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1010 lines
25 KiB
1010 lines
25 KiB
// SPDX-License-Identifier: GPL-2.0 |
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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 <linux/uio.h> |
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#include <linux/blkdev.h> |
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#include "affs.h" |
|
|
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static struct buffer_head *affs_get_extblock_slow(struct inode *inode, u32 ext); |
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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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pr_debug("open(%lu,%d)\n", |
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inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt)); |
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atomic_inc(&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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pr_debug("release(%lu, %d)\n", |
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inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt)); |
|
|
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if (atomic_dec_and_test(&AFFS_I(inode)->i_opencnt)) { |
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inode_lock(inode); |
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if (inode->i_size != AFFS_I(inode)->mmu_private) |
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affs_truncate(inode); |
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affs_free_prealloc(inode); |
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inode_unlock(inode); |
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} |
|
|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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) |
|
{ |
|
/* 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) |
|
get_bh(bh); |
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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); |
|
|
|
return bh; |
|
} |
|
|
|
static struct buffer_head * |
|
affs_get_extblock_slow(struct inode *inode, u32 ext) |
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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; |
|
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; |
|
BUG_ON(ext > AFFS_I(inode)->i_extcnt); |
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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; |
|
} |
|
|
|
if (ext == 0) { |
|
/* we seek back to the file header block */ |
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ext_key = inode->i_ino; |
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goto read_ext; |
|
} |
|
|
|
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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BUG_ON(ext > AFFS_I(inode)->i_extcnt); |
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|
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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)) |
|
return bh; |
|
goto store_ext; |
|
} |
|
|
|
again: |
|
/* check if there is an extended cache and whether it's large enough */ |
|
lc_idx = ext >> AFFS_I(inode)->i_lc_shift; |
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lc_off = ext & AFFS_I(inode)->i_lc_mask; |
|
|
|
if (lc_idx >= AFFS_I(inode)->i_lc_size) { |
|
int err; |
|
|
|
err = affs_grow_extcache(inode, lc_idx); |
|
if (err) |
|
return ERR_PTR(err); |
|
goto again; |
|
} |
|
|
|
/* every n'th key we find in the linear cache */ |
|
if (!lc_off) { |
|
ext_key = AFFS_I(inode)->i_lc[lc_idx]; |
|
goto read_ext; |
|
} |
|
|
|
/* 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; |
|
goto read_ext; |
|
} |
|
|
|
/* 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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/* 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: |
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/* 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; |
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AFFS_I(inode)->i_ext_bh = bh; |
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get_bh(bh); |
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|
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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) |
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{ |
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struct super_block *sb = inode->i_sb; |
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struct buffer_head *ext_bh; |
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u32 ext; |
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|
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pr_debug("%s(%lu, %llu)\n", __func__, inode->i_ino, |
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(unsigned long long)block); |
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|
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BUG_ON(block > (sector_t)0x7fffffffUL); |
|
|
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if (block >= AFFS_I(inode)->i_blkcnt) { |
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if (block > AFFS_I(inode)->i_blkcnt || !create) |
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goto err_big; |
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} else |
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create = 0; |
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|
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//lock cache |
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affs_lock_ext(inode); |
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|
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ext = (u32)block / AFFS_SB(sb)->s_hashsize; |
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block -= ext * AFFS_SB(sb)->s_hashsize; |
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ext_bh = affs_get_extblock(inode, ext); |
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if (IS_ERR(ext_bh)) |
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goto err_ext; |
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map_bh(bh_result, sb, (sector_t)be32_to_cpu(AFFS_BLOCK(sb, ext_bh, block))); |
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|
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if (create) { |
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u32 blocknr = affs_alloc_block(inode, ext_bh->b_blocknr); |
|
if (!blocknr) |
|
goto err_alloc; |
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set_buffer_new(bh_result); |
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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 (%llx)", |
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(unsigned long long)bh_result->b_blocknr); |
|
AFFS_BLOCK(sb, ext_bh, block) = cpu_to_be32(blocknr); |
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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; |
|
|
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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); |
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} |
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} |
|
|
|
affs_brelse(ext_bh); |
|
//unlock cache |
|
affs_unlock_ext(inode); |
|
return 0; |
|
|
|
err_big: |
|
affs_error(inode->i_sb, "get_block", "strange block request %llu", |
|
(unsigned long long)block); |
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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; |
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// 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); |
|
} |
|
|
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static int affs_readpage(struct file *file, struct page *page) |
|
{ |
|
return block_read_full_page(page, affs_get_block); |
|
} |
|
|
|
static void affs_write_failed(struct address_space *mapping, loff_t to) |
|
{ |
|
struct inode *inode = mapping->host; |
|
|
|
if (to > inode->i_size) { |
|
truncate_pagecache(inode, inode->i_size); |
|
affs_truncate(inode); |
|
} |
|
} |
|
|
|
static ssize_t |
|
affs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) |
|
{ |
|
struct file *file = iocb->ki_filp; |
|
struct address_space *mapping = file->f_mapping; |
|
struct inode *inode = mapping->host; |
|
size_t count = iov_iter_count(iter); |
|
loff_t offset = iocb->ki_pos; |
|
ssize_t ret; |
|
|
|
if (iov_iter_rw(iter) == WRITE) { |
|
loff_t size = offset + count; |
|
|
|
if (AFFS_I(inode)->mmu_private < size) |
|
return 0; |
|
} |
|
|
|
ret = blockdev_direct_IO(iocb, inode, iter, affs_get_block); |
|
if (ret < 0 && iov_iter_rw(iter) == WRITE) |
|
affs_write_failed(mapping, offset + count); |
|
return ret; |
|
} |
|
|
|
static int affs_write_begin(struct file *file, struct address_space *mapping, |
|
loff_t pos, unsigned len, unsigned flags, |
|
struct page **pagep, void **fsdata) |
|
{ |
|
int ret; |
|
|
|
*pagep = NULL; |
|
ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, |
|
affs_get_block, |
|
&AFFS_I(mapping->host)->mmu_private); |
|
if (unlikely(ret)) |
|
affs_write_failed(mapping, pos + len); |
|
|
|
return ret; |
|
} |
|
|
|
static int affs_write_end(struct file *file, struct address_space *mapping, |
|
loff_t pos, unsigned int len, unsigned int copied, |
|
struct page *page, void *fsdata) |
|
{ |
|
struct inode *inode = mapping->host; |
|
int ret; |
|
|
|
ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); |
|
|
|
/* Clear Archived bit on file writes, as AmigaOS would do */ |
|
if (AFFS_I(inode)->i_protect & FIBF_ARCHIVED) { |
|
AFFS_I(inode)->i_protect &= ~FIBF_ARCHIVED; |
|
mark_inode_dirty(inode); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static sector_t _affs_bmap(struct address_space *mapping, sector_t block) |
|
{ |
|
return generic_block_bmap(mapping,block,affs_get_block); |
|
} |
|
|
|
const struct address_space_operations affs_aops = { |
|
.set_page_dirty = __set_page_dirty_buffers, |
|
.readpage = affs_readpage, |
|
.writepage = affs_writepage, |
|
.write_begin = affs_write_begin, |
|
.write_end = affs_write_end, |
|
.direct_IO = affs_direct_IO, |
|
.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 int |
|
affs_do_readpage_ofs(struct page *page, unsigned to, int create) |
|
{ |
|
struct inode *inode = page->mapping->host; |
|
struct super_block *sb = inode->i_sb; |
|
struct buffer_head *bh; |
|
char *data; |
|
unsigned pos = 0; |
|
u32 bidx, boff, bsize; |
|
u32 tmp; |
|
|
|
pr_debug("%s(%lu, %ld, 0, %d)\n", __func__, inode->i_ino, |
|
page->index, to); |
|
BUG_ON(to > PAGE_SIZE); |
|
bsize = AFFS_SB(sb)->s_data_blksize; |
|
tmp = page->index << PAGE_SHIFT; |
|
bidx = tmp / bsize; |
|
boff = tmp % bsize; |
|
|
|
while (pos < to) { |
|
bh = affs_bread_ino(inode, bidx, create); |
|
if (IS_ERR(bh)) |
|
return PTR_ERR(bh); |
|
tmp = min(bsize - boff, to - pos); |
|
BUG_ON(pos + tmp > to || tmp > bsize); |
|
data = kmap_atomic(page); |
|
memcpy(data + pos, AFFS_DATA(bh) + boff, tmp); |
|
kunmap_atomic(data); |
|
affs_brelse(bh); |
|
bidx++; |
|
pos += tmp; |
|
boff = 0; |
|
} |
|
flush_dcache_page(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("%s(%lu, %d)\n", __func__, 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); |
|
BUG_ON(boff + tmp > bsize || tmp > bsize); |
|
memset(AFFS_DATA(bh) + boff, 0, tmp); |
|
be32_add_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); |
|
BUG_ON(tmp > bsize); |
|
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_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next); |
|
|
|
if (tmp_next) |
|
affs_warning(sb, "extent_file_ofs", |
|
"next block already set for %d (%d)", |
|
bidx, tmp_next); |
|
AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr); |
|
affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next); |
|
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("%s(%lu, %ld)\n", __func__, inode->i_ino, page->index); |
|
to = PAGE_SIZE; |
|
if (((page->index + 1) << PAGE_SHIFT) > inode->i_size) { |
|
to = inode->i_size & ~PAGE_MASK; |
|
memset(page_address(page) + to, 0, PAGE_SIZE - to); |
|
} |
|
|
|
err = affs_do_readpage_ofs(page, to, 0); |
|
if (!err) |
|
SetPageUptodate(page); |
|
unlock_page(page); |
|
return err; |
|
} |
|
|
|
static int affs_write_begin_ofs(struct file *file, struct address_space *mapping, |
|
loff_t pos, unsigned len, unsigned flags, |
|
struct page **pagep, void **fsdata) |
|
{ |
|
struct inode *inode = mapping->host; |
|
struct page *page; |
|
pgoff_t index; |
|
int err = 0; |
|
|
|
pr_debug("%s(%lu, %llu, %llu)\n", __func__, inode->i_ino, pos, |
|
pos + len); |
|
if (pos > AFFS_I(inode)->mmu_private) { |
|
/* XXX: this probably leaves a too-big i_size in case of |
|
* failure. Should really be updating i_size at write_end time |
|
*/ |
|
err = affs_extent_file_ofs(inode, pos); |
|
if (err) |
|
return err; |
|
} |
|
|
|
index = pos >> PAGE_SHIFT; |
|
page = grab_cache_page_write_begin(mapping, index, flags); |
|
if (!page) |
|
return -ENOMEM; |
|
*pagep = page; |
|
|
|
if (PageUptodate(page)) |
|
return 0; |
|
|
|
/* XXX: inefficient but safe in the face of short writes */ |
|
err = affs_do_readpage_ofs(page, PAGE_SIZE, 1); |
|
if (err) { |
|
unlock_page(page); |
|
put_page(page); |
|
} |
|
return err; |
|
} |
|
|
|
static int affs_write_end_ofs(struct file *file, struct address_space *mapping, |
|
loff_t pos, unsigned len, unsigned copied, |
|
struct page *page, void *fsdata) |
|
{ |
|
struct inode *inode = mapping->host; |
|
struct super_block *sb = inode->i_sb; |
|
struct buffer_head *bh, *prev_bh; |
|
char *data; |
|
u32 bidx, boff, bsize; |
|
unsigned from, to; |
|
u32 tmp; |
|
int written; |
|
|
|
from = pos & (PAGE_SIZE - 1); |
|
to = from + len; |
|
/* |
|
* XXX: not sure if this can handle short copies (len < copied), but |
|
* we don't have to, because the page should always be uptodate here, |
|
* due to write_begin. |
|
*/ |
|
|
|
pr_debug("%s(%lu, %llu, %llu)\n", __func__, inode->i_ino, pos, |
|
pos + len); |
|
bsize = AFFS_SB(sb)->s_data_blksize; |
|
data = page_address(page); |
|
|
|
bh = NULL; |
|
written = 0; |
|
tmp = (page->index << PAGE_SHIFT) + from; |
|
bidx = tmp / bsize; |
|
boff = tmp % bsize; |
|
if (boff) { |
|
bh = affs_bread_ino(inode, bidx, 0); |
|
if (IS_ERR(bh)) { |
|
written = PTR_ERR(bh); |
|
goto err_first_bh; |
|
} |
|
tmp = min(bsize - boff, to - from); |
|
BUG_ON(boff + tmp > bsize || tmp > bsize); |
|
memcpy(AFFS_DATA(bh) + boff, data + from, tmp); |
|
be32_add_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)) { |
|
written = PTR_ERR(bh); |
|
goto err_first_bh; |
|
} |
|
} |
|
while (from + bsize <= to) { |
|
prev_bh = bh; |
|
bh = affs_getemptyblk_ino(inode, bidx); |
|
if (IS_ERR(bh)) |
|
goto err_bh; |
|
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_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next); |
|
|
|
if (tmp_next) |
|
affs_warning(sb, "commit_write_ofs", |
|
"next block already set for %d (%d)", |
|
bidx, tmp_next); |
|
AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr); |
|
affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next); |
|
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 err_bh; |
|
tmp = min(bsize, to - from); |
|
BUG_ON(tmp > bsize); |
|
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_next = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next); |
|
|
|
if (tmp_next) |
|
affs_warning(sb, "commit_write_ofs", |
|
"next block already set for %d (%d)", |
|
bidx, tmp_next); |
|
AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr); |
|
affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp_next); |
|
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_SHIFT) + from; |
|
if (tmp > inode->i_size) |
|
inode->i_size = AFFS_I(inode)->mmu_private = tmp; |
|
|
|
/* Clear Archived bit on file writes, as AmigaOS would do */ |
|
if (AFFS_I(inode)->i_protect & FIBF_ARCHIVED) { |
|
AFFS_I(inode)->i_protect &= ~FIBF_ARCHIVED; |
|
mark_inode_dirty(inode); |
|
} |
|
|
|
err_first_bh: |
|
unlock_page(page); |
|
put_page(page); |
|
|
|
return written; |
|
|
|
err_bh: |
|
bh = prev_bh; |
|
if (!written) |
|
written = PTR_ERR(bh); |
|
goto done; |
|
} |
|
|
|
const struct address_space_operations affs_aops_ofs = { |
|
.set_page_dirty = __set_page_dirty_buffers, |
|
.readpage = affs_readpage_ofs, |
|
//.writepage = affs_writepage_ofs, |
|
.write_begin = affs_write_begin_ofs, |
|
.write_end = affs_write_end_ofs |
|
}; |
|
|
|
/* Free any preallocated blocks. */ |
|
|
|
void |
|
affs_free_prealloc(struct inode *inode) |
|
{ |
|
struct super_block *sb = inode->i_sb; |
|
|
|
pr_debug("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("truncate(inode=%lu, oldsize=%llu, newsize=%llu)\n", |
|
inode->i_ino, AFFS_I(inode)->mmu_private, 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; |
|
void *fsdata; |
|
loff_t isize = inode->i_size; |
|
int res; |
|
|
|
res = mapping->a_ops->write_begin(NULL, mapping, isize, 0, 0, &page, &fsdata); |
|
if (!res) |
|
res = mapping->a_ops->write_end(NULL, mapping, isize, 0, 0, page, fsdata); |
|
else |
|
inode->i_size = AFFS_I(inode)->mmu_private; |
|
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 (%ld)", |
|
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; |
|
AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(i); |
|
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_test_opt(AFFS_SB(sb)->s_flags, SF_OFS)) { |
|
struct buffer_head *bh = affs_bread_ino(inode, last_blk, 0); |
|
u32 tmp; |
|
if (IS_ERR(bh)) { |
|
affs_warning(sb, "truncate", |
|
"unexpected read error for last block %u (%ld)", |
|
ext, PTR_ERR(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); |
|
} |
|
|
|
int affs_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync) |
|
{ |
|
struct inode *inode = filp->f_mapping->host; |
|
int ret, err; |
|
|
|
err = file_write_and_wait_range(filp, start, end); |
|
if (err) |
|
return err; |
|
|
|
inode_lock(inode); |
|
ret = write_inode_now(inode, 0); |
|
err = sync_blockdev(inode->i_sb->s_bdev); |
|
if (!ret) |
|
ret = err; |
|
inode_unlock(inode); |
|
return ret; |
|
} |
|
const struct file_operations affs_file_operations = { |
|
.llseek = generic_file_llseek, |
|
.read_iter = generic_file_read_iter, |
|
.write_iter = generic_file_write_iter, |
|
.mmap = generic_file_mmap, |
|
.open = affs_file_open, |
|
.release = affs_file_release, |
|
.fsync = affs_file_fsync, |
|
.splice_read = generic_file_splice_read, |
|
}; |
|
|
|
const struct inode_operations affs_file_inode_operations = { |
|
.setattr = affs_notify_change, |
|
};
|
|
|