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linux/fs/ceph/super.h
Zhi Zhang e30ee58121 ceph: try to allocate enough memory for reserved caps 
ceph_reserve_caps() may not reserve enough caps under high memory
pressure, but it saved the needed caps number that expected to
be reserved. When getting caps, crash would happen due to number
mismatch.

Now we will try to trim more caps when failing to allocate memory
for caps need to be reserved, then try again. If still failing to
allocate memory, return -ENOMEM.

Signed-off-by: Zhi Zhang <zhang.david2011@gmail.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-01-29 18:36:12 +01:00

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/* 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/ceph/libceph.h>
#ifdef CONFIG_CEPH_FSCACHE
#include <linux/fscache.h>
#endif
/* f_type in struct statfs */
#define CEPH_SUPER_MAGIC 0x00c36400
/* 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_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_DEFAULT CEPH_MOUNT_OPT_DCACHE
#define ceph_set_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 {
int flags;
int sb_flags;
int wsize; /* max write size */
int rsize; /* max read size */
int rasize; /* max readahead */
int congestion_kb; /* max writeback in flight */
int caps_wanted_delay_min, caps_wanted_delay_max;
int max_readdir; /* max readdir result (entires) */
int max_readdir_bytes; /* max readdir result (bytes) */
/*
* 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 "/" */
char *fscache_uniq; /* default NULL */
};
struct ceph_fs_client {
struct super_block *sb;
struct ceph_mount_options *mount_options;
struct ceph_client *client;
unsigned long mount_state;
int min_caps; /* min caps i added */
struct ceph_mds_client *mdsc;
/* writeback */
mempool_t *wb_pagevec_pool;
struct workqueue_struct *wb_wq;
struct workqueue_struct *pg_inv_wq;
struct workqueue_struct *trunc_wq;
atomic_long_t writeback_count;
#ifdef CONFIG_DEBUG_FS
struct dentry *debugfs_dentry_lru, *debugfs_caps;
struct dentry *debugfs_congestion_kb;
struct dentry *debugfs_bdi;
struct dentry *debugfs_mdsc, *debugfs_mdsmap;
struct dentry *debugfs_mds_sessions;
#endif
#ifdef CONFIG_CEPH_FSCACHE
struct fscache_cookie *fscache;
#endif
};
/*
* File i/o capability. This tracks shared state with the metadata
* server that allows us to cache or writeback attributes or to read
* and write data. For any given inode, we should have one or more
* capabilities, one issued by each metadata server, and our
* cumulative access is the OR of all issued capabilities.
*
* Each cap is referenced by the inode's i_caps rbtree and by per-mds
* session capability lists.
*/
struct ceph_cap {
struct ceph_inode_info *ci;
struct rb_node ci_node; /* per-ci cap tree */
struct ceph_mds_session *session;
struct list_head session_caps; /* per-session caplist */
u64 cap_id; /* unique cap id (mds provided) */
union {
/* in-use caps */
struct {
int issued; /* latest, from the mds */
int implemented; /* implemented superset of
issued (for revocation) */
int mds, mds_wanted;
};
/* caps to release */
struct {
u64 cap_ino;
int queue_release;
};
};
u32 seq, issue_seq, mseq;
u32 cap_gen; /* active/stale cycle */
unsigned long last_used;
struct list_head caps_item;
};
#define CHECK_CAPS_NODELAY 1 /* do not delay any further */
#define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */
#define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */
struct ceph_cap_flush {
u64 tid;
int caps; /* 0 means capsnap */
bool wake; /* wake up flush waiters when finish ? */
struct list_head g_list; // global
struct list_head i_list; // per inode
};
/*
* Snapped cap state that is pending flush to mds. When a snapshot occurs,
* we first complete any in-process sync writes and writeback any dirty
* data before flushing the snapped state (tracked here) back to the MDS.
*/
struct ceph_cap_snap {
refcount_t nref;
struct list_head ci_item;
struct ceph_cap_flush cap_flush;
u64 follows;
int issued, dirty;
struct ceph_snap_context *context;
umode_t mode;
kuid_t uid;
kgid_t gid;
struct ceph_buffer *xattr_blob;
u64 xattr_version;
u64 size;
struct timespec mtime, atime, ctime;
u64 time_warp_seq;
u64 truncate_size;
u32 truncate_seq;
int writing; /* a sync write is still in progress */
int dirty_pages; /* dirty pages awaiting writeback */
bool inline_data;
bool need_flush;
};
static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
{
if (refcount_dec_and_test(&capsnap->nref)) {
if (capsnap->xattr_blob)
ceph_buffer_put(capsnap->xattr_blob);
kfree(capsnap);
}
}
/*
* The frag tree describes how a directory is fragmented, potentially across
* multiple metadata servers. It is also used to indicate points where
* metadata authority is delegated, and whether/where metadata is replicated.
*
* A _leaf_ frag will be present in the i_fragtree IFF there is
* delegation info. That is, if mds >= 0 || ndist > 0.
*/
#define CEPH_MAX_DIRFRAG_REP 4
struct ceph_inode_frag {
struct rb_node node;
/* fragtree state */
u32 frag;
int split_by; /* i.e. 2^(split_by) children */
/* delegation and replication info */
int mds; /* -1 if same authority as parent */
int ndist; /* >0 if replicated */
int dist[CEPH_MAX_DIRFRAG_REP];
};
/*
* We cache inode xattrs as an encoded blob until they are first used,
* at which point we parse them into an rbtree.
*/
struct ceph_inode_xattr {
struct rb_node node;
const char *name;
int name_len;
const char *val;
int val_len;
int dirty;
int should_free_name;
int should_free_val;
};
/*
* Ceph dentry state
*/
struct ceph_dentry_info {
struct ceph_mds_session *lease_session;
int lease_shared_gen;
u32 lease_gen;
u32 lease_seq;
unsigned long lease_renew_after, lease_renew_from;
struct list_head lru;
struct dentry *dentry;
unsigned long time;
u64 offset;
};
struct ceph_inode_xattrs_info {
/*
* (still encoded) xattr blob. we avoid the overhead of parsing
* this until someone actually calls getxattr, etc.
*
* blob->vec.iov_len == 4 implies there are no xattrs; blob ==
* NULL means we don't know.
*/
struct ceph_buffer *blob, *prealloc_blob;
struct rb_root index;
bool dirty;
int count;
int names_size;
int vals_size;
u64 version, index_version;
};
/*
* Ceph inode.
*/
struct ceph_inode_info {
struct ceph_vino i_vino; /* ceph ino + snap */
spinlock_t i_ceph_lock;
u64 i_version;
u64 i_inline_version;
u32 i_time_warp_seq;
unsigned i_ceph_flags;
atomic64_t i_release_count;
atomic64_t i_ordered_count;
atomic64_t i_complete_seq[2];
struct ceph_dir_layout i_dir_layout;
struct ceph_file_layout i_layout;
char *i_symlink;
/* for dirs */
struct timespec i_rctime;
u64 i_rbytes, i_rfiles, i_rsubdirs;
u64 i_files, i_subdirs;
struct rb_root i_fragtree;
int i_fragtree_nsplits;
struct mutex i_fragtree_mutex;
struct ceph_inode_xattrs_info i_xattrs;
/* capabilities. protected _both_ by i_ceph_lock and cap->session's
* s_mutex. */
struct rb_root i_caps; /* cap list */
struct ceph_cap *i_auth_cap; /* authoritative cap, if any */
unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */
struct list_head i_dirty_item, i_flushing_item;
/* we need to track cap writeback on a per-cap-bit basis, to allow
* overlapping, pipelined cap flushes to the mds. we can probably
* reduce the tid to 8 bits if we're concerned about inode size. */
struct ceph_cap_flush *i_prealloc_cap_flush;
struct list_head i_cap_flush_list;
wait_queue_head_t i_cap_wq; /* threads waiting on a capability */
unsigned long i_hold_caps_min; /* jiffies */
unsigned long i_hold_caps_max; /* jiffies */
struct list_head i_cap_delay_list; /* for delayed cap release to mds */
struct ceph_cap_reservation i_cap_migration_resv;
struct list_head i_cap_snaps; /* snapped state pending flush to mds */
struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 or
dirty|flushing caps */
unsigned i_snap_caps; /* cap bits for snapped files */
int i_nr_by_mode[CEPH_FILE_MODE_BITS]; /* open file counts */
struct mutex i_truncate_mutex;
u32 i_truncate_seq; /* last truncate to smaller size */
u64 i_truncate_size; /* and the size we last truncated down to */
int i_truncate_pending; /* still need to call vmtruncate */
u64 i_max_size; /* max file size authorized by mds */
u64 i_reported_size; /* (max_)size reported to or requested of mds */
u64 i_wanted_max_size; /* offset we'd like to write too */
u64 i_requested_max_size; /* max_size we've requested */
/* held references to caps */
int i_pin_ref;
int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref;
int i_wrbuffer_ref, i_wrbuffer_ref_head;
atomic_t i_filelock_ref;
atomic_t i_shared_gen; /* increment each time we get FILE_SHARED */
u32 i_rdcache_gen; /* incremented each time we get FILE_CACHE. */
u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */
struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */
struct list_head i_unsafe_iops; /* uncommitted mds inode ops */
spinlock_t i_unsafe_lock;
struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */
int i_snap_realm_counter; /* snap realm (if caps) */
struct list_head i_snap_realm_item;
struct list_head i_snap_flush_item;
struct work_struct i_wb_work; /* writeback work */
struct work_struct i_pg_inv_work; /* page invalidation work */
struct work_struct i_vmtruncate_work;
#ifdef CONFIG_CEPH_FSCACHE
struct fscache_cookie *fscache;
u32 i_fscache_gen;
#endif
struct inode vfs_inode; /* at end */
};
static inline struct ceph_inode_info *ceph_inode(struct inode *inode)
{
return container_of(inode, struct ceph_inode_info, vfs_inode);
}
static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode)
{
return (struct ceph_fs_client *)inode->i_sb->s_fs_info;
}
static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb)
{
return (struct ceph_fs_client *)sb->s_fs_info;
}
static inline struct ceph_vino ceph_vino(struct inode *inode)
{
return ceph_inode(inode)->i_vino;
}
/*
* ino_t is <64 bits on many architectures, blech.
*
* i_ino (kernel inode) st_ino (userspace)
* i386 32 32
* x86_64+ino32 64 32
* x86_64 64 64
*/
static inline u32 ceph_ino_to_ino32(__u64 vino)
{
u32 ino = vino & 0xffffffff;
ino ^= vino >> 32;
if (!ino)
ino = 2;
return ino;
}
/*
* kernel i_ino value
*/
static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
{
#if BITS_PER_LONG == 32
return ceph_ino_to_ino32(vino.ino);
#else
return (ino_t)vino.ino;
#endif
}
/*
* user-visible ino (stat, filldir)
*/
#if BITS_PER_LONG == 32
static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
{
return ino;
}
#else
static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
{
if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32))
ino = ceph_ino_to_ino32(ino);
return ino;
}
#endif
/* for printf-style formatting */
#define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap
static inline u64 ceph_ino(struct inode *inode)
{
return ceph_inode(inode)->i_vino.ino;
}
static inline u64 ceph_snap(struct inode *inode)
{
return ceph_inode(inode)->i_vino.snap;
}
static inline int ceph_ino_compare(struct inode *inode, void *data)
{
struct ceph_vino *pvino = (struct ceph_vino *)data;
struct ceph_inode_info *ci = ceph_inode(inode);
return ci->i_vino.ino == pvino->ino &&
ci->i_vino.snap == pvino->snap;
}
static inline struct inode *ceph_find_inode(struct super_block *sb,
struct ceph_vino vino)
{
ino_t t = ceph_vino_to_ino(vino);
return ilookup5(sb, t, ceph_ino_compare, &vino);
}
/*
* Ceph inode.
*/
#define CEPH_I_DIR_ORDERED (1 << 0) /* dentries in dir are ordered */
#define CEPH_I_NODELAY (1 << 1) /* do not delay cap release */
#define CEPH_I_FLUSH (1 << 2) /* do not delay flush of dirty metadata */
#define CEPH_I_NOFLUSH (1 << 3) /* do not flush dirty caps */
#define CEPH_I_POOL_PERM (1 << 4) /* pool rd/wr bits are valid */
#define CEPH_I_POOL_RD (1 << 5) /* can read from pool */
#define CEPH_I_POOL_WR (1 << 6) /* can write to pool */
#define CEPH_I_SEC_INITED (1 << 7) /* security initialized */
#define CEPH_I_CAP_DROPPED (1 << 8) /* caps were forcibly dropped */
#define CEPH_I_KICK_FLUSH (1 << 9) /* kick flushing caps */
#define CEPH_I_FLUSH_SNAPS (1 << 10) /* need flush snapss */
#define CEPH_I_ERROR_WRITE (1 << 11) /* have seen write errors */
#define CEPH_I_ERROR_FILELOCK (1 << 12) /* have seen file lock errors */
/*
* We set the ERROR_WRITE bit when we start seeing write errors on an inode
* and then clear it when they start succeeding. Note that we do a lockless
* check first, and only take the lock if it looks like it needs to be changed.
* The write submission code just takes this as a hint, so we're not too
* worried if a few slip through in either direction.
*/
static inline void ceph_set_error_write(struct ceph_inode_info *ci)
{
if (!(READ_ONCE(ci->i_ceph_flags) & CEPH_I_ERROR_WRITE)) {
spin_lock(&ci->i_ceph_lock);
ci->i_ceph_flags |= CEPH_I_ERROR_WRITE;
spin_unlock(&ci->i_ceph_lock);
}
}
static inline void ceph_clear_error_write(struct ceph_inode_info *ci)
{
if (READ_ONCE(ci->i_ceph_flags) & CEPH_I_ERROR_WRITE) {
spin_lock(&ci->i_ceph_lock);
ci->i_ceph_flags &= ~CEPH_I_ERROR_WRITE;
spin_unlock(&ci->i_ceph_lock);
}
}
static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci,
long long release_count,
long long ordered_count)
{
smp_mb__before_atomic();
atomic64_set(&ci->i_complete_seq[0], release_count);
atomic64_set(&ci->i_complete_seq[1], ordered_count);
}
static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci)
{
atomic64_inc(&ci->i_release_count);
}
static inline void __ceph_dir_clear_ordered(struct ceph_inode_info *ci)
{
atomic64_inc(&ci->i_ordered_count);
}
static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci)
{
return atomic64_read(&ci->i_complete_seq[0]) ==
atomic64_read(&ci->i_release_count);
}
static inline bool __ceph_dir_is_complete_ordered(struct ceph_inode_info *ci)
{
return atomic64_read(&ci->i_complete_seq[0]) ==
atomic64_read(&ci->i_release_count) &&
atomic64_read(&ci->i_complete_seq[1]) ==
atomic64_read(&ci->i_ordered_count);
}
static inline void ceph_dir_clear_complete(struct inode *inode)
{
__ceph_dir_clear_complete(ceph_inode(inode));
}
static inline void ceph_dir_clear_ordered(struct inode *inode)
{
__ceph_dir_clear_ordered(ceph_inode(inode));
}
static inline bool ceph_dir_is_complete_ordered(struct inode *inode)
{
bool ret = __ceph_dir_is_complete_ordered(ceph_inode(inode));
smp_rmb();
return ret;
}
/* find a specific frag @f */
extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci,
u32 f);
/*
* choose fragment for value @v. copy frag content to pfrag, if leaf
* exists
*/
extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
struct ceph_inode_frag *pfrag,
int *found);
static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry)
{
return (struct ceph_dentry_info *)dentry->d_fsdata;
}
/*
* caps helpers
*/
static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci)
{
return !RB_EMPTY_ROOT(&ci->i_caps);
}
extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented);
extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t);
extern int __ceph_caps_issued_other(struct ceph_inode_info *ci,
struct ceph_cap *cap);
static inline int ceph_caps_issued(struct ceph_inode_info *ci)
{
int issued;
spin_lock(&ci->i_ceph_lock);
issued = __ceph_caps_issued(ci, NULL);
spin_unlock(&ci->i_ceph_lock);
return issued;
}
static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask,
int touch)
{
int r;
spin_lock(&ci->i_ceph_lock);
r = __ceph_caps_issued_mask(ci, mask, touch);
spin_unlock(&ci->i_ceph_lock);
return r;
}
static inline int __ceph_caps_dirty(struct ceph_inode_info *ci)
{
return ci->i_dirty_caps | ci->i_flushing_caps;
}
extern struct ceph_cap_flush *ceph_alloc_cap_flush(void);
extern void ceph_free_cap_flush(struct ceph_cap_flush *cf);
extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask,
struct ceph_cap_flush **pcf);
extern int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
struct ceph_cap *ocap, int mask);
extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask);
extern int __ceph_caps_used(struct ceph_inode_info *ci);
extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci);
/*
* wanted, by virtue of open file modes AND cap refs (buffered/cached data)
*/
static inline int __ceph_caps_wanted(struct ceph_inode_info *ci)
{
int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
if (w & CEPH_CAP_FILE_BUFFER)
w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */
return w;
}
/* what the mds thinks we want */
extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check);
extern void ceph_caps_init(struct ceph_mds_client *mdsc);
extern void ceph_caps_finalize(struct ceph_mds_client *mdsc);
extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta);
extern int ceph_reserve_caps(struct ceph_mds_client *mdsc,
struct ceph_cap_reservation *ctx, int need);
extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
struct ceph_cap_reservation *ctx);
extern void ceph_reservation_status(struct ceph_fs_client *client,
int *total, int *avail, int *used,
int *reserved, int *min);
/*
* we keep buffered readdir results attached to file->private_data
*/
#define CEPH_F_SYNC 1
#define CEPH_F_ATEND 2
struct ceph_file_info {
short fmode; /* initialized on open */
short flags; /* CEPH_F_* */
spinlock_t rw_contexts_lock;
struct list_head rw_contexts;
/* readdir: position within the dir */
u32 frag;
struct ceph_mds_request *last_readdir;
/* readdir: position within a frag */
unsigned next_offset; /* offset of next chunk (last_name's + 1) */
char *last_name; /* last entry in previous chunk */
long long dir_release_count;
long long dir_ordered_count;
int readdir_cache_idx;
/* used for -o dirstat read() on directory thing */
char *dir_info;
int dir_info_len;
};
struct ceph_rw_context {
struct list_head list;
struct task_struct *thread;
int caps;
};
#define CEPH_DEFINE_RW_CONTEXT(_name, _caps) \
struct ceph_rw_context _name = { \
.thread = current, \
.caps = _caps, \
}
static inline void ceph_add_rw_context(struct ceph_file_info *cf,
struct ceph_rw_context *ctx)
{
spin_lock(&cf->rw_contexts_lock);
list_add(&ctx->list, &cf->rw_contexts);
spin_unlock(&cf->rw_contexts_lock);
}
static inline void ceph_del_rw_context(struct ceph_file_info *cf,
struct ceph_rw_context *ctx)
{
spin_lock(&cf->rw_contexts_lock);
list_del(&ctx->list);
spin_unlock(&cf->rw_contexts_lock);
}
static inline struct ceph_rw_context*
ceph_find_rw_context(struct ceph_file_info *cf)
{
struct ceph_rw_context *ctx, *found = NULL;
spin_lock(&cf->rw_contexts_lock);
list_for_each_entry(ctx, &cf->rw_contexts, list) {
if (ctx->thread == current) {
found = ctx;
break;
}
}
spin_unlock(&cf->rw_contexts_lock);
return found;
}
struct ceph_readdir_cache_control {
struct page *page;
struct dentry **dentries;
int index;
};
/*
* A "snap realm" describes a subset of the file hierarchy sharing
* the same set of snapshots that apply to it. The realms themselves
* are organized into a hierarchy, such that children inherit (some of)
* the snapshots of their parents.
*
* All inodes within the realm that have capabilities are linked into a
* per-realm list.
*/
struct ceph_snap_realm {
u64 ino;
atomic_t nref;
struct rb_node node;
u64 created, seq;
u64 parent_ino;
u64 parent_since; /* snapid when our current parent became so */
u64 *prior_parent_snaps; /* snaps inherited from any parents we */
u32 num_prior_parent_snaps; /* had prior to parent_since */
u64 *snaps; /* snaps specific to this realm */
u32 num_snaps;
struct ceph_snap_realm *parent;
struct list_head children; /* list of child realms */
struct list_head child_item;
struct list_head empty_item; /* if i have ref==0 */
struct list_head dirty_item; /* if realm needs new context */
/* the current set of snaps for this realm */
struct ceph_snap_context *cached_context;
struct list_head inodes_with_caps;
spinlock_t inodes_with_caps_lock;
};
static inline int default_congestion_kb(void)
{
int congestion_kb;
/*
* Copied from NFS
*
* congestion size, scale with available memory.
*
* 64MB: 8192k
* 128MB: 11585k
* 256MB: 16384k
* 512MB: 23170k
* 1GB: 32768k
* 2GB: 46340k
* 4GB: 65536k
* 8GB: 92681k
* 16GB: 131072k
*
* This allows larger machines to have larger/more transfers.
* Limit the default to 256M
*/
congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
if (congestion_kb > 256*1024)
congestion_kb = 256*1024;
return congestion_kb;
}
/* snap.c */
struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,
u64 ino);
extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc,
struct ceph_snap_realm *realm);
extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc,
struct ceph_snap_realm *realm);
extern int ceph_update_snap_trace(struct ceph_mds_client *m,
void *p, void *e, bool deletion,
struct ceph_snap_realm **realm_ret);
extern void ceph_handle_snap(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session,
struct ceph_msg *msg);
extern void ceph_queue_cap_snap(struct ceph_inode_info *ci);
extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
struct ceph_cap_snap *capsnap);
extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc);
/*
* a cap_snap is "pending" if it is still awaiting an in-progress
* sync write (that may/may not still update size, mtime, etc.).
*/
static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci)
{
return !list_empty(&ci->i_cap_snaps) &&
list_last_entry(&ci->i_cap_snaps, struct ceph_cap_snap,
ci_item)->writing;
}
/* inode.c */
extern const struct inode_operations ceph_file_iops;
extern struct inode *ceph_alloc_inode(struct super_block *sb);
extern void ceph_destroy_inode(struct inode *inode);
extern int ceph_drop_inode(struct inode *inode);
extern struct inode *ceph_get_inode(struct super_block *sb,
struct ceph_vino vino);
extern struct inode *ceph_get_snapdir(struct inode *parent);
extern int ceph_fill_file_size(struct inode *inode, int issued,
u32 truncate_seq, u64 truncate_size, u64 size);
extern void ceph_fill_file_time(struct inode *inode, int issued,
u64 time_warp_seq, struct timespec *ctime,
struct timespec *mtime, struct timespec *atime);
extern int ceph_fill_trace(struct super_block *sb,
struct ceph_mds_request *req);
extern int ceph_readdir_prepopulate(struct ceph_mds_request *req,
struct ceph_mds_session *session);
extern int ceph_inode_holds_cap(struct inode *inode, int mask);
extern bool ceph_inode_set_size(struct inode *inode, loff_t size);
extern void __ceph_do_pending_vmtruncate(struct inode *inode);
extern void ceph_queue_vmtruncate(struct inode *inode);
extern void ceph_queue_invalidate(struct inode *inode);
extern void ceph_queue_writeback(struct inode *inode);
extern int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
int mask, bool force);
static inline int ceph_do_getattr(struct inode *inode, int mask, bool force)
{
return __ceph_do_getattr(inode, NULL, mask, force);
}
extern int ceph_permission(struct inode *inode, int mask);
extern int __ceph_setattr(struct inode *inode, struct iattr *attr);
extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
extern int ceph_getattr(const struct path *path, struct kstat *stat,
u32 request_mask, unsigned int flags);
/* xattr.c */
int __ceph_setxattr(struct inode *, const char *, const void *, size_t, int);
ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t);
extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci);
extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
extern void __init ceph_xattr_init(void);
extern void ceph_xattr_exit(void);
extern const struct xattr_handler *ceph_xattr_handlers[];
#ifdef CONFIG_SECURITY
extern bool ceph_security_xattr_deadlock(struct inode *in);
extern bool ceph_security_xattr_wanted(struct inode *in);
#else
static inline bool ceph_security_xattr_deadlock(struct inode *in)
{
return false;
}
static inline bool ceph_security_xattr_wanted(struct inode *in)
{
return false;
}
#endif
/* acl.c */
struct ceph_acls_info {
void *default_acl;
void *acl;
struct ceph_pagelist *pagelist;
};
#ifdef CONFIG_CEPH_FS_POSIX_ACL
struct posix_acl *ceph_get_acl(struct inode *, int);
int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type);
int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
struct ceph_acls_info *info);
void ceph_init_inode_acls(struct inode *inode, struct ceph_acls_info *info);
void ceph_release_acls_info(struct ceph_acls_info *info);
static inline void ceph_forget_all_cached_acls(struct inode *inode)
{
forget_all_cached_acls(inode);
}
#else
#define ceph_get_acl NULL
#define ceph_set_acl NULL
static inline int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
struct ceph_acls_info *info)
{
return 0;
}
static inline void ceph_init_inode_acls(struct inode *inode,
struct ceph_acls_info *info)
{
}
static inline void ceph_release_acls_info(struct ceph_acls_info *info)
{
}
static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode)
{
return 0;
}
static inline void ceph_forget_all_cached_acls(struct inode *inode)
{
}
#endif
/* caps.c */
extern const char *ceph_cap_string(int c);
extern void ceph_handle_caps(struct ceph_mds_session *session,
struct ceph_msg *msg);
extern struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc,
struct ceph_cap_reservation *ctx);
extern void ceph_add_cap(struct inode *inode,
struct ceph_mds_session *session, u64 cap_id,
int fmode, unsigned issued, unsigned wanted,
unsigned cap, unsigned seq, u64 realmino, int flags,
struct ceph_cap **new_cap);
extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release);
extern void ceph_put_cap(struct ceph_mds_client *mdsc,
struct ceph_cap *cap);
extern int ceph_is_any_caps(struct inode *inode);
extern void ceph_queue_caps_release(struct inode *inode);
extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc);
extern int ceph_fsync(struct file *file, loff_t start, loff_t end,
int datasync);
extern void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session);
extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session);
extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci,
int mds);
extern int ceph_get_cap_mds(struct inode *inode);
extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps);
extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had);
extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
struct ceph_snap_context *snapc);
extern void ceph_flush_snaps(struct ceph_inode_info *ci,
struct ceph_mds_session **psession);
extern bool __ceph_should_report_size(struct ceph_inode_info *ci);
extern void ceph_check_caps(struct ceph_inode_info *ci, int flags,
struct ceph_mds_session *session);
extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc);
extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc);
extern int ceph_encode_inode_release(void **p, struct inode *inode,
int mds, int drop, int unless, int force);
extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
struct inode *dir,
int mds, int drop, int unless);
extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
loff_t endoff, int *got, struct page **pinned_page);
extern int ceph_try_get_caps(struct ceph_inode_info *ci,
int need, int want, int *got);
/* for counting open files by mode */
extern void __ceph_get_fmode(struct ceph_inode_info *ci, int mode);
extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode);
/* addr.c */
extern const struct address_space_operations ceph_aops;
extern int ceph_mmap(struct file *file, struct vm_area_struct *vma);
extern int ceph_uninline_data(struct file *filp, struct page *locked_page);
extern int ceph_pool_perm_check(struct ceph_inode_info *ci, int need);
extern void ceph_pool_perm_destroy(struct ceph_mds_client* mdsc);
/* file.c */
extern const struct file_operations ceph_file_fops;
extern int ceph_renew_caps(struct inode *inode);
extern int ceph_open(struct inode *inode, struct file *file);
extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
struct file *file, unsigned flags, umode_t mode,
int *opened);
extern int ceph_release(struct inode *inode, struct file *filp);
extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
char *data, size_t len);
/* dir.c */
extern const struct file_operations ceph_dir_fops;
extern const struct file_operations ceph_snapdir_fops;
extern const struct inode_operations ceph_dir_iops;
extern const struct inode_operations ceph_snapdir_iops;
extern const struct dentry_operations ceph_dentry_ops;
extern loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order);
extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry);
extern int ceph_handle_snapdir(struct ceph_mds_request *req,
struct dentry *dentry, int err);
extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
struct dentry *dentry, int err);
extern void ceph_dentry_lru_add(struct dentry *dn);
extern void ceph_dentry_lru_touch(struct dentry *dn);
extern void ceph_dentry_lru_del(struct dentry *dn);
extern void ceph_invalidate_dentry_lease(struct dentry *dentry);
extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn);
extern void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl);
/* ioctl.c */
extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
/* export.c */
extern const struct export_operations ceph_export_ops;
/* locks.c */
extern __init void ceph_flock_init(void);
extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl);
extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl);
extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num);
extern int ceph_encode_locks_to_buffer(struct inode *inode,
struct ceph_filelock *flocks,
int num_fcntl_locks,
int num_flock_locks);
extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks,
struct ceph_pagelist *pagelist,
int num_fcntl_locks, int num_flock_locks);
/* debugfs.c */
extern int ceph_fs_debugfs_init(struct ceph_fs_client *client);
extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client);
#endif /* _FS_CEPH_SUPER_H */
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