file.c (ffc18879903e55487bc5ac3c774b99a07de06029) file.c (155130a4f7848b1aac439cab6bda1a175507c71c)
1/*
2 * OMFS (as used by RIO Karma) file operations.
3 * Copyright (C) 2005 Bob Copeland <me@bobcopeland.com>
4 * Released under GPL v2.
5 */
6
7#include <linux/version.h>
8#include <linux/module.h>

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45 */
46 next = inode->i_ino;
47
48 /* only support truncate -> 0 for now */
49 ret = -EIO;
50 if (inode->i_size != 0)
51 goto out;
52
1/*
2 * OMFS (as used by RIO Karma) file operations.
3 * Copyright (C) 2005 Bob Copeland <me@bobcopeland.com>
4 * Released under GPL v2.
5 */
6
7#include <linux/version.h>
8#include <linux/module.h>

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45 */
46 next = inode->i_ino;
47
48 /* only support truncate -> 0 for now */
49 ret = -EIO;
50 if (inode->i_size != 0)
51 goto out;
52
53 bh = omfs_bread(inode->i_sb, next);
53 bh = sb_bread(inode->i_sb, clus_to_blk(sbi, next));
54 if (!bh)
55 goto out;
56
57 oe = (struct omfs_extent *)(&bh->b_data[OMFS_EXTENT_START]);
58 max_extents = omfs_max_extents(sbi, OMFS_EXTENT_START);
59
60 for (;;) {
61

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85 brelse(bh);
86
87 if (last != inode->i_ino)
88 omfs_clear_range(inode->i_sb, last, sbi->s_mirrors);
89
90 if (next == ~0)
91 break;
92
54 if (!bh)
55 goto out;
56
57 oe = (struct omfs_extent *)(&bh->b_data[OMFS_EXTENT_START]);
58 max_extents = omfs_max_extents(sbi, OMFS_EXTENT_START);
59
60 for (;;) {
61

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85 brelse(bh);
86
87 if (last != inode->i_ino)
88 omfs_clear_range(inode->i_sb, last, sbi->s_mirrors);
89
90 if (next == ~0)
91 break;
92
93 bh = omfs_bread(inode->i_sb, next);
93 bh = sb_bread(inode->i_sb, clus_to_blk(sbi, next));
94 if (!bh)
95 goto out;
96 oe = (struct omfs_extent *) (&bh->b_data[OMFS_EXTENT_CONT]);
97 max_extents = omfs_max_extents(sbi, OMFS_EXTENT_CONT);
98 }
99 ret = 0;
100out:
101 return ret;

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217}
218
219static int omfs_get_block(struct inode *inode, sector_t block,
220 struct buffer_head *bh_result, int create)
221{
222 struct buffer_head *bh;
223 sector_t next, offset;
224 int ret;
94 if (!bh)
95 goto out;
96 oe = (struct omfs_extent *) (&bh->b_data[OMFS_EXTENT_CONT]);
97 max_extents = omfs_max_extents(sbi, OMFS_EXTENT_CONT);
98 }
99 ret = 0;
100out:
101 return ret;

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217}
218
219static int omfs_get_block(struct inode *inode, sector_t block,
220 struct buffer_head *bh_result, int create)
221{
222 struct buffer_head *bh;
223 sector_t next, offset;
224 int ret;
225 u64 uninitialized_var(new_block);
225 u64 new_block;
226 u32 max_extents;
227 int extent_count;
228 struct omfs_extent *oe;
229 struct omfs_extent_entry *entry;
230 struct omfs_sb_info *sbi = OMFS_SB(inode->i_sb);
231 int max_blocks = bh_result->b_size >> inode->i_blkbits;
232 int remain;
233
234 ret = -EIO;
226 u32 max_extents;
227 int extent_count;
228 struct omfs_extent *oe;
229 struct omfs_extent_entry *entry;
230 struct omfs_sb_info *sbi = OMFS_SB(inode->i_sb);
231 int max_blocks = bh_result->b_size >> inode->i_blkbits;
232 int remain;
233
234 ret = -EIO;
235 bh = omfs_bread(inode->i_sb, inode->i_ino);
235 bh = sb_bread(inode->i_sb, clus_to_blk(sbi, inode->i_ino));
236 if (!bh)
237 goto out;
238
239 oe = (struct omfs_extent *)(&bh->b_data[OMFS_EXTENT_START]);
240 max_extents = omfs_max_extents(sbi, OMFS_EXTENT_START);
241 next = inode->i_ino;
242
243 for (;;) {

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260 remain = max_blocks;
261 bh_result->b_size = (remain << inode->i_blkbits);
262 goto out_brelse;
263 }
264 if (next == ~0)
265 break;
266
267 brelse(bh);
236 if (!bh)
237 goto out;
238
239 oe = (struct omfs_extent *)(&bh->b_data[OMFS_EXTENT_START]);
240 max_extents = omfs_max_extents(sbi, OMFS_EXTENT_START);
241 next = inode->i_ino;
242
243 for (;;) {

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260 remain = max_blocks;
261 bh_result->b_size = (remain << inode->i_blkbits);
262 goto out_brelse;
263 }
264 if (next == ~0)
265 break;
266
267 brelse(bh);
268 bh = omfs_bread(inode->i_sb, next);
268 bh = sb_bread(inode->i_sb, clus_to_blk(sbi, next));
269 if (!bh)
270 goto out;
271 oe = (struct omfs_extent *) (&bh->b_data[OMFS_EXTENT_CONT]);
272 max_extents = omfs_max_extents(sbi, OMFS_EXTENT_CONT);
273 }
274 if (create) {
275 ret = omfs_grow_extent(inode, oe, &new_block);
276 if (ret == 0) {

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307{
308 return mpage_writepages(mapping, wbc, omfs_get_block);
309}
310
311static int omfs_write_begin(struct file *file, struct address_space *mapping,
312 loff_t pos, unsigned len, unsigned flags,
313 struct page **pagep, void **fsdata)
314{
269 if (!bh)
270 goto out;
271 oe = (struct omfs_extent *) (&bh->b_data[OMFS_EXTENT_CONT]);
272 max_extents = omfs_max_extents(sbi, OMFS_EXTENT_CONT);
273 }
274 if (create) {
275 ret = omfs_grow_extent(inode, oe, &new_block);
276 if (ret == 0) {

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307{
308 return mpage_writepages(mapping, wbc, omfs_get_block);
309}
310
311static int omfs_write_begin(struct file *file, struct address_space *mapping,
312 loff_t pos, unsigned len, unsigned flags,
313 struct page **pagep, void **fsdata)
314{
315 *pagep = NULL;
316 return block_write_begin(file, mapping, pos, len, flags,
317 pagep, fsdata, omfs_get_block);
315 int ret;
316
317 ret = block_write_begin(mapping, pos, len, flags, pagep,
318 omfs_get_block);
319 if (unlikely(ret)) {
320 loff_t isize = mapping->host->i_size;
321 if (pos + len > isize)
322 vmtruncate(mapping->host, isize);
323 }
324
325 return ret;
318}
319
320static sector_t omfs_bmap(struct address_space *mapping, sector_t block)
321{
322 return generic_block_bmap(mapping, block, omfs_get_block);
323}
324
325const struct file_operations omfs_file_operations = {

--- 25 unchanged lines hidden --- 		326}
327
328static sector_t omfs_bmap(struct address_space *mapping, sector_t block)
329{
330 return generic_block_bmap(mapping, block, omfs_get_block);
331}
332
333const struct file_operations omfs_file_operations = {

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