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bc899ee1c8
Add a netfs_i_context struct that should be included in the network
filesystem's own inode struct wrapper, directly after the VFS's inode
struct, e.g.:
struct my_inode {
struct {
/* These must be contiguous */
struct inode vfs_inode;
struct netfs_i_context netfs_ctx;
};
};
The netfs_i_context struct so far contains a single field for the network
filesystem to use - the cache cookie:
struct netfs_i_context {
...
struct fscache_cookie *cache;
};
Three functions are provided to help with this:
(1) void netfs_i_context_init(struct inode *inode,
const struct netfs_request_ops *ops);
Initialise the netfs context and set the operations.
(2) struct netfs_i_context *netfs_i_context(struct inode *inode);
Find the netfs context from the VFS inode.
(3) struct inode *netfs_inode(struct netfs_i_context *ctx);
Find the VFS inode from the netfs context.
Changes
=======
ver #4)
- Fix netfs_is_cache_enabled() to check cookie->cache_priv to see if a
cache is present[3].
- Fix netfs_skip_folio_read() to zero out all of the page, not just some
of it[3].
ver #3)
- Split out the bit to move ceph cap-getting on readahead into
ceph_init_request()[1].
- Stick in a comment to the netfs inode structs indicating the contiguity
requirements[2].
ver #2)
- Adjust documentation to match.
- Use "#if IS_ENABLED()" in netfs_i_cookie(), not "#ifdef".
- Move the cap check from ceph_readahead() to ceph_init_request() to be
called from netfslib.
- Remove ceph_readahead() and use netfs_readahead() directly instead.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
Link: https://lore.kernel.org/r/8af0d47f17d89c06bbf602496dd845f2b0bf25b3.camel@kernel.org/ [1]
Link: https://lore.kernel.org/r/beaf4f6a6c2575ed489adb14b257253c868f9a5c.camel@kernel.org/ [2]
Link: https://lore.kernel.org/r/3536452.1647421585@warthog.procyon.org.uk/ [3]
Link: https://lore.kernel.org/r/164622984545.3564931.15691742939278418580.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/164678213320.1200972.16807551936267647470.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/164692909854.2099075.9535537286264248057.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/306388.1647595110@warthog.procyon.org.uk/ # v4
75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* V9FS cache definitions.
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*
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* Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu>
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*/
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#include <linux/jiffies.h>
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#include <linux/file.h>
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#include <linux/slab.h>
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#include <linux/stat.h>
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <net/9p/9p.h>
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#include "v9fs.h"
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#include "cache.h"
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int v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses,
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const char *dev_name)
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{
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struct fscache_volume *vcookie;
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char *name, *p;
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name = kasprintf(GFP_KERNEL, "9p,%s,%s",
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dev_name, v9ses->cachetag ?: v9ses->aname);
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if (!name)
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return -ENOMEM;
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for (p = name; *p; p++)
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if (*p == '/')
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*p = ';';
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vcookie = fscache_acquire_volume(name, NULL, NULL, 0);
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p9_debug(P9_DEBUG_FSC, "session %p get volume %p (%s)\n",
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v9ses, vcookie, name);
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if (IS_ERR(vcookie)) {
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if (vcookie != ERR_PTR(-EBUSY)) {
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kfree(name);
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return PTR_ERR(vcookie);
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}
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pr_err("Cache volume key already in use (%s)\n", name);
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vcookie = NULL;
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}
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v9ses->fscache = vcookie;
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kfree(name);
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return 0;
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}
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void v9fs_cache_inode_get_cookie(struct inode *inode)
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{
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struct v9fs_inode *v9inode = V9FS_I(inode);
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struct v9fs_session_info *v9ses;
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__le32 version;
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__le64 path;
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if (!S_ISREG(inode->i_mode))
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return;
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if (WARN_ON(v9fs_inode_cookie(v9inode)))
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return;
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version = cpu_to_le32(v9inode->qid.version);
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path = cpu_to_le64(v9inode->qid.path);
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v9ses = v9fs_inode2v9ses(inode);
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v9inode->netfs_ctx.cache =
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fscache_acquire_cookie(v9fs_session_cache(v9ses),
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0,
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&path, sizeof(path),
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&version, sizeof(version),
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i_size_read(&v9inode->vfs_inode));
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p9_debug(P9_DEBUG_FSC, "inode %p get cookie %p\n",
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inode, v9fs_inode_cookie(v9inode));
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}
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