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4be55565fe
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>
251 lines
7.4 KiB
C
251 lines
7.4 KiB
C
/*****************************************************************************\
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* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2007 The Regents of the University of California.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
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* UCRL-CODE-235197
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*
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* This file is part of the SPL, Solaris Porting Layer.
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* For details, see <http://github.com/behlendorf/spl/>.
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*
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* The SPL is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The SPL is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the SPL. If not, see <http://www.gnu.org/licenses/>.
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\*****************************************************************************/
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#ifndef _SPL_VNODE_H
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#define _SPL_VNODE_H
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#include <linux/module.h>
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#include <linux/syscalls.h>
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#include <linux/fcntl.h>
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#include <linux/buffer_head.h>
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#include <linux/dcache.h>
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#include <linux/namei.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/fs_struct.h>
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#include <linux/mount.h>
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#include <sys/kmem.h>
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#include <sys/mutex.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/uio.h>
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#include <sys/sunldi.h>
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#define XVA_MAPSIZE 3
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#define XVA_MAGIC 0x78766174
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/*
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* Prior to linux-2.6.33 only O_DSYNC semantics were implemented and
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* they used the O_SYNC flag. As of linux-2.6.33 the this behavior
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* was properly split in to O_SYNC and O_DSYNC respectively.
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*/
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#ifndef O_DSYNC
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#define O_DSYNC O_SYNC
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#endif
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#define FREAD 1
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#define FWRITE 2
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#define FCREAT O_CREAT
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#define FTRUNC O_TRUNC
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#define FOFFMAX O_LARGEFILE
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#define FSYNC O_SYNC
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#define FDSYNC O_DSYNC
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#define FRSYNC O_RSYNC
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#define FEXCL O_EXCL
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#define FDIRECT O_DIRECT
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#define FAPPEND O_APPEND
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#define FNODSYNC 0x10000 /* fsync pseudo flag */
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#define FNOFOLLOW 0x20000 /* don't follow symlinks */
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#define AT_TYPE 0x00001
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#define AT_MODE 0x00002
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#undef AT_UID /* Conflicts with linux/auxvec.h */
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#define AT_UID 0x00004
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#undef AT_GID /* Conflicts with linux/auxvec.h */
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#define AT_GID 0x00008
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#define AT_FSID 0x00010
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#define AT_NODEID 0x00020
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#define AT_NLINK 0x00040
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#define AT_SIZE 0x00080
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#define AT_ATIME 0x00100
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#define AT_MTIME 0x00200
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#define AT_CTIME 0x00400
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#define AT_RDEV 0x00800
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#define AT_BLKSIZE 0x01000
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#define AT_NBLOCKS 0x02000
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#define AT_SEQ 0x08000
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#define AT_XVATTR 0x10000
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#define CRCREAT 0x01
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#define RMFILE 0x02
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#define B_INVAL 0x01
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#define B_TRUNC 0x02
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#ifdef HAVE_PATH_IN_NAMEIDATA
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# define nd_dentry path.dentry
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# define nd_mnt path.mnt
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#else
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# define nd_dentry dentry
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# define nd_mnt mnt
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#endif
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typedef enum vtype {
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VNON = 0,
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VREG = 1,
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VDIR = 2,
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VBLK = 3,
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VCHR = 4,
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VLNK = 5,
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VFIFO = 6,
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VDOOR = 7,
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VPROC = 8,
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VSOCK = 9,
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VPORT = 10,
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VBAD = 11
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} vtype_t;
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typedef struct vattr {
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enum vtype va_type; /* vnode type */
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u_int va_mask; /* attribute bit-mask */
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u_short va_mode; /* acc mode */
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short va_uid; /* owner uid */
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short va_gid; /* owner gid */
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long va_fsid; /* fs id */
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long va_nodeid; /* node # */
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short va_nlink; /* # links */
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u_long va_size; /* file size */
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long va_blocksize; /* block size */
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struct timeval va_atime; /* last acc */
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struct timeval va_mtime; /* last mod */
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struct timeval va_ctime; /* last chg */
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dev_t va_rdev; /* dev */
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long va_blocks; /* space used */
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} vattr_t;
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typedef struct xoptattr {
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timestruc_t xoa_createtime; /* Create time of file */
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uint8_t xoa_archive;
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uint8_t xoa_system;
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uint8_t xoa_readonly;
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uint8_t xoa_hidden;
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uint8_t xoa_nounlink;
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uint8_t xoa_immutable;
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uint8_t xoa_appendonly;
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uint8_t xoa_nodump;
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uint8_t xoa_settable;
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uint8_t xoa_opaque;
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uint8_t xoa_av_quarantined;
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uint8_t xoa_av_modified;
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} xoptattr_t;
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typedef struct xvattr {
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vattr_t xva_vattr; /* Embedded vattr structure */
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uint32_t xva_magic; /* Magic Number */
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uint32_t xva_mapsize; /* Size of attr bitmap (32-bit words) */
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uint32_t *xva_rtnattrmapp; /* Ptr to xva_rtnattrmap[] */
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uint32_t xva_reqattrmap[XVA_MAPSIZE]; /* Requested attrs */
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uint32_t xva_rtnattrmap[XVA_MAPSIZE]; /* Returned attrs */
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xoptattr_t xva_xoptattrs; /* Optional attributes */
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} xvattr_t;
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typedef struct vsecattr {
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uint_t vsa_mask; /* See below */
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int vsa_aclcnt; /* ACL entry count */
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void *vsa_aclentp; /* pointer to ACL entries */
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int vsa_dfaclcnt; /* default ACL entry count */
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void *vsa_dfaclentp; /* pointer to default ACL entries */
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size_t vsa_aclentsz; /* ACE size in bytes of vsa_aclentp */
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} vsecattr_t;
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typedef struct vnode {
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struct file *v_file;
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kmutex_t v_lock; /* protects vnode fields */
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uint_t v_flag; /* vnode flags (see below) */
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uint_t v_count; /* reference count */
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void *v_data; /* private data for fs */
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struct vfs *v_vfsp; /* ptr to containing VFS */
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struct stdata *v_stream; /* associated stream */
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enum vtype v_type; /* vnode type */
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dev_t v_rdev; /* device (VCHR, VBLK) */
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gfp_t v_gfp_mask; /* original mapping gfp mask */
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} vnode_t;
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typedef struct vn_file {
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int f_fd; /* linux fd for lookup */
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struct file *f_file; /* linux file struct */
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atomic_t f_ref; /* ref count */
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kmutex_t f_lock; /* struct lock */
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loff_t f_offset; /* offset */
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vnode_t *f_vnode; /* vnode */
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struct list_head f_list; /* list referenced file_t's */
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} file_t;
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typedef struct caller_context {
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pid_t cc_pid; /* Process ID of the caller */
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int cc_sysid; /* System ID, used for remote calls */
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u_longlong_t cc_caller_id; /* Identifier for (set of) caller(s) */
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ulong_t cc_flags;
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} caller_context_t;
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extern vnode_t *vn_alloc(int flag);
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void vn_free(vnode_t *vp);
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extern int vn_open(const char *path, uio_seg_t seg, int flags, int mode,
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vnode_t **vpp, int x1, void *x2);
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extern int vn_openat(const char *path, uio_seg_t seg, int flags, int mode,
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vnode_t **vpp, int x1, void *x2, vnode_t *vp, int fd);
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extern int vn_rdwr(uio_rw_t uio, vnode_t *vp, void *addr, ssize_t len,
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offset_t off, uio_seg_t seg, int x1, rlim64_t x2,
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void *x3, ssize_t *residp);
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extern int vn_close(vnode_t *vp, int flags, int x1, int x2, void *x3, void *x4);
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extern int vn_seek(vnode_t *vp, offset_t o, offset_t *op, caller_context_t *ct);
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extern int vn_remove(const char *path, uio_seg_t seg, int flags);
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extern int vn_rename(const char *path1, const char *path2, int x1);
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extern int vn_getattr(vnode_t *vp, vattr_t *vap, int flags, void *x3, void *x4);
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extern int vn_fsync(vnode_t *vp, int flags, void *x3, void *x4);
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extern file_t *vn_getf(int fd);
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extern void vn_releasef(int fd);
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extern int vn_set_pwd(const char *filename);
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int vn_init(void);
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void vn_fini(void);
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static __inline__ int
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vn_rele(vnode_t *vp)
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{
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return 0;
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} /* vn_rele() */
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static __inline__ int
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vn_putpage(vnode_t *vp, offset_t off, ssize_t size,
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int flags, void *x1, void *x2) {
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return 0;
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} /* vn_putpage() */
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#define VOP_CLOSE vn_close
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#define VOP_SEEK vn_seek
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#define VN_RELE vn_rele
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#define VOP_GETATTR vn_getattr
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#define VOP_FSYNC vn_fsync
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#define VOP_PUTPAGE vn_putpage
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#define vn_is_readonly(vp) 0
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#define getf vn_getf
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#define releasef vn_releasef
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extern vnode_t *rootdir;
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#endif /* SPL_VNODE_H */
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