry *dentry, struct fileattr *fa);
struct offset_ctx *(*get_offset_ctx)(struct inode *inode);
} ____cacheline_aligned;
static inline ssize_t call_read_iter(struct file *file, struct kiocb *kio,
@@ -2971,6 +2973,22 @@ extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
const void __user *from, size_t count);
struct offset_ctx {
struct xarray xa;
u32 next_offset;
};
void simple_offset_init(struct offset_ctx *octx);
int simple_offset_add(struct offset_ctx *octx, struct dentry *dentry);
void simple_offset_remove(struct offset_ctx *octx, struct dentry *dentry);
int simple_offset_rename_exchange(struct inode *old_dir,
struct dentry *old_dentry,
struct inode *new_dir,
struct dentry *new_dentry);
void simple_offset_destroy(struct offset_ctx *octx);
extern const struct file_operations simple_offset_dir_operations;
extern int __generic_file_fsync(struct file *, loff_t, loff_t, int);
extern int generic_file_fsync(struct file *, loff_t, loff_t, int);