path: root/fs/ceph/super.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _FS_CEPH_SUPER_H
#define _FS_CEPH_SUPER_H

#include <linux/ceph/ceph_debug.h>

#include <asm/unaligned.h>
#include <linux/backing-dev.h>
#include <linux/completion.h>
#include <linux/exportfs.h>
#include <linux/fs.h>
#include <linux/mempool.h>
#include <linux/pagemap.h>
#include <linux/wait.h>
#include <linux/writeback.h>
#include <linux/slab.h>
#include <linux/posix_acl.h>
#include <linux/refcount.h>
#include <linux/security.h>
#include <linux/netfs.h>
#include <linux/fscache.h>
#include <linux/hashtable.h>

#include <linux/ceph/libceph.h>

/* large granularity for statfs utilization stats to facilitate
 * large volume sizes on 32-bit machines. */
#define CEPH_BLOCK_SHIFT   22  /* 4 MB */
#define CEPH_BLOCK         (1 << CEPH_BLOCK_SHIFT)
#define CEPH_4K_BLOCK_SHIFT 12  /* 4 KB */

#define CEPH_MOUNT_OPT_CLEANRECOVER    (1<<1) /* auto reonnect (clean mode) after blocklisted */
#define CEPH_MOUNT_OPT_DIRSTAT         (1<<4) /* `cat dirname` for stats */
#define CEPH_MOUNT_OPT_RBYTES          (1<<5) /* dir st_bytes = rbytes */
#define CEPH_MOUNT_OPT_NOASYNCREADDIR  (1<<7) /* no dcache readdir */
#define CEPH_MOUNT_OPT_INO32           (1<<8) /* 32 bit inos */
#define CEPH_MOUNT_OPT_DCACHE          (1<<9) /* use dcache for readdir etc */
#define CEPH_MOUNT_OPT_FSCACHE         (1<<10) /* use fscache */
#define CEPH_MOUNT_OPT_NOPOOLPERM      (1<<11) /* no pool permission check */
#define CEPH_MOUNT_OPT_MOUNTWAIT       (1<<12) /* mount waits if no mds is up */
#define CEPH_MOUNT_OPT_NOQUOTADF       (1<<13) /* no root dir quota in statfs */
#define CEPH_MOUNT_OPT_NOCOPYFROM      (1<<14) /* don't use RADOS 'copy-from' op */
#define CEPH_MOUNT_OPT_ASYNC_DIROPS    (1<<15) /* allow async directory ops */
#define CEPH_MOUNT_OPT_NOPAGECACHE     (1<<16) /* bypass pagecache altogether */

#define CEPH_MOUNT_OPT_DEFAULT			\
	(CEPH_MOUNT_OPT_DCACHE |		\
	 CEPH_MOUNT_OPT_NOCOPYFROM |		\
	 CEPH_MOUNT_OPT_ASYNC_DIROPS)

#define ceph_set_mount_opt(fsc, opt) \
	(fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt
#define ceph_clear_mount_opt(fsc, opt) \
	(fsc)->mount_options->flags &= ~CEPH_MOUNT_OPT_##opt
#define ceph_test_mount_opt(fsc, opt) \
	(!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt))

/* max size of osd read request, limited by libceph */
#define CEPH_MAX_READ_SIZE              CEPH_MSG_MAX_DATA_LEN
/* osd has a configurable limitaion of max write size.
 * CEPH_MSG_MAX_DATA_LEN should be small enough. */
#define CEPH_MAX_WRITE_SIZE		CEPH_MSG_MAX_DATA_LEN
#define CEPH_RASIZE_DEFAULT             (8192*1024)    /* max readahead */
#define CEPH_MAX_READDIR_DEFAULT        1024
#define CEPH_MAX_READDIR_BYTES_DEFAULT  (512*1024)
#define CEPH_SNAPDIRNAME_DEFAULT        ".snap"

/*
 * Delay telling the MDS we no longer want caps, in case we reopen
 * the file.  Delay a minimum amount of time, even if we send a cap
 * message for some other reason.  Otherwise, take the oppotunity to
 * update the mds to avoid sending another message later.
 */
#define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT      5  /* cap release delay */
#define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT     60  /* cap release delay */

struct ceph_mount_options {
	unsigned int flags;

	unsigned int wsize;            /* max write size */
	unsigned int rsize;            /* max read size */
	unsigned int rasize;           /* max readahead */
	unsigned int congestion_kb;    /* max writeback in flight */
	unsigned int caps_wanted_delay_min, caps_wanted_delay_max;
	int caps_max;
	unsigned int max_readdir;       /* max readdir result (entries) */
	unsigned int max_readdir_bytes; /* max readdir result (bytes) */

	bool new_dev_syntax;

	/*
	 * everything above this point can be memcmp'd; everything below
	 * is handled in compare_mount_options()
	 */

	char *snapdir_name;   /* default ".snap" */
	char *mds_namespace;  /* default NULL */
	char *server_path;    /* default NULL (means "/") */
	char *fscache_uniq;   /* default NULL */
	char