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
138 lines
3.6 KiB
C
138 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* Internal definitions for network filesystem support
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*
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* Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#include <linux/netfs.h>
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#include <linux/fscache.h>
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#include <trace/events/netfs.h>
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#ifdef pr_fmt
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#undef pr_fmt
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#endif
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#define pr_fmt(fmt) "netfs: " fmt
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/*
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* objects.c
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*/
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struct netfs_io_request *netfs_alloc_request(struct address_space *mapping,
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struct file *file,
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loff_t start, size_t len,
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enum netfs_io_origin origin);
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void netfs_get_request(struct netfs_io_request *rreq, enum netfs_rreq_ref_trace what);
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void netfs_clear_subrequests(struct netfs_io_request *rreq, bool was_async);
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void netfs_put_request(struct netfs_io_request *rreq, bool was_async,
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enum netfs_rreq_ref_trace what);
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struct netfs_io_subrequest *netfs_alloc_subrequest(struct netfs_io_request *rreq);
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static inline void netfs_see_request(struct netfs_io_request *rreq,
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enum netfs_rreq_ref_trace what)
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{
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trace_netfs_rreq_ref(rreq->debug_id, refcount_read(&rreq->ref), what);
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}
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/*
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* read_helper.c
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*/
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extern unsigned int netfs_debug;
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void netfs_rreq_work(struct work_struct *work);
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/*
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* stats.c
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*/
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#ifdef CONFIG_NETFS_STATS
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extern atomic_t netfs_n_rh_readahead;
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extern atomic_t netfs_n_rh_readpage;
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extern atomic_t netfs_n_rh_rreq;
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extern atomic_t netfs_n_rh_sreq;
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extern atomic_t netfs_n_rh_download;
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extern atomic_t netfs_n_rh_download_done;
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extern atomic_t netfs_n_rh_download_failed;
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extern atomic_t netfs_n_rh_download_instead;
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extern atomic_t netfs_n_rh_read;
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extern atomic_t netfs_n_rh_read_done;
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extern atomic_t netfs_n_rh_read_failed;
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extern atomic_t netfs_n_rh_zero;
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extern atomic_t netfs_n_rh_short_read;
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extern atomic_t netfs_n_rh_write;
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extern atomic_t netfs_n_rh_write_begin;
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extern atomic_t netfs_n_rh_write_done;
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extern atomic_t netfs_n_rh_write_failed;
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extern atomic_t netfs_n_rh_write_zskip;
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static inline void netfs_stat(atomic_t *stat)
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{
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atomic_inc(stat);
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}
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static inline void netfs_stat_d(atomic_t *stat)
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{
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atomic_dec(stat);
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}
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#else
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#define netfs_stat(x) do {} while(0)
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#define netfs_stat_d(x) do {} while(0)
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#endif
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/*
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* Miscellaneous functions.
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*/
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static inline bool netfs_is_cache_enabled(struct netfs_i_context *ctx)
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{
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#if IS_ENABLED(CONFIG_FSCACHE)
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struct fscache_cookie *cookie = ctx->cache;
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return fscache_cookie_valid(cookie) && cookie->cache_priv &&
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fscache_cookie_enabled(cookie);
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#else
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return false;
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#endif
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}
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/*****************************************************************************/
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/*
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* debug tracing
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*/
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#define dbgprintk(FMT, ...) \
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printk("[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
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#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
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#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
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#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
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#ifdef __KDEBUG
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#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
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#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
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#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
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#elif defined(CONFIG_NETFS_DEBUG)
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#define _enter(FMT, ...) \
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do { \
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if (netfs_debug) \
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kenter(FMT, ##__VA_ARGS__); \
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} while (0)
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#define _leave(FMT, ...) \
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do { \
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if (netfs_debug) \
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kleave(FMT, ##__VA_ARGS__); \
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} while (0)
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#define _debug(FMT, ...) \
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do { \
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if (netfs_debug) \
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kdebug(FMT, ##__VA_ARGS__); \
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} while (0)
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#else
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#define _enter(FMT, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__)
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#define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
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#define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
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#endif
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