426da3bcfb
Seigo Tanimura (tanimura) posted the initial delta.
I've polished it quite a bit reducing the need for locking and
adapting it for KSE.
Locks:
1 mutex in each filedesc
protects all the fields.
protects "struct file" initialization, while a struct file
is being changed from &badfileops -> &pipeops or something
the filedesc should be locked.
1 mutex in each struct file
protects the refcount fields.
doesn't protect anything else.
the flags used for garbage collection have been moved to
f_gcflag which was the FILLER short, this doesn't need
locking because the garbage collection is a single threaded
container.
could likely be made to use a pool mutex.
1 sx lock for the global filelist.
struct file * fhold(struct file *fp);
/* increments reference count on a file */
struct file * fhold_locked(struct file *fp);
/* like fhold but expects file to locked */
struct file * ffind_hold(struct thread *, int fd);
/* finds the struct file in thread, adds one reference and
returns it unlocked */
struct file * ffind_lock(struct thread *, int fd);
/* ffind_hold, but returns file locked */
I still have to smp-safe the fget cruft, I'll get to that asap.
481 lines
12 KiB
C
481 lines
12 KiB
C
/*-
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* Copyright (c) 1994-1995 Søren Schmidt
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* All rights reserved.
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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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* in this position and unchanged.
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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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software withough specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/dirent.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/proc.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/vnode.h>
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#include <machine/../linux/linux.h>
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#include <machine/../linux/linux_proto.h>
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#include <compat/linux/linux_util.h>
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static int
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newstat_copyout(struct stat *buf, void *ubuf)
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{
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struct l_newstat tbuf;
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struct cdevsw *cdevsw;
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dev_t dev;
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tbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8);
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tbuf.st_ino = buf->st_ino;
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tbuf.st_mode = buf->st_mode;
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tbuf.st_nlink = buf->st_nlink;
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tbuf.st_uid = buf->st_uid;
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tbuf.st_gid = buf->st_gid;
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tbuf.st_rdev = buf->st_rdev;
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tbuf.st_size = buf->st_size;
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tbuf.st_atime = buf->st_atime;
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tbuf.st_mtime = buf->st_mtime;
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tbuf.st_ctime = buf->st_ctime;
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tbuf.st_blksize = buf->st_blksize;
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tbuf.st_blocks = buf->st_blocks;
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/* Lie about disk drives which are character devices
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* in FreeBSD but block devices under Linux.
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*/
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if (S_ISCHR(tbuf.st_mode) &&
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(dev = udev2dev(buf->st_rdev, 0)) != NODEV) {
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cdevsw = devsw(dev);
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if (cdevsw != NULL && (cdevsw->d_flags & D_DISK)) {
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tbuf.st_mode &= ~S_IFMT;
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tbuf.st_mode |= S_IFBLK;
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/* XXX this may not be quite right */
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/* Map major number to 0 */
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tbuf.st_dev = uminor(buf->st_dev) & 0xf;
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tbuf.st_rdev = buf->st_rdev & 0xff;
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}
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}
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return (copyout(&tbuf, ubuf, sizeof(tbuf)));
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}
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int
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linux_newstat(struct thread *td, struct linux_newstat_args *args)
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{
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struct stat buf;
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struct nameidata nd;
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int error;
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caddr_t sg;
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sg = stackgap_init();
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CHECKALTEXIST(td, &sg, args->path);
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#ifdef DEBUG
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if (ldebug(newstat))
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printf(ARGS(newstat, "%s, *"), args->path);
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#endif
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NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
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args->path, td);
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error = namei(&nd);
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if (error)
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return (error);
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NDFREE(&nd, NDF_ONLY_PNBUF);
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error = vn_stat(nd.ni_vp, &buf, td);
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vput(nd.ni_vp);
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if (error)
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return (error);
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return (newstat_copyout(&buf, args->buf));
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}
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int
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linux_newlstat(struct thread *td, struct linux_newlstat_args *args)
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{
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int error;
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struct stat sb;
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struct nameidata nd;
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caddr_t sg;
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sg = stackgap_init();
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CHECKALTEXIST(td, &sg, args->path);
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#ifdef DEBUG
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if (ldebug(newlstat))
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printf(ARGS(newlstat, "%s, *"), args->path);
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#endif
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NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
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args->path, td);
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error = namei(&nd);
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if (error)
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return (error);
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NDFREE(&nd, NDF_ONLY_PNBUF);
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error = vn_stat(nd.ni_vp, &sb, td);
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vput(nd.ni_vp);
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if (error)
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return (error);
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return (newstat_copyout(&sb, args->buf));
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}
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int
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linux_newfstat(struct thread *td, struct linux_newfstat_args *args)
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{
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struct file *fp;
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struct stat buf;
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int error;
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#ifdef DEBUG
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if (ldebug(newfstat))
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printf(ARGS(newfstat, "%d, *"), args->fd);
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#endif
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fp = ffind_hold(td, args->fd);
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if (fp == NULL)
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return (EBADF);
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error = fo_stat(fp, &buf, td);
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fdrop(fp, td);
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if (!error)
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error = newstat_copyout(&buf, args->buf);
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return (error);
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}
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/* XXX - All fields of type l_int are defined as l_long on i386 */
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struct l_statfs {
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l_int f_type;
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l_int f_bsize;
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l_int f_blocks;
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l_int f_bfree;
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l_int f_bavail;
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l_int f_files;
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l_int f_ffree;
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l_fsid_t f_fsid;
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l_int f_namelen;
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l_int f_spare[6];
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};
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#define LINUX_CODA_SUPER_MAGIC 0x73757245L
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#define LINUX_EXT2_SUPER_MAGIC 0xEF53L
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#define LINUX_HPFS_SUPER_MAGIC 0xf995e849L
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#define LINUX_ISOFS_SUPER_MAGIC 0x9660L
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#define LINUX_MSDOS_SUPER_MAGIC 0x4d44L
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#define LINUX_NCP_SUPER_MAGIC 0x564cL
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#define LINUX_NFS_SUPER_MAGIC 0x6969L
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#define LINUX_NTFS_SUPER_MAGIC 0x5346544EL
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#define LINUX_PROC_SUPER_MAGIC 0x9fa0L
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#define LINUX_UFS_SUPER_MAGIC 0x00011954L /* XXX - UFS_MAGIC in Linux */
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static long
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bsd_to_linux_ftype(const char *fstypename)
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{
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int i;
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static struct {const char *bsd_name; long linux_type;} b2l_tbl[] = {
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{"ufs", LINUX_UFS_SUPER_MAGIC},
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{"cd9660", LINUX_ISOFS_SUPER_MAGIC},
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{"nfs", LINUX_NFS_SUPER_MAGIC},
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{"ext2fs", LINUX_EXT2_SUPER_MAGIC},
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{"procfs", LINUX_PROC_SUPER_MAGIC},
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{"msdosfs", LINUX_MSDOS_SUPER_MAGIC},
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{"ntfs", LINUX_NTFS_SUPER_MAGIC},
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{"nwfs", LINUX_NCP_SUPER_MAGIC},
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{"hpfs", LINUX_HPFS_SUPER_MAGIC},
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{"coda", LINUX_CODA_SUPER_MAGIC},
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{NULL, 0L}};
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for (i = 0; b2l_tbl[i].bsd_name != NULL; i++)
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if (strcmp(b2l_tbl[i].bsd_name, fstypename) == 0)
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return (b2l_tbl[i].linux_type);
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return (0L);
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}
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int
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linux_statfs(struct thread *td, struct linux_statfs_args *args)
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{
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struct mount *mp;
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struct nameidata *ndp;
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struct statfs *bsd_statfs;
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struct nameidata nd;
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struct l_statfs linux_statfs;
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int error;
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caddr_t sg;
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sg = stackgap_init();
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CHECKALTEXIST(td, &sg, args->path);
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#ifdef DEBUG
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if (ldebug(statfs))
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printf(ARGS(statfs, "%s, *"), args->path);
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#endif
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ndp = &nd;
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NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args->path, curthread);
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error = namei(ndp);
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if (error)
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return error;
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NDFREE(ndp, NDF_ONLY_PNBUF);
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mp = ndp->ni_vp->v_mount;
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bsd_statfs = &mp->mnt_stat;
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vrele(ndp->ni_vp);
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error = VFS_STATFS(mp, bsd_statfs, td);
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if (error)
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return error;
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bsd_statfs->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
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linux_statfs.f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename);
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linux_statfs.f_bsize = bsd_statfs->f_bsize;
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linux_statfs.f_blocks = bsd_statfs->f_blocks;
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linux_statfs.f_bfree = bsd_statfs->f_bfree;
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linux_statfs.f_bavail = bsd_statfs->f_bavail;
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linux_statfs.f_ffree = bsd_statfs->f_ffree;
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linux_statfs.f_files = bsd_statfs->f_files;
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linux_statfs.f_fsid.val[0] = bsd_statfs->f_fsid.val[0];
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linux_statfs.f_fsid.val[1] = bsd_statfs->f_fsid.val[1];
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linux_statfs.f_namelen = MAXNAMLEN;
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return copyout((caddr_t)&linux_statfs, (caddr_t)args->buf,
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sizeof(linux_statfs));
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}
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int
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linux_fstatfs(struct thread *td, struct linux_fstatfs_args *args)
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{
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struct file *fp;
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struct mount *mp;
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struct statfs *bsd_statfs;
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struct l_statfs linux_statfs;
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int error;
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#ifdef DEBUG
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if (ldebug(fstatfs))
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printf(ARGS(fstatfs, "%d, *"), args->fd);
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#endif
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error = getvnode(td->td_proc->p_fd, args->fd, &fp);
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if (error)
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return error;
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mp = ((struct vnode *)fp->f_data)->v_mount;
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bsd_statfs = &mp->mnt_stat;
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error = VFS_STATFS(mp, bsd_statfs, td);
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if (error) {
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fdrop(fp, td);
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return error;
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}
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bsd_statfs->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
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linux_statfs.f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename);
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linux_statfs.f_bsize = bsd_statfs->f_bsize;
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linux_statfs.f_blocks = bsd_statfs->f_blocks;
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linux_statfs.f_bfree = bsd_statfs->f_bfree;
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linux_statfs.f_bavail = bsd_statfs->f_bavail;
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linux_statfs.f_ffree = bsd_statfs->f_ffree;
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linux_statfs.f_files = bsd_statfs->f_files;
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linux_statfs.f_fsid.val[0] = bsd_statfs->f_fsid.val[0];
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linux_statfs.f_fsid.val[1] = bsd_statfs->f_fsid.val[1];
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linux_statfs.f_namelen = MAXNAMLEN;
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error = copyout((caddr_t)&linux_statfs, (caddr_t)args->buf,
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sizeof(linux_statfs));
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fdrop(fp, td);
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return error;
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}
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struct l_ustat
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{
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l_daddr_t f_tfree;
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l_ino_t f_tinode;
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char f_fname[6];
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char f_fpack[6];
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};
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int
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linux_ustat(struct thread *td, struct linux_ustat_args *args)
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{
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struct l_ustat lu;
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dev_t dev;
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struct vnode *vp;
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struct statfs *stat;
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int error;
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#ifdef DEBUG
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if (ldebug(ustat))
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printf(ARGS(ustat, "%d, *"), args->dev);
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#endif
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/*
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* lu.f_fname and lu.f_fpack are not used. They are always zeroed.
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* lu.f_tinode and lu.f_tfree are set from the device's super block.
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*/
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bzero(&lu, sizeof(lu));
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/*
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* XXX - Don't return an error if we can't find a vnode for the
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* device. Our dev_t is 32-bits whereas Linux only has a 16-bits
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* dev_t. The dev_t that is used now may as well be a truncated
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* dev_t returned from previous syscalls. Just return a bzeroed
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* ustat in that case.
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*/
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dev = makedev(args->dev >> 8, args->dev & 0xFF);
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if (vfinddev(dev, VCHR, &vp)) {
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if (vp->v_mount == NULL)
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return (EINVAL);
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stat = &(vp->v_mount->mnt_stat);
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error = VFS_STATFS(vp->v_mount, stat, td);
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if (error)
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return (error);
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lu.f_tfree = stat->f_bfree;
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lu.f_tinode = stat->f_ffree;
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}
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return (copyout(&lu, args->ubuf, sizeof(lu)));
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}
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#if defined(__i386__)
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static int
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stat64_copyout(struct stat *buf, void *ubuf)
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{
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struct l_stat64 lbuf;
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bzero(&lbuf, sizeof(lbuf));
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lbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8);
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lbuf.st_ino = buf->st_ino;
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lbuf.st_mode = buf->st_mode;
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lbuf.st_nlink = buf->st_nlink;
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lbuf.st_uid = buf->st_uid;
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lbuf.st_gid = buf->st_gid;
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lbuf.st_rdev = buf->st_rdev;
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lbuf.st_size = buf->st_size;
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lbuf.st_atime = buf->st_atime;
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lbuf.st_mtime = buf->st_mtime;
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lbuf.st_ctime = buf->st_ctime;
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lbuf.st_blksize = buf->st_blksize;
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lbuf.st_blocks = buf->st_blocks;
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/*
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* The __st_ino field makes all the difference. In the Linux kernel
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* it is conditionally compiled based on STAT64_HAS_BROKEN_ST_INO,
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* but without the assignment to __st_ino the runtime linker refuses
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* to mmap(2) any shared libraries. I guess it's broken alright :-)
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*/
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lbuf.__st_ino = buf->st_ino;
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return (copyout(&lbuf, ubuf, sizeof(lbuf)));
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}
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int
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linux_stat64(struct thread *td, struct linux_stat64_args *args)
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{
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struct stat buf;
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struct nameidata nd;
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int error;
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caddr_t sg;
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sg = stackgap_init();
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CHECKALTEXIST(td, &sg, args->filename);
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#ifdef DEBUG
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if (ldebug(stat64))
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printf(ARGS(stat64, "%s, *"), args->filename);
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#endif
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NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
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args->filename, td);
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error = namei(&nd);
|
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if (error)
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return (error);
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NDFREE(&nd, NDF_ONLY_PNBUF);
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error = vn_stat(nd.ni_vp, &buf, td);
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vput(nd.ni_vp);
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if (error)
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return (error);
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return (stat64_copyout(&buf, args->statbuf));
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}
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|
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int
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linux_lstat64(struct thread *td, struct linux_lstat64_args *args)
|
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{
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int error;
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struct stat sb;
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struct nameidata nd;
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caddr_t sg;
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sg = stackgap_init();
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CHECKALTEXIST(td, &sg, args->filename);
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|
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#ifdef DEBUG
|
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if (ldebug(lstat64))
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printf(ARGS(lstat64, "%s, *"), args->filename);
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#endif
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NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE,
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args->filename, td);
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error = namei(&nd);
|
|
if (error)
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return (error);
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NDFREE(&nd, NDF_ONLY_PNBUF);
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error = vn_stat(nd.ni_vp, &sb, td);
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vput(nd.ni_vp);
|
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if (error)
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return (error);
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return (stat64_copyout(&sb, args->statbuf));
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}
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|
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int
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linux_fstat64(struct thread *td, struct linux_fstat64_args *args)
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{
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struct filedesc *fdp;
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struct file *fp;
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struct stat buf;
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int error;
|
|
|
|
#ifdef DEBUG
|
|
if (ldebug(fstat64))
|
|
printf(ARGS(fstat64, "%d, *"), args->fd);
|
|
#endif
|
|
|
|
fdp = td->td_proc->p_fd;
|
|
if ((unsigned)args->fd >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[args->fd]) == NULL)
|
|
return (EBADF);
|
|
|
|
error = fo_stat(fp, &buf, td);
|
|
if (!error)
|
|
error = stat64_copyout(&buf, args->statbuf);
|
|
|
|
return (error);
|
|
}
|
|
|
|
#endif /* __i386__ */
|