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f64dd44eb7
There is no need to map offset of local dquot structure to on disk block in each quota write. It is enough to map it just once and store the physical block number in quota structure in memory. Moreover this simplifies locking as we do not have to take ip_alloc_sem from quota write path. Acked-by: Joel Becker <Joel.Becker@oracle.com> Signed-off-by: Jan Kara <jack@suse.cz>
118 lines
4.2 KiB
C
118 lines
4.2 KiB
C
/*
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* quota.h for OCFS2
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*
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* On disk quota structures for local and global quota file, in-memory
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* structures.
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*
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*/
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#ifndef _OCFS2_QUOTA_H
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#define _OCFS2_QUOTA_H
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/quota.h>
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#include <linux/list.h>
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#include <linux/dqblk_qtree.h>
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#include "ocfs2.h"
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/*
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* In-memory structures
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*/
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struct ocfs2_dquot {
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struct dquot dq_dquot; /* Generic VFS dquot */
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loff_t dq_local_off; /* Offset in the local quota file */
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u64 dq_local_phys_blk; /* Physical block carrying quota structure */
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struct ocfs2_quota_chunk *dq_chunk; /* Chunk dquot is in */
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unsigned int dq_use_count; /* Number of nodes having reference to this entry in global quota file */
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s64 dq_origspace; /* Last globally synced space usage */
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s64 dq_originodes; /* Last globally synced inode usage */
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};
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/* Description of one chunk to recover in memory */
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struct ocfs2_recovery_chunk {
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struct list_head rc_list; /* List of chunks */
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int rc_chunk; /* Chunk number */
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unsigned long *rc_bitmap; /* Bitmap of entries to recover */
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};
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struct ocfs2_quota_recovery {
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struct list_head r_list[MAXQUOTAS]; /* List of chunks to recover */
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};
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/* In-memory structure with quota header information */
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struct ocfs2_mem_dqinfo {
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unsigned int dqi_type; /* Quota type this structure describes */
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unsigned int dqi_chunks; /* Number of chunks in local quota file */
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unsigned int dqi_blocks; /* Number of blocks allocated for local quota file */
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unsigned int dqi_syncms; /* How often should we sync with other nodes */
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struct list_head dqi_chunk; /* List of chunks */
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struct inode *dqi_gqinode; /* Global quota file inode */
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struct ocfs2_lock_res dqi_gqlock; /* Lock protecting quota information structure */
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struct buffer_head *dqi_gqi_bh; /* Buffer head with global quota file inode - set only if inode lock is obtained */
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int dqi_gqi_count; /* Number of holders of dqi_gqi_bh */
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struct buffer_head *dqi_lqi_bh; /* Buffer head with local quota file inode */
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struct buffer_head *dqi_ibh; /* Buffer with information header */
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struct qtree_mem_dqinfo dqi_gi; /* Info about global file */
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struct delayed_work dqi_sync_work; /* Work for syncing dquots */
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struct ocfs2_quota_recovery *dqi_rec; /* Pointer to recovery
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* information, in case we
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* enable quotas on file
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* needing it */
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};
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static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot)
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{
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return container_of(dquot, struct ocfs2_dquot, dq_dquot);
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}
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struct ocfs2_quota_chunk {
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struct list_head qc_chunk; /* List of quotafile chunks */
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int qc_num; /* Number of quota chunk */
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struct buffer_head *qc_headerbh; /* Buffer head with chunk header */
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};
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extern struct kmem_cache *ocfs2_dquot_cachep;
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extern struct kmem_cache *ocfs2_qf_chunk_cachep;
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extern struct qtree_fmt_operations ocfs2_global_ops;
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struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
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struct ocfs2_super *osb, int slot_num);
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int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
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struct ocfs2_quota_recovery *rec,
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int slot_num);
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void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec);
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ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
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size_t len, loff_t off);
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ssize_t ocfs2_quota_write(struct super_block *sb, int type,
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const char *data, size_t len, loff_t off);
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int ocfs2_global_read_info(struct super_block *sb, int type);
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int ocfs2_global_write_info(struct super_block *sb, int type);
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int ocfs2_global_read_dquot(struct dquot *dquot);
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int __ocfs2_sync_dquot(struct dquot *dquot, int freeing);
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static inline int ocfs2_sync_dquot(struct dquot *dquot)
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{
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return __ocfs2_sync_dquot(dquot, 0);
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}
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static inline int ocfs2_global_release_dquot(struct dquot *dquot)
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{
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return __ocfs2_sync_dquot(dquot, 1);
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}
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int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
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void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
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int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
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struct buffer_head **bh);
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int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
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struct buffer_head **bh);
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extern const struct dquot_operations ocfs2_quota_operations;
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extern struct quota_format_type ocfs2_quota_format;
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int ocfs2_quota_setup(void);
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void ocfs2_quota_shutdown(void);
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#endif /* _OCFS2_QUOTA_H */
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