e65f5a4ead
Provide a custom lock around initializing and tearing down EA area, to prevent both memory leaks and double-free of it. Count the number of EA area accessors. Lock protocol requires either holding exclusive vnode lock to modify i_ea_area, or shared vnode lock and owning IN_EA_LOCKED flag in i_flag. Noted by: YAMAMOTO, Taku <taku tackymt homeip net> Tested by: pho (previous version) MFC after: 2 weeks
190 lines
7.2 KiB
C
190 lines
7.2 KiB
C
/*-
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* Copyright (c) 1982, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)inode.h 8.9 (Berkeley) 5/14/95
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* $FreeBSD$
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*/
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#ifndef _UFS_UFS_INODE_H_
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#define _UFS_UFS_INODE_H_
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#include <sys/lock.h>
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#include <sys/queue.h>
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#include <ufs/ufs/dinode.h>
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/*
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* This must agree with the definition in <ufs/ufs/dir.h>.
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*/
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#define doff_t int32_t
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/*
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* The inode is used to describe each active (or recently active) file in the
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* UFS filesystem. It is composed of two types of information. The first part
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* is the information that is needed only while the file is active (such as
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* the identity of the file and linkage to speed its lookup). The second part
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* is the permanent meta-data associated with the file which is read in
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* from the permanent dinode from long term storage when the file becomes
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* active, and is put back when the file is no longer being used.
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*
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* An inode may only be changed while holding either the exclusive
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* vnode lock or the shared vnode lock and the vnode interlock. We use
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* the latter only for "read" and "get" operations that require
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* changing i_flag, or a timestamp. This locking protocol allows executing
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* those operations without having to upgrade the vnode lock from shared to
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* exclusive.
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*/
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struct inode {
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TAILQ_ENTRY(inode) i_nextsnap; /* snapshot file list. */
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struct vnode *i_vnode;/* Vnode associated with this inode. */
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struct ufsmount *i_ump;/* Ufsmount point associated with this inode. */
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u_int32_t i_flag; /* flags, see below */
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struct cdev *i_dev; /* Device associated with the inode. */
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ino_t i_number; /* The identity of the inode. */
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int i_effnlink; /* i_nlink when I/O completes */
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struct fs *i_fs; /* Associated filesystem superblock. */
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struct dquot *i_dquot[MAXQUOTAS]; /* Dquot structures. */
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u_quad_t i_modrev; /* Revision level for NFS lease. */
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/*
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* Side effects; used during directory lookup.
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*/
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int32_t i_count; /* Size of free slot in directory. */
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doff_t i_endoff; /* End of useful stuff in directory. */
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doff_t i_diroff; /* Offset in dir, where we found last entry. */
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doff_t i_offset; /* Offset of free space in directory. */
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union {
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struct dirhash *dirhash; /* Hashing for large directories. */
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daddr_t *snapblklist; /* Collect expunged snapshot blocks. */
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} i_un;
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/*
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* Data for extended attribute modification.
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*/
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u_char *i_ea_area; /* Pointer to malloced copy of EA area */
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unsigned i_ea_len; /* Length of i_ea_area */
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int i_ea_error; /* First errno in transaction */
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int i_ea_refs; /* Number of users of EA area */
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/*
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* Copies from the on-disk dinode itself.
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*/
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u_int16_t i_mode; /* IFMT, permissions; see below. */
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int16_t i_nlink; /* File link count. */
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u_int64_t i_size; /* File byte count. */
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u_int32_t i_flags; /* Status flags (chflags). */
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int64_t i_gen; /* Generation number. */
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u_int32_t i_uid; /* File owner. */
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u_int32_t i_gid; /* File group. */
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/*
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* The real copy of the on-disk inode.
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*/
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union {
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struct ufs1_dinode *din1; /* UFS1 on-disk dinode. */
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struct ufs2_dinode *din2; /* UFS2 on-disk dinode. */
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} dinode_u;
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};
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/*
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* These flags are kept in i_flag.
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*/
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#define IN_ACCESS 0x0001 /* Access time update request. */
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#define IN_CHANGE 0x0002 /* Inode change time update request. */
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#define IN_UPDATE 0x0004 /* Modification time update request. */
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#define IN_MODIFIED 0x0008 /* Inode has been modified. */
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#define IN_RENAME 0x0010 /* Inode is being renamed. */
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#define IN_LAZYMOD 0x0040 /* Modified, but don't write yet. */
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#define IN_SPACECOUNTED 0x0080 /* Blocks to be freed in free count. */
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#define IN_LAZYACCESS 0x0100 /* Process IN_ACCESS after the
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suspension finished */
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#define IN_EA_LOCKED 0x0200
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#define IN_EA_LOCKWAIT 0x0400
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#define i_devvp i_ump->um_devvp
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#define i_umbufobj i_ump->um_bo
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#define i_dirhash i_un.dirhash
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#define i_snapblklist i_un.snapblklist
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#define i_din1 dinode_u.din1
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#define i_din2 dinode_u.din2
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#ifdef _KERNEL
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/*
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* The DIP macro is used to access fields in the dinode that are
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* not cached in the inode itself.
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*/
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#define DIP(ip, field) \
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(((ip)->i_ump->um_fstype == UFS1) ? \
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(ip)->i_din1->d##field : (ip)->i_din2->d##field)
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#define DIP_SET(ip, field, val) do { \
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if ((ip)->i_ump->um_fstype == UFS1) \
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(ip)->i_din1->d##field = (val); \
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else \
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(ip)->i_din2->d##field = (val); \
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} while (0)
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#define MAXSYMLINKLEN(ip) \
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((ip)->i_ump->um_fstype == UFS1) ? \
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((NDADDR + NIADDR) * sizeof(ufs1_daddr_t)) : \
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((NDADDR + NIADDR) * sizeof(ufs2_daddr_t))
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#define SHORTLINK(ip) \
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(((ip)->i_ump->um_fstype == UFS1) ? \
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(caddr_t)(ip)->i_din1->di_db : (caddr_t)(ip)->i_din2->di_db)
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/*
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* Structure used to pass around logical block paths generated by
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* ufs_getlbns and used by truncate and bmap code.
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*/
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struct indir {
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ufs2_daddr_t in_lbn; /* Logical block number. */
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int in_off; /* Offset in buffer. */
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int in_exists; /* Flag if the block exists. */
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};
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/* Convert between inode pointers and vnode pointers. */
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#define VTOI(vp) ((struct inode *)(vp)->v_data)
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#define ITOV(ip) ((ip)->i_vnode)
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/* Determine if soft dependencies are being done */
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#define DOINGSOFTDEP(vp) ((vp)->v_mount->mnt_flag & MNT_SOFTDEP)
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#define DOINGASYNC(vp) ((vp)->v_mount->mnt_kern_flag & MNTK_ASYNC)
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/* This overlays the fid structure (see mount.h). */
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struct ufid {
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u_int16_t ufid_len; /* Length of structure. */
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u_int16_t ufid_pad; /* Force 32-bit alignment. */
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ino_t ufid_ino; /* File number (ino). */
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int32_t ufid_gen; /* Generation number. */
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};
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#endif /* _KERNEL */
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#endif /* !_UFS_UFS_INODE_H_ */
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