Lines Matching defs:file
2 * fileio.c --- Simple file I/O routines
7 * This file may be redistributed under the terms of the GNU Library
34 #define BMAP_BUFFER (file->buf + fs->blocksize)
40 ext2_file_t file;
44 * Don't let caller create or open a file for writing if the
51 retval = ext2fs_get_mem(sizeof(struct ext2_file), &file);
55 memset(file, 0, sizeof(struct ext2_file));
56 file->magic = EXT2_ET_MAGIC_EXT2_FILE;
57 file->fs = fs;
58 file->ino = ino;
59 file->flags = flags & EXT2_FILE_MASK;
62 memcpy(&file->inode, inode, sizeof(struct ext2_inode));
64 retval = ext2fs_read_inode(fs, ino, &file->inode);
69 retval = ext2fs_get_array(3, fs->blocksize, &file->buf);
73 *ret = file;
77 if (file->buf)
78 ext2fs_free_mem(&file->buf);
79 ext2fs_free_mem(&file);
90 * This function returns the filesystem handle of a file from the structure
92 ext2_filsys ext2fs_file_get_fs(ext2_file_t file)
94 if (file->magic != EXT2_ET_MAGIC_EXT2_FILE)
96 return file->fs;
100 * This function returns the pointer to the inode of a file from the structure
102 struct ext2_inode *ext2fs_file_get_inode(ext2_file_t file)
104 if (file->magic != EXT2_ET_MAGIC_EXT2_FILE)
106 return &file->inode;
110 ext2_ino_t ext2fs_file_get_inode_num(ext2_file_t file)
112 if (file->magic != EXT2_ET_MAGIC_EXT2_FILE)
114 return file->ino;
121 errcode_t ext2fs_file_flush(ext2_file_t file)
126 EXT2_CHECK_MAGIC(file, EXT2_ET_MAGIC_EXT2_FILE);
127 fs = file->fs;
129 if (!(file->flags & EXT2_FILE_BUF_VALID) ||
130 !(file->flags & EXT2_FILE_BUF_DIRTY))
137 if (!file->physblock) {
138 retval = ext2fs_bmap2(fs, file->ino, &file->inode,
139 BMAP_BUFFER, file->ino ? BMAP_ALLOC : 0,
140 file->blockno, 0, &file->physblock);
145 retval = io_channel_write_blk64(fs->io, file->physblock, 1, file->buf);
149 file->flags &= ~EXT2_FILE_BUF_DIRTY;
155 * This function synchronizes the file's block buffer and the current
156 * file position, possibly invalidating block buffer if necessary
158 static errcode_t sync_buffer_position(ext2_file_t file)
163 b = file->pos / file->fs->blocksize;
164 if (b != file->blockno) {
165 retval = ext2fs_file_flush(file);
168 file->flags &= ~EXT2_FILE_BUF_VALID;
170 file->blockno = b;
175 * This function loads the file's block buffer with valid data from
180 * function basically only sets file->physblock and EXT2_FILE_BUF_VALID
183 static errcode_t load_buffer(ext2_file_t file, int dontfill)
185 ext2_filsys fs = file->fs;
188 if (!(file->flags & EXT2_FILE_BUF_VALID)) {
189 retval = ext2fs_bmap2(fs, file->ino, &file->inode,
190 BMAP_BUFFER, 0, file->blockno, 0,
191 &file->physblock);
195 if (file->physblock) {
197 file->physblock,
198 1, file->buf);
202 memset(file->buf, 0, fs->blocksize);
204 file->flags |= EXT2_FILE_BUF_VALID;
210 errcode_t ext2fs_file_close(ext2_file_t file)
214 EXT2_CHECK_MAGIC(file, EXT2_ET_MAGIC_EXT2_FILE);
216 retval = ext2fs_file_flush(file);
218 if (file->buf)
219 ext2fs_free_mem(&file->buf);
220 ext2fs_free_mem(&file);
226 errcode_t ext2fs_file_read(ext2_file_t file, void *buf,
235 EXT2_CHECK_MAGIC(file, EXT2_ET_MAGIC_EXT2_FILE);
236 fs = file->fs;
238 while ((file->pos < EXT2_I_SIZE(&file->inode)) && (wanted > 0)) {
239 retval = sync_buffer_position(file);
242 retval = load_buffer(file, 0);
246 start = file->pos % fs->blocksize;
250 left = EXT2_I_SIZE(&file->inode) - file->pos ;
254 memcpy(ptr, file->buf+start, c);
255 file->pos += c;
268 errcode_t ext2fs_file_write(ext2_file_t file, const void *buf,
276 EXT2_CHECK_MAGIC(file, EXT2_ET_MAGIC_EXT2_FILE);
277 fs = file->fs;
279 if (!(file->flags & EXT2_FILE_WRITE))
283 retval = sync_buffer_position(file);
287 start = file->pos % fs->blocksize;
296 retval = load_buffer(file, (c == fs->blocksize));
304 if (!file->physblock) {
305 retval = ext2fs_bmap2(fs, file->ino, &file->inode,
307 file->ino ? BMAP_ALLOC : 0,
308 file->blockno, 0,
309 &file->physblock);
314 file->flags |= EXT2_FILE_BUF_DIRTY;
315 memcpy(file->buf+start, ptr, c);
316 file->pos += c;
324 if (count != 0 && EXT2_I_SIZE(&file->inode) < file->pos) {
327 rc = ext2fs_file_set_size2(file, file->pos);
337 errcode_t ext2fs_file_llseek(ext2_file_t file, __u64 offset,
340 EXT2_CHECK_MAGIC(file, EXT2_ET_MAGIC_EXT2_FILE);
343 file->pos = offset;
345 file->pos += offset;
347 file->pos = EXT2_I_SIZE(&file->inode) + offset;
352 *ret_pos = file->pos;
357 errcode_t ext2fs_file_lseek(ext2_file_t file, ext2_off_t offset,
364 retval = ext2fs_file_llseek(file, loffset, whence, &ret_loffset);
372 * This function returns the size of the file, according to the inode
374 errcode_t ext2fs_file_get_lsize(ext2_file_t file, __u64 *ret_size)
376 if (file->magic != EXT2_ET_MAGIC_EXT2_FILE)
378 *ret_size = EXT2_I_SIZE(&file->inode);
383 * This function returns the size of the file, according to the inode
385 ext2_off_t ext2fs_file_get_size(ext2_file_t file)
389 if (ext2fs_file_get_lsize(file, &size))
397 static errcode_t ext2fs_file_zero_past_offset(ext2_file_t file,
400 ext2_filsys fs = file->fs;
410 retval = sync_buffer_position(file);
415 retval = ext2fs_bmap2(fs, file->ino, NULL, NULL, 0,
444 * This function sets the size of the file, truncating it if necessary
447 errcode_t ext2fs_file_set_size2(ext2_file_t file, ext2_off64_t size)
453 EXT2_CHECK_MAGIC(file, EXT2_ET_MAGIC_EXT2_FILE);
455 if (size && ext2fs_file_block_offset_too_big(file->fs, &file->inode,
456 (size - 1) / file->fs->blocksize))
458 truncate_block = ((size + file->fs->blocksize - 1) >>
459 EXT2_BLOCK_SIZE_BITS(file->fs->super));
460 old_size = EXT2_I_SIZE(&file->inode);
461 old_truncate = ((old_size + file->fs->blocksize - 1) >>
462 EXT2_BLOCK_SIZE_BITS(file->fs->super));
464 /* If we're writing a large file, set the large_file flag */
465 if (LINUX_S_ISREG(file->inode.i_mode) &&
466 ext2fs_needs_large_file_feature(EXT2_I_SIZE(&file->inode)) &&
467 (!EXT2_HAS_RO_COMPAT_FEATURE(file->fs->super,
469 file->fs->super->s_rev_level == EXT2_GOOD_OLD_REV)) {
470 file->fs->super->s_feature_ro_compat |=
472 ext2fs_update_dynamic_rev(file->fs);
473 ext2fs_mark_super_dirty(file->fs);
476 file->inode.i_size = size & 0xffffffff;
477 file->inode.i_size_high = (size >> 32);
478 if (file->ino) {
479 retval = ext2fs_write_inode(file->fs, file->ino, &file->inode);
484 retval = ext2fs_file_zero_past_offset(file, size);
491 return ext2fs_punch(file->fs, file->ino, &file->inode, 0,
495 errcode_t ext2fs_file_set_size(ext2_file_t file, ext2_off_t size)
497 return ext2fs_file_set_size2(file, size);
