diff options
Diffstat (limited to 'fs/ufs/util.c')
| -rw-r--r-- | fs/ufs/util.c | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/fs/ufs/util.c b/fs/ufs/util.c new file mode 100644 index 0000000000..08ddf41eaa --- /dev/null +++ b/fs/ufs/util.c @@ -0,0 +1,271 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/fs/ufs/util.c + * + * Copyright (C) 1998 + * Daniel Pirkl <daniel.pirkl@email.cz> + * Charles University, Faculty of Mathematics and Physics + */ + +#include <linux/string.h> +#include <linux/slab.h> +#include <linux/buffer_head.h> + +#include "ufs_fs.h" +#include "ufs.h" +#include "swab.h" +#include "util.h" + +struct ufs_buffer_head * _ubh_bread_ (struct ufs_sb_private_info * uspi, + struct super_block *sb, u64 fragment, u64 size) +{ + struct ufs_buffer_head * ubh; + unsigned i, j ; + u64 count = 0; + if (size & ~uspi->s_fmask) + return NULL; + count = size >> uspi->s_fshift; + if (count > UFS_MAXFRAG) + return NULL; + ubh = kmalloc (sizeof (struct ufs_buffer_head), GFP_NOFS); + if (!ubh) + return NULL; + ubh->fragment = fragment; + ubh->count = count; + for (i = 0; i < count; i++) + if (!(ubh->bh[i] = sb_bread(sb, fragment + i))) + goto failed; + for (; i < UFS_MAXFRAG; i++) + ubh->bh[i] = NULL; + return ubh; +failed: + for (j = 0; j < i; j++) + brelse (ubh->bh[j]); + kfree(ubh); + return NULL; +} + +struct ufs_buffer_head * ubh_bread_uspi (struct ufs_sb_private_info * uspi, + struct super_block *sb, u64 fragment, u64 size) +{ + unsigned i, j; + u64 count = 0; + if (size & ~uspi->s_fmask) + return NULL; + count = size >> uspi->s_fshift; + if (count <= 0 || count > UFS_MAXFRAG) + return NULL; + USPI_UBH(uspi)->fragment = fragment; + USPI_UBH(uspi)->count = count; + for (i = 0; i < count; i++) + if (!(USPI_UBH(uspi)->bh[i] = sb_bread(sb, fragment + i))) + goto failed; + for (; i < UFS_MAXFRAG; i++) + USPI_UBH(uspi)->bh[i] = NULL; + return USPI_UBH(uspi); +failed: + for (j = 0; j < i; j++) + brelse (USPI_UBH(uspi)->bh[j]); + return NULL; +} + +void ubh_brelse (struct ufs_buffer_head * ubh) +{ + unsigned i; + if (!ubh) + return; + for (i = 0; i < ubh->count; i++) + brelse (ubh->bh[i]); + kfree (ubh); +} + +void ubh_brelse_uspi (struct ufs_sb_private_info * uspi) +{ + unsigned i; + if (!USPI_UBH(uspi)) + return; + for ( i = 0; i < USPI_UBH(uspi)->count; i++ ) { + brelse (USPI_UBH(uspi)->bh[i]); + USPI_UBH(uspi)->bh[i] = NULL; + } +} + +void ubh_mark_buffer_dirty (struct ufs_buffer_head * ubh) +{ + unsigned i; + if (!ubh) + return; + for ( i = 0; i < ubh->count; i++ ) + mark_buffer_dirty (ubh->bh[i]); +} + +void ubh_mark_buffer_uptodate (struct ufs_buffer_head * ubh, int flag) +{ + unsigned i; + if (!ubh) + return; + if (flag) { + for ( i = 0; i < ubh->count; i++ ) + set_buffer_uptodate (ubh->bh[i]); + } else { + for ( i = 0; i < ubh->count; i++ ) + clear_buffer_uptodate (ubh->bh[i]); + } +} + +void ubh_sync_block(struct ufs_buffer_head *ubh) +{ + if (ubh) { + unsigned i; + + for (i = 0; i < ubh->count; i++) + write_dirty_buffer(ubh->bh[i], 0); + + for (i = 0; i < ubh->count; i++) + wait_on_buffer(ubh->bh[i]); + } +} + +void ubh_bforget (struct ufs_buffer_head * ubh) +{ + unsigned i; + if (!ubh) + return; + for ( i = 0; i < ubh->count; i++ ) if ( ubh->bh[i] ) + bforget (ubh->bh[i]); +} + +int ubh_buffer_dirty (struct ufs_buffer_head * ubh) +{ + unsigned i; + unsigned result = 0; + if (!ubh) + return 0; + for ( i = 0; i < ubh->count; i++ ) + result |= buffer_dirty(ubh->bh[i]); + return result; +} + +void _ubh_ubhcpymem_(struct ufs_sb_private_info * uspi, + unsigned char * mem, struct ufs_buffer_head * ubh, unsigned size) +{ + unsigned len, bhno; + if (size > (ubh->count << uspi->s_fshift)) + size = ubh->count << uspi->s_fshift; + bhno = 0; + while (size) { + len = min_t(unsigned int, size, uspi->s_fsize); + memcpy (mem, ubh->bh[bhno]->b_data, len); + mem += uspi->s_fsize; + size -= len; + bhno++; + } +} + +void _ubh_memcpyubh_(struct ufs_sb_private_info * uspi, + struct ufs_buffer_head * ubh, unsigned char * mem, unsigned size) +{ + unsigned len, bhno; + if (size > (ubh->count << uspi->s_fshift)) + size = ubh->count << uspi->s_fshift; + bhno = 0; + while (size) { + len = min_t(unsigned int, size, uspi->s_fsize); + memcpy (ubh->bh[bhno]->b_data, mem, len); + mem += uspi->s_fsize; + size -= len; + bhno++; + } +} + +dev_t +ufs_get_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi) +{ + __u32 fs32; + dev_t dev; + + if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86) + fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[1]); + else + fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[0]); + switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) { + case UFS_ST_SUNx86: + case UFS_ST_SUN: + if ((fs32 & 0xffff0000) == 0 || + (fs32 & 0xffff0000) == 0xffff0000) + dev = old_decode_dev(fs32 & 0x7fff); + else + dev = MKDEV(sysv_major(fs32), sysv_minor(fs32)); + break; + + default: + dev = old_decode_dev(fs32); + break; + } + return dev; +} + +void +ufs_set_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi, dev_t dev) +{ + __u32 fs32; + + switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) { + case UFS_ST_SUNx86: + case UFS_ST_SUN: + fs32 = sysv_encode_dev(dev); + if ((fs32 & 0xffff8000) == 0) { + fs32 = old_encode_dev(dev); + } + break; + + default: + fs32 = old_encode_dev(dev); + break; + } + if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86) + ufsi->i_u1.i_data[1] = cpu_to_fs32(sb, fs32); + else + ufsi->i_u1.i_data[0] = cpu_to_fs32(sb, fs32); +} + +/** + * ufs_get_locked_page() - locate, pin and lock a pagecache page, if not exist + * read it from disk. + * @mapping: the address_space to search + * @index: the page index + * + * Locates the desired pagecache page, if not exist we'll read it, + * locks it, increments its reference + * count and returns its address. + * + */ + +struct page *ufs_get_locked_page(struct address_space *mapping, + pgoff_t index) +{ + struct inode *inode = mapping->host; + struct page *page = find_lock_page(mapping, index); + if (!page) { + page = read_mapping_page(mapping, index, NULL); + + if (IS_ERR(page)) { + printk(KERN_ERR "ufs_change_blocknr: " + "read_mapping_page error: ino %lu, index: %lu\n", + mapping->host->i_ino, index); + return page; + } + + lock_page(page); + + if (unlikely(page->mapping == NULL)) { + /* Truncate got there first */ + unlock_page(page); + put_page(page); + return NULL; + } + } + if (!page_has_buffers(page)) + create_empty_buffers(page, 1 << inode->i_blkbits, 0); + return page; +} |