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424 lines
9.8 KiB
424 lines
9.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) International Business Machines Corp., 2000-2004 |
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* Portions Copyright (C) Christoph Hellwig, 2001-2002 |
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*/ |
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#include <linux/fs.h> |
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#include <linux/mpage.h> |
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#include <linux/buffer_head.h> |
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#include <linux/pagemap.h> |
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#include <linux/quotaops.h> |
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#include <linux/uio.h> |
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#include <linux/writeback.h> |
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#include "jfs_incore.h" |
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#include "jfs_inode.h" |
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#include "jfs_filsys.h" |
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#include "jfs_imap.h" |
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#include "jfs_extent.h" |
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#include "jfs_unicode.h" |
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#include "jfs_debug.h" |
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#include "jfs_dmap.h" |
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struct inode *jfs_iget(struct super_block *sb, unsigned long ino) |
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{ |
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struct inode *inode; |
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int ret; |
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inode = iget_locked(sb, ino); |
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if (!inode) |
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return ERR_PTR(-ENOMEM); |
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if (!(inode->i_state & I_NEW)) |
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return inode; |
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ret = diRead(inode); |
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if (ret < 0) { |
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iget_failed(inode); |
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return ERR_PTR(ret); |
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} |
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if (S_ISREG(inode->i_mode)) { |
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inode->i_op = &jfs_file_inode_operations; |
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inode->i_fop = &jfs_file_operations; |
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inode->i_mapping->a_ops = &jfs_aops; |
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} else if (S_ISDIR(inode->i_mode)) { |
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inode->i_op = &jfs_dir_inode_operations; |
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inode->i_fop = &jfs_dir_operations; |
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} else if (S_ISLNK(inode->i_mode)) { |
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if (inode->i_size >= IDATASIZE) { |
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inode->i_op = &page_symlink_inode_operations; |
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inode_nohighmem(inode); |
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inode->i_mapping->a_ops = &jfs_aops; |
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} else { |
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inode->i_op = &jfs_fast_symlink_inode_operations; |
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inode->i_link = JFS_IP(inode)->i_inline; |
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/* |
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* The inline data should be null-terminated, but |
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* don't let on-disk corruption crash the kernel |
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*/ |
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inode->i_link[inode->i_size] = '\0'; |
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} |
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} else { |
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inode->i_op = &jfs_file_inode_operations; |
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init_special_inode(inode, inode->i_mode, inode->i_rdev); |
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} |
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unlock_new_inode(inode); |
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return inode; |
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} |
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/* |
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* Workhorse of both fsync & write_inode |
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*/ |
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int jfs_commit_inode(struct inode *inode, int wait) |
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{ |
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int rc = 0; |
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tid_t tid; |
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static int noisy = 5; |
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jfs_info("In jfs_commit_inode, inode = 0x%p", inode); |
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/* |
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* Don't commit if inode has been committed since last being |
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* marked dirty, or if it has been deleted. |
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*/ |
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if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode)) |
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return 0; |
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if (isReadOnly(inode)) { |
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/* kernel allows writes to devices on read-only |
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* partitions and may think inode is dirty |
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*/ |
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if (!special_file(inode->i_mode) && noisy) { |
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jfs_err("jfs_commit_inode(0x%p) called on read-only volume", |
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inode); |
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jfs_err("Is remount racy?"); |
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noisy--; |
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} |
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return 0; |
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} |
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tid = txBegin(inode->i_sb, COMMIT_INODE); |
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mutex_lock(&JFS_IP(inode)->commit_mutex); |
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/* |
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* Retest inode state after taking commit_mutex |
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*/ |
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if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode)) |
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rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0); |
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txEnd(tid); |
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mutex_unlock(&JFS_IP(inode)->commit_mutex); |
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return rc; |
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} |
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int jfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
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{ |
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int wait = wbc->sync_mode == WB_SYNC_ALL; |
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if (inode->i_nlink == 0) |
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return 0; |
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/* |
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* If COMMIT_DIRTY is not set, the inode isn't really dirty. |
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* It has been committed since the last change, but was still |
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* on the dirty inode list. |
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*/ |
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if (!test_cflag(COMMIT_Dirty, inode)) { |
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/* Make sure committed changes hit the disk */ |
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jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait); |
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return 0; |
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} |
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if (jfs_commit_inode(inode, wait)) { |
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jfs_err("jfs_write_inode: jfs_commit_inode failed!"); |
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return -EIO; |
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} else |
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return 0; |
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} |
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void jfs_evict_inode(struct inode *inode) |
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{ |
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struct jfs_inode_info *ji = JFS_IP(inode); |
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jfs_info("In jfs_evict_inode, inode = 0x%p", inode); |
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if (!inode->i_nlink && !is_bad_inode(inode)) { |
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dquot_initialize(inode); |
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if (JFS_IP(inode)->fileset == FILESYSTEM_I) { |
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truncate_inode_pages_final(&inode->i_data); |
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if (test_cflag(COMMIT_Freewmap, inode)) |
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jfs_free_zero_link(inode); |
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if (JFS_SBI(inode->i_sb)->ipimap) |
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diFree(inode); |
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/* |
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* Free the inode from the quota allocation. |
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*/ |
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dquot_free_inode(inode); |
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} |
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} else { |
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truncate_inode_pages_final(&inode->i_data); |
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} |
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clear_inode(inode); |
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dquot_drop(inode); |
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BUG_ON(!list_empty(&ji->anon_inode_list)); |
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spin_lock_irq(&ji->ag_lock); |
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if (ji->active_ag != -1) { |
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struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; |
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atomic_dec(&bmap->db_active[ji->active_ag]); |
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ji->active_ag = -1; |
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} |
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spin_unlock_irq(&ji->ag_lock); |
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} |
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void jfs_dirty_inode(struct inode *inode, int flags) |
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{ |
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static int noisy = 5; |
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if (isReadOnly(inode)) { |
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if (!special_file(inode->i_mode) && noisy) { |
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/* kernel allows writes to devices on read-only |
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* partitions and may try to mark inode dirty |
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*/ |
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jfs_err("jfs_dirty_inode called on read-only volume"); |
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jfs_err("Is remount racy?"); |
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noisy--; |
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} |
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return; |
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} |
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set_cflag(COMMIT_Dirty, inode); |
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} |
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int jfs_get_block(struct inode *ip, sector_t lblock, |
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struct buffer_head *bh_result, int create) |
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{ |
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s64 lblock64 = lblock; |
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int rc = 0; |
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xad_t xad; |
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s64 xaddr; |
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int xflag; |
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s32 xlen = bh_result->b_size >> ip->i_blkbits; |
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/* |
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* Take appropriate lock on inode |
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*/ |
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if (create) |
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IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
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else |
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IREAD_LOCK(ip, RDWRLOCK_NORMAL); |
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if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) && |
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(!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) && |
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xaddr) { |
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if (xflag & XAD_NOTRECORDED) { |
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if (!create) |
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/* |
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* Allocated but not recorded, read treats |
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* this as a hole |
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*/ |
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goto unlock; |
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#ifdef _JFS_4K |
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XADoffset(&xad, lblock64); |
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XADlength(&xad, xlen); |
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XADaddress(&xad, xaddr); |
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#else /* _JFS_4K */ |
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/* |
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* As long as block size = 4K, this isn't a problem. |
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* We should mark the whole page not ABNR, but how |
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* will we know to mark the other blocks BH_New? |
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*/ |
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BUG(); |
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#endif /* _JFS_4K */ |
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rc = extRecord(ip, &xad); |
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if (rc) |
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goto unlock; |
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set_buffer_new(bh_result); |
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} |
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map_bh(bh_result, ip->i_sb, xaddr); |
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bh_result->b_size = xlen << ip->i_blkbits; |
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goto unlock; |
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} |
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if (!create) |
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goto unlock; |
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/* |
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* Allocate a new block |
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*/ |
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#ifdef _JFS_4K |
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if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad))) |
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goto unlock; |
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rc = extAlloc(ip, xlen, lblock64, &xad, false); |
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if (rc) |
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goto unlock; |
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set_buffer_new(bh_result); |
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map_bh(bh_result, ip->i_sb, addressXAD(&xad)); |
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bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits; |
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#else /* _JFS_4K */ |
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/* |
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* We need to do whatever it takes to keep all but the last buffers |
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* in 4K pages - see jfs_write.c |
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*/ |
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BUG(); |
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#endif /* _JFS_4K */ |
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unlock: |
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/* |
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* Release lock on inode |
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*/ |
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if (create) |
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IWRITE_UNLOCK(ip); |
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else |
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IREAD_UNLOCK(ip); |
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return rc; |
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} |
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static int jfs_writepage(struct page *page, struct writeback_control *wbc) |
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{ |
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return block_write_full_page(page, jfs_get_block, wbc); |
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} |
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static int jfs_writepages(struct address_space *mapping, |
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struct writeback_control *wbc) |
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{ |
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return mpage_writepages(mapping, wbc, jfs_get_block); |
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} |
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static int jfs_readpage(struct file *file, struct page *page) |
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{ |
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return mpage_readpage(page, jfs_get_block); |
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} |
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static void jfs_readahead(struct readahead_control *rac) |
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{ |
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mpage_readahead(rac, jfs_get_block); |
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} |
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static void jfs_write_failed(struct address_space *mapping, loff_t to) |
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{ |
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struct inode *inode = mapping->host; |
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if (to > inode->i_size) { |
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truncate_pagecache(inode, inode->i_size); |
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jfs_truncate(inode); |
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} |
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} |
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static int jfs_write_begin(struct file *file, struct address_space *mapping, |
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loff_t pos, unsigned len, unsigned flags, |
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struct page **pagep, void **fsdata) |
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{ |
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int ret; |
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ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata, |
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jfs_get_block); |
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if (unlikely(ret)) |
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jfs_write_failed(mapping, pos + len); |
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return ret; |
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} |
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static sector_t jfs_bmap(struct address_space *mapping, sector_t block) |
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{ |
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return generic_block_bmap(mapping, block, jfs_get_block); |
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} |
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static ssize_t jfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) |
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{ |
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struct file *file = iocb->ki_filp; |
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struct address_space *mapping = file->f_mapping; |
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struct inode *inode = file->f_mapping->host; |
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size_t count = iov_iter_count(iter); |
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ssize_t ret; |
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ret = blockdev_direct_IO(iocb, inode, iter, jfs_get_block); |
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/* |
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* In case of error extending write may have instantiated a few |
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* blocks outside i_size. Trim these off again. |
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*/ |
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if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) { |
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loff_t isize = i_size_read(inode); |
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loff_t end = iocb->ki_pos + count; |
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if (end > isize) |
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jfs_write_failed(mapping, end); |
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} |
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return ret; |
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} |
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const struct address_space_operations jfs_aops = { |
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.set_page_dirty = __set_page_dirty_buffers, |
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.readpage = jfs_readpage, |
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.readahead = jfs_readahead, |
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.writepage = jfs_writepage, |
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.writepages = jfs_writepages, |
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.write_begin = jfs_write_begin, |
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.write_end = nobh_write_end, |
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.bmap = jfs_bmap, |
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.direct_IO = jfs_direct_IO, |
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}; |
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/* |
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* Guts of jfs_truncate. Called with locks already held. Can be called |
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* with directory for truncating directory index table. |
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*/ |
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void jfs_truncate_nolock(struct inode *ip, loff_t length) |
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{ |
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loff_t newsize; |
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tid_t tid; |
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ASSERT(length >= 0); |
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if (test_cflag(COMMIT_Nolink, ip)) { |
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xtTruncate(0, ip, length, COMMIT_WMAP); |
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return; |
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} |
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do { |
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tid = txBegin(ip->i_sb, 0); |
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/* |
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* The commit_mutex cannot be taken before txBegin. |
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* txBegin may block and there is a chance the inode |
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* could be marked dirty and need to be committed |
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* before txBegin unblocks |
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*/ |
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mutex_lock(&JFS_IP(ip)->commit_mutex); |
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newsize = xtTruncate(tid, ip, length, |
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COMMIT_TRUNCATE | COMMIT_PWMAP); |
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if (newsize < 0) { |
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txEnd(tid); |
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mutex_unlock(&JFS_IP(ip)->commit_mutex); |
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break; |
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} |
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ip->i_mtime = ip->i_ctime = current_time(ip); |
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mark_inode_dirty(ip); |
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txCommit(tid, 1, &ip, 0); |
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txEnd(tid); |
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mutex_unlock(&JFS_IP(ip)->commit_mutex); |
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} while (newsize > length); /* Truncate isn't always atomic */ |
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} |
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void jfs_truncate(struct inode *ip) |
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{ |
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jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size); |
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nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block); |
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IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
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jfs_truncate_nolock(ip, ip->i_size); |
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IWRITE_UNLOCK(ip); |
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}
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