495 lines
15 KiB
C
495 lines
15 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_INODE_H__
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#define __XFS_INODE_H__
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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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* 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_defer_ops;
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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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xfs_ifork_t *i_afp; /* attribute fork pointer */
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xfs_ifork_t *i_cowfp; /* copy on write extents */
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xfs_ifork_t i_df; /* data fork */
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/* operations vectors */
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const struct xfs_dir_ops *d_ops; /* directory ops vector */
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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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mrlock_t i_mmaplock; /* inode mmap IO lock */
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atomic_t i_pincount; /* inode pin count */
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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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unsigned int i_delayed_blks; /* count of delay alloc blks */
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struct xfs_icdinode i_d; /* most of ondisk inode */
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xfs_extnum_t i_cnextents; /* # of extents in cow fork */
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unsigned int i_cformat; /* format of cow fork */
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/* VFS inode */
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struct inode i_vnode; /* embedded VFS inode */
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} xfs_inode_t;
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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_d.di_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_d.di_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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/*
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* Project quota id helpers (previously projid was 16bit only
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* and using two 16bit values to hold new 32bit projid was chosen
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* to retain compatibility with "old" filesystems).
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*/
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static inline prid_t
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xfs_get_projid(struct xfs_inode *ip)
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{
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return (prid_t)ip->i_d.di_projid_hi << 16 | ip->i_d.di_projid_lo;
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}
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static inline void
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xfs_set_projid(struct xfs_inode *ip,
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prid_t projid)
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{
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ip->i_d.di_projid_hi = (uint16_t) (projid >> 16);
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ip->i_d.di_projid_lo = (uint16_t) (projid & 0xffff);
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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_d.di_flags & XFS_DIFLAG_PROJINHERIT)
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return xfs_get_projid(dp);
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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_d.di_flags2 & XFS_DIFLAG2_REFLINK;
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}
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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_BIT 3 /* inode has just been allocated */
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#define XFS_INEW (1 << __XFS_INEW_BIT)
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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_IFLOCK_BIT 7 /* inode is being flushed right now */
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#define XFS_IFLOCK (1 << __XFS_IFLOCK_BIT)
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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_IDONTCACHE (1 << 9) /* don't cache the inode long term */
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#define XFS_IEOFBLOCKS (1 << 10)/* has the preallocblocks tag set */
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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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* 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)
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/*
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* Synchronize processes attempting to flush the in-core inode back to disk.
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*/
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static inline int xfs_isiflocked(struct xfs_inode *ip)
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{
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return xfs_iflags_test(ip, XFS_IFLOCK);
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}
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extern void __xfs_iflock(struct xfs_inode *ip);
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static inline int xfs_iflock_nowait(struct xfs_inode *ip)
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{
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return !xfs_iflags_test_and_set(ip, XFS_IFLOCK);
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}
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static inline void xfs_iflock(struct xfs_inode *ip)
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{
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if (!xfs_iflock_nowait(ip))
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__xfs_iflock(ip);
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}
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static inline void xfs_ifunlock(struct xfs_inode *ip)
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{
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ASSERT(xfs_isiflocked(ip));
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xfs_iflags_clear(ip, XFS_IFLOCK);
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smp_mb();
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wake_up_bit(&ip->i_flags, __XFS_IFLOCK_BIT);
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}
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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 (1<<0)
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#define XFS_IOLOCK_SHARED (1<<1)
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#define XFS_ILOCK_EXCL (1<<2)
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#define XFS_ILOCK_SHARED (1<<3)
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#define XFS_MMAPLOCK_EXCL (1<<4)
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#define XFS_MMAPLOCK_SHARED (1<<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 0x000f0000
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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 0x00f00000
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#define XFS_ILOCK_SHIFT 24
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#define XFS_ILOCK_PARENT_VAL 5
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#define XFS_ILOCK_MAX_SUBCLASS (XFS_ILOCK_PARENT_VAL - 1)
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#define XFS_ILOCK_RTBITMAP_VAL 6
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#define XFS_ILOCK_RTSUM_VAL 7
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#define XFS_ILOCK_DEP_MASK 0xff000000
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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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* 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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(((pip)->i_mount->m_flags & XFS_MOUNT_GRPID) || \
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(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, 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 xfs_inode *dp, struct xfs_name *name,
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umode_t mode, dev_t rdev, struct xfs_inode **ipp);
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int xfs_create_tmpfile(struct xfs_inode *dp, struct dentry *dentry,
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umode_t mode, 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 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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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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int xfs_isilocked(xfs_inode_t *, 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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uint xfs_ip2xflags(struct xfs_inode *);
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int xfs_ifree(struct xfs_trans *, xfs_inode_t *,
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struct xfs_defer_ops *);
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int xfs_itruncate_extents(struct xfs_trans **, struct xfs_inode *,
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int, xfs_fsize_t);
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void xfs_iext_realloc(xfs_inode_t *, int, int);
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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(struct xfs_inode *, struct xfs_buf **);
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void xfs_lock_two_inodes(xfs_inode_t *, xfs_inode_t *, uint);
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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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int xfs_dir_ialloc(struct xfs_trans **, struct xfs_inode *, umode_t,
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xfs_nlink_t, dev_t, prid_t,
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struct xfs_inode **, int *);
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/* from xfs_file.c */
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enum xfs_prealloc_flags {
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XFS_PREALLOC_SET = (1 << 1),
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XFS_PREALLOC_CLEAR = (1 << 2),
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XFS_PREALLOC_SYNC = (1 << 3),
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XFS_PREALLOC_INVISIBLE = (1 << 4),
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};
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int xfs_update_prealloc_flags(struct xfs_inode *ip,
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enum xfs_prealloc_flags flags);
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int xfs_zero_eof(struct xfs_inode *ip, xfs_off_t offset,
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xfs_fsize_t isize, bool *did_zeroing);
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int xfs_zero_range(struct xfs_inode *ip, xfs_off_t pos, xfs_off_t count,
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bool *did_zero);
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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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|
|
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/*
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|
* When setting up a newly allocated inode, we need to call
|
|
* xfs_finish_inode_setup() once the inode is fully instantiated at
|
|
* the VFS level to prevent the rest of the world seeing the inode
|
|
* before we've completed instantiation. Otherwise we can do it
|
|
* 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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|
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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|
wake_up_bit(&ip->i_flags, __XFS_INEW_BIT);
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|
}
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|
|
|
static inline void xfs_setup_existing_inode(struct xfs_inode *ip)
|
|
{
|
|
xfs_setup_inode(ip);
|
|
xfs_setup_iops(ip);
|
|
xfs_finish_inode_setup(ip);
|
|
}
|
|
|
|
#define IHOLD(ip) \
|
|
do { \
|
|
ASSERT(atomic_read(&VFS_I(ip)->i_count) > 0) ; \
|
|
ihold(VFS_I(ip)); \
|
|
trace_xfs_ihold(ip, _THIS_IP_); \
|
|
} while (0)
|
|
|
|
#define IRELE(ip) \
|
|
do { \
|
|
trace_xfs_irele(ip, _THIS_IP_); \
|
|
iput(VFS_I(ip)); \
|
|
} while (0)
|
|
|
|
extern struct kmem_zone *xfs_inode_zone;
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|
|
|
/* The default CoW extent size hint. */
|
|
#define XFS_DEFAULT_COWEXTSZ_HINT 32
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|
|
|
#endif /* __XFS_INODE_H__ */
|