diff options
author | Al Viro <viro@zeniv.linux.org.uk> | 2015-06-17 18:44:14 +0200 |
---|---|---|
committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-07-06 23:39:30 +0200 |
commit | 010d331fc315c96607aa6ecdfebb9fcdd349fc9b (patch) | |
tree | 44e06394ba81faaad442195ef2377e44451f11d5 /fs/ufs/truncate.c | |
parent | ufs: no retries are needed on truncate (diff) | |
download | linux-010d331fc315c96607aa6ecdfebb9fcdd349fc9b.tar.xz linux-010d331fc315c96607aa6ecdfebb9fcdd349fc9b.zip |
ufs: move truncate code into inode.c
It is closely tied to block pointers handling there, can benefit
from existing helpers, etc. - no point keeping them apart.
Trimmed the trailing whitespaces in inode.c at the same time.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/ufs/truncate.c')
-rw-r--r-- | fs/ufs/truncate.c | 515 |
1 files changed, 0 insertions, 515 deletions
diff --git a/fs/ufs/truncate.c b/fs/ufs/truncate.c deleted file mode 100644 index f84dd3078929..000000000000 --- a/fs/ufs/truncate.c +++ /dev/null @@ -1,515 +0,0 @@ -/* - * linux/fs/ufs/truncate.c - * - * Copyright (C) 1998 - * Daniel Pirkl <daniel.pirkl@email.cz> - * Charles University, Faculty of Mathematics and Physics - * - * from - * - * linux/fs/ext2/truncate.c - * - * Copyright (C) 1992, 1993, 1994, 1995 - * Remy Card (card@masi.ibp.fr) - * Laboratoire MASI - Institut Blaise Pascal - * Universite Pierre et Marie Curie (Paris VI) - * - * from - * - * linux/fs/minix/truncate.c - * - * Copyright (C) 1991, 1992 Linus Torvalds - * - * Big-endian to little-endian byte-swapping/bitmaps by - * David S. Miller (davem@caip.rutgers.edu), 1995 - */ - -/* - * Real random numbers for secure rm added 94/02/18 - * Idea from Pierre del Perugia <delperug@gla.ecoledoc.ibp.fr> - */ - -/* - * Adoptation to use page cache and UFS2 write support by - * Evgeniy Dushistov <dushistov@mail.ru>, 2006-2007 - */ - -#include <linux/errno.h> -#include <linux/fs.h> -#include <linux/fcntl.h> -#include <linux/time.h> -#include <linux/stat.h> -#include <linux/string.h> -#include <linux/buffer_head.h> -#include <linux/blkdev.h> -#include <linux/sched.h> - -#include "ufs_fs.h" -#include "ufs.h" -#include "swab.h" -#include "util.h" - -/* - * Secure deletion currently doesn't work. It interacts very badly - * with buffers shared with memory mappings, and for that reason - * can't be done in the truncate() routines. It should instead be - * done separately in "release()" before calling the truncate routines - * that will release the actual file blocks. - * - * Linus - */ - -#define DIRECT_BLOCK ((inode->i_size + uspi->s_bsize - 1) >> uspi->s_bshift) -#define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift) - - -static void ufs_trunc_direct(struct inode *inode) -{ - struct ufs_inode_info *ufsi = UFS_I(inode); - struct super_block * sb; - struct ufs_sb_private_info * uspi; - void *p; - u64 frag1, frag2, frag3, frag4, block1, block2; - unsigned frag_to_free, free_count; - unsigned i, tmp; - - UFSD("ENTER: ino %lu\n", inode->i_ino); - - sb = inode->i_sb; - uspi = UFS_SB(sb)->s_uspi; - - frag_to_free = 0; - free_count = 0; - - frag1 = DIRECT_FRAGMENT; - frag4 = min_t(u64, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag); - frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1); - frag3 = frag4 & ~uspi->s_fpbmask; - block1 = block2 = 0; - if (frag2 > frag3) { - frag2 = frag4; - frag3 = frag4 = 0; - } else if (frag2 < frag3) { - block1 = ufs_fragstoblks (frag2); - block2 = ufs_fragstoblks (frag3); - } - - UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu," - " frag3 %llu, frag4 %llu\n", inode->i_ino, - (unsigned long long)frag1, (unsigned long long)frag2, - (unsigned long long)block1, (unsigned long long)block2, - (unsigned long long)frag3, (unsigned long long)frag4); - - if (frag1 >= frag2) - goto next1; - - /* - * Free first free fragments - */ - p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1)); - tmp = ufs_data_ptr_to_cpu(sb, p); - if (!tmp ) - ufs_panic (sb, "ufs_trunc_direct", "internal error"); - frag2 -= frag1; - frag1 = ufs_fragnum (frag1); - - ufs_free_fragments(inode, tmp + frag1, frag2); - mark_inode_dirty(inode); - frag_to_free = tmp + frag1; - -next1: - /* - * Free whole blocks - */ - for (i = block1 ; i < block2; i++) { - p = ufs_get_direct_data_ptr(uspi, ufsi, i); - tmp = ufs_data_ptr_to_cpu(sb, p); - if (!tmp) - continue; - write_seqlock(&ufsi->meta_lock); - ufs_data_ptr_clear(uspi, p); - write_sequnlock(&ufsi->meta_lock); - - if (free_count == 0) { - frag_to_free = tmp; - free_count = uspi->s_fpb; - } else if (free_count > 0 && frag_to_free == tmp - free_count) - free_count += uspi->s_fpb; - else { - ufs_free_blocks (inode, frag_to_free, free_count); - frag_to_free = tmp; - free_count = uspi->s_fpb; - } - mark_inode_dirty(inode); - } - - if (free_count > 0) - ufs_free_blocks (inode, frag_to_free, free_count); - - if (frag3 >= frag4) - goto next3; - - /* - * Free last free fragments - */ - p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3)); - tmp = ufs_data_ptr_to_cpu(sb, p); - if (!tmp ) - ufs_panic(sb, "ufs_truncate_direct", "internal error"); - frag4 = ufs_fragnum (frag4); - write_seqlock(&ufsi->meta_lock); - ufs_data_ptr_clear(uspi, p); - write_sequnlock(&ufsi->meta_lock); - - ufs_free_fragments (inode, tmp, frag4); - mark_inode_dirty(inode); - next3: - - UFSD("EXIT: ino %lu\n", inode->i_ino); -} - - -static void ufs_trunc_indirect(struct inode *inode, u64 offset, void *p) -{ - struct super_block * sb; - struct ufs_sb_private_info * uspi; - struct ufs_buffer_head * ind_ubh; - void *ind; - u64 tmp, indirect_block, i, frag_to_free; - unsigned free_count; - - UFSD("ENTER: ino %lu, offset %llu, p: %p\n", - inode->i_ino, (unsigned long long)offset, p); - - BUG_ON(!p); - - sb = inode->i_sb; - uspi = UFS_SB(sb)->s_uspi; - - frag_to_free = 0; - free_count = 0; - - tmp = ufs_data_ptr_to_cpu(sb, p); - if (!tmp) - return; - ind_ubh = ubh_bread(sb, tmp, uspi->s_bsize); - if (!ind_ubh) { - write_seqlock(&UFS_I(inode)->meta_lock); - ufs_data_ptr_clear(uspi, p); - write_sequnlock(&UFS_I(inode)->meta_lock); - return; - } - - indirect_block = (DIRECT_BLOCK > offset) ? (DIRECT_BLOCK - offset) : 0; - for (i = indirect_block; i < uspi->s_apb; i++) { - ind = ubh_get_data_ptr(uspi, ind_ubh, i); - tmp = ufs_data_ptr_to_cpu(sb, ind); - if (!tmp) - continue; - - write_seqlock(&UFS_I(inode)->meta_lock); - ufs_data_ptr_clear(uspi, ind); - write_sequnlock(&UFS_I(inode)->meta_lock); - ubh_mark_buffer_dirty(ind_ubh); - if (free_count == 0) { - frag_to_free = tmp; - free_count = uspi->s_fpb; - } else if (free_count > 0 && frag_to_free == tmp - free_count) - free_count += uspi->s_fpb; - else { - ufs_free_blocks (inode, frag_to_free, free_count); - frag_to_free = tmp; - free_count = uspi->s_fpb; - } - - mark_inode_dirty(inode); - } - - if (free_count > 0) { - ufs_free_blocks (inode, frag_to_free, free_count); - } - for (i = 0; i < uspi->s_apb; i++) - if (!ufs_is_data_ptr_zero(uspi, - ubh_get_data_ptr(uspi, ind_ubh, i))) - break; - if (i >= uspi->s_apb) { - tmp = ufs_data_ptr_to_cpu(sb, p); - write_seqlock(&UFS_I(inode)->meta_lock); - ufs_data_ptr_clear(uspi, p); - write_sequnlock(&UFS_I(inode)->meta_lock); - - ubh_bforget(ind_ubh); - ufs_free_blocks (inode, tmp, uspi->s_fpb); - mark_inode_dirty(inode); - ind_ubh = NULL; - } - if (IS_SYNC(inode) && ind_ubh && ubh_buffer_dirty(ind_ubh)) - ubh_sync_block(ind_ubh); - ubh_brelse (ind_ubh); - - UFSD("EXIT: ino %lu\n", inode->i_ino); -} - -static void ufs_trunc_dindirect(struct inode *inode, u64 offset, void *p) -{ - struct super_block * sb; - struct ufs_sb_private_info * uspi; - struct ufs_buffer_head *dind_bh; - u64 i, tmp, dindirect_block; - void *dind; - - UFSD("ENTER: ino %lu\n", inode->i_ino); - - sb = inode->i_sb; - uspi = UFS_SB(sb)->s_uspi; - - dindirect_block = (DIRECT_BLOCK > offset) - ? ((DIRECT_BLOCK - offset) >> uspi->s_apbshift) : 0; - - tmp = ufs_data_ptr_to_cpu(sb, p); - if (!tmp) - return; - dind_bh = ubh_bread(sb, tmp, uspi->s_bsize); - if (!dind_bh) { - write_seqlock(&UFS_I(inode)->meta_lock); - ufs_data_ptr_clear(uspi, p); - write_sequnlock(&UFS_I(inode)->meta_lock); - return; - } - - for (i = dindirect_block ; i < uspi->s_apb ; i++) { - dind = ubh_get_data_ptr(uspi, dind_bh, i); - tmp = ufs_data_ptr_to_cpu(sb, dind); - if (!tmp) - continue; - ufs_trunc_indirect (inode, offset + (i << uspi->s_apbshift), dind); - ubh_mark_buffer_dirty(dind_bh); - } - - for (i = 0; i < uspi->s_apb; i++) - if (!ufs_is_data_ptr_zero(uspi, - ubh_get_data_ptr(uspi, dind_bh, i))) - break; - if (i >= uspi->s_apb) { - tmp = ufs_data_ptr_to_cpu(sb, p); - write_seqlock(&UFS_I(inode)->meta_lock); - ufs_data_ptr_clear(uspi, p); - write_sequnlock(&UFS_I(inode)->meta_lock); - - ubh_bforget(dind_bh); - ufs_free_blocks(inode, tmp, uspi->s_fpb); - mark_inode_dirty(inode); - dind_bh = NULL; - } - if (IS_SYNC(inode) && dind_bh && ubh_buffer_dirty(dind_bh)) - ubh_sync_block(dind_bh); - ubh_brelse (dind_bh); - - UFSD("EXIT: ino %lu\n", inode->i_ino); -} - -static void ufs_trunc_tindirect(struct inode *inode) -{ - struct super_block *sb = inode->i_sb; - struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi; - struct ufs_inode_info *ufsi = UFS_I(inode); - struct ufs_buffer_head * tind_bh; - u64 tindirect_block, tmp, i; - void *tind, *p; - - UFSD("ENTER: ino %lu\n", inode->i_ino); - - tindirect_block = (DIRECT_BLOCK > (UFS_NDADDR + uspi->s_apb + uspi->s_2apb)) - ? ((DIRECT_BLOCK - UFS_NDADDR - uspi->s_apb - uspi->s_2apb) >> uspi->s_2apbshift) : 0; - - p = ufs_get_direct_data_ptr(uspi, ufsi, UFS_TIND_BLOCK); - if (!(tmp = ufs_data_ptr_to_cpu(sb, p))) - return; - tind_bh = ubh_bread (sb, tmp, uspi->s_bsize); - if (!tind_bh) { - write_seqlock(&ufsi->meta_lock); - ufs_data_ptr_clear(uspi, p); - write_sequnlock(&ufsi->meta_lock); - return; - } - - for (i = tindirect_block ; i < uspi->s_apb ; i++) { - tind = ubh_get_data_ptr(uspi, tind_bh, i); - ufs_trunc_dindirect(inode, UFS_NDADDR + - uspi->s_apb + ((i + 1) << uspi->s_2apbshift), tind); - ubh_mark_buffer_dirty(tind_bh); - } - for (i = 0; i < uspi->s_apb; i++) - if (!ufs_is_data_ptr_zero(uspi, - ubh_get_data_ptr(uspi, tind_bh, i))) - break; - if (i >= uspi->s_apb) { - tmp = ufs_data_ptr_to_cpu(sb, p); - write_seqlock(&ufsi->meta_lock); - ufs_data_ptr_clear(uspi, p); - write_sequnlock(&ufsi->meta_lock); - - ubh_bforget(tind_bh); - ufs_free_blocks(inode, tmp, uspi->s_fpb); - mark_inode_dirty(inode); - tind_bh = NULL; - } - if (IS_SYNC(inode) && tind_bh && ubh_buffer_dirty(tind_bh)) - ubh_sync_block(tind_bh); - ubh_brelse (tind_bh); - - UFSD("EXIT: ino %lu\n", inode->i_ino); -} - -static int ufs_alloc_lastblock(struct inode *inode, loff_t size) -{ - int err = 0; - struct super_block *sb = inode->i_sb; - struct address_space *mapping = inode->i_mapping; - struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi; - unsigned i, end; - sector_t lastfrag; - struct page *lastpage; - struct buffer_head *bh; - u64 phys64; - - lastfrag = (size + uspi->s_fsize - 1) >> uspi->s_fshift; - - if (!lastfrag) - goto out; - - lastfrag--; - - lastpage = ufs_get_locked_page(mapping, lastfrag >> - (PAGE_CACHE_SHIFT - inode->i_blkbits)); - if (IS_ERR(lastpage)) { - err = -EIO; - goto out; - } - - end = lastfrag & ((1 << (PAGE_CACHE_SHIFT - inode->i_blkbits)) - 1); - bh = page_buffers(lastpage); - for (i = 0; i < end; ++i) - bh = bh->b_this_page; - - - err = ufs_getfrag_block(inode, lastfrag, bh, 1); - - if (unlikely(err)) - goto out_unlock; - - if (buffer_new(bh)) { - clear_buffer_new(bh); - unmap_underlying_metadata(bh->b_bdev, - bh->b_blocknr); - /* - * we do not zeroize fragment, because of - * if it maped to hole, it already contains zeroes - */ - set_buffer_uptodate(bh); - mark_buffer_dirty(bh); - set_page_dirty(lastpage); - } - - if (lastfrag >= UFS_IND_FRAGMENT) { - end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1; - phys64 = bh->b_blocknr + 1; - for (i = 0; i < end; ++i) { - bh = sb_getblk(sb, i + phys64); - lock_buffer(bh); - memset(bh->b_data, 0, sb->s_blocksize); - set_buffer_uptodate(bh); - mark_buffer_dirty(bh); - unlock_buffer(bh); - sync_dirty_buffer(bh); - brelse(bh); - } - } -out_unlock: - ufs_put_locked_page(lastpage); -out: - return err; -} - -static void __ufs_truncate_blocks(struct inode *inode) -{ - struct ufs_inode_info *ufsi = UFS_I(inode); - struct super_block *sb = inode->i_sb; - struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi; - - mutex_lock(&ufsi->truncate_mutex); - ufs_trunc_direct(inode); - ufs_trunc_indirect(inode, UFS_IND_BLOCK, - ufs_get_direct_data_ptr(uspi, ufsi, UFS_IND_BLOCK)); - ufs_trunc_dindirect(inode, UFS_IND_BLOCK + uspi->s_apb, - ufs_get_direct_data_ptr(uspi, ufsi, UFS_DIND_BLOCK)); - ufs_trunc_tindirect(inode); - ufsi->i_lastfrag = DIRECT_FRAGMENT; - mutex_unlock(&ufsi->truncate_mutex); -} - -int ufs_truncate(struct inode *inode, loff_t size) -{ - int err = 0; - - UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n", - inode->i_ino, (unsigned long long)size, - (unsigned long long)i_size_read(inode)); - - if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || - S_ISLNK(inode->i_mode))) - return -EINVAL; - if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) - return -EPERM; - - err = ufs_alloc_lastblock(inode, size); - - if (err) - goto out; - - block_truncate_page(inode->i_mapping, size, ufs_getfrag_block); - - truncate_setsize(inode, size); - - __ufs_truncate_blocks(inode); - inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; - mark_inode_dirty(inode); -out: - UFSD("EXIT: err %d\n", err); - return err; -} - -void ufs_truncate_blocks(struct inode *inode) -{ - if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || - S_ISLNK(inode->i_mode))) - return; - if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) - return; - __ufs_truncate_blocks(inode); -} - -int ufs_setattr(struct dentry *dentry, struct iattr *attr) -{ - struct inode *inode = d_inode(dentry); - unsigned int ia_valid = attr->ia_valid; - int error; - - error = inode_change_ok(inode, attr); - if (error) - return error; - - if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) { - error = ufs_truncate(inode, attr->ia_size); - if (error) - return error; - } - - setattr_copy(inode, attr); - mark_inode_dirty(inode); - return 0; -} - -const struct inode_operations ufs_file_inode_operations = { - .setattr = ufs_setattr, -}; |