| /* |
| * Copyright (C) International Business Machines Corp., 2000-2004 |
| * Portions Copyright (C) Christoph Hellwig, 2001-2002 |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| * the GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #include <linux/fs.h> |
| #include <linux/mpage.h> |
| #include <linux/buffer_head.h> |
| #include <linux/pagemap.h> |
| #include <linux/quotaops.h> |
| #include <linux/uio.h> |
| #include <linux/writeback.h> |
| #include "jfs_incore.h" |
| #include "jfs_inode.h" |
| #include "jfs_filsys.h" |
| #include "jfs_imap.h" |
| #include "jfs_extent.h" |
| #include "jfs_unicode.h" |
| #include "jfs_debug.h" |
| |
| |
| struct inode *jfs_iget(struct super_block *sb, unsigned long ino) |
| { |
| struct inode *inode; |
| int ret; |
| |
| inode = iget_locked(sb, ino); |
| if (!inode) |
| return ERR_PTR(-ENOMEM); |
| if (!(inode->i_state & I_NEW)) |
| return inode; |
| |
| ret = diRead(inode); |
| if (ret < 0) { |
| iget_failed(inode); |
| return ERR_PTR(ret); |
| } |
| |
| if (S_ISREG(inode->i_mode)) { |
| inode->i_op = &jfs_file_inode_operations; |
| inode->i_fop = &jfs_file_operations; |
| inode->i_mapping->a_ops = &jfs_aops; |
| } else if (S_ISDIR(inode->i_mode)) { |
| inode->i_op = &jfs_dir_inode_operations; |
| inode->i_fop = &jfs_dir_operations; |
| } else if (S_ISLNK(inode->i_mode)) { |
| if (inode->i_size >= IDATASIZE) { |
| inode->i_op = &page_symlink_inode_operations; |
| inode->i_mapping->a_ops = &jfs_aops; |
| } else { |
| inode->i_op = &jfs_fast_symlink_inode_operations; |
| /* |
| * The inline data should be null-terminated, but |
| * don't let on-disk corruption crash the kernel |
| */ |
| JFS_IP(inode)->i_inline[inode->i_size] = '\0'; |
| } |
| } else { |
| inode->i_op = &jfs_file_inode_operations; |
| init_special_inode(inode, inode->i_mode, inode->i_rdev); |
| } |
| unlock_new_inode(inode); |
| return inode; |
| } |
| |
| /* |
| * Workhorse of both fsync & write_inode |
| */ |
| int jfs_commit_inode(struct inode *inode, int wait) |
| { |
| int rc = 0; |
| tid_t tid; |
| static int noisy = 5; |
| |
| jfs_info("In jfs_commit_inode, inode = 0x%p", inode); |
| |
| /* |
| * Don't commit if inode has been committed since last being |
| * marked dirty, or if it has been deleted. |
| */ |
| if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode)) |
| return 0; |
| |
| if (isReadOnly(inode)) { |
| /* kernel allows writes to devices on read-only |
| * partitions and may think inode is dirty |
| */ |
| if (!special_file(inode->i_mode) && noisy) { |
| jfs_err("jfs_commit_inode(0x%p) called on " |
| "read-only volume", inode); |
| jfs_err("Is remount racy?"); |
| noisy--; |
| } |
| return 0; |
| } |
| |
| tid = txBegin(inode->i_sb, COMMIT_INODE); |
| mutex_lock(&JFS_IP(inode)->commit_mutex); |
| |
| /* |
| * Retest inode state after taking commit_mutex |
| */ |
| if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode)) |
| rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0); |
| |
| txEnd(tid); |
| mutex_unlock(&JFS_IP(inode)->commit_mutex); |
| return rc; |
| } |
| |
| int jfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
| { |
| int wait = wbc->sync_mode == WB_SYNC_ALL; |
| |
| if (inode->i_nlink == 0) |
| return 0; |
| /* |
| * If COMMIT_DIRTY is not set, the inode isn't really dirty. |
| * It has been committed since the last change, but was still |
| * on the dirty inode list. |
| */ |
| if (!test_cflag(COMMIT_Dirty, inode)) { |
| /* Make sure committed changes hit the disk */ |
| jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait); |
| return 0; |
| } |
| |
| if (jfs_commit_inode(inode, wait)) { |
| jfs_err("jfs_write_inode: jfs_commit_inode failed!"); |
| return -EIO; |
| } else |
| return 0; |
| } |
| |
| void jfs_evict_inode(struct inode *inode) |
| { |
| jfs_info("In jfs_evict_inode, inode = 0x%p", inode); |
| |
| if (!inode->i_nlink && !is_bad_inode(inode)) { |
| dquot_initialize(inode); |
| |
| if (JFS_IP(inode)->fileset == FILESYSTEM_I) { |
| truncate_inode_pages_final(&inode->i_data); |
| |
| if (test_cflag(COMMIT_Freewmap, inode)) |
| jfs_free_zero_link(inode); |
| |
| diFree(inode); |
| |
| /* |
| * Free the inode from the quota allocation. |
| */ |
| dquot_initialize(inode); |
| dquot_free_inode(inode); |
| } |
| } else { |
| truncate_inode_pages_final(&inode->i_data); |
| } |
| clear_inode(inode); |
| dquot_drop(inode); |
| } |
| |
| void jfs_dirty_inode(struct inode *inode, int flags) |
| { |
| static int noisy = 5; |
| |
| if (isReadOnly(inode)) { |
| if (!special_file(inode->i_mode) && noisy) { |
| /* kernel allows writes to devices on read-only |
| * partitions and may try to mark inode dirty |
| */ |
| jfs_err("jfs_dirty_inode called on read-only volume"); |
| jfs_err("Is remount racy?"); |
| noisy--; |
| } |
| return; |
| } |
| |
| set_cflag(COMMIT_Dirty, inode); |
| } |
| |
| int jfs_get_block(struct inode *ip, sector_t lblock, |
| struct buffer_head *bh_result, int create) |
| { |
| s64 lblock64 = lblock; |
| int rc = 0; |
| xad_t xad; |
| s64 xaddr; |
| int xflag; |
| s32 xlen = bh_result->b_size >> ip->i_blkbits; |
| |
| /* |
| * Take appropriate lock on inode |
| */ |
| if (create) |
| IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
| else |
| IREAD_LOCK(ip, RDWRLOCK_NORMAL); |
| |
| if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) && |
| (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) && |
| xaddr) { |
| if (xflag & XAD_NOTRECORDED) { |
| if (!create) |
| /* |
| * Allocated but not recorded, read treats |
| * this as a hole |
| */ |
| goto unlock; |
| #ifdef _JFS_4K |
| XADoffset(&xad, lblock64); |
| XADlength(&xad, xlen); |
| XADaddress(&xad, xaddr); |
| #else /* _JFS_4K */ |
| /* |
| * As long as block size = 4K, this isn't a problem. |
| * We should mark the whole page not ABNR, but how |
| * will we know to mark the other blocks BH_New? |
| */ |
| BUG(); |
| #endif /* _JFS_4K */ |
| rc = extRecord(ip, &xad); |
| if (rc) |
| goto unlock; |
| set_buffer_new(bh_result); |
| } |
| |
| map_bh(bh_result, ip->i_sb, xaddr); |
| bh_result->b_size = xlen << ip->i_blkbits; |
| goto unlock; |
| } |
| if (!create) |
| goto unlock; |
| |
| /* |
| * Allocate a new block |
| */ |
| #ifdef _JFS_4K |
| if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad))) |
| goto unlock; |
| rc = extAlloc(ip, xlen, lblock64, &xad, false); |
| if (rc) |
| goto unlock; |
| |
| set_buffer_new(bh_result); |
| map_bh(bh_result, ip->i_sb, addressXAD(&xad)); |
| bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits; |
| |
| #else /* _JFS_4K */ |
| /* |
| * We need to do whatever it takes to keep all but the last buffers |
| * in 4K pages - see jfs_write.c |
| */ |
| BUG(); |
| #endif /* _JFS_4K */ |
| |
| unlock: |
| /* |
| * Release lock on inode |
| */ |
| if (create) |
| IWRITE_UNLOCK(ip); |
| else |
| IREAD_UNLOCK(ip); |
| return rc; |
| } |
| |
| static int jfs_writepage(struct page *page, struct writeback_control *wbc) |
| { |
| return block_write_full_page(page, jfs_get_block, wbc); |
| } |
| |
| static int jfs_writepages(struct address_space *mapping, |
| struct writeback_control *wbc) |
| { |
| return mpage_writepages(mapping, wbc, jfs_get_block); |
| } |
| |
| static int jfs_readpage(struct file *file, struct page *page) |
| { |
| return mpage_readpage(page, jfs_get_block); |
| } |
| |
| static int jfs_readpages(struct file *file, struct address_space *mapping, |
| struct list_head *pages, unsigned nr_pages) |
| { |
| return mpage_readpages(mapping, pages, nr_pages, jfs_get_block); |
| } |
| |
| static void jfs_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); |
| jfs_truncate(inode); |
| } |
| } |
| |
| static int jfs_write_begin(struct file *file, struct address_space *mapping, |
| loff_t pos, unsigned len, unsigned flags, |
| struct page **pagep, void **fsdata) |
| { |
| int ret; |
| |
| ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata, |
| jfs_get_block); |
| if (unlikely(ret)) |
| jfs_write_failed(mapping, pos + len); |
| |
| return ret; |
| } |
| |
| static sector_t jfs_bmap(struct address_space *mapping, sector_t block) |
| { |
| return generic_block_bmap(mapping, block, jfs_get_block); |
| } |
| |
| static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb, |
| struct iov_iter *iter, loff_t offset) |
| { |
| struct file *file = iocb->ki_filp; |
| struct address_space *mapping = file->f_mapping; |
| struct inode *inode = file->f_mapping->host; |
| size_t count = iov_iter_count(iter); |
| ssize_t ret; |
| |
| ret = blockdev_direct_IO(iocb, inode, iter, offset, jfs_get_block); |
| |
| /* |
| * In case of error extending write may have instantiated a few |
| * blocks outside i_size. Trim these off again. |
| */ |
| if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) { |
| loff_t isize = i_size_read(inode); |
| loff_t end = offset + count; |
| |
| if (end > isize) |
| jfs_write_failed(mapping, end); |
| } |
| |
| return ret; |
| } |
| |
| const struct address_space_operations jfs_aops = { |
| .readpage = jfs_readpage, |
| .readpages = jfs_readpages, |
| .writepage = jfs_writepage, |
| .writepages = jfs_writepages, |
| .write_begin = jfs_write_begin, |
| .write_end = nobh_write_end, |
| .bmap = jfs_bmap, |
| .direct_IO = jfs_direct_IO, |
| }; |
| |
| /* |
| * Guts of jfs_truncate. Called with locks already held. Can be called |
| * with directory for truncating directory index table. |
| */ |
| void jfs_truncate_nolock(struct inode *ip, loff_t length) |
| { |
| loff_t newsize; |
| tid_t tid; |
| |
| ASSERT(length >= 0); |
| |
| if (test_cflag(COMMIT_Nolink, ip)) { |
| xtTruncate(0, ip, length, COMMIT_WMAP); |
| return; |
| } |
| |
| do { |
| tid = txBegin(ip->i_sb, 0); |
| |
| /* |
| * The commit_mutex cannot be taken before txBegin. |
| * txBegin may block and there is a chance the inode |
| * could be marked dirty and need to be committed |
| * before txBegin unblocks |
| */ |
| mutex_lock(&JFS_IP(ip)->commit_mutex); |
| |
| newsize = xtTruncate(tid, ip, length, |
| COMMIT_TRUNCATE | COMMIT_PWMAP); |
| if (newsize < 0) { |
| txEnd(tid); |
| mutex_unlock(&JFS_IP(ip)->commit_mutex); |
| break; |
| } |
| |
| ip->i_mtime = ip->i_ctime = CURRENT_TIME; |
| mark_inode_dirty(ip); |
| |
| txCommit(tid, 1, &ip, 0); |
| txEnd(tid); |
| mutex_unlock(&JFS_IP(ip)->commit_mutex); |
| } while (newsize > length); /* Truncate isn't always atomic */ |
| } |
| |
| void jfs_truncate(struct inode *ip) |
| { |
| jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size); |
| |
| nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block); |
| |
| IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
| jfs_truncate_nolock(ip, ip->i_size); |
| IWRITE_UNLOCK(ip); |
| } |