1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef _BCACHEFS_FS_H
  3#define _BCACHEFS_FS_H
  4
  5#include "inode.h"
  6#include "opts.h"
  7#include "str_hash.h"
  8#include "quota_types.h"
  9#include "two_state_shared_lock.h"
 10
 11#include <linux/seqlock.h>
 12#include <linux/stat.h>
 13
 14struct bch_inode_info {
 15	struct inode		v;
 16	struct rhash_head	hash;
 17	subvol_inum		ei_inum;
 18
 19	struct list_head	ei_vfs_inode_list;
 20	unsigned long		ei_flags;
 21
 22	struct mutex		ei_update_lock;
 23	u64			ei_quota_reserved;
 24	unsigned long		ei_last_dirtied;
 25	two_state_lock_t	ei_pagecache_lock;
 26
 27	struct mutex		ei_quota_lock;
 28	struct bch_qid		ei_qid;
 29
 30	/*
 31	 * When we've been doing nocow writes we'll need to issue flushes to the
 32	 * underlying block devices
 33	 *
 34	 * XXX: a device may have had a flush issued by some other codepath. It
 35	 * would be better to keep for each device a sequence number that's
 36	 * incremented when we isusue a cache flush, and track here the sequence
 37	 * number that needs flushing.
 38	 */
 39	struct bch_devs_mask	ei_devs_need_flush;
 40
 41	/* copy of inode in btree: */
 42	struct bch_inode_unpacked ei_inode;
 43};
 44
 45#define bch2_pagecache_add_put(i)	bch2_two_state_unlock(&i->ei_pagecache_lock, 0)
 46#define bch2_pagecache_add_tryget(i)	bch2_two_state_trylock(&i->ei_pagecache_lock, 0)
 47#define bch2_pagecache_add_get(i)	bch2_two_state_lock(&i->ei_pagecache_lock, 0)
 48
 49#define bch2_pagecache_block_put(i)	bch2_two_state_unlock(&i->ei_pagecache_lock, 1)
 50#define bch2_pagecache_block_get(i)	bch2_two_state_lock(&i->ei_pagecache_lock, 1)
 51
 52static inline subvol_inum inode_inum(struct bch_inode_info *inode)
 53{
 54	return inode->ei_inum;
 55}
 56
 57/*
 58 * Set if we've gotten a btree error for this inode, and thus the vfs inode and
 59 * btree inode may be inconsistent:
 60 */
 61#define EI_INODE_ERROR			0
 62
 63/*
 64 * Set in the inode is in a snapshot subvolume - we don't do quota accounting in
 65 * those:
 66 */
 67#define EI_INODE_SNAPSHOT		1
 68#define EI_INODE_HASHED			2
 69
 70#define to_bch_ei(_inode)					\
 71	container_of_or_null(_inode, struct bch_inode_info, v)
 72
 73static inline int ptrcmp(void *l, void *r)
 74{
 75	return cmp_int(l, r);
 76}
 77
 78enum bch_inode_lock_op {
 79	INODE_PAGECACHE_BLOCK	= (1U << 0),
 80	INODE_UPDATE_LOCK	= (1U << 1),
 81};
 82
 83#define bch2_lock_inodes(_locks, ...)					\
 84do {									\
 85	struct bch_inode_info *a[] = { NULL, __VA_ARGS__ };		\
 86	unsigned i;							\
 87									\
 88	bubble_sort(&a[1], ARRAY_SIZE(a) - 1, ptrcmp);			\
 89									\
 90	for (i = 1; i < ARRAY_SIZE(a); i++)				\
 91		if (a[i] != a[i - 1]) {					\
 92			if ((_locks) & INODE_PAGECACHE_BLOCK)		\
 93				bch2_pagecache_block_get(a[i]);\
 94			if ((_locks) & INODE_UPDATE_LOCK)			\
 95				mutex_lock_nested(&a[i]->ei_update_lock, i);\
 96		}							\
 97} while (0)
 98
 99#define bch2_unlock_inodes(_locks, ...)					\
100do {									\
101	struct bch_inode_info *a[] = { NULL, __VA_ARGS__ };		\
102	unsigned i;							\
103									\
104	bubble_sort(&a[1], ARRAY_SIZE(a) - 1, ptrcmp);			\
105									\
106	for (i = 1; i < ARRAY_SIZE(a); i++)				\
107		if (a[i] != a[i - 1]) {					\
108			if ((_locks) & INODE_PAGECACHE_BLOCK)		\
109				bch2_pagecache_block_put(a[i]);\
110			if ((_locks) & INODE_UPDATE_LOCK)			\
111				mutex_unlock(&a[i]->ei_update_lock);	\
112		}							\
113} while (0)
114
115static inline struct bch_inode_info *file_bch_inode(struct file *file)
116{
117	return to_bch_ei(file_inode(file));
118}
119
120static inline bool inode_attr_changing(struct bch_inode_info *dir,
121				struct bch_inode_info *inode,
122				enum inode_opt_id id)
123{
124	return !(inode->ei_inode.bi_fields_set & (1 << id)) &&
125		bch2_inode_opt_get(&dir->ei_inode, id) !=
126		bch2_inode_opt_get(&inode->ei_inode, id);
127}
128
129static inline bool inode_attrs_changing(struct bch_inode_info *dir,
130				 struct bch_inode_info *inode)
131{
132	unsigned id;
133
134	for (id = 0; id < Inode_opt_nr; id++)
135		if (inode_attr_changing(dir, inode, id))
136			return true;
137
138	return false;
139}
140
141struct bch_inode_unpacked;
142
143#ifndef NO_BCACHEFS_FS
144
145struct bch_inode_info *
146__bch2_create(struct mnt_idmap *, struct bch_inode_info *,
147	      struct dentry *, umode_t, dev_t, subvol_inum, unsigned);
148
149int bch2_inode_or_descendents_is_open(struct btree_trans *trans, struct bpos p);
150
151int bch2_fs_quota_transfer(struct bch_fs *,
152			   struct bch_inode_info *,
153			   struct bch_qid,
154			   unsigned,
155			   enum quota_acct_mode);
156
157static inline int bch2_set_projid(struct bch_fs *c,
158				  struct bch_inode_info *inode,
159				  u32 projid)
160{
161	struct bch_qid qid = inode->ei_qid;
162
163	qid.q[QTYP_PRJ] = projid;
164
165	return bch2_fs_quota_transfer(c, inode, qid,
166				      1 << QTYP_PRJ,
167				      KEY_TYPE_QUOTA_PREALLOC);
168}
169
170struct inode *bch2_vfs_inode_get(struct bch_fs *, subvol_inum);
171
172/* returns 0 if we want to do the update, or error is passed up */
173typedef int (*inode_set_fn)(struct btree_trans *,
174			    struct bch_inode_info *,
175			    struct bch_inode_unpacked *, void *);
176
177void bch2_inode_update_after_write(struct btree_trans *,
178				   struct bch_inode_info *,
179				   struct bch_inode_unpacked *,
180				   unsigned);
181int __must_check bch2_write_inode(struct bch_fs *, struct bch_inode_info *,
182				  inode_set_fn, void *, unsigned);
183
184int bch2_setattr_nonsize(struct mnt_idmap *,
185			 struct bch_inode_info *,
186			 struct iattr *);
187int __bch2_unlink(struct inode *, struct dentry *, bool);
188
189void bch2_evict_subvolume_inodes(struct bch_fs *, snapshot_id_list *);
190
191void bch2_fs_vfs_exit(struct bch_fs *);
192int bch2_fs_vfs_init(struct bch_fs *);
193
194void bch2_vfs_exit(void);
195int bch2_vfs_init(void);
196
197#else
198
199#define bch2_inode_update_after_write(_trans, _inode, _inode_u, _fields)	({ do {} while (0); })
200
201static inline int bch2_inode_or_descendents_is_open(struct btree_trans *trans, struct bpos p) { return 0; }
202
203static inline void bch2_evict_subvolume_inodes(struct bch_fs *c,
204					       snapshot_id_list *s) {}
205
206static inline void bch2_fs_vfs_exit(struct bch_fs *c) {}
207static inline int bch2_fs_vfs_init(struct bch_fs *c) { return 0; }
208
209static inline void bch2_vfs_exit(void) {}
210static inline int bch2_vfs_init(void) { return 0; }
211
212#endif /* NO_BCACHEFS_FS */
213
214#endif /* _BCACHEFS_FS_H */