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bbdc6ae495
This adds an interface to "punch holes" (deallocate space) in VFS files. The interface is identical to the Solaris VOP_SPACE interface. This interface is necessary for TRIM support on file vdevs. This is implemented using Linux fallocate(FALLOC_FL_PUNCH_HOLE), which was introduced in 2.6.38. For a brief time before 2.6.38 this was done using the truncate_range inode operation, which was quickly deprecated. This patch only supports FALLOC_FL_PUNCH_HOLE. This adds support for the truncate_range() inode operation to VOP_SPACE() for file hole punching. This API is deprecated and removed in 3.5, so it's only useful for old kernels. On tmpfs, the truncate_range() inode operation translates to shmem_truncate_range(). Unfortunately, this function expects the end offset to be inclusive and aligned to the end of a page. If it is not, the kernel will stop with a BUG_ON(). This patch fixes the issue by adapting to the constraints set forth by shmem_truncate_range(). Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #168
214 lines
6.5 KiB
C
214 lines
6.5 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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/*
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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_SYNC
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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 F_FREESP 11 /* Free file space */
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/*
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* The vnode AT_ flags are mapped to the Linux ATTR_* flags.
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* This allows them to be used safely with an iattr structure.
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* The AT_XVATTR flag has been added and mapped to the upper
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* bit range to avoid conflicting with the standard Linux set.
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*/
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#undef AT_UID
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#undef AT_GID
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#define AT_MODE ATTR_MODE
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#define AT_UID ATTR_UID
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#define AT_GID ATTR_GID
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#define AT_SIZE ATTR_SIZE
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#define AT_ATIME ATTR_ATIME
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#define AT_MTIME ATTR_MTIME
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#define AT_CTIME ATTR_CTIME
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#define ATTR_XVATTR (1 << 31)
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#define AT_XVATTR ATTR_XVATTR
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#define ATTR_IATTR_MASK (ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_SIZE | \
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ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_FILE)
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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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#define LOOKUP_DIR 0x01
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#define LOOKUP_XATTR 0x02
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#define CREATE_XATTR_DIR 0x04
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#define ATTR_NOACLCHECK 0x20
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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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uid_t va_uid; /* owner uid */
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gid_t 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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uint32_t va_nlink; /* # links */
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uint64_t va_size; /* file size */
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struct timespec va_atime; /* last acc */
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struct timespec va_mtime; /* last mod */
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struct timespec va_ctime; /* last chg */
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dev_t va_rdev; /* dev */
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uint64_t va_nblocks; /* space used */
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uint32_t va_blksize; /* block size */
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uint32_t va_seq; /* sequence */
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struct dentry *va_dentry; /* dentry to wire */
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} vattr_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 task_struct *f_task; /* linux task this fd belongs to */
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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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extern vnode_t *vn_alloc(int flag);
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void vn_free(vnode_t *vp);
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extern vtype_t vn_mode_to_vtype(mode_t);
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extern mode_t vn_vtype_to_mode(vtype_t);
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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, void *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 int vn_space(vnode_t *vp, int cmd, struct flock *bfp, int flag,
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offset_t offset, void *x6, void *x7);
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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 spl_vn_init_kallsyms_lookup(void);
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int spl_vn_init(void);
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void spl_vn_fini(void);
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#define VOP_CLOSE vn_close
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#define VOP_SEEK vn_seek
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#define VOP_GETATTR vn_getattr
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#define VOP_FSYNC vn_fsync
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#define VOP_SPACE vn_space
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#define VOP_PUTPAGE(vp, o, s, f, x1, x2) ((void)0)
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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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