| Jan Kara | 9e33d69 | 2008-08-25 19:56:50 +0200 | [diff] [blame] | 1 | /* |
| 2 | * quota.h for OCFS2 |
| 3 | * |
| 4 | * On disk quota structures for local and global quota file, in-memory |
| 5 | * structures. |
| 6 | * |
| 7 | */ |
| 8 | |
| 9 | #ifndef _OCFS2_QUOTA_H |
| 10 | #define _OCFS2_QUOTA_H |
| 11 | |
| 12 | #include <linux/types.h> |
| 13 | #include <linux/slab.h> |
| 14 | #include <linux/quota.h> |
| 15 | #include <linux/list.h> |
| 16 | #include <linux/dqblk_qtree.h> |
| 17 | |
| 18 | #include "ocfs2.h" |
| 19 | |
| 20 | /* Common stuff */ |
| 21 | /* id number of quota format */ |
| 22 | #define QFMT_OCFS2 3 |
| 23 | |
| 24 | /* |
| 25 | * In-memory structures |
| 26 | */ |
| 27 | struct ocfs2_dquot { |
| 28 | struct dquot dq_dquot; /* Generic VFS dquot */ |
| 29 | loff_t dq_local_off; /* Offset in the local quota file */ |
| 30 | struct ocfs2_quota_chunk *dq_chunk; /* Chunk dquot is in */ |
| 31 | unsigned int dq_use_count; /* Number of nodes having reference to this entry in global quota file */ |
| 32 | s64 dq_origspace; /* Last globally synced space usage */ |
| 33 | s64 dq_originodes; /* Last globally synced inode usage */ |
| 34 | }; |
| 35 | |
| 36 | /* In-memory structure with quota header information */ |
| 37 | struct ocfs2_mem_dqinfo { |
| 38 | unsigned int dqi_type; /* Quota type this structure describes */ |
| 39 | unsigned int dqi_chunks; /* Number of chunks in local quota file */ |
| 40 | unsigned int dqi_blocks; /* Number of blocks allocated for local quota file */ |
| 41 | unsigned int dqi_syncms; /* How often should we sync with other nodes */ |
| 42 | struct list_head dqi_chunk; /* List of chunks */ |
| 43 | struct inode *dqi_gqinode; /* Global quota file inode */ |
| 44 | struct ocfs2_lock_res dqi_gqlock; /* Lock protecting quota information structure */ |
| 45 | struct buffer_head *dqi_gqi_bh; /* Buffer head with global quota file inode - set only if inode lock is obtained */ |
| 46 | int dqi_gqi_count; /* Number of holders of dqi_gqi_bh */ |
| 47 | struct buffer_head *dqi_lqi_bh; /* Buffer head with local quota file inode */ |
| 48 | struct buffer_head *dqi_ibh; /* Buffer with information header */ |
| 49 | struct qtree_mem_dqinfo dqi_gi; /* Info about global file */ |
| 50 | }; |
| 51 | |
| 52 | static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot) |
| 53 | { |
| 54 | return container_of(dquot, struct ocfs2_dquot, dq_dquot); |
| 55 | } |
| 56 | |
| 57 | struct ocfs2_quota_chunk { |
| 58 | struct list_head qc_chunk; /* List of quotafile chunks */ |
| 59 | int qc_num; /* Number of quota chunk */ |
| 60 | struct buffer_head *qc_headerbh; /* Buffer head with chunk header */ |
| 61 | }; |
| 62 | |
| 63 | extern struct kmem_cache *ocfs2_dquot_cachep; |
| 64 | extern struct kmem_cache *ocfs2_qf_chunk_cachep; |
| 65 | |
| 66 | extern struct qtree_fmt_operations ocfs2_global_ops; |
| 67 | |
| 68 | ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data, |
| 69 | size_t len, loff_t off); |
| 70 | ssize_t ocfs2_quota_write(struct super_block *sb, int type, |
| 71 | const char *data, size_t len, loff_t off); |
| 72 | int ocfs2_global_read_info(struct super_block *sb, int type); |
| 73 | int ocfs2_global_write_info(struct super_block *sb, int type); |
| 74 | int ocfs2_global_read_dquot(struct dquot *dquot); |
| 75 | int __ocfs2_sync_dquot(struct dquot *dquot, int freeing); |
| 76 | static inline int ocfs2_sync_dquot(struct dquot *dquot) |
| 77 | { |
| 78 | return __ocfs2_sync_dquot(dquot, 0); |
| 79 | } |
| 80 | static inline int ocfs2_global_release_dquot(struct dquot *dquot) |
| 81 | { |
| 82 | return __ocfs2_sync_dquot(dquot, 1); |
| 83 | } |
| 84 | |
| 85 | int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex); |
| 86 | void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex); |
| 87 | struct buffer_head *ocfs2_read_quota_block(struct inode *inode, |
| 88 | int block, int *err); |
| 89 | |
| 90 | extern struct dquot_operations ocfs2_quota_operations; |
| 91 | extern struct quota_format_type ocfs2_quota_format; |
| 92 | |
| 93 | #endif /* _OCFS2_QUOTA_H */ |