| /* |
| * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| * |
| * This program 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. |
| * |
| * This program is distributed in the hope that it would 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 this program; if not, write the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| #include "xfs.h" |
| #include "xfs_bit.h" |
| #include "xfs_log.h" |
| #include "xfs_inum.h" |
| #include "xfs_sb.h" |
| #include "xfs_ag.h" |
| #include "xfs_dir.h" |
| #include "xfs_dir2.h" |
| #include "xfs_trans.h" |
| #include "xfs_dmapi.h" |
| #include "xfs_mount.h" |
| #include "xfs_bmap_btree.h" |
| #include "xfs_alloc_btree.h" |
| #include "xfs_ialloc_btree.h" |
| #include "xfs_alloc.h" |
| #include "xfs_btree.h" |
| #include "xfs_attr_sf.h" |
| #include "xfs_dir_sf.h" |
| #include "xfs_dir2_sf.h" |
| #include "xfs_dinode.h" |
| #include "xfs_inode.h" |
| #include "xfs_error.h" |
| #include "xfs_rw.h" |
| #include "xfs_ioctl32.h" |
| |
| #include <linux/dcache.h> |
| #include <linux/smp_lock.h> |
| |
| static struct vm_operations_struct xfs_file_vm_ops; |
| #ifdef CONFIG_XFS_DMAPI |
| static struct vm_operations_struct xfs_dmapi_file_vm_ops; |
| #endif |
| |
| STATIC inline ssize_t |
| __xfs_file_read( |
| struct kiocb *iocb, |
| char __user *buf, |
| int ioflags, |
| size_t count, |
| loff_t pos) |
| { |
| struct iovec iov = {buf, count}; |
| struct file *file = iocb->ki_filp; |
| vnode_t *vp = LINVFS_GET_VP(file->f_dentry->d_inode); |
| ssize_t rval; |
| |
| BUG_ON(iocb->ki_pos != pos); |
| |
| if (unlikely(file->f_flags & O_DIRECT)) |
| ioflags |= IO_ISDIRECT; |
| VOP_READ(vp, iocb, &iov, 1, &iocb->ki_pos, ioflags, NULL, rval); |
| return rval; |
| } |
| |
| |
| STATIC ssize_t |
| xfs_file_aio_read( |
| struct kiocb *iocb, |
| char __user *buf, |
| size_t count, |
| loff_t pos) |
| { |
| return __xfs_file_read(iocb, buf, IO_ISAIO, count, pos); |
| } |
| |
| STATIC ssize_t |
| xfs_file_aio_read_invis( |
| struct kiocb *iocb, |
| char __user *buf, |
| size_t count, |
| loff_t pos) |
| { |
| return __xfs_file_read(iocb, buf, IO_ISAIO|IO_INVIS, count, pos); |
| } |
| |
| |
| STATIC inline ssize_t |
| __xfs_file_write( |
| struct kiocb *iocb, |
| const char __user *buf, |
| int ioflags, |
| size_t count, |
| loff_t pos) |
| { |
| struct iovec iov = {(void __user *)buf, count}; |
| struct file *file = iocb->ki_filp; |
| struct inode *inode = file->f_mapping->host; |
| vnode_t *vp = LINVFS_GET_VP(inode); |
| ssize_t rval; |
| |
| BUG_ON(iocb->ki_pos != pos); |
| if (unlikely(file->f_flags & O_DIRECT)) |
| ioflags |= IO_ISDIRECT; |
| |
| VOP_WRITE(vp, iocb, &iov, 1, &iocb->ki_pos, ioflags, NULL, rval); |
| return rval; |
| } |
| |
| |
| STATIC ssize_t |
| xfs_file_aio_write( |
| struct kiocb *iocb, |
| const char __user *buf, |
| size_t count, |
| loff_t pos) |
| { |
| return __xfs_file_write(iocb, buf, IO_ISAIO, count, pos); |
| } |
| |
| STATIC ssize_t |
| xfs_file_aio_write_invis( |
| struct kiocb *iocb, |
| const char __user *buf, |
| size_t count, |
| loff_t pos) |
| { |
| return __xfs_file_write(iocb, buf, IO_ISAIO|IO_INVIS, count, pos); |
| } |
| |
| |
| STATIC inline ssize_t |
| __xfs_file_readv( |
| struct file *file, |
| const struct iovec *iov, |
| int ioflags, |
| unsigned long nr_segs, |
| loff_t *ppos) |
| { |
| struct inode *inode = file->f_mapping->host; |
| vnode_t *vp = LINVFS_GET_VP(inode); |
| struct kiocb kiocb; |
| ssize_t rval; |
| |
| init_sync_kiocb(&kiocb, file); |
| kiocb.ki_pos = *ppos; |
| |
| if (unlikely(file->f_flags & O_DIRECT)) |
| ioflags |= IO_ISDIRECT; |
| VOP_READ(vp, &kiocb, iov, nr_segs, &kiocb.ki_pos, ioflags, NULL, rval); |
| |
| *ppos = kiocb.ki_pos; |
| return rval; |
| } |
| |
| STATIC ssize_t |
| xfs_file_readv( |
| struct file *file, |
| const struct iovec *iov, |
| unsigned long nr_segs, |
| loff_t *ppos) |
| { |
| return __xfs_file_readv(file, iov, 0, nr_segs, ppos); |
| } |
| |
| STATIC ssize_t |
| xfs_file_readv_invis( |
| struct file *file, |
| const struct iovec *iov, |
| unsigned long nr_segs, |
| loff_t *ppos) |
| { |
| return __xfs_file_readv(file, iov, IO_INVIS, nr_segs, ppos); |
| } |
| |
| |
| STATIC inline ssize_t |
| __xfs_file_writev( |
| struct file *file, |
| const struct iovec *iov, |
| int ioflags, |
| unsigned long nr_segs, |
| loff_t *ppos) |
| { |
| struct inode *inode = file->f_mapping->host; |
| vnode_t *vp = LINVFS_GET_VP(inode); |
| struct kiocb kiocb; |
| ssize_t rval; |
| |
| init_sync_kiocb(&kiocb, file); |
| kiocb.ki_pos = *ppos; |
| if (unlikely(file->f_flags & O_DIRECT)) |
| ioflags |= IO_ISDIRECT; |
| |
| VOP_WRITE(vp, &kiocb, iov, nr_segs, &kiocb.ki_pos, ioflags, NULL, rval); |
| |
| *ppos = kiocb.ki_pos; |
| return rval; |
| } |
| |
| |
| STATIC ssize_t |
| xfs_file_writev( |
| struct file *file, |
| const struct iovec *iov, |
| unsigned long nr_segs, |
| loff_t *ppos) |
| { |
| return __xfs_file_writev(file, iov, 0, nr_segs, ppos); |
| } |
| |
| STATIC ssize_t |
| xfs_file_writev_invis( |
| struct file *file, |
| const struct iovec *iov, |
| unsigned long nr_segs, |
| loff_t *ppos) |
| { |
| return __xfs_file_writev(file, iov, IO_INVIS, nr_segs, ppos); |
| } |
| |
| STATIC ssize_t |
| xfs_file_sendfile( |
| struct file *filp, |
| loff_t *ppos, |
| size_t count, |
| read_actor_t actor, |
| void *target) |
| { |
| vnode_t *vp = LINVFS_GET_VP(filp->f_dentry->d_inode); |
| ssize_t rval; |
| |
| VOP_SENDFILE(vp, filp, ppos, 0, count, actor, target, NULL, rval); |
| return rval; |
| } |
| |
| |
| STATIC int |
| xfs_file_open( |
| struct inode *inode, |
| struct file *filp) |
| { |
| vnode_t *vp = LINVFS_GET_VP(inode); |
| int error; |
| |
| if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS) |
| return -EFBIG; |
| |
| ASSERT(vp); |
| VOP_OPEN(vp, NULL, error); |
| return -error; |
| } |
| |
| |
| STATIC int |
| xfs_file_release( |
| struct inode *inode, |
| struct file *filp) |
| { |
| vnode_t *vp = LINVFS_GET_VP(inode); |
| int error = 0; |
| |
| if (vp) |
| VOP_RELEASE(vp, error); |
| return -error; |
| } |
| |
| |
| STATIC int |
| xfs_file_fsync( |
| struct file *filp, |
| struct dentry *dentry, |
| int datasync) |
| { |
| struct inode *inode = dentry->d_inode; |
| vnode_t *vp = LINVFS_GET_VP(inode); |
| int error; |
| int flags = FSYNC_WAIT; |
| |
| if (datasync) |
| flags |= FSYNC_DATA; |
| |
| ASSERT(vp); |
| VOP_FSYNC(vp, flags, NULL, (xfs_off_t)0, (xfs_off_t)-1, error); |
| return -error; |
| } |
| |
| /* |
| * xfs_file_readdir maps to VOP_READDIR(). |
| * We need to build a uio, cred, ... |
| */ |
| |
| #define nextdp(dp) ((struct xfs_dirent *)((char *)(dp) + (dp)->d_reclen)) |
| |
| #ifdef CONFIG_XFS_DMAPI |
| |
| STATIC struct page * |
| xfs_vm_nopage( |
| struct vm_area_struct *area, |
| unsigned long address, |
| int *type) |
| { |
| struct inode *inode = area->vm_file->f_dentry->d_inode; |
| vnode_t *vp = LINVFS_GET_VP(inode); |
| xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp); |
| int error; |
| |
| ASSERT_ALWAYS(vp->v_vfsp->vfs_flag & VFS_DMI); |
| |
| error = XFS_SEND_MMAP(mp, area, 0); |
| if (error) |
| return NULL; |
| |
| return filemap_nopage(area, address, type); |
| } |
| |
| #endif /* CONFIG_XFS_DMAPI */ |
| |
| |
| STATIC int |
| xfs_file_readdir( |
| struct file *filp, |
| void *dirent, |
| filldir_t filldir) |
| { |
| int error = 0; |
| vnode_t *vp; |
| uio_t uio; |
| iovec_t iov; |
| int eof = 0; |
| caddr_t read_buf; |
| int namelen, size = 0; |
| size_t rlen = PAGE_CACHE_SIZE; |
| xfs_off_t start_offset, curr_offset; |
| xfs_dirent_t *dbp = NULL; |
| |
| vp = LINVFS_GET_VP(filp->f_dentry->d_inode); |
| ASSERT(vp); |
| |
| /* Try fairly hard to get memory */ |
| do { |
| if ((read_buf = (caddr_t)kmalloc(rlen, GFP_KERNEL))) |
| break; |
| rlen >>= 1; |
| } while (rlen >= 1024); |
| |
| if (read_buf == NULL) |
| return -ENOMEM; |
| |
| uio.uio_iov = &iov; |
| uio.uio_segflg = UIO_SYSSPACE; |
| curr_offset = filp->f_pos; |
| if (filp->f_pos != 0x7fffffff) |
| uio.uio_offset = filp->f_pos; |
| else |
| uio.uio_offset = 0xffffffff; |
| |
| while (!eof) { |
| uio.uio_resid = iov.iov_len = rlen; |
| iov.iov_base = read_buf; |
| uio.uio_iovcnt = 1; |
| |
| start_offset = uio.uio_offset; |
| |
| VOP_READDIR(vp, &uio, NULL, &eof, error); |
| if ((uio.uio_offset == start_offset) || error) { |
| size = 0; |
| break; |
| } |
| |
| size = rlen - uio.uio_resid; |
| dbp = (xfs_dirent_t *)read_buf; |
| while (size > 0) { |
| namelen = strlen(dbp->d_name); |
| |
| if (filldir(dirent, dbp->d_name, namelen, |
| (loff_t) curr_offset & 0x7fffffff, |
| (ino_t) dbp->d_ino, |
| DT_UNKNOWN)) { |
| goto done; |
| } |
| size -= dbp->d_reclen; |
| curr_offset = (loff_t)dbp->d_off /* & 0x7fffffff */; |
| dbp = nextdp(dbp); |
| } |
| } |
| done: |
| if (!error) { |
| if (size == 0) |
| filp->f_pos = uio.uio_offset & 0x7fffffff; |
| else if (dbp) |
| filp->f_pos = curr_offset; |
| } |
| |
| kfree(read_buf); |
| return -error; |
| } |
| |
| |
| STATIC int |
| xfs_file_mmap( |
| struct file *filp, |
| struct vm_area_struct *vma) |
| { |
| struct inode *ip = filp->f_dentry->d_inode; |
| vnode_t *vp = LINVFS_GET_VP(ip); |
| vattr_t vattr; |
| int error; |
| |
| vma->vm_ops = &xfs_file_vm_ops; |
| |
| #ifdef CONFIG_XFS_DMAPI |
| if (vp->v_vfsp->vfs_flag & VFS_DMI) { |
| vma->vm_ops = &xfs_dmapi_file_vm_ops; |
| } |
| #endif /* CONFIG_XFS_DMAPI */ |
| |
| vattr.va_mask = XFS_AT_UPDATIME; |
| VOP_SETATTR(vp, &vattr, XFS_AT_UPDATIME, NULL, error); |
| if (likely(!error)) |
| __vn_revalidate(vp, &vattr); /* update flags */ |
| return 0; |
| } |
| |
| |
| STATIC long |
| xfs_file_ioctl( |
| struct file *filp, |
| unsigned int cmd, |
| unsigned long arg) |
| { |
| int error; |
| struct inode *inode = filp->f_dentry->d_inode; |
| vnode_t *vp = LINVFS_GET_VP(inode); |
| |
| VOP_IOCTL(vp, inode, filp, 0, cmd, (void __user *)arg, error); |
| VMODIFY(vp); |
| |
| /* NOTE: some of the ioctl's return positive #'s as a |
| * byte count indicating success, such as |
| * readlink_by_handle. So we don't "sign flip" |
| * like most other routines. This means true |
| * errors need to be returned as a negative value. |
| */ |
| return error; |
| } |
| |
| STATIC long |
| xfs_file_ioctl_invis( |
| struct file *filp, |
| unsigned int cmd, |
| unsigned long arg) |
| { |
| int error; |
| struct inode *inode = filp->f_dentry->d_inode; |
| vnode_t *vp = LINVFS_GET_VP(inode); |
| |
| ASSERT(vp); |
| VOP_IOCTL(vp, inode, filp, IO_INVIS, cmd, (void __user *)arg, error); |
| VMODIFY(vp); |
| |
| /* NOTE: some of the ioctl's return positive #'s as a |
| * byte count indicating success, such as |
| * readlink_by_handle. So we don't "sign flip" |
| * like most other routines. This means true |
| * errors need to be returned as a negative value. |
| */ |
| return error; |
| } |
| |
| #ifdef CONFIG_XFS_DMAPI |
| #ifdef HAVE_VMOP_MPROTECT |
| STATIC int |
| xfs_vm_mprotect( |
| struct vm_area_struct *vma, |
| unsigned int newflags) |
| { |
| vnode_t *vp = LINVFS_GET_VP(vma->vm_file->f_dentry->d_inode); |
| int error = 0; |
| |
| if (vp->v_vfsp->vfs_flag & VFS_DMI) { |
| if ((vma->vm_flags & VM_MAYSHARE) && |
| (newflags & VM_WRITE) && !(vma->vm_flags & VM_WRITE)) { |
| xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp); |
| |
| error = XFS_SEND_MMAP(mp, vma, VM_WRITE); |
| } |
| } |
| return error; |
| } |
| #endif /* HAVE_VMOP_MPROTECT */ |
| #endif /* CONFIG_XFS_DMAPI */ |
| |
| #ifdef HAVE_FOP_OPEN_EXEC |
| /* If the user is attempting to execute a file that is offline then |
| * we have to trigger a DMAPI READ event before the file is marked as busy |
| * otherwise the invisible I/O will not be able to write to the file to bring |
| * it back online. |
| */ |
| STATIC int |
| xfs_file_open_exec( |
| struct inode *inode) |
| { |
| vnode_t *vp = LINVFS_GET_VP(inode); |
| xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp); |
| int error = 0; |
| xfs_inode_t *ip; |
| |
| if (vp->v_vfsp->vfs_flag & VFS_DMI) { |
| ip = xfs_vtoi(vp); |
| if (!ip) { |
| error = -EINVAL; |
| goto open_exec_out; |
| } |
| if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ)) { |
| error = -XFS_SEND_DATA(mp, DM_EVENT_READ, vp, |
| 0, 0, 0, NULL); |
| } |
| } |
| open_exec_out: |
| return error; |
| } |
| #endif /* HAVE_FOP_OPEN_EXEC */ |
| |
| struct file_operations xfs_file_operations = { |
| .llseek = generic_file_llseek, |
| .read = do_sync_read, |
| .write = do_sync_write, |
| .readv = xfs_file_readv, |
| .writev = xfs_file_writev, |
| .aio_read = xfs_file_aio_read, |
| .aio_write = xfs_file_aio_write, |
| .sendfile = xfs_file_sendfile, |
| .unlocked_ioctl = xfs_file_ioctl, |
| #ifdef CONFIG_COMPAT |
| .compat_ioctl = xfs_file_compat_ioctl, |
| #endif |
| .mmap = xfs_file_mmap, |
| .open = xfs_file_open, |
| .release = xfs_file_release, |
| .fsync = xfs_file_fsync, |
| #ifdef HAVE_FOP_OPEN_EXEC |
| .open_exec = xfs_file_open_exec, |
| #endif |
| }; |
| |
| struct file_operations xfs_invis_file_operations = { |
| .llseek = generic_file_llseek, |
| .read = do_sync_read, |
| .write = do_sync_write, |
| .readv = xfs_file_readv_invis, |
| .writev = xfs_file_writev_invis, |
| .aio_read = xfs_file_aio_read_invis, |
| .aio_write = xfs_file_aio_write_invis, |
| .sendfile = xfs_file_sendfile, |
| .unlocked_ioctl = xfs_file_ioctl_invis, |
| #ifdef CONFIG_COMPAT |
| .compat_ioctl = xfs_file_compat_invis_ioctl, |
| #endif |
| .mmap = xfs_file_mmap, |
| .open = xfs_file_open, |
| .release = xfs_file_release, |
| .fsync = xfs_file_fsync, |
| }; |
| |
| |
| struct file_operations xfs_dir_file_operations = { |
| .read = generic_read_dir, |
| .readdir = xfs_file_readdir, |
| .unlocked_ioctl = xfs_file_ioctl, |
| #ifdef CONFIG_COMPAT |
| .compat_ioctl = xfs_file_compat_ioctl, |
| #endif |
| .fsync = xfs_file_fsync, |
| }; |
| |
| static struct vm_operations_struct xfs_file_vm_ops = { |
| .nopage = filemap_nopage, |
| .populate = filemap_populate, |
| }; |
| |
| #ifdef CONFIG_XFS_DMAPI |
| static struct vm_operations_struct xfs_dmapi_file_vm_ops = { |
| .nopage = xfs_vm_nopage, |
| .populate = filemap_populate, |
| #ifdef HAVE_VMOP_MPROTECT |
| .mprotect = xfs_vm_mprotect, |
| #endif |
| }; |
| #endif /* CONFIG_XFS_DMAPI */ |