LXR linux/fs/ocfs2/quota.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * quota.h for OCFS2
   4 *
   5 * On disk quota structures for local and global quota file, in-memory
   6 * structures.
   7 *
   8 */
   9
  10#ifndef _OCFS2_QUOTA_H
  11#define _OCFS2_QUOTA_H
  12
  13#include <linux/types.h>
  14#include <linux/slab.h>
  15#include <linux/quota.h>
  16#include <linux/list.h>
  17#include <linux/dqblk_qtree.h>
  18
  19#include "ocfs2.h"
  20
  21/* Number of quota types we support */
  22#define OCFS2_MAXQUOTAS 2
  23
  24/*
  25 * In-memory structures
  26 */
  27struct ocfs2_dquot {
  28        struct dquot dq_dquot;  /* Generic VFS dquot */
  29        loff_t dq_local_off;    /* Offset in the local quota file */
  30        u64 dq_local_phys_blk;  /* Physical block carrying quota structure */
  31        struct ocfs2_quota_chunk *dq_chunk;     /* Chunk dquot is in */
  32        unsigned int dq_use_count;      /* Number of nodes having reference to this entry in global quota file */
  33        s64 dq_origspace;       /* Last globally synced space usage */
  34        s64 dq_originodes;      /* Last globally synced inode usage */
  35        struct llist_node list; /* Member of list of dquots to drop */
  36};
  37
  38/* Description of one chunk to recover in memory */
  39struct ocfs2_recovery_chunk {
  40        struct list_head rc_list;       /* List of chunks */
  41        int rc_chunk;                   /* Chunk number */
  42        unsigned long *rc_bitmap;       /* Bitmap of entries to recover */
  43};
  44
  45struct ocfs2_quota_recovery {
  46        struct list_head r_list[OCFS2_MAXQUOTAS];       /* List of chunks to recover */
  47};
  48
  49/* In-memory structure with quota header information */
  50struct ocfs2_mem_dqinfo {
  51        unsigned int dqi_type;          /* Quota type this structure describes */
  52        unsigned int dqi_flags;         /* Flags OLQF_* */
  53        unsigned int dqi_chunks;        /* Number of chunks in local quota file */
  54        unsigned int dqi_blocks;        /* Number of blocks allocated for local quota file */
  55        unsigned int dqi_syncms;        /* How often should we sync with other nodes */
  56        struct list_head dqi_chunk;     /* List of chunks */
  57        struct inode *dqi_gqinode;      /* Global quota file inode */
  58        struct ocfs2_lock_res dqi_gqlock;       /* Lock protecting quota information structure */
  59        struct buffer_head *dqi_gqi_bh; /* Buffer head with global quota file inode - set only if inode lock is obtained */
  60        int dqi_gqi_count;              /* Number of holders of dqi_gqi_bh */
  61        u64 dqi_giblk;                  /* Number of block with global information header */
  62        struct buffer_head *dqi_lqi_bh; /* Buffer head with local quota file inode */
  63        struct buffer_head *dqi_libh;   /* Buffer with local information header */
  64        struct qtree_mem_dqinfo dqi_gi; /* Info about global file */
  65        struct delayed_work dqi_sync_work;      /* Work for syncing dquots */
  66        struct ocfs2_quota_recovery *dqi_rec;   /* Pointer to recovery
  67                                                 * information, in case we
  68                                                 * enable quotas on file
  69                                                 * needing it */
  70};
  71
  72static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot)
  73{
  74        return container_of(dquot, struct ocfs2_dquot, dq_dquot);
  75}
  76
  77struct ocfs2_quota_chunk {
  78        struct list_head qc_chunk;      /* List of quotafile chunks */
  79        int qc_num;                     /* Number of quota chunk */
  80        struct buffer_head *qc_headerbh;        /* Buffer head with chunk header */
  81};
  82
  83extern struct kmem_cache *ocfs2_dquot_cachep;
  84extern struct kmem_cache *ocfs2_qf_chunk_cachep;
  85
  86extern const struct qtree_fmt_operations ocfs2_global_ops;
  87
  88struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
  89                                struct ocfs2_super *osb, int slot_num);
  90int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
  91                                struct ocfs2_quota_recovery *rec,
  92                                int slot_num);
  93void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec);
  94ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
  95                         size_t len, loff_t off);
  96ssize_t ocfs2_quota_write(struct super_block *sb, int type,
  97                          const char *data, size_t len, loff_t off);
  98int ocfs2_global_read_info(struct super_block *sb, int type);
  99int ocfs2_global_write_info(struct super_block *sb, int type);
 100int ocfs2_global_read_dquot(struct dquot *dquot);
 101int __ocfs2_sync_dquot(struct dquot *dquot, int freeing);
 102static inline int ocfs2_sync_dquot(struct dquot *dquot)
 103{
 104        return __ocfs2_sync_dquot(dquot, 0);
 105}
 106static inline int ocfs2_global_release_dquot(struct dquot *dquot)
 107{
 108        return __ocfs2_sync_dquot(dquot, 1);
 109}
 110
 111int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
 112void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
 113int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh);
 114int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
 115                                struct buffer_head **bh);
 116int ocfs2_create_local_dquot(struct dquot *dquot);
 117int ocfs2_local_release_dquot(handle_t *handle, struct dquot *dquot);
 118int ocfs2_local_write_dquot(struct dquot *dquot);
 119void ocfs2_drop_dquot_refs(struct work_struct *work);
 120
 121extern const struct dquot_operations ocfs2_quota_operations;
 122extern struct quota_format_type ocfs2_quota_format;
 123
 124#endif /* _OCFS2_QUOTA_H */
 125