From: Jeff Layton <jlayton@redhat.com>
To: David Howells <dhowells@redhat.com>, linux-fsdevel@vger.kernel.org
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
Anna Schumaker <anna.schumaker@netapp.com>,
Steve French <sfrench@samba.org>,
Dominique Martinet <asmadeus@codewreck.org>,
Mike Marshall <hubcap@omnibond.com>,
David Wysochanski <dwysocha@redhat.com>,
Shyam Prasad N <nspmangalore@gmail.com>,
Miklos Szeredi <miklos@szeredi.hu>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-cachefs@redhat.com, linux-afs@lists.infradead.org,
linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org,
ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net,
devel@lists.orangefs.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 01/12] afs: Sort out symlink reading
Date: Wed, 21 Jul 2021 12:20:42 -0400 [thread overview]
Message-ID: <35ecb577315f486f1636b2316c2051ad004f6f7b.camel@redhat.com> (raw)
In-Reply-To: <162687508008.276387.6418924257569297305.stgit@warthog.procyon.org.uk>
On Wed, 2021-07-21 at 14:44 +0100, David Howells wrote:
> afs_readpage() doesn't get a file pointer when called for a symlink, so
> separate it from regular file pointer handling.
>
> Signed-off-by: David Howells <dhowells@redhat.com>
> ---
>
> fs/afs/file.c | 14 +++++++++-----
> fs/afs/inode.c | 6 +++---
> fs/afs/internal.h | 3 ++-
> 3 files changed, 14 insertions(+), 9 deletions(-)
>
> diff --git a/fs/afs/file.c b/fs/afs/file.c
> index ca0d993add65..c9c21ad0e7c9 100644
> --- a/fs/afs/file.c
> +++ b/fs/afs/file.c
> @@ -19,6 +19,7 @@
>
> static int afs_file_mmap(struct file *file, struct vm_area_struct *vma);
> static int afs_readpage(struct file *file, struct page *page);
> +static int afs_symlink_readpage(struct file *file, struct page *page);
> static void afs_invalidatepage(struct page *page, unsigned int offset,
> unsigned int length);
> static int afs_releasepage(struct page *page, gfp_t gfp_flags);
> @@ -46,7 +47,7 @@ const struct inode_operations afs_file_inode_operations = {
> .permission = afs_permission,
> };
>
> -const struct address_space_operations afs_fs_aops = {
> +const struct address_space_operations afs_file_aops = {
> .readpage = afs_readpage,
> .readahead = afs_readahead,
> .set_page_dirty = afs_set_page_dirty,
> @@ -60,6 +61,12 @@ const struct address_space_operations afs_fs_aops = {
> .writepages = afs_writepages,
> };
>
> +const struct address_space_operations afs_symlink_aops = {
> + .readpage = afs_symlink_readpage,
> + .releasepage = afs_releasepage,
> + .invalidatepage = afs_invalidatepage,
> +};
> +
> static const struct vm_operations_struct afs_vm_ops = {
> .fault = filemap_fault,
> .map_pages = filemap_map_pages,
> @@ -321,7 +328,7 @@ static void afs_req_issue_op(struct netfs_read_subrequest *subreq)
> afs_fetch_data(fsreq->vnode, fsreq);
> }
>
> -static int afs_symlink_readpage(struct page *page)
> +static int afs_symlink_readpage(struct file *file, struct page *page)
> {
> struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
> struct afs_read *fsreq;
I wonder...would you be better served here by not using page_readlink
for symlinks and instead use simple_get_link and roll your own readlink
operation. It seems a bit more direct, and AFS seems to be the only
caller of page_readlink.
> @@ -386,9 +393,6 @@ const struct netfs_read_request_ops afs_req_ops = {
>
> static int afs_readpage(struct file *file, struct page *page)
> {
> - if (!file)
> - return afs_symlink_readpage(page);
> -
> return netfs_readpage(file, page, &afs_req_ops, NULL);
> }
>
> diff --git a/fs/afs/inode.c b/fs/afs/inode.c
> index bef6f5ccfb09..cf7b66957c6f 100644
> --- a/fs/afs/inode.c
> +++ b/fs/afs/inode.c
> @@ -105,7 +105,7 @@ static int afs_inode_init_from_status(struct afs_operation *op,
> inode->i_mode = S_IFREG | (status->mode & S_IALLUGO);
> inode->i_op = &afs_file_inode_operations;
> inode->i_fop = &afs_file_operations;
> - inode->i_mapping->a_ops = &afs_fs_aops;
> + inode->i_mapping->a_ops = &afs_file_aops;
> break;
> case AFS_FTYPE_DIR:
> inode->i_mode = S_IFDIR | (status->mode & S_IALLUGO);
> @@ -123,11 +123,11 @@ static int afs_inode_init_from_status(struct afs_operation *op,
> inode->i_mode = S_IFDIR | 0555;
> inode->i_op = &afs_mntpt_inode_operations;
> inode->i_fop = &afs_mntpt_file_operations;
> - inode->i_mapping->a_ops = &afs_fs_aops;
> + inode->i_mapping->a_ops = &afs_symlink_aops;
> } else {
> inode->i_mode = S_IFLNK | status->mode;
> inode->i_op = &afs_symlink_inode_operations;
> - inode->i_mapping->a_ops = &afs_fs_aops;
> + inode->i_mapping->a_ops = &afs_symlink_aops;
> }
> inode_nohighmem(inode);
> break;
> diff --git a/fs/afs/internal.h b/fs/afs/internal.h
> index 791cf02e5696..ccdde00ada8a 100644
> --- a/fs/afs/internal.h
> +++ b/fs/afs/internal.h
> @@ -1050,7 +1050,8 @@ extern void afs_dynroot_depopulate(struct super_block *);
> /*
> * file.c
> */
> -extern const struct address_space_operations afs_fs_aops;
> +extern const struct address_space_operations afs_file_aops;
> +extern const struct address_space_operations afs_symlink_aops;
> extern const struct inode_operations afs_file_inode_operations;
> extern const struct file_operations afs_file_operations;
> extern const struct netfs_read_request_ops afs_req_ops;
>
>
Regardless, this is more reasonable than what's there now.
Reviewed-by: Jeff Layton <jlayton@redhat.com>
next prev parent reply other threads:[~2021-07-21 16:20 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-21 13:44 David Howells
2021-07-21 13:44 ` [RFC PATCH 01/12] afs: Sort out symlink reading David Howells
2021-07-21 16:20 ` Jeff Layton [this message]
2021-07-26 9:44 ` David Howells
2021-07-21 13:44 ` [RFC PATCH 02/12] netfs: Add an iov_iter to the read subreq for the network fs/cache to use David Howells
2021-07-21 17:16 ` Jeff Layton
2021-07-21 17:20 ` David Howells
2021-07-21 13:45 ` [RFC PATCH 03/12] netfs: Remove netfs_read_subrequest::transferred David Howells
2021-07-21 17:43 ` Jeff Layton
2021-07-21 18:54 ` David Howells
2021-07-21 19:00 ` Jeff Layton
2021-07-21 13:45 ` [RFC PATCH 04/12] netfs: Use a buffer in netfs_read_request and add pages to it David Howells
2021-07-21 13:45 ` [RFC PATCH 05/12] netfs: Add a netfs inode context David Howells
2021-07-21 13:46 ` [RFC PATCH 06/12] netfs: Keep lists of pending, active, dirty and flushed regions David Howells
2021-07-21 13:46 ` [RFC PATCH 07/12] netfs: Initiate write request from a dirty region David Howells
2021-07-21 13:46 ` [RFC PATCH 08/12] netfs: Keep dirty mark for pages with more than one " David Howells
2021-07-21 13:46 ` [RFC PATCH 09/12] netfs: Send write request to multiple destinations David Howells
2021-07-21 13:46 ` [RFC PATCH 10/12] netfs: Do encryption in write preparatory phase David Howells
2021-07-21 13:47 ` [RFC PATCH 11/12] netfs: Put a list of regions in /proc/fs/netfs/regions David Howells
2021-07-21 13:47 ` [RFC PATCH 12/12] netfs: Export some read-request ref functions David Howells
2021-07-21 14:00 ` [RFC PATCH 00/12] netfs: Experimental write helpers, fscrypt and compression David Howells
2021-07-21 18:42 ` [RFC PATCH 13/12] netfs: Do copy-to-cache-on-read through VM writeback David Howells
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=35ecb577315f486f1636b2316c2051ad004f6f7b.camel@redhat.com \
--to=jlayton@redhat.com \
--cc=anna.schumaker@netapp.com \
--cc=asmadeus@codewreck.org \
--cc=ceph-devel@vger.kernel.org \
--cc=devel@lists.orangefs.org \
--cc=dhowells@redhat.com \
--cc=dwysocha@redhat.com \
--cc=hubcap@omnibond.com \
--cc=linux-afs@lists.infradead.org \
--cc=linux-cachefs@redhat.com \
--cc=linux-cifs@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-nfs@vger.kernel.org \
--cc=miklos@szeredi.hu \
--cc=nspmangalore@gmail.com \
--cc=sfrench@samba.org \
--cc=torvalds@linux-foundation.org \
--cc=v9fs-developer@lists.sourceforge.net \
--cc=willy@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).