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4090b31422
Add a function to do the steps needed to begin a read request, allowing this code to be removed from several other functions and consolidated. Changes ======= ver #2) - Move before the unstaticking patch so that some functions can be left static. - Set uninitialised return code in netfs_begin_read()[1][2]. - Fixed a refleak caused by non-removal of a get from netfs_write_begin() when the request submission code got moved to netfs_begin_read(). - Use INIT_WORK() to (re-)init the request work_struct[3]. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Jeff Layton <jlayton@kernel.org> cc: linux-cachefs@redhat.com Link: https://lore.kernel.org/r/20220303163826.1120936-1-nathan@kernel.org/ [1] Link: https://lore.kernel.org/r/20220303235647.1297171-1-colin.i.king@gmail.com/ [2] Link: https://lore.kernel.org/r/9d69be49081bccff44260e4c6e0049c63d6d04a1.camel@redhat.com/ [3] Link: https://lore.kernel.org/r/164623004355.3564931.7275693529042495641.stgit@warthog.procyon.org.uk/ # v1 Link: https://lore.kernel.org/r/164678214287.1200972.16734134007649832160.stgit@warthog.procyon.org.uk/ # v2 Link: https://lore.kernel.org/r/164692911113.2099075.1060868473229451371.stgit@warthog.procyon.org.uk/ # v3
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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int netfs_begin_read(struct netfs_io_request *rreq, bool sync);
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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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