Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
920
fs/affs/file.c
Normal file
920
fs/affs/file.c
Normal file
@@ -0,0 +1,920 @@
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/*
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* linux/fs/affs/file.c
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*
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* (c) 1996 Hans-Joachim Widmaier - Rewritten
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*
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* (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
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*
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* (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
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*
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* (C) 1991 Linus Torvalds - minix filesystem
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*
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* affs regular file handling primitives
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*/
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#include "affs.h"
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#if PAGE_SIZE < 4096
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#error PAGE_SIZE must be at least 4096
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#endif
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static int affs_grow_extcache(struct inode *inode, u32 lc_idx);
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static struct buffer_head *affs_alloc_extblock(struct inode *inode, struct buffer_head *bh, u32 ext);
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static inline struct buffer_head *affs_get_extblock(struct inode *inode, u32 ext);
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static struct buffer_head *affs_get_extblock_slow(struct inode *inode, u32 ext);
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static ssize_t affs_file_write(struct file *filp, const char __user *buf, size_t count, loff_t *ppos);
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static int affs_file_open(struct inode *inode, struct file *filp);
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static int affs_file_release(struct inode *inode, struct file *filp);
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struct file_operations affs_file_operations = {
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.llseek = generic_file_llseek,
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.read = generic_file_read,
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.write = affs_file_write,
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.mmap = generic_file_mmap,
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.open = affs_file_open,
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.release = affs_file_release,
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.fsync = file_fsync,
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.sendfile = generic_file_sendfile,
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};
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struct inode_operations affs_file_inode_operations = {
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.truncate = affs_truncate,
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.setattr = affs_notify_change,
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};
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static int
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affs_file_open(struct inode *inode, struct file *filp)
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{
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if (atomic_read(&filp->f_count) != 1)
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return 0;
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pr_debug("AFFS: open(%d)\n", AFFS_I(inode)->i_opencnt);
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AFFS_I(inode)->i_opencnt++;
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return 0;
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}
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static int
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affs_file_release(struct inode *inode, struct file *filp)
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{
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if (atomic_read(&filp->f_count) != 0)
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return 0;
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pr_debug("AFFS: release(%d)\n", AFFS_I(inode)->i_opencnt);
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AFFS_I(inode)->i_opencnt--;
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if (!AFFS_I(inode)->i_opencnt)
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affs_free_prealloc(inode);
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return 0;
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}
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static int
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affs_grow_extcache(struct inode *inode, u32 lc_idx)
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{
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struct super_block *sb = inode->i_sb;
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struct buffer_head *bh;
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u32 lc_max;
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int i, j, key;
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if (!AFFS_I(inode)->i_lc) {
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char *ptr = (char *)get_zeroed_page(GFP_NOFS);
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if (!ptr)
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return -ENOMEM;
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AFFS_I(inode)->i_lc = (u32 *)ptr;
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AFFS_I(inode)->i_ac = (struct affs_ext_key *)(ptr + AFFS_CACHE_SIZE / 2);
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}
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lc_max = AFFS_LC_SIZE << AFFS_I(inode)->i_lc_shift;
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if (AFFS_I(inode)->i_extcnt > lc_max) {
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u32 lc_shift, lc_mask, tmp, off;
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/* need to recalculate linear cache, start from old size */
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lc_shift = AFFS_I(inode)->i_lc_shift;
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tmp = (AFFS_I(inode)->i_extcnt / AFFS_LC_SIZE) >> lc_shift;
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for (; tmp; tmp >>= 1)
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lc_shift++;
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lc_mask = (1 << lc_shift) - 1;
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/* fix idx and old size to new shift */
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lc_idx >>= (lc_shift - AFFS_I(inode)->i_lc_shift);
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AFFS_I(inode)->i_lc_size >>= (lc_shift - AFFS_I(inode)->i_lc_shift);
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/* first shrink old cache to make more space */
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off = 1 << (lc_shift - AFFS_I(inode)->i_lc_shift);
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for (i = 1, j = off; j < AFFS_LC_SIZE; i++, j += off)
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AFFS_I(inode)->i_ac[i] = AFFS_I(inode)->i_ac[j];
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AFFS_I(inode)->i_lc_shift = lc_shift;
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AFFS_I(inode)->i_lc_mask = lc_mask;
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}
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/* fill cache to the needed index */
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i = AFFS_I(inode)->i_lc_size;
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AFFS_I(inode)->i_lc_size = lc_idx + 1;
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for (; i <= lc_idx; i++) {
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if (!i) {
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AFFS_I(inode)->i_lc[0] = inode->i_ino;
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continue;
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}
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key = AFFS_I(inode)->i_lc[i - 1];
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j = AFFS_I(inode)->i_lc_mask + 1;
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// unlock cache
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for (; j > 0; j--) {
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bh = affs_bread(sb, key);
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if (!bh)
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goto err;
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key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
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affs_brelse(bh);
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}
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// lock cache
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AFFS_I(inode)->i_lc[i] = key;
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}
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return 0;
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err:
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// lock cache
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return -EIO;
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}
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static struct buffer_head *
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affs_alloc_extblock(struct inode *inode, struct buffer_head *bh, u32 ext)
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{
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struct super_block *sb = inode->i_sb;
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struct buffer_head *new_bh;
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u32 blocknr, tmp;
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blocknr = affs_alloc_block(inode, bh->b_blocknr);
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if (!blocknr)
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return ERR_PTR(-ENOSPC);
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new_bh = affs_getzeroblk(sb, blocknr);
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if (!new_bh) {
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affs_free_block(sb, blocknr);
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return ERR_PTR(-EIO);
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}
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AFFS_HEAD(new_bh)->ptype = cpu_to_be32(T_LIST);
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AFFS_HEAD(new_bh)->key = cpu_to_be32(blocknr);
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AFFS_TAIL(sb, new_bh)->stype = cpu_to_be32(ST_FILE);
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AFFS_TAIL(sb, new_bh)->parent = cpu_to_be32(inode->i_ino);
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affs_fix_checksum(sb, new_bh);
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mark_buffer_dirty_inode(new_bh, inode);
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tmp = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
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if (tmp)
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affs_warning(sb, "alloc_ext", "previous extension set (%x)", tmp);
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AFFS_TAIL(sb, bh)->extension = cpu_to_be32(blocknr);
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affs_adjust_checksum(bh, blocknr - tmp);
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mark_buffer_dirty_inode(bh, inode);
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AFFS_I(inode)->i_extcnt++;
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mark_inode_dirty(inode);
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return new_bh;
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}
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static inline struct buffer_head *
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affs_get_extblock(struct inode *inode, u32 ext)
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{
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/* inline the simplest case: same extended block as last time */
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struct buffer_head *bh = AFFS_I(inode)->i_ext_bh;
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if (ext == AFFS_I(inode)->i_ext_last)
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atomic_inc(&bh->b_count);
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else
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/* we have to do more (not inlined) */
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bh = affs_get_extblock_slow(inode, ext);
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return bh;
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}
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static struct buffer_head *
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affs_get_extblock_slow(struct inode *inode, u32 ext)
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{
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struct super_block *sb = inode->i_sb;
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struct buffer_head *bh;
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u32 ext_key;
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u32 lc_idx, lc_off, ac_idx;
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u32 tmp, idx;
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if (ext == AFFS_I(inode)->i_ext_last + 1) {
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/* read the next extended block from the current one */
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bh = AFFS_I(inode)->i_ext_bh;
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ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
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if (ext < AFFS_I(inode)->i_extcnt)
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goto read_ext;
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if (ext > AFFS_I(inode)->i_extcnt)
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BUG();
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bh = affs_alloc_extblock(inode, bh, ext);
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if (IS_ERR(bh))
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return bh;
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goto store_ext;
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}
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if (ext == 0) {
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/* we seek back to the file header block */
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ext_key = inode->i_ino;
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goto read_ext;
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}
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if (ext >= AFFS_I(inode)->i_extcnt) {
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struct buffer_head *prev_bh;
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/* allocate a new extended block */
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if (ext > AFFS_I(inode)->i_extcnt)
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BUG();
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/* get previous extended block */
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prev_bh = affs_get_extblock(inode, ext - 1);
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if (IS_ERR(prev_bh))
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return prev_bh;
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bh = affs_alloc_extblock(inode, prev_bh, ext);
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affs_brelse(prev_bh);
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if (IS_ERR(bh))
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return bh;
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goto store_ext;
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}
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again:
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/* check if there is an extended cache and whether it's large enough */
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lc_idx = ext >> AFFS_I(inode)->i_lc_shift;
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lc_off = ext & AFFS_I(inode)->i_lc_mask;
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if (lc_idx >= AFFS_I(inode)->i_lc_size) {
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int err;
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err = affs_grow_extcache(inode, lc_idx);
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if (err)
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return ERR_PTR(err);
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goto again;
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}
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/* every n'th key we find in the linear cache */
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if (!lc_off) {
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ext_key = AFFS_I(inode)->i_lc[lc_idx];
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goto read_ext;
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}
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/* maybe it's still in the associative cache */
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ac_idx = (ext - lc_idx - 1) & AFFS_AC_MASK;
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if (AFFS_I(inode)->i_ac[ac_idx].ext == ext) {
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ext_key = AFFS_I(inode)->i_ac[ac_idx].key;
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goto read_ext;
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}
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/* try to find one of the previous extended blocks */
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tmp = ext;
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idx = ac_idx;
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while (--tmp, --lc_off > 0) {
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idx = (idx - 1) & AFFS_AC_MASK;
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if (AFFS_I(inode)->i_ac[idx].ext == tmp) {
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ext_key = AFFS_I(inode)->i_ac[idx].key;
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goto find_ext;
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}
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}
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/* fall back to the linear cache */
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ext_key = AFFS_I(inode)->i_lc[lc_idx];
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find_ext:
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/* read all extended blocks until we find the one we need */
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//unlock cache
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do {
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bh = affs_bread(sb, ext_key);
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if (!bh)
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goto err_bread;
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ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension);
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affs_brelse(bh);
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tmp++;
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} while (tmp < ext);
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//lock cache
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||||
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||||
/* store it in the associative cache */
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||||
// recalculate ac_idx?
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AFFS_I(inode)->i_ac[ac_idx].ext = ext;
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AFFS_I(inode)->i_ac[ac_idx].key = ext_key;
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||||
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read_ext:
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||||
/* finally read the right extended block */
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//unlock cache
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bh = affs_bread(sb, ext_key);
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if (!bh)
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goto err_bread;
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//lock cache
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||||
|
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store_ext:
|
||||
/* release old cached extended block and store the new one */
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||||
affs_brelse(AFFS_I(inode)->i_ext_bh);
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AFFS_I(inode)->i_ext_last = ext;
|
||||
AFFS_I(inode)->i_ext_bh = bh;
|
||||
atomic_inc(&bh->b_count);
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||||
|
||||
return bh;
|
||||
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||||
err_bread:
|
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affs_brelse(bh);
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||||
return ERR_PTR(-EIO);
|
||||
}
|
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|
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static int
|
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affs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh_result, int create)
|
||||
{
|
||||
struct super_block *sb = inode->i_sb;
|
||||
struct buffer_head *ext_bh;
|
||||
u32 ext;
|
||||
|
||||
pr_debug("AFFS: get_block(%u, %lu)\n", (u32)inode->i_ino, (unsigned long)block);
|
||||
|
||||
|
||||
if (block > (sector_t)0x7fffffffUL)
|
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BUG();
|
||||
|
||||
if (block >= AFFS_I(inode)->i_blkcnt) {
|
||||
if (block > AFFS_I(inode)->i_blkcnt || !create)
|
||||
goto err_big;
|
||||
} else
|
||||
create = 0;
|
||||
|
||||
//lock cache
|
||||
affs_lock_ext(inode);
|
||||
|
||||
ext = (u32)block / AFFS_SB(sb)->s_hashsize;
|
||||
block -= ext * AFFS_SB(sb)->s_hashsize;
|
||||
ext_bh = affs_get_extblock(inode, ext);
|
||||
if (IS_ERR(ext_bh))
|
||||
goto err_ext;
|
||||
map_bh(bh_result, sb, (sector_t)be32_to_cpu(AFFS_BLOCK(sb, ext_bh, block)));
|
||||
|
||||
if (create) {
|
||||
u32 blocknr = affs_alloc_block(inode, ext_bh->b_blocknr);
|
||||
if (!blocknr)
|
||||
goto err_alloc;
|
||||
set_buffer_new(bh_result);
|
||||
AFFS_I(inode)->mmu_private += AFFS_SB(sb)->s_data_blksize;
|
||||
AFFS_I(inode)->i_blkcnt++;
|
||||
|
||||
/* store new block */
|
||||
if (bh_result->b_blocknr)
|
||||
affs_warning(sb, "get_block", "block already set (%x)", bh_result->b_blocknr);
|
||||
AFFS_BLOCK(sb, ext_bh, block) = cpu_to_be32(blocknr);
|
||||
AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(block + 1);
|
||||
affs_adjust_checksum(ext_bh, blocknr - bh_result->b_blocknr + 1);
|
||||
bh_result->b_blocknr = blocknr;
|
||||
|
||||
if (!block) {
|
||||
/* insert first block into header block */
|
||||
u32 tmp = be32_to_cpu(AFFS_HEAD(ext_bh)->first_data);
|
||||
if (tmp)
|
||||
affs_warning(sb, "get_block", "first block already set (%d)", tmp);
|
||||
AFFS_HEAD(ext_bh)->first_data = cpu_to_be32(blocknr);
|
||||
affs_adjust_checksum(ext_bh, blocknr - tmp);
|
||||
}
|
||||
}
|
||||
|
||||
affs_brelse(ext_bh);
|
||||
//unlock cache
|
||||
affs_unlock_ext(inode);
|
||||
return 0;
|
||||
|
||||
err_big:
|
||||
affs_error(inode->i_sb,"get_block","strange block request %d", block);
|
||||
return -EIO;
|
||||
err_ext:
|
||||
// unlock cache
|
||||
affs_unlock_ext(inode);
|
||||
return PTR_ERR(ext_bh);
|
||||
err_alloc:
|
||||
brelse(ext_bh);
|
||||
clear_buffer_mapped(bh_result);
|
||||
bh_result->b_bdev = NULL;
|
||||
// unlock cache
|
||||
affs_unlock_ext(inode);
|
||||
return -ENOSPC;
|
||||
}
|
||||
|
||||
static int affs_writepage(struct page *page, struct writeback_control *wbc)
|
||||
{
|
||||
return block_write_full_page(page, affs_get_block, wbc);
|
||||
}
|
||||
static int affs_readpage(struct file *file, struct page *page)
|
||||
{
|
||||
return block_read_full_page(page, affs_get_block);
|
||||
}
|
||||
static int affs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
|
||||
{
|
||||
return cont_prepare_write(page, from, to, affs_get_block,
|
||||
&AFFS_I(page->mapping->host)->mmu_private);
|
||||
}
|
||||
static sector_t _affs_bmap(struct address_space *mapping, sector_t block)
|
||||
{
|
||||
return generic_block_bmap(mapping,block,affs_get_block);
|
||||
}
|
||||
struct address_space_operations affs_aops = {
|
||||
.readpage = affs_readpage,
|
||||
.writepage = affs_writepage,
|
||||
.sync_page = block_sync_page,
|
||||
.prepare_write = affs_prepare_write,
|
||||
.commit_write = generic_commit_write,
|
||||
.bmap = _affs_bmap
|
||||
};
|
||||
|
||||
static inline struct buffer_head *
|
||||
affs_bread_ino(struct inode *inode, int block, int create)
|
||||
{
|
||||
struct buffer_head *bh, tmp_bh;
|
||||
int err;
|
||||
|
||||
tmp_bh.b_state = 0;
|
||||
err = affs_get_block(inode, block, &tmp_bh, create);
|
||||
if (!err) {
|
||||
bh = affs_bread(inode->i_sb, tmp_bh.b_blocknr);
|
||||
if (bh) {
|
||||
bh->b_state |= tmp_bh.b_state;
|
||||
return bh;
|
||||
}
|
||||
err = -EIO;
|
||||
}
|
||||
return ERR_PTR(err);
|
||||
}
|
||||
|
||||
static inline struct buffer_head *
|
||||
affs_getzeroblk_ino(struct inode *inode, int block)
|
||||
{
|
||||
struct buffer_head *bh, tmp_bh;
|
||||
int err;
|
||||
|
||||
tmp_bh.b_state = 0;
|
||||
err = affs_get_block(inode, block, &tmp_bh, 1);
|
||||
if (!err) {
|
||||
bh = affs_getzeroblk(inode->i_sb, tmp_bh.b_blocknr);
|
||||
if (bh) {
|
||||
bh->b_state |= tmp_bh.b_state;
|
||||
return bh;
|
||||
}
|
||||
err = -EIO;
|
||||
}
|
||||
return ERR_PTR(err);
|
||||
}
|
||||
|
||||
static inline struct buffer_head *
|
||||
affs_getemptyblk_ino(struct inode *inode, int block)
|
||||
{
|
||||
struct buffer_head *bh, tmp_bh;
|
||||
int err;
|
||||
|
||||
tmp_bh.b_state = 0;
|
||||
err = affs_get_block(inode, block, &tmp_bh, 1);
|
||||
if (!err) {
|
||||
bh = affs_getemptyblk(inode->i_sb, tmp_bh.b_blocknr);
|
||||
if (bh) {
|
||||
bh->b_state |= tmp_bh.b_state;
|
||||
return bh;
|
||||
}
|
||||
err = -EIO;
|
||||
}
|
||||
return ERR_PTR(err);
|
||||
}
|
||||
|
||||
static ssize_t
|
||||
affs_file_write(struct file *file, const char __user *buf,
|
||||
size_t count, loff_t *ppos)
|
||||
{
|
||||
ssize_t retval;
|
||||
|
||||
retval = generic_file_write (file, buf, count, ppos);
|
||||
if (retval >0) {
|
||||
struct inode *inode = file->f_dentry->d_inode;
|
||||
inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
|
||||
mark_inode_dirty(inode);
|
||||
}
|
||||
return retval;
|
||||
}
|
||||
|
||||
static int
|
||||
affs_do_readpage_ofs(struct file *file, struct page *page, unsigned from, unsigned to)
|
||||
{
|
||||
struct inode *inode = page->mapping->host;
|
||||
struct super_block *sb = inode->i_sb;
|
||||
struct buffer_head *bh;
|
||||
char *data;
|
||||
u32 bidx, boff, bsize;
|
||||
u32 tmp;
|
||||
|
||||
pr_debug("AFFS: read_page(%u, %ld, %d, %d)\n", (u32)inode->i_ino, page->index, from, to);
|
||||
if (from > to || to > PAGE_CACHE_SIZE)
|
||||
BUG();
|
||||
kmap(page);
|
||||
data = page_address(page);
|
||||
bsize = AFFS_SB(sb)->s_data_blksize;
|
||||
tmp = (page->index << PAGE_CACHE_SHIFT) + from;
|
||||
bidx = tmp / bsize;
|
||||
boff = tmp % bsize;
|
||||
|
||||
while (from < to) {
|
||||
bh = affs_bread_ino(inode, bidx, 0);
|
||||
if (IS_ERR(bh))
|
||||
return PTR_ERR(bh);
|
||||
tmp = min(bsize - boff, to - from);
|
||||
if (from + tmp > to || tmp > bsize)
|
||||
BUG();
|
||||
memcpy(data + from, AFFS_DATA(bh) + boff, tmp);
|
||||
affs_brelse(bh);
|
||||
bidx++;
|
||||
from += tmp;
|
||||
boff = 0;
|
||||
}
|
||||
flush_dcache_page(page);
|
||||
kunmap(page);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
affs_extent_file_ofs(struct inode *inode, u32 newsize)
|
||||
{
|
||||
struct super_block *sb = inode->i_sb;
|
||||
struct buffer_head *bh, *prev_bh;
|
||||
u32 bidx, boff;
|
||||
u32 size, bsize;
|
||||
u32 tmp;
|
||||
|
||||
pr_debug("AFFS: extent_file(%u, %d)\n", (u32)inode->i_ino, newsize);
|
||||
bsize = AFFS_SB(sb)->s_data_blksize;
|
||||
bh = NULL;
|
||||
size = AFFS_I(inode)->mmu_private;
|
||||
bidx = size / bsize;
|
||||
boff = size % bsize;
|
||||
if (boff) {
|
||||
bh = affs_bread_ino(inode, bidx, 0);
|
||||
if (IS_ERR(bh))
|
||||
return PTR_ERR(bh);
|
||||
tmp = min(bsize - boff, newsize - size);
|
||||
if (boff + tmp > bsize || tmp > bsize)
|
||||
BUG();
|
||||
memset(AFFS_DATA(bh) + boff, 0, tmp);
|
||||
AFFS_DATA_HEAD(bh)->size = cpu_to_be32(be32_to_cpu(AFFS_DATA_HEAD(bh)->size) + tmp);
|
||||
affs_fix_checksum(sb, bh);
|
||||
mark_buffer_dirty_inode(bh, inode);
|
||||
size += tmp;
|
||||
bidx++;
|
||||
} else if (bidx) {
|
||||
bh = affs_bread_ino(inode, bidx - 1, 0);
|
||||
if (IS_ERR(bh))
|
||||
return PTR_ERR(bh);
|
||||
}
|
||||
|
||||
while (size < newsize) {
|
||||
prev_bh = bh;
|
||||
bh = affs_getzeroblk_ino(inode, bidx);
|
||||
if (IS_ERR(bh))
|
||||
goto out;
|
||||
tmp = min(bsize, newsize - size);
|
||||
if (tmp > bsize)
|
||||
BUG();
|
||||
AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
|
||||
AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
|
||||
AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
|
||||
AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
|
||||
affs_fix_checksum(sb, bh);
|
||||
bh->b_state &= ~(1UL << BH_New);
|
||||
mark_buffer_dirty_inode(bh, inode);
|
||||
if (prev_bh) {
|
||||
u32 tmp = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
|
||||
if (tmp)
|
||||
affs_warning(sb, "extent_file_ofs", "next block already set for %d (%d)", bidx, tmp);
|
||||
AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
|
||||
affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp);
|
||||
mark_buffer_dirty_inode(prev_bh, inode);
|
||||
affs_brelse(prev_bh);
|
||||
}
|
||||
size += bsize;
|
||||
bidx++;
|
||||
}
|
||||
affs_brelse(bh);
|
||||
inode->i_size = AFFS_I(inode)->mmu_private = newsize;
|
||||
return 0;
|
||||
|
||||
out:
|
||||
inode->i_size = AFFS_I(inode)->mmu_private = newsize;
|
||||
return PTR_ERR(bh);
|
||||
}
|
||||
|
||||
static int
|
||||
affs_readpage_ofs(struct file *file, struct page *page)
|
||||
{
|
||||
struct inode *inode = page->mapping->host;
|
||||
u32 to;
|
||||
int err;
|
||||
|
||||
pr_debug("AFFS: read_page(%u, %ld)\n", (u32)inode->i_ino, page->index);
|
||||
to = PAGE_CACHE_SIZE;
|
||||
if (((page->index + 1) << PAGE_CACHE_SHIFT) > inode->i_size) {
|
||||
to = inode->i_size & ~PAGE_CACHE_MASK;
|
||||
memset(page_address(page) + to, 0, PAGE_CACHE_SIZE - to);
|
||||
}
|
||||
|
||||
err = affs_do_readpage_ofs(file, page, 0, to);
|
||||
if (!err)
|
||||
SetPageUptodate(page);
|
||||
unlock_page(page);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int affs_prepare_write_ofs(struct file *file, struct page *page, unsigned from, unsigned to)
|
||||
{
|
||||
struct inode *inode = page->mapping->host;
|
||||
u32 size, offset;
|
||||
u32 tmp;
|
||||
int err = 0;
|
||||
|
||||
pr_debug("AFFS: prepare_write(%u, %ld, %d, %d)\n", (u32)inode->i_ino, page->index, from, to);
|
||||
offset = page->index << PAGE_CACHE_SHIFT;
|
||||
if (offset + from > AFFS_I(inode)->mmu_private) {
|
||||
err = affs_extent_file_ofs(inode, offset + from);
|
||||
if (err)
|
||||
return err;
|
||||
}
|
||||
size = inode->i_size;
|
||||
|
||||
if (PageUptodate(page))
|
||||
return 0;
|
||||
|
||||
if (from) {
|
||||
err = affs_do_readpage_ofs(file, page, 0, from);
|
||||
if (err)
|
||||
return err;
|
||||
}
|
||||
if (to < PAGE_CACHE_SIZE) {
|
||||
char *kaddr = kmap_atomic(page, KM_USER0);
|
||||
|
||||
memset(kaddr + to, 0, PAGE_CACHE_SIZE - to);
|
||||
flush_dcache_page(page);
|
||||
kunmap_atomic(kaddr, KM_USER0);
|
||||
if (size > offset + to) {
|
||||
if (size < offset + PAGE_CACHE_SIZE)
|
||||
tmp = size & ~PAGE_CACHE_MASK;
|
||||
else
|
||||
tmp = PAGE_CACHE_SIZE;
|
||||
err = affs_do_readpage_ofs(file, page, to, tmp);
|
||||
}
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
static int affs_commit_write_ofs(struct file *file, struct page *page, unsigned from, unsigned to)
|
||||
{
|
||||
struct inode *inode = page->mapping->host;
|
||||
struct super_block *sb = inode->i_sb;
|
||||
struct buffer_head *bh, *prev_bh;
|
||||
char *data;
|
||||
u32 bidx, boff, bsize;
|
||||
u32 tmp;
|
||||
int written;
|
||||
|
||||
pr_debug("AFFS: commit_write(%u, %ld, %d, %d)\n", (u32)inode->i_ino, page->index, from, to);
|
||||
bsize = AFFS_SB(sb)->s_data_blksize;
|
||||
data = page_address(page);
|
||||
|
||||
bh = NULL;
|
||||
written = 0;
|
||||
tmp = (page->index << PAGE_CACHE_SHIFT) + from;
|
||||
bidx = tmp / bsize;
|
||||
boff = tmp % bsize;
|
||||
if (boff) {
|
||||
bh = affs_bread_ino(inode, bidx, 0);
|
||||
if (IS_ERR(bh))
|
||||
return PTR_ERR(bh);
|
||||
tmp = min(bsize - boff, to - from);
|
||||
if (boff + tmp > bsize || tmp > bsize)
|
||||
BUG();
|
||||
memcpy(AFFS_DATA(bh) + boff, data + from, tmp);
|
||||
AFFS_DATA_HEAD(bh)->size = cpu_to_be32(be32_to_cpu(AFFS_DATA_HEAD(bh)->size) + tmp);
|
||||
affs_fix_checksum(sb, bh);
|
||||
mark_buffer_dirty_inode(bh, inode);
|
||||
written += tmp;
|
||||
from += tmp;
|
||||
bidx++;
|
||||
} else if (bidx) {
|
||||
bh = affs_bread_ino(inode, bidx - 1, 0);
|
||||
if (IS_ERR(bh))
|
||||
return PTR_ERR(bh);
|
||||
}
|
||||
while (from + bsize <= to) {
|
||||
prev_bh = bh;
|
||||
bh = affs_getemptyblk_ino(inode, bidx);
|
||||
if (IS_ERR(bh))
|
||||
goto out;
|
||||
memcpy(AFFS_DATA(bh), data + from, bsize);
|
||||
if (buffer_new(bh)) {
|
||||
AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
|
||||
AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
|
||||
AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
|
||||
AFFS_DATA_HEAD(bh)->size = cpu_to_be32(bsize);
|
||||
AFFS_DATA_HEAD(bh)->next = 0;
|
||||
bh->b_state &= ~(1UL << BH_New);
|
||||
if (prev_bh) {
|
||||
u32 tmp = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
|
||||
if (tmp)
|
||||
affs_warning(sb, "commit_write_ofs", "next block already set for %d (%d)", bidx, tmp);
|
||||
AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
|
||||
affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp);
|
||||
mark_buffer_dirty_inode(prev_bh, inode);
|
||||
}
|
||||
}
|
||||
affs_brelse(prev_bh);
|
||||
affs_fix_checksum(sb, bh);
|
||||
mark_buffer_dirty_inode(bh, inode);
|
||||
written += bsize;
|
||||
from += bsize;
|
||||
bidx++;
|
||||
}
|
||||
if (from < to) {
|
||||
prev_bh = bh;
|
||||
bh = affs_bread_ino(inode, bidx, 1);
|
||||
if (IS_ERR(bh))
|
||||
goto out;
|
||||
tmp = min(bsize, to - from);
|
||||
if (tmp > bsize)
|
||||
BUG();
|
||||
memcpy(AFFS_DATA(bh), data + from, tmp);
|
||||
if (buffer_new(bh)) {
|
||||
AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
|
||||
AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino);
|
||||
AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx);
|
||||
AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
|
||||
AFFS_DATA_HEAD(bh)->next = 0;
|
||||
bh->b_state &= ~(1UL << BH_New);
|
||||
if (prev_bh) {
|
||||
u32 tmp = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next);
|
||||
if (tmp)
|
||||
affs_warning(sb, "commit_write_ofs", "next block already set for %d (%d)", bidx, tmp);
|
||||
AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr);
|
||||
affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp);
|
||||
mark_buffer_dirty_inode(prev_bh, inode);
|
||||
}
|
||||
} else if (be32_to_cpu(AFFS_DATA_HEAD(bh)->size) < tmp)
|
||||
AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp);
|
||||
affs_brelse(prev_bh);
|
||||
affs_fix_checksum(sb, bh);
|
||||
mark_buffer_dirty_inode(bh, inode);
|
||||
written += tmp;
|
||||
from += tmp;
|
||||
bidx++;
|
||||
}
|
||||
SetPageUptodate(page);
|
||||
|
||||
done:
|
||||
affs_brelse(bh);
|
||||
tmp = (page->index << PAGE_CACHE_SHIFT) + from;
|
||||
if (tmp > inode->i_size)
|
||||
inode->i_size = AFFS_I(inode)->mmu_private = tmp;
|
||||
|
||||
return written;
|
||||
|
||||
out:
|
||||
bh = prev_bh;
|
||||
if (!written)
|
||||
written = PTR_ERR(bh);
|
||||
goto done;
|
||||
}
|
||||
|
||||
struct address_space_operations affs_aops_ofs = {
|
||||
.readpage = affs_readpage_ofs,
|
||||
//.writepage = affs_writepage_ofs,
|
||||
//.sync_page = affs_sync_page_ofs,
|
||||
.prepare_write = affs_prepare_write_ofs,
|
||||
.commit_write = affs_commit_write_ofs
|
||||
};
|
||||
|
||||
/* Free any preallocated blocks. */
|
||||
|
||||
void
|
||||
affs_free_prealloc(struct inode *inode)
|
||||
{
|
||||
struct super_block *sb = inode->i_sb;
|
||||
|
||||
pr_debug("AFFS: free_prealloc(ino=%lu)\n", inode->i_ino);
|
||||
|
||||
while (AFFS_I(inode)->i_pa_cnt) {
|
||||
AFFS_I(inode)->i_pa_cnt--;
|
||||
affs_free_block(sb, ++AFFS_I(inode)->i_lastalloc);
|
||||
}
|
||||
}
|
||||
|
||||
/* Truncate (or enlarge) a file to the requested size. */
|
||||
|
||||
void
|
||||
affs_truncate(struct inode *inode)
|
||||
{
|
||||
struct super_block *sb = inode->i_sb;
|
||||
u32 ext, ext_key;
|
||||
u32 last_blk, blkcnt, blk;
|
||||
u32 size;
|
||||
struct buffer_head *ext_bh;
|
||||
int i;
|
||||
|
||||
pr_debug("AFFS: truncate(inode=%d, oldsize=%u, newsize=%u)\n",
|
||||
(u32)inode->i_ino, (u32)AFFS_I(inode)->mmu_private, (u32)inode->i_size);
|
||||
|
||||
last_blk = 0;
|
||||
ext = 0;
|
||||
if (inode->i_size) {
|
||||
last_blk = ((u32)inode->i_size - 1) / AFFS_SB(sb)->s_data_blksize;
|
||||
ext = last_blk / AFFS_SB(sb)->s_hashsize;
|
||||
}
|
||||
|
||||
if (inode->i_size > AFFS_I(inode)->mmu_private) {
|
||||
struct address_space *mapping = inode->i_mapping;
|
||||
struct page *page;
|
||||
u32 size = inode->i_size - 1;
|
||||
int res;
|
||||
|
||||
page = grab_cache_page(mapping, size >> PAGE_CACHE_SHIFT);
|
||||
if (!page)
|
||||
return;
|
||||
size = (size & (PAGE_CACHE_SIZE - 1)) + 1;
|
||||
res = mapping->a_ops->prepare_write(NULL, page, size, size);
|
||||
if (!res)
|
||||
res = mapping->a_ops->commit_write(NULL, page, size, size);
|
||||
unlock_page(page);
|
||||
page_cache_release(page);
|
||||
mark_inode_dirty(inode);
|
||||
return;
|
||||
} else if (inode->i_size == AFFS_I(inode)->mmu_private)
|
||||
return;
|
||||
|
||||
// lock cache
|
||||
ext_bh = affs_get_extblock(inode, ext);
|
||||
if (IS_ERR(ext_bh)) {
|
||||
affs_warning(sb, "truncate", "unexpected read error for ext block %u (%d)",
|
||||
ext, PTR_ERR(ext_bh));
|
||||
return;
|
||||
}
|
||||
if (AFFS_I(inode)->i_lc) {
|
||||
/* clear linear cache */
|
||||
i = (ext + 1) >> AFFS_I(inode)->i_lc_shift;
|
||||
if (AFFS_I(inode)->i_lc_size > i) {
|
||||
AFFS_I(inode)->i_lc_size = i;
|
||||
for (; i < AFFS_LC_SIZE; i++)
|
||||
AFFS_I(inode)->i_lc[i] = 0;
|
||||
}
|
||||
/* clear associative cache */
|
||||
for (i = 0; i < AFFS_AC_SIZE; i++)
|
||||
if (AFFS_I(inode)->i_ac[i].ext >= ext)
|
||||
AFFS_I(inode)->i_ac[i].ext = 0;
|
||||
}
|
||||
ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension);
|
||||
|
||||
blkcnt = AFFS_I(inode)->i_blkcnt;
|
||||
i = 0;
|
||||
blk = last_blk;
|
||||
if (inode->i_size) {
|
||||
i = last_blk % AFFS_SB(sb)->s_hashsize + 1;
|
||||
blk++;
|
||||
} else
|
||||
AFFS_HEAD(ext_bh)->first_data = 0;
|
||||
size = AFFS_SB(sb)->s_hashsize;
|
||||
if (size > blkcnt - blk + i)
|
||||
size = blkcnt - blk + i;
|
||||
for (; i < size; i++, blk++) {
|
||||
affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i)));
|
||||
AFFS_BLOCK(sb, ext_bh, i) = 0;
|
||||
}
|
||||
AFFS_TAIL(sb, ext_bh)->extension = 0;
|
||||
affs_fix_checksum(sb, ext_bh);
|
||||
mark_buffer_dirty_inode(ext_bh, inode);
|
||||
affs_brelse(ext_bh);
|
||||
|
||||
if (inode->i_size) {
|
||||
AFFS_I(inode)->i_blkcnt = last_blk + 1;
|
||||
AFFS_I(inode)->i_extcnt = ext + 1;
|
||||
if (AFFS_SB(sb)->s_flags & SF_OFS) {
|
||||
struct buffer_head *bh = affs_bread_ino(inode, last_blk, 0);
|
||||
u32 tmp;
|
||||
if (IS_ERR(ext_bh)) {
|
||||
affs_warning(sb, "truncate", "unexpected read error for last block %u (%d)",
|
||||
ext, PTR_ERR(ext_bh));
|
||||
return;
|
||||
}
|
||||
tmp = be32_to_cpu(AFFS_DATA_HEAD(bh)->next);
|
||||
AFFS_DATA_HEAD(bh)->next = 0;
|
||||
affs_adjust_checksum(bh, -tmp);
|
||||
affs_brelse(bh);
|
||||
}
|
||||
} else {
|
||||
AFFS_I(inode)->i_blkcnt = 0;
|
||||
AFFS_I(inode)->i_extcnt = 1;
|
||||
}
|
||||
AFFS_I(inode)->mmu_private = inode->i_size;
|
||||
// unlock cache
|
||||
|
||||
while (ext_key) {
|
||||
ext_bh = affs_bread(sb, ext_key);
|
||||
size = AFFS_SB(sb)->s_hashsize;
|
||||
if (size > blkcnt - blk)
|
||||
size = blkcnt - blk;
|
||||
for (i = 0; i < size; i++, blk++)
|
||||
affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i)));
|
||||
affs_free_block(sb, ext_key);
|
||||
ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension);
|
||||
affs_brelse(ext_bh);
|
||||
}
|
||||
affs_free_prealloc(inode);
|
||||
}
|
||||
Reference in New Issue
Block a user