Lines Matching refs:file
2 * fileio.c --- Simple file I/O routines
7 * This file may be redistributed under the terms of the GNU Library
41 #define BMAP_BUFFER (file->buf + fs->blocksize)
47 ext2_file_t file;
51 * Don't let caller create or open a file for writing if the
58 retval = ext2fs_get_mem(sizeof(struct ext2_file), &file);
62 memset(file, 0, sizeof(struct ext2_file));
63 file->magic = EXT2_ET_MAGIC_EXT2_FILE;
64 file->fs = fs;
65 file->ino = ino;
66 file->flags = flags & EXT2_FILE_MASK;
69 memcpy(&file->inode, inode, sizeof(struct ext2_inode));
71 retval = ext2fs_read_inode(fs, ino, &file->inode);
76 retval = ext2fs_get_array(3, fs->blocksize, &file->buf);
80 *ret = file;
84 if (file->buf)
85 ext2fs_free_mem(&file->buf);
86 ext2fs_free_mem(&file);
97 * This function returns the filesystem handle of a file from the structure
99 ext2_filsys ext2fs_file_get_fs(ext2_file_t file)
101 if (file->magic != EXT2_ET_MAGIC_EXT2_FILE)
103 return file->fs;
107 * This function returns the pointer to the inode of a file from the structure
109 struct ext2_inode *ext2fs_file_get_inode(ext2_file_t file)
111 if (file->magic != EXT2_ET_MAGIC_EXT2_FILE)
113 return &file->inode;
117 ext2_ino_t ext2fs_file_get_inode_num(ext2_file_t file)
119 if (file->magic != EXT2_ET_MAGIC_EXT2_FILE)
121 return file->ino;
128 errcode_t ext2fs_file_flush(ext2_file_t file)
135 EXT2_CHECK_MAGIC(file, EXT2_ET_MAGIC_EXT2_FILE);
136 fs = file->fs;
138 if (!(file->flags & EXT2_FILE_BUF_VALID) ||
139 !(file->flags & EXT2_FILE_BUF_DIRTY))
143 if (file->physblock && file->inode.i_flags & EXT4_EXTENTS_FL) {
144 retval = ext2fs_bmap2(fs, file->ino, &file->inode, BMAP_BUFFER,
145 0, file->blockno, &ret_flags, &dontcare);
149 retval = ext2fs_bmap2(fs, file->ino, &file->inode,
151 file->blockno, 0,
152 &file->physblock);
162 if (!file->physblock) {
163 retval = ext2fs_bmap2(fs, file->ino, &file->inode,
164 BMAP_BUFFER, file->ino ? BMAP_ALLOC : 0,
165 file->blockno, 0, &file->physblock);
170 retval = io_channel_write_blk64(fs->io, file->physblock, 1, file->buf);
174 file->flags &= ~EXT2_FILE_BUF_DIRTY;
180 * This function synchronizes the file's block buffer and the current
181 * file position, possibly invalidating block buffer if necessary
183 static errcode_t sync_buffer_position(ext2_file_t file)
188 b = file->pos / file->fs->blocksize;
189 if (b != file->blockno) {
190 retval = ext2fs_file_flush(file);
193 file->flags &= ~EXT2_FILE_BUF_VALID;
195 file->blockno = b;
200 * This function loads the file's block buffer with valid data from
205 * function basically only sets file->physblock and EXT2_FILE_BUF_VALID
208 static errcode_t load_buffer(ext2_file_t file, int dontfill)
210 ext2_filsys fs = file->fs;
214 if (!(file->flags & EXT2_FILE_BUF_VALID)) {
215 retval = ext2fs_bmap2(fs, file->ino, &file->inode,
216 BMAP_BUFFER, 0, file->blockno, &ret_flags,
217 &file->physblock);
221 if (file->physblock &&
224 file->physblock,
225 1, file->buf);
229 memset(file->buf, 0, fs->blocksize);
231 file->flags |= EXT2_FILE_BUF_VALID;
237 errcode_t ext2fs_file_close(ext2_file_t file)
241 EXT2_CHECK_MAGIC(file, EXT2_ET_MAGIC_EXT2_FILE);
243 retval = ext2fs_file_flush(file);
245 if (file->buf)
246 ext2fs_free_mem(&file->buf);
247 ext2fs_free_mem(&file);
254 ext2fs_file_read_inline_data(ext2_file_t file, void *buf,
262 fs = file->fs;
263 retval = ext2fs_inline_data_get(fs, file->ino, &file->inode,
264 file->buf, &size);
268 if (file->pos >= size)
271 count = size - file->pos;
274 memcpy(buf, file->buf + file->pos, count);
275 file->pos += count;
285 errcode_t ext2fs_file_read(ext2_file_t file, void *buf,
294 EXT2_CHECK_MAGIC(file, EXT2_ET_MAGIC_EXT2_FILE);
295 fs = file->fs;
298 if (file->inode.i_flags & EXT4_INLINE_DATA_FL)
299 return ext2fs_file_read_inline_data(file, buf, wanted, got);
301 while ((file->pos < EXT2_I_SIZE(&file->inode)) && (wanted > 0)) {
302 retval = sync_buffer_position(file);
305 retval = load_buffer(file, 0);
309 start = file->pos % fs->blocksize;
313 left = EXT2_I_SIZE(&file->inode) - file->pos ;
317 memcpy(ptr, file->buf+start, c);
318 file->pos += c;
332 ext2fs_file_write_inline_data(ext2_file_t file, const void *buf,
340 fs = file->fs;
341 retval = ext2fs_inline_data_get(fs, file->ino, &file->inode,
342 file->buf, &size);
346 if (file->pos < size) {
347 count = nbytes - file->pos;
348 memcpy(file->buf + file->pos, buf, count);
350 retval = ext2fs_inline_data_set(fs, file->ino, &file->inode,
351 file->buf, count);
357 file->pos += count;
360 if (count != 0 && EXT2_I_SIZE(&file->inode) < file->pos) {
363 rc = ext2fs_file_set_size2(file, file->pos);
374 retval = ext2fs_inline_data_expand(fs, file->ino);
380 * XXX: file->inode could be copied from the outside
384 retval = ext2fs_read_inode(fs, file->ino, &file->inode);
391 errcode_t ext2fs_file_write(ext2_file_t file, const void *buf,
401 EXT2_CHECK_MAGIC(file, EXT2_ET_MAGIC_EXT2_FILE);
402 fs = file->fs;
404 if (!(file->flags & EXT2_FILE_WRITE))
408 if (file->inode.i_flags & EXT4_INLINE_DATA_FL) {
409 retval = ext2fs_file_write_inline_data(file, buf, nbytes,
418 retval = sync_buffer_position(file);
422 start = file->pos % fs->blocksize;
431 retval = load_buffer(file, (c == fs->blocksize));
435 file->flags |= EXT2_FILE_BUF_DIRTY;
436 memcpy(file->buf+start, ptr, c);
442 if (!file->physblock) {
443 bmap_flags = (file->ino ? BMAP_ALLOC : 0);
450 ext2fs_sha512((const unsigned char*)file->buf,
459 file->physblock = old_block->physblock;
465 retval = ext2fs_bmap2(fs, file->ino, &file->inode,
468 file->blockno, 0,
469 &file->physblock);
474 new_block->physblock = file->physblock;
480 file->pos += c;
488 if (count != 0 && EXT2_I_SIZE(&file->inode) < file->pos) {
491 rc = ext2fs_file_set_size2(file, file->pos);
501 errcode_t ext2fs_file_llseek(ext2_file_t file, __u64 offset,
504 EXT2_CHECK_MAGIC(file, EXT2_ET_MAGIC_EXT2_FILE);
507 file->pos = offset;
509 file->pos += offset;
511 file->pos = EXT2_I_SIZE(&file->inode) + offset;
516 *ret_pos = file->pos;
521 errcode_t ext2fs_file_lseek(ext2_file_t file, ext2_off_t offset,
528 retval = ext2fs_file_llseek(file, loffset, whence, &ret_loffset);
536 * This function returns the size of the file, according to the inode
538 errcode_t ext2fs_file_get_lsize(ext2_file_t file, __u64 *ret_size)
540 if (file->magic != EXT2_ET_MAGIC_EXT2_FILE)
542 *ret_size = EXT2_I_SIZE(&file->inode);
547 * This function returns the size of the file, according to the inode
549 ext2_off_t ext2fs_file_get_size(ext2_file_t file)
553 if (ext2fs_file_get_lsize(file, &size))
561 static errcode_t ext2fs_file_zero_past_offset(ext2_file_t file,
564 ext2_filsys fs = file->fs;
574 retval = sync_buffer_position(file);
579 retval = ext2fs_bmap2(fs, file->ino, NULL, NULL, 0,
608 * This function sets the size of the file, truncating it if necessary
611 errcode_t ext2fs_file_set_size2(ext2_file_t file, ext2_off64_t size)
617 EXT2_CHECK_MAGIC(file, EXT2_ET_MAGIC_EXT2_FILE);
619 if (size && ext2fs_file_block_offset_too_big(file->fs, &file->inode,
620 (size - 1) / file->fs->blocksize))
622 truncate_block = ((size + file->fs->blocksize - 1) >>
623 EXT2_BLOCK_SIZE_BITS(file->fs->super));
624 old_size = EXT2_I_SIZE(&file->inode);
625 old_truncate = ((old_size + file->fs->blocksize - 1) >>
626 EXT2_BLOCK_SIZE_BITS(file->fs->super));
628 retval = ext2fs_inode_size_set(file->fs, &file->inode, size);
632 if (file->ino) {
633 retval = ext2fs_write_inode(file->fs, file->ino, &file->inode);
638 retval = ext2fs_file_zero_past_offset(file, size);
645 return ext2fs_punch(file->fs, file->ino, &file->inode, 0,
649 errcode_t ext2fs_file_set_size(ext2_file_t file, ext2_off_t size)
651 return ext2fs_file_set_size2(file, size);
