diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/bfs/file.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/bfs/file.c | 194 |
1 files changed, 0 insertions, 194 deletions
diff --git a/ANDROID_3.4.5/fs/bfs/file.c b/ANDROID_3.4.5/fs/bfs/file.c deleted file mode 100644 index f20e8a71..00000000 --- a/ANDROID_3.4.5/fs/bfs/file.c +++ /dev/null @@ -1,194 +0,0 @@ -/* - * fs/bfs/file.c - * BFS file operations. - * Copyright (C) 1999,2000 Tigran Aivazian <tigran@veritas.com> - * - * Make the file block allocation algorithm understand the size - * of the underlying block device. - * Copyright (C) 2007 Dmitri Vorobiev <dmitri.vorobiev@gmail.com> - * - */ - -#include <linux/fs.h> -#include <linux/buffer_head.h> -#include "bfs.h" - -#undef DEBUG - -#ifdef DEBUG -#define dprintf(x...) printf(x) -#else -#define dprintf(x...) -#endif - -const struct file_operations bfs_file_operations = { - .llseek = generic_file_llseek, - .read = do_sync_read, - .aio_read = generic_file_aio_read, - .write = do_sync_write, - .aio_write = generic_file_aio_write, - .mmap = generic_file_mmap, - .splice_read = generic_file_splice_read, -}; - -static int bfs_move_block(unsigned long from, unsigned long to, - struct super_block *sb) -{ - struct buffer_head *bh, *new; - - bh = sb_bread(sb, from); - if (!bh) - return -EIO; - new = sb_getblk(sb, to); - memcpy(new->b_data, bh->b_data, bh->b_size); - mark_buffer_dirty(new); - bforget(bh); - brelse(new); - return 0; -} - -static int bfs_move_blocks(struct super_block *sb, unsigned long start, - unsigned long end, unsigned long where) -{ - unsigned long i; - - dprintf("%08lx-%08lx->%08lx\n", start, end, where); - for (i = start; i <= end; i++) - if(bfs_move_block(i, where + i, sb)) { - dprintf("failed to move block %08lx -> %08lx\n", i, - where + i); - return -EIO; - } - return 0; -} - -static int bfs_get_block(struct inode *inode, sector_t block, - struct buffer_head *bh_result, int create) -{ - unsigned long phys; - int err; - struct super_block *sb = inode->i_sb; - struct bfs_sb_info *info = BFS_SB(sb); - struct bfs_inode_info *bi = BFS_I(inode); - - phys = bi->i_sblock + block; - if (!create) { - if (phys <= bi->i_eblock) { - dprintf("c=%d, b=%08lx, phys=%09lx (granted)\n", - create, (unsigned long)block, phys); - map_bh(bh_result, sb, phys); - } - return 0; - } - - /* - * If the file is not empty and the requested block is within the - * range of blocks allocated for this file, we can grant it. - */ - if (bi->i_sblock && (phys <= bi->i_eblock)) { - dprintf("c=%d, b=%08lx, phys=%08lx (interim block granted)\n", - create, (unsigned long)block, phys); - map_bh(bh_result, sb, phys); - return 0; - } - - /* The file will be extended, so let's see if there is enough space. */ - if (phys >= info->si_blocks) - return -ENOSPC; - - /* The rest has to be protected against itself. */ - mutex_lock(&info->bfs_lock); - - /* - * If the last data block for this file is the last allocated - * block, we can extend the file trivially, without moving it - * anywhere. - */ - if (bi->i_eblock == info->si_lf_eblk) { - dprintf("c=%d, b=%08lx, phys=%08lx (simple extension)\n", - create, (unsigned long)block, phys); - map_bh(bh_result, sb, phys); - info->si_freeb -= phys - bi->i_eblock; - info->si_lf_eblk = bi->i_eblock = phys; - mark_inode_dirty(inode); - err = 0; - goto out; - } - - /* Ok, we have to move this entire file to the next free block. */ - phys = info->si_lf_eblk + 1; - if (phys + block >= info->si_blocks) { - err = -ENOSPC; - goto out; - } - - if (bi->i_sblock) { - err = bfs_move_blocks(inode->i_sb, bi->i_sblock, - bi->i_eblock, phys); - if (err) { - dprintf("failed to move ino=%08lx -> fs corruption\n", - inode->i_ino); - goto out; - } - } else - err = 0; - - dprintf("c=%d, b=%08lx, phys=%08lx (moved)\n", - create, (unsigned long)block, phys); - bi->i_sblock = phys; - phys += block; - info->si_lf_eblk = bi->i_eblock = phys; - - /* - * This assumes nothing can write the inode back while we are here - * and thus update inode->i_blocks! (XXX) - */ - info->si_freeb -= bi->i_eblock - bi->i_sblock + 1 - inode->i_blocks; - mark_inode_dirty(inode); - map_bh(bh_result, sb, phys); -out: - mutex_unlock(&info->bfs_lock); - return err; -} - -static int bfs_writepage(struct page *page, struct writeback_control *wbc) -{ - return block_write_full_page(page, bfs_get_block, wbc); -} - -static int bfs_readpage(struct file *file, struct page *page) -{ - return block_read_full_page(page, bfs_get_block); -} - -static int bfs_write_begin(struct file *file, struct address_space *mapping, - loff_t pos, unsigned len, unsigned flags, - struct page **pagep, void **fsdata) -{ - int ret; - - ret = block_write_begin(mapping, pos, len, flags, pagep, - bfs_get_block); - if (unlikely(ret)) { - loff_t isize = mapping->host->i_size; - if (pos + len > isize) - vmtruncate(mapping->host, isize); - } - - return ret; -} - -static sector_t bfs_bmap(struct address_space *mapping, sector_t block) -{ - return generic_block_bmap(mapping, block, bfs_get_block); -} - -const struct address_space_operations bfs_aops = { - .readpage = bfs_readpage, - .writepage = bfs_writepage, - .write_begin = bfs_write_begin, - .write_end = generic_write_end, - .bmap = bfs_bmap, -}; - -const struct inode_operations bfs_file_inops; |