Full support for Ginger Console
[linux-ginger.git] / fs / xfs / linux-2.6 / xfs_file.c
blobeff61e2732af27c8aad199ebab5c66d83c5b904f
1 /*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 #include "xfs.h"
19 #include "xfs_bit.h"
20 #include "xfs_log.h"
21 #include "xfs_inum.h"
22 #include "xfs_sb.h"
23 #include "xfs_ag.h"
24 #include "xfs_dir2.h"
25 #include "xfs_trans.h"
26 #include "xfs_dmapi.h"
27 #include "xfs_mount.h"
28 #include "xfs_bmap_btree.h"
29 #include "xfs_alloc_btree.h"
30 #include "xfs_ialloc_btree.h"
31 #include "xfs_alloc.h"
32 #include "xfs_btree.h"
33 #include "xfs_attr_sf.h"
34 #include "xfs_dir2_sf.h"
35 #include "xfs_dinode.h"
36 #include "xfs_inode.h"
37 #include "xfs_error.h"
38 #include "xfs_rw.h"
39 #include "xfs_vnodeops.h"
40 #include "xfs_da_btree.h"
41 #include "xfs_ioctl.h"
43 #include <linux/dcache.h>
45 static const struct vm_operations_struct xfs_file_vm_ops;
47 STATIC ssize_t
48 xfs_file_aio_read(
49 struct kiocb *iocb,
50 const struct iovec *iov,
51 unsigned long nr_segs,
52 loff_t pos)
54 struct file *file = iocb->ki_filp;
55 int ioflags = IO_ISAIO;
57 BUG_ON(iocb->ki_pos != pos);
58 if (unlikely(file->f_flags & O_DIRECT))
59 ioflags |= IO_ISDIRECT;
60 if (file->f_mode & FMODE_NOCMTIME)
61 ioflags |= IO_INVIS;
62 return xfs_read(XFS_I(file->f_path.dentry->d_inode), iocb, iov,
63 nr_segs, &iocb->ki_pos, ioflags);
66 STATIC ssize_t
67 xfs_file_aio_write(
68 struct kiocb *iocb,
69 const struct iovec *iov,
70 unsigned long nr_segs,
71 loff_t pos)
73 struct file *file = iocb->ki_filp;
74 int ioflags = IO_ISAIO;
76 BUG_ON(iocb->ki_pos != pos);
77 if (unlikely(file->f_flags & O_DIRECT))
78 ioflags |= IO_ISDIRECT;
79 if (file->f_mode & FMODE_NOCMTIME)
80 ioflags |= IO_INVIS;
81 return xfs_write(XFS_I(file->f_mapping->host), iocb, iov, nr_segs,
82 &iocb->ki_pos, ioflags);
85 STATIC ssize_t
86 xfs_file_splice_read(
87 struct file *infilp,
88 loff_t *ppos,
89 struct pipe_inode_info *pipe,
90 size_t len,
91 unsigned int flags)
93 int ioflags = 0;
95 if (infilp->f_mode & FMODE_NOCMTIME)
96 ioflags |= IO_INVIS;
98 return xfs_splice_read(XFS_I(infilp->f_path.dentry->d_inode),
99 infilp, ppos, pipe, len, flags, ioflags);
102 STATIC ssize_t
103 xfs_file_splice_write(
104 struct pipe_inode_info *pipe,
105 struct file *outfilp,
106 loff_t *ppos,
107 size_t len,
108 unsigned int flags)
110 int ioflags = 0;
112 if (outfilp->f_mode & FMODE_NOCMTIME)
113 ioflags |= IO_INVIS;
115 return xfs_splice_write(XFS_I(outfilp->f_path.dentry->d_inode),
116 pipe, outfilp, ppos, len, flags, ioflags);
119 STATIC int
120 xfs_file_open(
121 struct inode *inode,
122 struct file *file)
124 if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
125 return -EFBIG;
126 if (XFS_FORCED_SHUTDOWN(XFS_M(inode->i_sb)))
127 return -EIO;
128 return 0;
131 STATIC int
132 xfs_dir_open(
133 struct inode *inode,
134 struct file *file)
136 struct xfs_inode *ip = XFS_I(inode);
137 int mode;
138 int error;
140 error = xfs_file_open(inode, file);
141 if (error)
142 return error;
145 * If there are any blocks, read-ahead block 0 as we're almost
146 * certain to have the next operation be a read there.
148 mode = xfs_ilock_map_shared(ip);
149 if (ip->i_d.di_nextents > 0)
150 xfs_da_reada_buf(NULL, ip, 0, XFS_DATA_FORK);
151 xfs_iunlock(ip, mode);
152 return 0;
155 STATIC int
156 xfs_file_release(
157 struct inode *inode,
158 struct file *filp)
160 return -xfs_release(XFS_I(inode));
164 * We ignore the datasync flag here because a datasync is effectively
165 * identical to an fsync. That is, datasync implies that we need to write
166 * only the metadata needed to be able to access the data that is written
167 * if we crash after the call completes. Hence if we are writing beyond
168 * EOF we have to log the inode size change as well, which makes it a
169 * full fsync. If we don't write beyond EOF, the inode core will be
170 * clean in memory and so we don't need to log the inode, just like
171 * fsync.
173 STATIC int
174 xfs_file_fsync(
175 struct file *file,
176 struct dentry *dentry,
177 int datasync)
179 struct xfs_inode *ip = XFS_I(dentry->d_inode);
181 xfs_iflags_clear(ip, XFS_ITRUNCATED);
182 return -xfs_fsync(ip);
185 STATIC int
186 xfs_file_readdir(
187 struct file *filp,
188 void *dirent,
189 filldir_t filldir)
191 struct inode *inode = filp->f_path.dentry->d_inode;
192 xfs_inode_t *ip = XFS_I(inode);
193 int error;
194 size_t bufsize;
197 * The Linux API doesn't pass down the total size of the buffer
198 * we read into down to the filesystem. With the filldir concept
199 * it's not needed for correct information, but the XFS dir2 leaf
200 * code wants an estimate of the buffer size to calculate it's
201 * readahead window and size the buffers used for mapping to
202 * physical blocks.
204 * Try to give it an estimate that's good enough, maybe at some
205 * point we can change the ->readdir prototype to include the
206 * buffer size.
208 bufsize = (size_t)min_t(loff_t, PAGE_SIZE, ip->i_d.di_size);
210 error = xfs_readdir(ip, dirent, bufsize,
211 (xfs_off_t *)&filp->f_pos, filldir);
212 if (error)
213 return -error;
214 return 0;
217 STATIC int
218 xfs_file_mmap(
219 struct file *filp,
220 struct vm_area_struct *vma)
222 vma->vm_ops = &xfs_file_vm_ops;
223 vma->vm_flags |= VM_CAN_NONLINEAR;
225 file_accessed(filp);
226 return 0;
230 * mmap()d file has taken write protection fault and is being made
231 * writable. We can set the page state up correctly for a writable
232 * page, which means we can do correct delalloc accounting (ENOSPC
233 * checking!) and unwritten extent mapping.
235 STATIC int
236 xfs_vm_page_mkwrite(
237 struct vm_area_struct *vma,
238 struct vm_fault *vmf)
240 return block_page_mkwrite(vma, vmf, xfs_get_blocks);
243 const struct file_operations xfs_file_operations = {
244 .llseek = generic_file_llseek,
245 .read = do_sync_read,
246 .write = do_sync_write,
247 .aio_read = xfs_file_aio_read,
248 .aio_write = xfs_file_aio_write,
249 .splice_read = xfs_file_splice_read,
250 .splice_write = xfs_file_splice_write,
251 .unlocked_ioctl = xfs_file_ioctl,
252 #ifdef CONFIG_COMPAT
253 .compat_ioctl = xfs_file_compat_ioctl,
254 #endif
255 .mmap = xfs_file_mmap,
256 .open = xfs_file_open,
257 .release = xfs_file_release,
258 .fsync = xfs_file_fsync,
259 #ifdef HAVE_FOP_OPEN_EXEC
260 .open_exec = xfs_file_open_exec,
261 #endif
264 const struct file_operations xfs_dir_file_operations = {
265 .open = xfs_dir_open,
266 .read = generic_read_dir,
267 .readdir = xfs_file_readdir,
268 .llseek = generic_file_llseek,
269 .unlocked_ioctl = xfs_file_ioctl,
270 #ifdef CONFIG_COMPAT
271 .compat_ioctl = xfs_file_compat_ioctl,
272 #endif
273 .fsync = xfs_file_fsync,
276 static const struct vm_operations_struct xfs_file_vm_ops = {
277 .fault = filemap_fault,
278 .page_mkwrite = xfs_vm_page_mkwrite,