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578 lines
17 KiB
578 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. |
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* All Rights Reserved. |
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*/ |
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#ifndef __XFS_INODE_H__ |
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#define __XFS_INODE_H__ |
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|
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#include "xfs_inode_buf.h" |
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#include "xfs_inode_fork.h" |
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|
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/* |
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* Kernel only inode definitions |
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*/ |
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struct xfs_dinode; |
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struct xfs_inode; |
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struct xfs_buf; |
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struct xfs_bmbt_irec; |
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struct xfs_inode_log_item; |
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struct xfs_mount; |
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struct xfs_trans; |
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struct xfs_dquot; |
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typedef struct xfs_inode { |
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/* Inode linking and identification information. */ |
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struct xfs_mount *i_mount; /* fs mount struct ptr */ |
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struct xfs_dquot *i_udquot; /* user dquot */ |
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struct xfs_dquot *i_gdquot; /* group dquot */ |
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struct xfs_dquot *i_pdquot; /* project dquot */ |
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/* Inode location stuff */ |
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xfs_ino_t i_ino; /* inode number (agno/agino)*/ |
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struct xfs_imap i_imap; /* location for xfs_imap() */ |
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/* Extent information. */ |
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struct xfs_ifork *i_cowfp; /* copy on write extents */ |
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struct xfs_ifork i_df; /* data fork */ |
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struct xfs_ifork i_af; /* attribute fork */ |
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/* Transaction and locking information. */ |
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struct xfs_inode_log_item *i_itemp; /* logging information */ |
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mrlock_t i_lock; /* inode lock */ |
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atomic_t i_pincount; /* inode pin count */ |
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struct llist_node i_gclist; /* deferred inactivation list */ |
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/* |
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* Bitsets of inode metadata that have been checked and/or are sick. |
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* Callers must hold i_flags_lock before accessing this field. |
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*/ |
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uint16_t i_checked; |
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uint16_t i_sick; |
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spinlock_t i_flags_lock; /* inode i_flags lock */ |
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/* Miscellaneous state. */ |
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unsigned long i_flags; /* see defined flags below */ |
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uint64_t i_delayed_blks; /* count of delay alloc blks */ |
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xfs_fsize_t i_disk_size; /* number of bytes in file */ |
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xfs_rfsblock_t i_nblocks; /* # of direct & btree blocks */ |
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prid_t i_projid; /* owner's project id */ |
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xfs_extlen_t i_extsize; /* basic/minimum extent size */ |
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/* cowextsize is only used for v3 inodes, flushiter for v1/2 */ |
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union { |
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xfs_extlen_t i_cowextsize; /* basic cow extent size */ |
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uint16_t i_flushiter; /* incremented on flush */ |
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}; |
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uint8_t i_forkoff; /* attr fork offset >> 3 */ |
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uint16_t i_diflags; /* XFS_DIFLAG_... */ |
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uint64_t i_diflags2; /* XFS_DIFLAG2_... */ |
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struct timespec64 i_crtime; /* time created */ |
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/* unlinked list pointers */ |
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xfs_agino_t i_next_unlinked; |
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xfs_agino_t i_prev_unlinked; |
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/* VFS inode */ |
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struct inode i_vnode; /* embedded VFS inode */ |
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/* pending io completions */ |
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spinlock_t i_ioend_lock; |
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struct work_struct i_ioend_work; |
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struct list_head i_ioend_list; |
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} xfs_inode_t; |
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static inline bool xfs_inode_has_attr_fork(struct xfs_inode *ip) |
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{ |
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return ip->i_forkoff > 0; |
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} |
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static inline struct xfs_ifork * |
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xfs_ifork_ptr( |
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struct xfs_inode *ip, |
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int whichfork) |
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{ |
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switch (whichfork) { |
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case XFS_DATA_FORK: |
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return &ip->i_df; |
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case XFS_ATTR_FORK: |
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if (!xfs_inode_has_attr_fork(ip)) |
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return NULL; |
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return &ip->i_af; |
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case XFS_COW_FORK: |
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return ip->i_cowfp; |
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default: |
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ASSERT(0); |
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return NULL; |
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} |
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} |
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static inline unsigned int xfs_inode_fork_boff(struct xfs_inode *ip) |
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{ |
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return ip->i_forkoff << 3; |
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} |
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static inline unsigned int xfs_inode_data_fork_size(struct xfs_inode *ip) |
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{ |
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if (xfs_inode_has_attr_fork(ip)) |
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return xfs_inode_fork_boff(ip); |
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return XFS_LITINO(ip->i_mount); |
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} |
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static inline unsigned int xfs_inode_attr_fork_size(struct xfs_inode *ip) |
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{ |
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if (xfs_inode_has_attr_fork(ip)) |
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return XFS_LITINO(ip->i_mount) - xfs_inode_fork_boff(ip); |
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return 0; |
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} |
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static inline unsigned int |
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xfs_inode_fork_size( |
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struct xfs_inode *ip, |
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int whichfork) |
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{ |
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switch (whichfork) { |
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case XFS_DATA_FORK: |
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return xfs_inode_data_fork_size(ip); |
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case XFS_ATTR_FORK: |
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return xfs_inode_attr_fork_size(ip); |
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default: |
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return 0; |
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} |
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} |
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/* Convert from vfs inode to xfs inode */ |
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static inline struct xfs_inode *XFS_I(struct inode *inode) |
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{ |
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return container_of(inode, struct xfs_inode, i_vnode); |
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} |
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/* convert from xfs inode to vfs inode */ |
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static inline struct inode *VFS_I(struct xfs_inode *ip) |
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{ |
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return &ip->i_vnode; |
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} |
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/* |
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* For regular files we only update the on-disk filesize when actually |
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* writing data back to disk. Until then only the copy in the VFS inode |
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* is uptodate. |
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*/ |
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static inline xfs_fsize_t XFS_ISIZE(struct xfs_inode *ip) |
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{ |
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if (S_ISREG(VFS_I(ip)->i_mode)) |
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return i_size_read(VFS_I(ip)); |
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return ip->i_disk_size; |
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} |
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/* |
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* If this I/O goes past the on-disk inode size update it unless it would |
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* be past the current in-core inode size. |
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*/ |
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static inline xfs_fsize_t |
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xfs_new_eof(struct xfs_inode *ip, xfs_fsize_t new_size) |
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{ |
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xfs_fsize_t i_size = i_size_read(VFS_I(ip)); |
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if (new_size > i_size || new_size < 0) |
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new_size = i_size; |
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return new_size > ip->i_disk_size ? new_size : 0; |
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} |
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/* |
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* i_flags helper functions |
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*/ |
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static inline void |
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__xfs_iflags_set(xfs_inode_t *ip, unsigned short flags) |
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{ |
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ip->i_flags |= flags; |
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} |
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static inline void |
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xfs_iflags_set(xfs_inode_t *ip, unsigned short flags) |
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{ |
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spin_lock(&ip->i_flags_lock); |
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__xfs_iflags_set(ip, flags); |
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spin_unlock(&ip->i_flags_lock); |
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} |
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static inline void |
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xfs_iflags_clear(xfs_inode_t *ip, unsigned short flags) |
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{ |
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spin_lock(&ip->i_flags_lock); |
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ip->i_flags &= ~flags; |
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spin_unlock(&ip->i_flags_lock); |
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} |
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static inline int |
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__xfs_iflags_test(xfs_inode_t *ip, unsigned short flags) |
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{ |
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return (ip->i_flags & flags); |
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} |
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static inline int |
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xfs_iflags_test(xfs_inode_t *ip, unsigned short flags) |
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{ |
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int ret; |
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spin_lock(&ip->i_flags_lock); |
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ret = __xfs_iflags_test(ip, flags); |
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spin_unlock(&ip->i_flags_lock); |
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return ret; |
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} |
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static inline int |
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xfs_iflags_test_and_clear(xfs_inode_t *ip, unsigned short flags) |
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{ |
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int ret; |
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spin_lock(&ip->i_flags_lock); |
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ret = ip->i_flags & flags; |
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if (ret) |
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ip->i_flags &= ~flags; |
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spin_unlock(&ip->i_flags_lock); |
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return ret; |
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} |
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static inline int |
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xfs_iflags_test_and_set(xfs_inode_t *ip, unsigned short flags) |
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{ |
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int ret; |
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spin_lock(&ip->i_flags_lock); |
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ret = ip->i_flags & flags; |
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if (!ret) |
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ip->i_flags |= flags; |
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spin_unlock(&ip->i_flags_lock); |
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return ret; |
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} |
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static inline prid_t |
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xfs_get_initial_prid(struct xfs_inode *dp) |
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{ |
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if (dp->i_diflags & XFS_DIFLAG_PROJINHERIT) |
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return dp->i_projid; |
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return XFS_PROJID_DEFAULT; |
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} |
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static inline bool xfs_is_reflink_inode(struct xfs_inode *ip) |
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{ |
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return ip->i_diflags2 & XFS_DIFLAG2_REFLINK; |
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} |
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static inline bool xfs_is_metadata_inode(struct xfs_inode *ip) |
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{ |
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struct xfs_mount *mp = ip->i_mount; |
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return ip == mp->m_rbmip || ip == mp->m_rsumip || |
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xfs_is_quota_inode(&mp->m_sb, ip->i_ino); |
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} |
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/* |
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* Check if an inode has any data in the COW fork. This might be often false |
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* even for inodes with the reflink flag when there is no pending COW operation. |
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*/ |
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static inline bool xfs_inode_has_cow_data(struct xfs_inode *ip) |
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{ |
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return ip->i_cowfp && ip->i_cowfp->if_bytes; |
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} |
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static inline bool xfs_inode_has_bigtime(struct xfs_inode *ip) |
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{ |
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return ip->i_diflags2 & XFS_DIFLAG2_BIGTIME; |
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} |
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static inline bool xfs_inode_has_large_extent_counts(struct xfs_inode *ip) |
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{ |
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return ip->i_diflags2 & XFS_DIFLAG2_NREXT64; |
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} |
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/* |
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* Return the buftarg used for data allocations on a given inode. |
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*/ |
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#define xfs_inode_buftarg(ip) \ |
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(XFS_IS_REALTIME_INODE(ip) ? \ |
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(ip)->i_mount->m_rtdev_targp : (ip)->i_mount->m_ddev_targp) |
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/* |
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* In-core inode flags. |
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*/ |
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#define XFS_IRECLAIM (1 << 0) /* started reclaiming this inode */ |
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#define XFS_ISTALE (1 << 1) /* inode has been staled */ |
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#define XFS_IRECLAIMABLE (1 << 2) /* inode can be reclaimed */ |
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#define XFS_INEW (1 << 3) /* inode has just been allocated */ |
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#define XFS_IPRESERVE_DM_FIELDS (1 << 4) /* has legacy DMAPI fields set */ |
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#define XFS_ITRUNCATED (1 << 5) /* truncated down so flush-on-close */ |
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#define XFS_IDIRTY_RELEASE (1 << 6) /* dirty release already seen */ |
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#define XFS_IFLUSHING (1 << 7) /* inode is being flushed */ |
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#define __XFS_IPINNED_BIT 8 /* wakeup key for zero pin count */ |
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#define XFS_IPINNED (1 << __XFS_IPINNED_BIT) |
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#define XFS_IEOFBLOCKS (1 << 9) /* has the preallocblocks tag set */ |
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#define XFS_NEED_INACTIVE (1 << 10) /* see XFS_INACTIVATING below */ |
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/* |
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* If this unlinked inode is in the middle of recovery, don't let drop_inode |
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* truncate and free the inode. This can happen if we iget the inode during |
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* log recovery to replay a bmap operation on the inode. |
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*/ |
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#define XFS_IRECOVERY (1 << 11) |
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#define XFS_ICOWBLOCKS (1 << 12)/* has the cowblocks tag set */ |
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/* |
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* If we need to update on-disk metadata before this IRECLAIMABLE inode can be |
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* freed, then NEED_INACTIVE will be set. Once we start the updates, the |
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* INACTIVATING bit will be set to keep iget away from this inode. After the |
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* inactivation completes, both flags will be cleared and the inode is a |
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* plain old IRECLAIMABLE inode. |
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*/ |
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#define XFS_INACTIVATING (1 << 13) |
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/* All inode state flags related to inode reclaim. */ |
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#define XFS_ALL_IRECLAIM_FLAGS (XFS_IRECLAIMABLE | \ |
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XFS_IRECLAIM | \ |
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XFS_NEED_INACTIVE | \ |
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XFS_INACTIVATING) |
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/* |
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* Per-lifetime flags need to be reset when re-using a reclaimable inode during |
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* inode lookup. This prevents unintended behaviour on the new inode from |
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* ocurring. |
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*/ |
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#define XFS_IRECLAIM_RESET_FLAGS \ |
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(XFS_IRECLAIMABLE | XFS_IRECLAIM | \ |
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XFS_IDIRTY_RELEASE | XFS_ITRUNCATED | XFS_NEED_INACTIVE | \ |
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XFS_INACTIVATING) |
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/* |
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* Flags for inode locking. |
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* Bit ranges: 1<<1 - 1<<16-1 -- iolock/ilock modes (bitfield) |
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* 1<<16 - 1<<32-1 -- lockdep annotation (integers) |
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*/ |
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#define XFS_IOLOCK_EXCL (1u << 0) |
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#define XFS_IOLOCK_SHARED (1u << 1) |
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#define XFS_ILOCK_EXCL (1u << 2) |
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#define XFS_ILOCK_SHARED (1u << 3) |
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#define XFS_MMAPLOCK_EXCL (1u << 4) |
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#define XFS_MMAPLOCK_SHARED (1u << 5) |
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#define XFS_LOCK_MASK (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \ |
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| XFS_ILOCK_EXCL | XFS_ILOCK_SHARED \ |
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| XFS_MMAPLOCK_EXCL | XFS_MMAPLOCK_SHARED) |
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#define XFS_LOCK_FLAGS \ |
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{ XFS_IOLOCK_EXCL, "IOLOCK_EXCL" }, \ |
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{ XFS_IOLOCK_SHARED, "IOLOCK_SHARED" }, \ |
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{ XFS_ILOCK_EXCL, "ILOCK_EXCL" }, \ |
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{ XFS_ILOCK_SHARED, "ILOCK_SHARED" }, \ |
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{ XFS_MMAPLOCK_EXCL, "MMAPLOCK_EXCL" }, \ |
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{ XFS_MMAPLOCK_SHARED, "MMAPLOCK_SHARED" } |
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/* |
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* Flags for lockdep annotations. |
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* |
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* XFS_LOCK_PARENT - for directory operations that require locking a |
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* parent directory inode and a child entry inode. IOLOCK requires nesting, |
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* MMAPLOCK does not support this class, ILOCK requires a single subclass |
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* to differentiate parent from child. |
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* |
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* XFS_LOCK_RTBITMAP/XFS_LOCK_RTSUM - the realtime device bitmap and summary |
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* inodes do not participate in the normal lock order, and thus have their |
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* own subclasses. |
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* |
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* XFS_LOCK_INUMORDER - for locking several inodes at the some time |
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* with xfs_lock_inodes(). This flag is used as the starting subclass |
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* and each subsequent lock acquired will increment the subclass by one. |
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* However, MAX_LOCKDEP_SUBCLASSES == 8, which means we are greatly |
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* limited to the subclasses we can represent via nesting. We need at least |
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* 5 inodes nest depth for the ILOCK through rename, and we also have to support |
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* XFS_ILOCK_PARENT, which gives 6 subclasses. Then we have XFS_ILOCK_RTBITMAP |
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* and XFS_ILOCK_RTSUM, which are another 2 unique subclasses, so that's all |
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* 8 subclasses supported by lockdep. |
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* |
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* This also means we have to number the sub-classes in the lowest bits of |
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* the mask we keep, and we have to ensure we never exceed 3 bits of lockdep |
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* mask and we can't use bit-masking to build the subclasses. What a mess. |
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* |
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* Bit layout: |
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* |
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* Bit Lock Region |
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* 16-19 XFS_IOLOCK_SHIFT dependencies |
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* 20-23 XFS_MMAPLOCK_SHIFT dependencies |
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* 24-31 XFS_ILOCK_SHIFT dependencies |
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* |
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* IOLOCK values |
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* |
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* 0-3 subclass value |
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* 4-7 unused |
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* |
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* MMAPLOCK values |
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* |
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* 0-3 subclass value |
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* 4-7 unused |
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* |
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* ILOCK values |
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* 0-4 subclass values |
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* 5 PARENT subclass (not nestable) |
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* 6 RTBITMAP subclass (not nestable) |
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* 7 RTSUM subclass (not nestable) |
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* |
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*/ |
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#define XFS_IOLOCK_SHIFT 16 |
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#define XFS_IOLOCK_MAX_SUBCLASS 3 |
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#define XFS_IOLOCK_DEP_MASK 0x000f0000u |
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#define XFS_MMAPLOCK_SHIFT 20 |
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#define XFS_MMAPLOCK_NUMORDER 0 |
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#define XFS_MMAPLOCK_MAX_SUBCLASS 3 |
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#define XFS_MMAPLOCK_DEP_MASK 0x00f00000u |
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#define XFS_ILOCK_SHIFT 24 |
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#define XFS_ILOCK_PARENT_VAL 5u |
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#define XFS_ILOCK_MAX_SUBCLASS (XFS_ILOCK_PARENT_VAL - 1) |
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#define XFS_ILOCK_RTBITMAP_VAL 6u |
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#define XFS_ILOCK_RTSUM_VAL 7u |
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#define XFS_ILOCK_DEP_MASK 0xff000000u |
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#define XFS_ILOCK_PARENT (XFS_ILOCK_PARENT_VAL << XFS_ILOCK_SHIFT) |
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#define XFS_ILOCK_RTBITMAP (XFS_ILOCK_RTBITMAP_VAL << XFS_ILOCK_SHIFT) |
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#define XFS_ILOCK_RTSUM (XFS_ILOCK_RTSUM_VAL << XFS_ILOCK_SHIFT) |
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#define XFS_LOCK_SUBCLASS_MASK (XFS_IOLOCK_DEP_MASK | \ |
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XFS_MMAPLOCK_DEP_MASK | \ |
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XFS_ILOCK_DEP_MASK) |
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#define XFS_IOLOCK_DEP(flags) (((flags) & XFS_IOLOCK_DEP_MASK) \ |
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>> XFS_IOLOCK_SHIFT) |
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#define XFS_MMAPLOCK_DEP(flags) (((flags) & XFS_MMAPLOCK_DEP_MASK) \ |
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>> XFS_MMAPLOCK_SHIFT) |
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#define XFS_ILOCK_DEP(flags) (((flags) & XFS_ILOCK_DEP_MASK) \ |
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>> XFS_ILOCK_SHIFT) |
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/* |
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* Layouts are broken in the BREAK_WRITE case to ensure that |
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* layout-holders do not collide with local writes. Additionally, |
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* layouts are broken in the BREAK_UNMAP case to make sure the |
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* layout-holder has a consistent view of the file's extent map. While |
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* BREAK_WRITE breaks can be satisfied by recalling FL_LAYOUT leases, |
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* BREAK_UNMAP breaks additionally require waiting for busy dax-pages to |
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* go idle. |
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*/ |
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enum layout_break_reason { |
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BREAK_WRITE, |
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BREAK_UNMAP, |
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}; |
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|
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/* |
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* For multiple groups support: if S_ISGID bit is set in the parent |
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* directory, group of new file is set to that of the parent, and |
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* new subdirectory gets S_ISGID bit from parent. |
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*/ |
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#define XFS_INHERIT_GID(pip) \ |
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(xfs_has_grpid((pip)->i_mount) || (VFS_I(pip)->i_mode & S_ISGID)) |
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int xfs_release(struct xfs_inode *ip); |
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void xfs_inactive(struct xfs_inode *ip); |
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int xfs_lookup(struct xfs_inode *dp, const struct xfs_name *name, |
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struct xfs_inode **ipp, struct xfs_name *ci_name); |
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int xfs_create(struct user_namespace *mnt_userns, |
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struct xfs_inode *dp, struct xfs_name *name, |
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umode_t mode, dev_t rdev, bool need_xattr, |
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struct xfs_inode **ipp); |
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int xfs_create_tmpfile(struct user_namespace *mnt_userns, |
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struct xfs_inode *dp, umode_t mode, |
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struct xfs_inode **ipp); |
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int xfs_remove(struct xfs_inode *dp, struct xfs_name *name, |
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struct xfs_inode *ip); |
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int xfs_link(struct xfs_inode *tdp, struct xfs_inode *sip, |
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struct xfs_name *target_name); |
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int xfs_rename(struct user_namespace *mnt_userns, |
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struct xfs_inode *src_dp, struct xfs_name *src_name, |
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struct xfs_inode *src_ip, struct xfs_inode *target_dp, |
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struct xfs_name *target_name, |
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struct xfs_inode *target_ip, unsigned int flags); |
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|
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void xfs_ilock(xfs_inode_t *, uint); |
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int xfs_ilock_nowait(xfs_inode_t *, uint); |
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void xfs_iunlock(xfs_inode_t *, uint); |
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void xfs_ilock_demote(xfs_inode_t *, uint); |
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bool xfs_isilocked(struct xfs_inode *, uint); |
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uint xfs_ilock_data_map_shared(struct xfs_inode *); |
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uint xfs_ilock_attr_map_shared(struct xfs_inode *); |
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|
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uint xfs_ip2xflags(struct xfs_inode *); |
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int xfs_ifree(struct xfs_trans *, struct xfs_inode *); |
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int xfs_itruncate_extents_flags(struct xfs_trans **, |
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struct xfs_inode *, int, xfs_fsize_t, int); |
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void xfs_iext_realloc(xfs_inode_t *, int, int); |
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int xfs_log_force_inode(struct xfs_inode *ip); |
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void xfs_iunpin_wait(xfs_inode_t *); |
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#define xfs_ipincount(ip) ((unsigned int) atomic_read(&ip->i_pincount)) |
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int xfs_iflush_cluster(struct xfs_buf *); |
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void xfs_lock_two_inodes(struct xfs_inode *ip0, uint ip0_mode, |
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struct xfs_inode *ip1, uint ip1_mode); |
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xfs_extlen_t xfs_get_extsz_hint(struct xfs_inode *ip); |
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xfs_extlen_t xfs_get_cowextsz_hint(struct xfs_inode *ip); |
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|
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int xfs_init_new_inode(struct user_namespace *mnt_userns, struct xfs_trans *tp, |
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struct xfs_inode *pip, xfs_ino_t ino, umode_t mode, |
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xfs_nlink_t nlink, dev_t rdev, prid_t prid, bool init_xattrs, |
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struct xfs_inode **ipp); |
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|
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static inline int |
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xfs_itruncate_extents( |
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struct xfs_trans **tpp, |
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struct xfs_inode *ip, |
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int whichfork, |
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xfs_fsize_t new_size) |
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{ |
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return xfs_itruncate_extents_flags(tpp, ip, whichfork, new_size, 0); |
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} |
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|
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/* from xfs_file.c */ |
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int xfs_break_dax_layouts(struct inode *inode, bool *retry); |
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int xfs_break_layouts(struct inode *inode, uint *iolock, |
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enum layout_break_reason reason); |
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|
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/* from xfs_iops.c */ |
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extern void xfs_setup_inode(struct xfs_inode *ip); |
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extern void xfs_setup_iops(struct xfs_inode *ip); |
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extern void xfs_diflags_to_iflags(struct xfs_inode *ip, bool init); |
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|
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/* |
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* When setting up a newly allocated inode, we need to call |
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* xfs_finish_inode_setup() once the inode is fully instantiated at |
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* the VFS level to prevent the rest of the world seeing the inode |
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* before we've completed instantiation. Otherwise we can do it |
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* the moment the inode lookup is complete. |
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*/ |
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static inline void xfs_finish_inode_setup(struct xfs_inode *ip) |
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{ |
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xfs_iflags_clear(ip, XFS_INEW); |
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barrier(); |
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unlock_new_inode(VFS_I(ip)); |
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} |
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|
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static inline void xfs_setup_existing_inode(struct xfs_inode *ip) |
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{ |
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xfs_setup_inode(ip); |
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xfs_setup_iops(ip); |
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xfs_finish_inode_setup(ip); |
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} |
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|
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void xfs_irele(struct xfs_inode *ip); |
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|
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extern struct kmem_cache *xfs_inode_cache; |
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|
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/* The default CoW extent size hint. */ |
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#define XFS_DEFAULT_COWEXTSZ_HINT 32 |
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|
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bool xfs_inode_needs_inactive(struct xfs_inode *ip); |
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|
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void xfs_end_io(struct work_struct *work); |
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|
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int xfs_ilock2_io_mmap(struct xfs_inode *ip1, struct xfs_inode *ip2); |
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void xfs_iunlock2_io_mmap(struct xfs_inode *ip1, struct xfs_inode *ip2); |
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|
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#endif /* __XFS_INODE_H__ */
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