diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ufs/balloc.c | 48 | ||||
| -rw-r--r-- | fs/ufs/file.c | 4 | ||||
| -rw-r--r-- | fs/ufs/inode.c | 7 | ||||
| -rw-r--r-- | fs/ufs/truncate.c | 148 | ||||
| -rw-r--r-- | fs/ufs/util.c | 54 | ||||
| -rw-r--r-- | fs/ufs/util.h | 8 |
6 files changed, 204 insertions, 65 deletions
diff --git a/fs/ufs/balloc.c b/fs/ufs/balloc.c index 95b878e..b01804b 100644 --- a/fs/ufs/balloc.c +++ b/fs/ufs/balloc.c @@ -217,48 +217,6 @@ failed: return; } -static struct page *ufs_get_locked_page(struct address_space *mapping, - unsigned long index) -{ - struct page *page; - -try_again: - page = find_lock_page(mapping, index); - if (!page) { - page = read_cache_page(mapping, index, - (filler_t*)mapping->a_ops->readpage, - NULL); - if (IS_ERR(page)) { - printk(KERN_ERR "ufs_change_blocknr: " - "read_cache_page error: ino %lu, index: %lu\n", - mapping->host->i_ino, index); - goto out; - } - - lock_page(page); - - if (!PageUptodate(page) || PageError(page)) { - unlock_page(page); - page_cache_release(page); - - printk(KERN_ERR "ufs_change_blocknr: " - "can not read page: ino %lu, index: %lu\n", - mapping->host->i_ino, index); - - page = ERR_PTR(-EIO); - goto out; - } - } - - if (unlikely(!page->mapping || !page_has_buffers(page))) { - unlock_page(page); - page_cache_release(page); - goto try_again;/*we really need these buffers*/ - } -out: - return page; -} - /* * Modify inode page cache in such way: * have - blocks with b_blocknr equal to oldb...oldb+count-1 @@ -311,10 +269,8 @@ static void ufs_change_blocknr(struct inode *inode, unsigned int baseblk, set_page_dirty(page); - if (likely(cur_index != index)) { - unlock_page(page); - page_cache_release(page); - } + if (likely(cur_index != index)) + ufs_put_locked_page(page); } UFSD("EXIT\n"); } diff --git a/fs/ufs/file.c b/fs/ufs/file.c index 0e50015..a9c6e5f 100644 --- a/fs/ufs/file.c +++ b/fs/ufs/file.c @@ -60,7 +60,3 @@ const struct file_operations ufs_file_operations = { .fsync = ufs_sync_file, .sendfile = generic_file_sendfile, }; - -struct inode_operations ufs_file_inode_operations = { - .truncate = ufs_truncate, -}; diff --git a/fs/ufs/inode.c b/fs/ufs/inode.c index 488b5ff..e7c8615 100644 --- a/fs/ufs/inode.c +++ b/fs/ufs/inode.c @@ -843,14 +843,17 @@ int ufs_sync_inode (struct inode *inode) void ufs_delete_inode (struct inode * inode) { + loff_t old_i_size; + truncate_inode_pages(&inode->i_data, 0); /*UFS_I(inode)->i_dtime = CURRENT_TIME;*/ lock_kernel(); mark_inode_dirty(inode); ufs_update_inode(inode, IS_SYNC(inode)); + old_i_size = inode->i_size; inode->i_size = 0; - if (inode->i_blocks) - ufs_truncate (inode); + if (inode->i_blocks && ufs_truncate(inode, old_i_size)) + ufs_warning(inode->i_sb, __FUNCTION__, "ufs_truncate failed\n"); ufs_free_inode (inode); unlock_kernel(); } diff --git a/fs/ufs/truncate.c b/fs/ufs/truncate.c index 3c3b301..c9b5587 100644 --- a/fs/ufs/truncate.c +++ b/fs/ufs/truncate.c @@ -369,24 +369,97 @@ static int ufs_trunc_tindirect (struct inode * inode) UFSD("EXIT\n"); return retry; } - -void ufs_truncate (struct inode * inode) + +static int ufs_alloc_lastblock(struct inode *inode) { + int err = 0; + struct address_space *mapping = inode->i_mapping; + struct ufs_sb_private_info *uspi = UFS_SB(inode->i_sb)->s_uspi; struct ufs_inode_info *ufsi = UFS_I(inode); - struct super_block * sb; - struct ufs_sb_private_info * uspi; - int retry; + unsigned lastfrag, i, end; + struct page *lastpage; + struct buffer_head *bh; + + lastfrag = (i_size_read(inode) + uspi->s_fsize - 1) >> uspi->s_fshift; + + if (!lastfrag) { + ufsi->i_lastfrag = 0; + 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; + + if (!buffer_mapped(bh)) { + 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); + } + } +out_unlock: + ufs_put_locked_page(lastpage); +out: + return err; +} + +int ufs_truncate(struct inode *inode, loff_t old_i_size) +{ + 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; + int retry, err = 0; UFSD("ENTER\n"); - sb = inode->i_sb; - uspi = UFS_SB(sb)->s_uspi; - if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) - return; + 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; + return -EPERM; + + if (inode->i_size > old_i_size) { + /* + * if we expand file we should care about + * allocation of block for last byte first of all + */ + err = ufs_alloc_lastblock(inode); + + if (err) { + i_size_write(inode, old_i_size); + goto out; + } + /* + * go away, because of we expand file, and we do not + * need free blocks, and zeroizes page + */ + lock_kernel(); + goto almost_end; + } - block_truncate_page(inode->i_mapping, inode->i_size, ufs_getfrag_block); + block_truncate_page(inode->i_mapping, inode->i_size, ufs_getfrag_block); lock_kernel(); while (1) { @@ -404,9 +477,58 @@ void ufs_truncate (struct inode * inode) yield(); } + if (inode->i_size < old_i_size) { + /* + * now we should have enough space + * to allocate block for last byte + */ + err = ufs_alloc_lastblock(inode); + if (err) + /* + * looks like all the same - we have no space, + * but we truncate file already + */ + inode->i_size = (ufsi->i_lastfrag - 1) * uspi->s_fsize; + } +almost_end: inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; - ufsi->i_lastfrag = DIRECT_FRAGMENT; unlock_kernel(); mark_inode_dirty(inode); - UFSD("EXIT\n"); +out: + UFSD("EXIT: err %d\n", err); + return err; } + + +/* + * We don't define our `inode->i_op->truncate', and call it here, + * because of: + * - there is no way to know old size + * - there is no way inform user about error, if it happens in `truncate' + */ +static int ufs_setattr(struct dentry *dentry, struct iattr *attr) +{ + struct inode *inode = dentry->d_inode; + 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 != i_size_read(inode)) { + loff_t old_i_size = inode->i_size; + error = vmtruncate(inode, attr->ia_size); + if (error) + return error; + error = ufs_truncate(inode, old_i_size); + if (error) + return error; + } + return inode_setattr(inode, attr); +} + +struct inode_operations ufs_file_inode_operations = { + .setattr = ufs_setattr, +}; diff --git a/fs/ufs/util.c b/fs/ufs/util.c index a2f13f4..337cf2c 100644 --- a/fs/ufs/util.c +++ b/fs/ufs/util.c @@ -233,3 +233,57 @@ ufs_set_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi, dev_t dev else ufsi->i_u1.i_data[0] = 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 page *page; + +try_again: + page = find_lock_page(mapping, index); + if (!page) { + page = read_cache_page(mapping, index, + (filler_t*)mapping->a_ops->readpage, + NULL); + if (IS_ERR(page)) { + printk(KERN_ERR "ufs_change_blocknr: " + "read_cache_page error: ino %lu, index: %lu\n", + mapping->host->i_ino, index); + goto out; + } + + lock_page(page); + + if (!PageUptodate(page) || PageError(page)) { + unlock_page(page); + page_cache_release(page); + + printk(KERN_ERR "ufs_change_blocknr: " + "can not read page: ino %lu, index: %lu\n", + mapping->host->i_ino, index); + + page = ERR_PTR(-EIO); + goto out; + } + } + + if (unlikely(!page->mapping || !page_has_buffers(page))) { + unlock_page(page); + page_cache_release(page); + goto try_again;/*we really need these buffers*/ + } +out: + return page; +} diff --git a/fs/ufs/util.h b/fs/ufs/util.h index 406981f..28fce6c 100644 --- a/fs/ufs/util.h +++ b/fs/ufs/util.h @@ -251,6 +251,14 @@ extern void _ubh_ubhcpymem_(struct ufs_sb_private_info *, unsigned char *, struc #define ubh_memcpyubh(ubh,mem,size) _ubh_memcpyubh_(uspi,ubh,mem,size) extern void _ubh_memcpyubh_(struct ufs_sb_private_info *, struct ufs_buffer_head *, unsigned char *, unsigned); +/* This functions works with cache pages*/ +extern struct page *ufs_get_locked_page(struct address_space *mapping, + pgoff_t index); +static inline void ufs_put_locked_page(struct page *page) +{ + unlock_page(page); + page_cache_release(page); +} /* |
