From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- fs/jfs/inode.c | 419 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 419 insertions(+) create mode 100644 fs/jfs/inode.c (limited to 'fs/jfs/inode.c') diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c new file mode 100644 index 000000000..d1ec920aa --- /dev/null +++ b/fs/jfs/inode.c @@ -0,0 +1,419 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) International Business Machines Corp., 2000-2004 + * Portions Copyright (C) Christoph Hellwig, 2001-2002 + */ + +#include +#include +#include +#include +#include +#include +#include +#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" +#include "jfs_dmap.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_nohighmem(inode); + inode->i_mapping->a_ops = &jfs_aops; + } else { + inode->i_op = &jfs_fast_symlink_inode_operations; + inode->i_link = JFS_IP(inode)->i_inline; + /* + * The inline data should be null-terminated, but + * don't let on-disk corruption crash the kernel + */ + inode->i_link[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) +{ + struct jfs_inode_info *ji = JFS_IP(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) { + struct inode *ipimap = JFS_SBI(inode->i_sb)->ipimap; + truncate_inode_pages_final(&inode->i_data); + + if (test_cflag(COMMIT_Freewmap, inode)) + jfs_free_zero_link(inode); + + if (ipimap && JFS_IP(ipimap)->i_imap) + diFree(inode); + + /* + * Free the inode from the quota allocation. + */ + dquot_free_inode(inode); + } + } else { + truncate_inode_pages_final(&inode->i_data); + } + clear_inode(inode); + dquot_drop(inode); + + BUG_ON(!list_empty(&ji->anon_inode_list)); + + spin_lock_irq(&ji->ag_lock); + if (ji->active_ag != -1) { + struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; + atomic_dec(&bmap->db_active[ji->active_ag]); + ji->active_ag = -1; + } + spin_unlock_irq(&ji->ag_lock); +} + +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; + XADoffset(&xad, lblock64); + XADlength(&xad, xlen); + XADaddress(&xad, xaddr); + 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 + */ + 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; + + 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_read_folio(struct file *file, struct folio *folio) +{ + return mpage_read_folio(folio, jfs_get_block); +} + +static void jfs_readahead(struct readahead_control *rac) +{ + mpage_readahead(rac, 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, + struct page **pagep, void **fsdata) +{ + int ret; + + ret = block_write_begin(mapping, pos, len, pagep, jfs_get_block); + if (unlikely(ret)) + jfs_write_failed(mapping, pos + len); + + return ret; +} + +static int jfs_write_end(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, struct page *page, + void *fsdata) +{ + int ret; + + ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); + if (ret < len) + 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(struct kiocb *iocb, struct iov_iter *iter) +{ + 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, 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 = iocb->ki_pos + count; + + if (end > isize) + jfs_write_failed(mapping, end); + } + + return ret; +} + +const struct address_space_operations jfs_aops = { + .dirty_folio = block_dirty_folio, + .invalidate_folio = block_invalidate_folio, + .read_folio = jfs_read_folio, + .readahead = jfs_readahead, + .writepage = jfs_writepage, + .writepages = jfs_writepages, + .write_begin = jfs_write_begin, + .write_end = jfs_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(ip); + 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); + + block_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); +} -- cgit v1.2.3