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freebsd-dev/sys/fs/fdescfs/fdesc.h

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/* -> /*- for copyright notices, minor format tweaks as necessary
2005-01-06 18:10:42 +00:00
/*-
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software donated to Berkeley by
* Jan-Simon Pendry.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)fdesc.h 8.5 (Berkeley) 1/21/94
*
$Id$ -> $FreeBSD$
1999-08-28 01:08:13 +00:00
* $FreeBSD$
BSD 4.4 Lite Kernel Sources
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*/
Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL" is an application space macro and the applications are supposed to be free to use it as they please (but cannot). This is consistant with the other BSD's who made this change quite some time ago. More commits to come.
1999-12-29 05:07:58 +00:00
#ifdef _KERNEL
- Add locking to all filesystem operations in fdescfs and flag it as MPSAFE. - Use proper synhronization primitives to protect the internal fdesc node cache used in fdescfs. - Properly initialize and uninitalize hash. - Remove unused functions. Since fdescfs might recurse on itself, adding proper locking to it needed some tricky workarounds in some parts to make it work. For instance, a descriptor in fdescfs could refer to an open descriptor to itself, thus forcing the thread to recurse on vnode locks. Because of this, other race conditions also had to be fixed. Tested by: pho Reviewed by: kib (mentor) Approved by: kib (mentor)
2008-05-24 14:51:30 +00:00
/* Private mount flags for fdescfs. */
#define FMNT_UNMOUNTF 0x01
BSD 4.4 Lite Kernel Sources
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struct fdescmount {
struct vnode *f_root; /* Root node */
- Add locking to all filesystem operations in fdescfs and flag it as MPSAFE. - Use proper synhronization primitives to protect the internal fdesc node cache used in fdescfs. - Properly initialize and uninitalize hash. - Remove unused functions. Since fdescfs might recurse on itself, adding proper locking to it needed some tricky workarounds in some parts to make it work. For instance, a descriptor in fdescfs could refer to an open descriptor to itself, thus forcing the thread to recurse on vnode locks. Because of this, other race conditions also had to be fixed. Tested by: pho Reviewed by: kib (mentor) Approved by: kib (mentor)
2008-05-24 14:51:30 +00:00
int flags;
BSD 4.4 Lite Kernel Sources
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};
Adapt fdesc to be mounted on /dev/fd and remove fd, stdin, stdout and stderr nodes. More specific items of this patch: o Removed support for symbolic links, and the need for fdesc_readlink(). o Put all the code from fdesc_attr() into fdesc_getattr() and removed fdesc_attr(). This also made it easier to properly give all nodes unique inode numbers. o The removal of all non-fd nodes allowed the removal of the fdesc_read(), fdesc_write(), and fdesc_ioctl() nodes, since we no longer have nodes that get special handling. o Correct the component name validity-checking in fdesc_lookup(). It previously detected the end of the string by checking for a terminating NUL, now it uses cnp->cn_namelen. o Handle kqueue files as FIFOs. This is probably the closest file type to represent this type of file there is, and it is unfortunately not very representative of a kqueue. Creation time is not supported by kqueue, so ctime, mtime and atime are all set to the current time when getattr() was called. o Also set st_[mca]time to the current time since there's no data in socket structures that can be used to fill this in (FIFOs). o Simplify fdesc_readdir() since it only has to report the numbered fd nodes. Add `.' and `..' directory links as well. o Remove read bits from directories as they tend to confuse programs like tar(1). Reviewed by: phk Discussed with: bde (earlier on, not quite review)
2000-05-11 22:10:51 +00:00
#define FD_ROOT 1
#define FD_DESC 3
BSD 4.4 Lite Kernel Sources
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typedef enum {
Froot,
Adapt fdesc to be mounted on /dev/fd and remove fd, stdin, stdout and stderr nodes. More specific items of this patch: o Removed support for symbolic links, and the need for fdesc_readlink(). o Put all the code from fdesc_attr() into fdesc_getattr() and removed fdesc_attr(). This also made it easier to properly give all nodes unique inode numbers. o The removal of all non-fd nodes allowed the removal of the fdesc_read(), fdesc_write(), and fdesc_ioctl() nodes, since we no longer have nodes that get special handling. o Correct the component name validity-checking in fdesc_lookup(). It previously detected the end of the string by checking for a terminating NUL, now it uses cnp->cn_namelen. o Handle kqueue files as FIFOs. This is probably the closest file type to represent this type of file there is, and it is unfortunately not very representative of a kqueue. Creation time is not supported by kqueue, so ctime, mtime and atime are all set to the current time when getattr() was called. o Also set st_[mca]time to the current time since there's no data in socket structures that can be used to fill this in (FIFOs). o Simplify fdesc_readdir() since it only has to report the numbered fd nodes. Add `.' and `..' directory links as well. o Remove read bits from directories as they tend to confuse programs like tar(1). Reviewed by: phk Discussed with: bde (earlier on, not quite review)
2000-05-11 22:10:51 +00:00
Fdesc
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
} fdntype;
struct fdescnode {
Back out the previous change to the queue(3) interface. It was not discussed and should probably not happen. Requested by: msmith and others
2000-05-26 02:09:24 +00:00
LIST_ENTRY(fdescnode) fd_hash; /* Hash list */
BSD 4.4 Lite Kernel Sources
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struct vnode *fd_vnode; /* Back ptr to vnode */
fdntype fd_type; /* Type of this node */
unsigned fd_fd; /* Fd to be dup'ed */
int fd_ix; /* filesystem index */
};
- Add locking to all filesystem operations in fdescfs and flag it as MPSAFE. - Use proper synhronization primitives to protect the internal fdesc node cache used in fdescfs. - Properly initialize and uninitalize hash. - Remove unused functions. Since fdescfs might recurse on itself, adding proper locking to it needed some tricky workarounds in some parts to make it work. For instance, a descriptor in fdescfs could refer to an open descriptor to itself, thus forcing the thread to recurse on vnode locks. Because of this, other race conditions also had to be fixed. Tested by: pho Reviewed by: kib (mentor) Approved by: kib (mentor)
2008-05-24 14:51:30 +00:00
extern struct mtx fdesc_hashmtx;
BSD 4.4 Lite Kernel Sources
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#define VFSTOFDESC(mp) ((struct fdescmount *)((mp)->mnt_data))
#define VTOFDESC(vp) ((struct fdescnode *)(vp)->v_data)
Make VFS_ROOT() and vflush() take a thread argument. This is to allow filesystems to decide based on the passed thread which vnode to return. Several filesystems used curthread, they now use the passed thread.
2004-07-12 08:14:09 +00:00
extern vfs_init_t fdesc_init;
- Add locking to all filesystem operations in fdescfs and flag it as MPSAFE. - Use proper synhronization primitives to protect the internal fdesc node cache used in fdescfs. - Properly initialize and uninitalize hash. - Remove unused functions. Since fdescfs might recurse on itself, adding proper locking to it needed some tricky workarounds in some parts to make it work. For instance, a descriptor in fdescfs could refer to an open descriptor to itself, thus forcing the thread to recurse on vnode locks. Because of this, other race conditions also had to be fixed. Tested by: pho Reviewed by: kib (mentor) Approved by: kib (mentor)
2008-05-24 14:51:30 +00:00
extern vfs_uninit_t fdesc_uninit;
extern int fdesc_allocvp(fdntype, unsigned, int, struct mount *,
Remove the thread argument from the FSD (File-System Dependent) parts of the VFS. Now all the VFS_* functions and relating parts don't want the context as long as it always refers to curthread. In some points, in particular when dealing with VOPs and functions living in the same namespace (eg. vflush) which still need to be converted, pass curthread explicitly in order to retain the old behaviour. Such loose ends will be fixed ASAP. While here fix a bug: now, UFS_EXTATTR can be compiled alone without the UFS_EXTATTR_AUTOSTART option. VFS KPI is heavilly changed by this commit so thirdy parts modules needs to be recompiled. Bump __FreeBSD_version in order to signal such situation.
2009-05-11 15:33:26 +00:00
struct vnode **);
Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL" is an application space macro and the applications are supposed to be free to use it as they please (but cannot). This is consistant with the other BSD's who made this change quite some time ago. More commits to come.
1999-12-29 05:07:58 +00:00
#endif /* _KERNEL */
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