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mirror_zfs/include/sys/vnode.h
Li Wei 4be55565fe Fix stack overflow in vn_rdwr() due to memory reclaim 
Unless __GFP_IO and __GFP_FS are removed from the file mapping gfp
mask we may enter memory reclaim during IO.  In this case shrink_slab()
entered another file system which is notoriously hungry for stack.
This additional stack usage may cause a stack overflow.  This patch
removes __GFP_IO and __GFP_FS from the mapping gfp mask of each file
during vn_open() to avoid any reclaim in the vn_rdwr() IO path.  The
original mask is then restored at vn_close() time.  Hats off to the
loop driver which does something similiar for the same reason.

  [...]
  shrink_slab+0xdc/0x153
  try_to_free_pages+0x1da/0x2d7
  __alloc_pages+0x1d7/0x2da
  do_generic_mapping_read+0x2c9/0x36f
  file_read_actor+0x0/0x145
  __generic_file_aio_read+0x14f/0x19b
  generic_file_aio_read+0x34/0x39
  do_sync_read+0xc7/0x104
  vfs_read+0xcb/0x171
  :spl:vn_rdwr+0x2b8/0x402
  :zfs:vdev_file_io_start+0xad/0xe1
  [...]

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2010-08-12 09:34:33 -07:00

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/*****************************************************************************\
* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
* Copyright (C) 2007 The Regents of the University of California.
* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
* UCRL-CODE-235197
*
* This file is part of the SPL, Solaris Porting Layer.
* For details, see <http://github.com/behlendorf/spl/>.
*
* The SPL is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* The SPL is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with the SPL. If not, see <http://www.gnu.org/licenses/>.
\*****************************************************************************/
#ifndef _SPL_VNODE_H
#define _SPL_VNODE_H
#include <linux/module.h>
#include <linux/syscalls.h>
#include <linux/fcntl.h>
#include <linux/buffer_head.h>
#include <linux/dcache.h>
#include <linux/namei.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/fs_struct.h>
#include <linux/mount.h>
#include <sys/kmem.h>
#include <sys/mutex.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/sunldi.h>
#define XVA_MAPSIZE 3
#define XVA_MAGIC 0x78766174
/*
* Prior to linux-2.6.33 only O_DSYNC semantics were implemented and
* they used the O_SYNC flag. As of linux-2.6.33 the this behavior
* was properly split in to O_SYNC and O_DSYNC respectively.
*/
#ifndef O_DSYNC
#define O_DSYNC O_SYNC
#endif
#define FREAD 1
#define FWRITE 2
#define FCREAT O_CREAT
#define FTRUNC O_TRUNC
#define FOFFMAX O_LARGEFILE
#define FSYNC O_SYNC
#define FDSYNC O_DSYNC
#define FRSYNC O_RSYNC
#define FEXCL O_EXCL
#define FDIRECT O_DIRECT
#define FAPPEND O_APPEND
#define FNODSYNC 0x10000 /* fsync pseudo flag */
#define FNOFOLLOW 0x20000 /* don't follow symlinks */
#define AT_TYPE 0x00001
#define AT_MODE 0x00002
#undef AT_UID /* Conflicts with linux/auxvec.h */
#define AT_UID 0x00004
#undef AT_GID /* Conflicts with linux/auxvec.h */
#define AT_GID 0x00008
#define AT_FSID 0x00010
#define AT_NODEID 0x00020
#define AT_NLINK 0x00040
#define AT_SIZE 0x00080
#define AT_ATIME 0x00100
#define AT_MTIME 0x00200
#define AT_CTIME 0x00400
#define AT_RDEV 0x00800
#define AT_BLKSIZE 0x01000
#define AT_NBLOCKS 0x02000
#define AT_SEQ 0x08000
#define AT_XVATTR 0x10000
#define CRCREAT 0x01
#define RMFILE 0x02
#define B_INVAL 0x01
#define B_TRUNC 0x02
#ifdef HAVE_PATH_IN_NAMEIDATA
# define nd_dentry path.dentry
# define nd_mnt path.mnt
#else
# define nd_dentry dentry
# define nd_mnt mnt
#endif
typedef enum vtype {
VNON = 0,
VREG = 1,
VDIR = 2,
VBLK = 3,
VCHR = 4,
VLNK = 5,
VFIFO = 6,
VDOOR = 7,
VPROC = 8,
VSOCK = 9,
VPORT = 10,
VBAD = 11
} vtype_t;
typedef struct vattr {
enum vtype va_type; /* vnode type */
u_int va_mask; /* attribute bit-mask */
u_short va_mode; /* acc mode */
short va_uid; /* owner uid */
short va_gid; /* owner gid */
long va_fsid; /* fs id */
long va_nodeid; /* node # */
short va_nlink; /* # links */
u_long va_size; /* file size */
long va_blocksize; /* block size */
struct timeval va_atime; /* last acc */
struct timeval va_mtime; /* last mod */
struct timeval va_ctime; /* last chg */
dev_t va_rdev; /* dev */
long va_blocks; /* space used */
} vattr_t;
typedef struct xoptattr {
timestruc_t xoa_createtime; /* Create time of file */
uint8_t xoa_archive;
uint8_t xoa_system;
uint8_t xoa_readonly;
uint8_t xoa_hidden;
uint8_t xoa_nounlink;
uint8_t xoa_immutable;
uint8_t xoa_appendonly;
uint8_t xoa_nodump;
uint8_t xoa_settable;
uint8_t xoa_opaque;
uint8_t xoa_av_quarantined;
uint8_t xoa_av_modified;
} xoptattr_t;
typedef struct xvattr {
vattr_t xva_vattr; /* Embedded vattr structure */
uint32_t xva_magic; /* Magic Number */
uint32_t xva_mapsize; /* Size of attr bitmap (32-bit words) */
uint32_t *xva_rtnattrmapp; /* Ptr to xva_rtnattrmap[] */
uint32_t xva_reqattrmap[XVA_MAPSIZE]; /* Requested attrs */
uint32_t xva_rtnattrmap[XVA_MAPSIZE]; /* Returned attrs */
xoptattr_t xva_xoptattrs; /* Optional attributes */
} xvattr_t;
typedef struct vsecattr {
uint_t vsa_mask; /* See below */
int vsa_aclcnt; /* ACL entry count */
void *vsa_aclentp; /* pointer to ACL entries */
int vsa_dfaclcnt; /* default ACL entry count */
void *vsa_dfaclentp; /* pointer to default ACL entries */
size_t vsa_aclentsz; /* ACE size in bytes of vsa_aclentp */
} vsecattr_t;
typedef struct vnode {
struct file *v_file;
kmutex_t v_lock; /* protects vnode fields */
uint_t v_flag; /* vnode flags (see below) */
uint_t v_count; /* reference count */
void *v_data; /* private data for fs */
struct vfs *v_vfsp; /* ptr to containing VFS */
struct stdata *v_stream; /* associated stream */
enum vtype v_type; /* vnode type */
dev_t v_rdev; /* device (VCHR, VBLK) */
gfp_t v_gfp_mask; /* original mapping gfp mask */
} vnode_t;
typedef struct vn_file {
int f_fd; /* linux fd for lookup */
struct file *f_file; /* linux file struct */
atomic_t f_ref; /* ref count */
kmutex_t f_lock; /* struct lock */
loff_t f_offset; /* offset */
vnode_t *f_vnode; /* vnode */
struct list_head f_list; /* list referenced file_t's */
} file_t;
typedef struct caller_context {
pid_t cc_pid; /* Process ID of the caller */
int cc_sysid; /* System ID, used for remote calls */
u_longlong_t cc_caller_id; /* Identifier for (set of) caller(s) */
ulong_t cc_flags;
} caller_context_t;
extern vnode_t *vn_alloc(int flag);
void vn_free(vnode_t *vp);
extern int vn_open(const char *path, uio_seg_t seg, int flags, int mode,
vnode_t **vpp, int x1, void *x2);
extern int vn_openat(const char *path, uio_seg_t seg, int flags, int mode,
vnode_t **vpp, int x1, void *x2, vnode_t *vp, int fd);
extern int vn_rdwr(uio_rw_t uio, vnode_t *vp, void *addr, ssize_t len,
offset_t off, uio_seg_t seg, int x1, rlim64_t x2,
void *x3, ssize_t *residp);
extern int vn_close(vnode_t *vp, int flags, int x1, int x2, void *x3, void *x4);
extern int vn_seek(vnode_t *vp, offset_t o, offset_t *op, caller_context_t *ct);
extern int vn_remove(const char *path, uio_seg_t seg, int flags);
extern int vn_rename(const char *path1, const char *path2, int x1);
extern int vn_getattr(vnode_t *vp, vattr_t *vap, int flags, void *x3, void *x4);
extern int vn_fsync(vnode_t *vp, int flags, void *x3, void *x4);
extern file_t *vn_getf(int fd);
extern void vn_releasef(int fd);
extern int vn_set_pwd(const char *filename);
int vn_init(void);
void vn_fini(void);
static __inline__ int
vn_rele(vnode_t *vp)
{
return 0;
} /* vn_rele() */
static __inline__ int
vn_putpage(vnode_t *vp, offset_t off, ssize_t size,
int flags, void *x1, void *x2) {
return 0;
} /* vn_putpage() */
#define VOP_CLOSE vn_close
#define VOP_SEEK vn_seek
#define VN_RELE vn_rele
#define VOP_GETATTR vn_getattr
#define VOP_FSYNC vn_fsync
#define VOP_PUTPAGE vn_putpage
#define vn_is_readonly(vp) 0
#define getf vn_getf
#define releasef vn_releasef
extern vnode_t *rootdir;
#endif /* SPL_VNODE_H */
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