Hi, Torge.
Please take a look at this patch and check could it solve your problem or not.
Thanks,
Yi.
On 2022/6/30 17:01, Zhang Yi wrote:
> Since commit 6493792d3299 ("ext4: convert symlink external data block
> mapping to bdev"), create new symlink with inline_data is not supported,
> but it missing to handle the leftover inlined symlinks, which could
> cause below error message and fail to read symlink.
>
> ls: cannot read symbolic link 'foo': Structure needs cleaning
>
> EXT4-fs error (device sda): ext4_map_blocks:605: inode #12: block
> 2021161080: comm ls: lblock 0 mapped to illegal pblock 2021161080
> (length 1)
>
> Fix this regression by adding ext4_read_inline_link(), which read the
> inline data directly and convert it through a kmalloced buffer.
>
> Fixes: 6493792d3299 ("ext4: convert symlink external data block mapping to bdev")
> Reported-by: Torge Matthies <openglfreak@xxxxxxxxxxxxxx>
> Signed-off-by: Zhang Yi <yi.zhang@xxxxxxxxxx>
> ---
> fs/ext4/ext4.h | 1 +
> fs/ext4/inline.c | 30 ++++++++++++++++++++++++++++++
> fs/ext4/symlink.c | 15 +++++++++++++++
> 3 files changed, 46 insertions(+)
>
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 75b8d81b2469..adfc30ee4b7b 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -3583,6 +3583,7 @@ extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
> extern int ext4_inline_data_fiemap(struct inode *inode,
> struct fiemap_extent_info *fieinfo,
> int *has_inline, __u64 start, __u64 len);
> +extern void *ext4_read_inline_link(struct inode *inode);
>
> struct iomap;
> extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
> diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
> index cff52ff6549d..1fa36cbe09ec 100644
> --- a/fs/ext4/inline.c
> +++ b/fs/ext4/inline.c
> @@ -6,6 +6,7 @@
>
> #include <linux/iomap.h>
> #include <linux/fiemap.h>
> +#include <linux/namei.h>
> #include <linux/iversion.h>
> #include <linux/sched/mm.h>
>
> @@ -1588,6 +1589,35 @@ int ext4_read_inline_dir(struct file *file,
> return ret;
> }
>
> +void *ext4_read_inline_link(struct inode *inode)
> +{
> + struct ext4_iloc iloc;
> + int ret, inline_size;
> + void *link;
> +
> + ret = ext4_get_inode_loc(inode, &iloc);
> + if (ret)
> + return ERR_PTR(ret);
> +
> + ret = -ENOMEM;
> + inline_size = ext4_get_inline_size(inode);
> + link = kmalloc(inline_size + 1, GFP_NOFS);
> + if (!link)
> + goto out;
> +
> + ret = ext4_read_inline_data(inode, link, inline_size, &iloc);
> + if (ret < 0) {
> + kfree(link);
> + goto out;
> + }
> + nd_terminate_link(link, inode->i_size, ret);
> +out:
> + if (ret < 0)
> + link = ERR_PTR(ret);
> + brelse(iloc.bh);
> + return link;
> +}
> +
> struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
> struct ext4_dir_entry_2 **parent_de,
> int *retval)
> diff --git a/fs/ext4/symlink.c b/fs/ext4/symlink.c
> index d281f5bcc526..3d3ed3c38f56 100644
> --- a/fs/ext4/symlink.c
> +++ b/fs/ext4/symlink.c
> @@ -74,6 +74,21 @@ static const char *ext4_get_link(struct dentry *dentry, struct inode *inode,
> struct delayed_call *callback)
> {
> struct buffer_head *bh;
> + char *inline_link;
> +
> + /*
> + * Create a new inlined symlink is not supported, just provide a
> + * method to read the leftovers.
> + */
> + if (ext4_has_inline_data(inode)) {
> + if (!dentry)
> + return ERR_PTR(-ECHILD);
> +
> + inline_link = ext4_read_inline_link(inode);
> + if (!IS_ERR(inline_link))
> + set_delayed_call(callback, kfree_link, inline_link);
> + return inline_link;
> + }
>
> if (!dentry) {
> bh = ext4_getblk(NULL, inode, 0, EXT4_GET_BLOCKS_CACHED_NOWAIT);
>
