From 3dd4624ffcd2e6e5d2cee5a6c234774ce27e1f04 Mon Sep 17 00:00:00 2001 From: Christian Brauner Date: Fri, 30 Aug 2024 15:04:56 +0200 Subject: udf: store cookie in private data Store the cookie to detect concurrent seeks on directories in file->private_data. Link: https://lore.kernel.org/r/20240830-vfs-file-f_version-v1-15-6d3e4816aa7b@kernel.org Reviewed-by: Jan Kara Reviewed-by: Jeff Layton Signed-off-by: Christian Brauner --- fs/udf/dir.c | 28 +++++++++++++++++++++++++--- 1 file changed, 25 insertions(+), 3 deletions(-) (limited to 'fs/udf') diff --git a/fs/udf/dir.c b/fs/udf/dir.c index f94f45fe2c91..5023dfe191e8 100644 --- a/fs/udf/dir.c +++ b/fs/udf/dir.c @@ -60,7 +60,7 @@ static int udf_readdir(struct file *file, struct dir_context *ctx) * identifying beginning of dir entry (names are under user control), * we need to scan the directory from the beginning. */ - if (!inode_eq_iversion(dir, file->f_version)) { + if (!inode_eq_iversion(dir, *(u64 *)file->private_data)) { emit_pos = nf_pos; nf_pos = 0; } else { @@ -122,15 +122,37 @@ out_iter: udf_fiiter_release(&iter); out: if (pos_valid) - file->f_version = inode_query_iversion(dir); + *(u64 *)file->private_data = inode_query_iversion(dir); kfree(fname); return ret; } +static int udf_dir_open(struct inode *inode, struct file *file) +{ + file->private_data = kzalloc(sizeof(u64), GFP_KERNEL); + if (!file->private_data) + return -ENOMEM; + return 0; +} + +static int udf_dir_release(struct inode *inode, struct file *file) +{ + kfree(file->private_data); + return 0; +} + +static loff_t udf_dir_llseek(struct file *file, loff_t offset, int whence) +{ + return generic_llseek_cookie(file, offset, whence, + (u64 *)file->private_data); +} + /* readdir and lookup functions */ const struct file_operations udf_dir_operations = { - .llseek = generic_file_llseek, + .open = udf_dir_open, + .release = udf_dir_release, + .llseek = udf_dir_llseek, .read = generic_read_dir, .iterate_shared = udf_readdir, .unlocked_ioctl = udf_ioctl, -- cgit