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nilfs2: avoid double error caused by nilfs_transaction_end
Pekka Enberg pointed out that double error handlings found after nilfs_transaction_end() can be avoided by separating abort operation: OK, I don't understand this. The only way nilfs_transaction_end() can fail is if we have NILFS_TI_SYNC set and we fail to construct the segment. But why do we want to construct a segment if we don't commit? I guess what I'm asking is why don't we have a separate nilfs_transaction_abort() function that can't fail for the erroneous case to avoid this double error value tracking thing? This does the separation and renames nilfs_transaction_end() to nilfs_transaction_commit() for clarification. Since, some calls of these functions were used just for exclusion control against the segment constructor, they are replaced with semaphore operations. Acked-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ryusuke Konishi
Linus Torvalds
parent
a2e7d2df82
commit
47420c7998
@ -77,7 +77,6 @@ int nilfs_get_block(struct inode *inode, sector_t blkoff,
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goto out;
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err = nilfs_bmap_insert(ii->i_bmap, (unsigned long)blkoff,
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(unsigned long)bh_result);
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nilfs_transaction_end(inode->i_sb, !err);
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if (unlikely(err != 0)) {
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if (err == -EEXIST) {
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/*
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@ -100,8 +99,10 @@ int nilfs_get_block(struct inode *inode, sector_t blkoff,
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inode->i_ino);
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err = -EIO;
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}
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nilfs_transaction_abort(inode->i_sb);
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goto out;
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}
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nilfs_transaction_commit(inode->i_sb); /* never fails */
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/* Error handling should be detailed */
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set_buffer_new(bh_result);
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map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed
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@ -203,7 +204,7 @@ static int nilfs_write_begin(struct file *file, struct address_space *mapping,
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err = block_write_begin(file, mapping, pos, len, flags, pagep,
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fsdata, nilfs_get_block);
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if (unlikely(err))
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nilfs_transaction_end(inode->i_sb, 0);
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nilfs_transaction_abort(inode->i_sb);
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return err;
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}
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@ -221,7 +222,7 @@ static int nilfs_write_end(struct file *file, struct address_space *mapping,
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copied = generic_write_end(file, mapping, pos, len, copied, page,
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fsdata);
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nilfs_set_file_dirty(NILFS_SB(inode->i_sb), inode, nr_dirty);
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err = nilfs_transaction_end(inode->i_sb, 1);
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err = nilfs_transaction_commit(inode->i_sb);
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return err ? : copied;
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}
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@ -641,7 +642,7 @@ void nilfs_truncate(struct inode *inode)
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nilfs_set_transaction_flag(NILFS_TI_SYNC);
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nilfs_set_file_dirty(NILFS_SB(sb), inode, 0);
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nilfs_transaction_end(sb, 1);
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nilfs_transaction_commit(sb);
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/* May construct a logical segment and may fail in sync mode.
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But truncate has no return value. */
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}
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@ -669,7 +670,7 @@ void nilfs_delete_inode(struct inode *inode)
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/* nilfs_free_inode() marks inode buffer dirty */
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if (IS_SYNC(inode))
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nilfs_set_transaction_flag(NILFS_TI_SYNC);
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nilfs_transaction_end(sb, 1);
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nilfs_transaction_commit(sb);
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/* May construct a logical segment and may fail in sync mode.
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But delete_inode has no return value. */
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}
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@ -679,7 +680,7 @@ int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
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struct nilfs_transaction_info ti;
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struct inode *inode = dentry->d_inode;
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struct super_block *sb = inode->i_sb;
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int err, err2;
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int err;
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err = inode_change_ok(inode, iattr);
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if (err)
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@ -691,8 +692,12 @@ int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
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err = inode_setattr(inode, iattr);
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if (!err && (iattr->ia_valid & ATTR_MODE))
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err = nilfs_acl_chmod(inode);
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err2 = nilfs_transaction_end(sb, 1);
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return err ? : err2;
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if (likely(!err))
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err = nilfs_transaction_commit(sb);
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else
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nilfs_transaction_abort(sb);
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return err;
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}
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int nilfs_load_inode_block(struct nilfs_sb_info *sbi, struct inode *inode,
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@ -817,5 +822,5 @@ void nilfs_dirty_inode(struct inode *inode)
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nilfs_transaction_begin(inode->i_sb, &ti, 0);
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if (likely(inode->i_ino != NILFS_SKETCH_INO))
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nilfs_mark_inode_dirty(inode);
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nilfs_transaction_end(inode->i_sb, 1); /* never fails */
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nilfs_transaction_commit(inode->i_sb); /* never fails */
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}
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@ -105,7 +105,11 @@ static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
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nilfs_transaction_begin(inode->i_sb, &ti, 0);
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ret = nilfs_cpfile_change_cpmode(
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cpfile, cpmode.cm_cno, cpmode.cm_mode);
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nilfs_transaction_end(inode->i_sb, !ret);
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if (unlikely(ret < 0)) {
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nilfs_transaction_abort(inode->i_sb);
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return ret;
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}
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nilfs_transaction_commit(inode->i_sb); /* never fails */
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return ret;
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}
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@ -125,7 +129,11 @@ nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
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nilfs_transaction_begin(inode->i_sb, &ti, 0);
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ret = nilfs_cpfile_delete_checkpoint(cpfile, cno);
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nilfs_transaction_end(inode->i_sb, !ret);
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if (unlikely(ret < 0)) {
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nilfs_transaction_abort(inode->i_sb);
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return ret;
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}
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nilfs_transaction_commit(inode->i_sb); /* never fails */
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return ret;
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}
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@ -142,16 +150,17 @@ static int nilfs_ioctl_get_cpinfo(struct inode *inode, struct file *filp,
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{
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struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
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struct nilfs_argv argv;
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struct nilfs_transaction_info ti;
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int ret;
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if (copy_from_user(&argv, argp, sizeof(argv)))
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return -EFAULT;
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nilfs_transaction_begin(inode->i_sb, &ti, 0);
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down_read(&nilfs->ns_segctor_sem);
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ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
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nilfs_ioctl_do_get_cpinfo);
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nilfs_transaction_end(inode->i_sb, 0);
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up_read(&nilfs->ns_segctor_sem);
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if (ret < 0)
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return ret;
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if (copy_to_user(argp, &argv, sizeof(argv)))
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ret = -EFAULT;
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@ -161,14 +170,13 @@ static int nilfs_ioctl_get_cpinfo(struct inode *inode, struct file *filp,
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static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
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unsigned int cmd, void __user *argp)
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{
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struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
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struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
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struct nilfs_cpstat cpstat;
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struct nilfs_transaction_info ti;
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int ret;
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nilfs_transaction_begin(inode->i_sb, &ti, 0);
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ret = nilfs_cpfile_get_stat(cpfile, &cpstat);
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nilfs_transaction_end(inode->i_sb, 0);
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down_read(&nilfs->ns_segctor_sem);
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ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
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up_read(&nilfs->ns_segctor_sem);
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if (ret < 0)
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return ret;
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@ -189,16 +197,17 @@ static int nilfs_ioctl_get_suinfo(struct inode *inode, struct file *filp,
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{
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struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
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struct nilfs_argv argv;
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struct nilfs_transaction_info ti;
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int ret;
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if (copy_from_user(&argv, argp, sizeof(argv)))
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return -EFAULT;
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nilfs_transaction_begin(inode->i_sb, &ti, 0);
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down_read(&nilfs->ns_segctor_sem);
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ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
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nilfs_ioctl_do_get_suinfo);
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nilfs_transaction_end(inode->i_sb, 0);
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up_read(&nilfs->ns_segctor_sem);
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if (ret < 0)
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return ret;
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if (copy_to_user(argp, &argv, sizeof(argv)))
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ret = -EFAULT;
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@ -208,14 +217,13 @@ static int nilfs_ioctl_get_suinfo(struct inode *inode, struct file *filp,
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static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
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unsigned int cmd, void __user *argp)
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{
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struct inode *sufile = NILFS_SB(inode->i_sb)->s_nilfs->ns_sufile;
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struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
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struct nilfs_sustat sustat;
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struct nilfs_transaction_info ti;
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int ret;
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nilfs_transaction_begin(inode->i_sb, &ti, 0);
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ret = nilfs_sufile_get_stat(sufile, &sustat);
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nilfs_transaction_end(inode->i_sb, 0);
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down_read(&nilfs->ns_segctor_sem);
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ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
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up_read(&nilfs->ns_segctor_sem);
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if (ret < 0)
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return ret;
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@ -236,16 +244,17 @@ static int nilfs_ioctl_get_vinfo(struct inode *inode, struct file *filp,
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{
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struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
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struct nilfs_argv argv;
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struct nilfs_transaction_info ti;
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int ret;
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if (copy_from_user(&argv, argp, sizeof(argv)))
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return -EFAULT;
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nilfs_transaction_begin(inode->i_sb, &ti, 0);
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down_read(&nilfs->ns_segctor_sem);
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ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
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nilfs_ioctl_do_get_vinfo);
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nilfs_transaction_end(inode->i_sb, 0);
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up_read(&nilfs->ns_segctor_sem);
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if (ret < 0)
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return ret;
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if (copy_to_user(argp, &argv, sizeof(argv)))
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ret = -EFAULT;
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@ -280,16 +289,17 @@ static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
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{
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struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
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struct nilfs_argv argv;
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struct nilfs_transaction_info ti;
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int ret;
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if (copy_from_user(&argv, argp, sizeof(argv)))
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return -EFAULT;
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nilfs_transaction_begin(inode->i_sb, &ti, 0);
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down_read(&nilfs->ns_segctor_sem);
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ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
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nilfs_ioctl_do_get_bdescs);
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nilfs_transaction_end(inode->i_sb, 0);
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up_read(&nilfs->ns_segctor_sem);
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if (ret < 0)
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return ret;
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if (copy_to_user(argp, &argv, sizeof(argv)))
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ret = -EFAULT;
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@ -123,7 +123,10 @@ static int nilfs_mdt_create_block(struct inode *inode, unsigned long block,
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brelse(bh);
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failed_unlock:
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nilfs_transaction_end(sb, !err);
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if (likely(!err))
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err = nilfs_transaction_commit(sb);
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else
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nilfs_transaction_abort(sb);
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if (writer)
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nilfs_put_writer(nilfs);
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out:
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@ -109,7 +109,7 @@ static int nilfs_create(struct inode *dir, struct dentry *dentry, int mode,
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{
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struct inode *inode;
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struct nilfs_transaction_info ti;
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int err, err2;
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int err;
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err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
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if (err)
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@ -123,8 +123,12 @@ static int nilfs_create(struct inode *dir, struct dentry *dentry, int mode,
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mark_inode_dirty(inode);
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err = nilfs_add_nondir(dentry, inode);
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}
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err2 = nilfs_transaction_end(dir->i_sb, !err);
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return err ? : err2;
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if (!err)
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err = nilfs_transaction_commit(dir->i_sb);
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else
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nilfs_transaction_abort(dir->i_sb);
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return err;
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}
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static int
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@ -132,7 +136,7 @@ nilfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
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{
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struct inode *inode;
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struct nilfs_transaction_info ti;
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int err, err2;
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int err;
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if (!new_valid_dev(rdev))
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return -EINVAL;
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@ -147,8 +151,12 @@ nilfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
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mark_inode_dirty(inode);
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err = nilfs_add_nondir(dentry, inode);
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}
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err2 = nilfs_transaction_end(dir->i_sb, !err);
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return err ? : err2;
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if (!err)
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err = nilfs_transaction_commit(dir->i_sb);
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else
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nilfs_transaction_abort(dir->i_sb);
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return err;
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}
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static int nilfs_symlink(struct inode *dir, struct dentry *dentry,
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@ -158,7 +166,7 @@ static int nilfs_symlink(struct inode *dir, struct dentry *dentry,
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struct super_block *sb = dir->i_sb;
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unsigned l = strlen(symname)+1;
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struct inode *inode;
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int err, err2;
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int err;
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if (l > sb->s_blocksize)
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return -ENAMETOOLONG;
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@ -184,8 +192,12 @@ static int nilfs_symlink(struct inode *dir, struct dentry *dentry,
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err = nilfs_add_nondir(dentry, inode);
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out:
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err2 = nilfs_transaction_end(dir->i_sb, !err);
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return err ? : err2;
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if (!err)
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err = nilfs_transaction_commit(dir->i_sb);
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else
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nilfs_transaction_abort(dir->i_sb);
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return err;
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out_fail:
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inode_dec_link_count(inode);
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@ -198,7 +210,7 @@ static int nilfs_link(struct dentry *old_dentry, struct inode *dir,
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{
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struct inode *inode = old_dentry->d_inode;
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struct nilfs_transaction_info ti;
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int err, err2;
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int err;
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if (inode->i_nlink >= NILFS_LINK_MAX)
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return -EMLINK;
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@ -212,15 +224,19 @@ static int nilfs_link(struct dentry *old_dentry, struct inode *dir,
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atomic_inc(&inode->i_count);
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err = nilfs_add_nondir(dentry, inode);
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err2 = nilfs_transaction_end(dir->i_sb, !err);
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return err ? : err2;
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if (!err)
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err = nilfs_transaction_commit(dir->i_sb);
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else
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nilfs_transaction_abort(dir->i_sb);
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return err;
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}
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static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
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{
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struct inode *inode;
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struct nilfs_transaction_info ti;
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int err, err2;
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int err;
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if (dir->i_nlink >= NILFS_LINK_MAX)
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return -EMLINK;
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@ -252,8 +268,12 @@ static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
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d_instantiate(dentry, inode);
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out:
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err2 = nilfs_transaction_end(dir->i_sb, !err);
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return err ? : err2;
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if (!err)
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err = nilfs_transaction_commit(dir->i_sb);
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else
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nilfs_transaction_abort(dir->i_sb);
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return err;
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out_fail:
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inode_dec_link_count(inode);
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@ -270,7 +290,7 @@ static int nilfs_unlink(struct inode *dir, struct dentry *dentry)
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struct nilfs_dir_entry *de;
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struct page *page;
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struct nilfs_transaction_info ti;
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int err, err2;
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int err;
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err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
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if (err)
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@ -300,15 +320,19 @@ static int nilfs_unlink(struct inode *dir, struct dentry *dentry)
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inode_dec_link_count(inode);
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err = 0;
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out:
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err2 = nilfs_transaction_end(dir->i_sb, !err);
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return err ? : err2;
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if (!err)
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err = nilfs_transaction_commit(dir->i_sb);
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else
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nilfs_transaction_abort(dir->i_sb);
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return err;
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}
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static int nilfs_rmdir(struct inode *dir, struct dentry *dentry)
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{
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struct inode *inode = dentry->d_inode;
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struct nilfs_transaction_info ti;
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int err, err2;
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int err;
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err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
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if (err)
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@ -323,8 +347,12 @@ static int nilfs_rmdir(struct inode *dir, struct dentry *dentry)
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inode_dec_link_count(dir);
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}
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}
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err2 = nilfs_transaction_end(dir->i_sb, !err);
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return err ? : err2;
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if (!err)
|
||||
err = nilfs_transaction_commit(dir->i_sb);
|
||||
else
|
||||
nilfs_transaction_abort(dir->i_sb);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry,
|
||||
@ -404,7 +432,7 @@ static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry,
|
||||
inode_dec_link_count(old_dir);
|
||||
}
|
||||
|
||||
err = nilfs_transaction_end(old_dir->i_sb, 1);
|
||||
err = nilfs_transaction_commit(old_dir->i_sb);
|
||||
return err;
|
||||
|
||||
out_dir:
|
||||
@ -416,7 +444,7 @@ out_old:
|
||||
kunmap(old_page);
|
||||
page_cache_release(old_page);
|
||||
out:
|
||||
nilfs_transaction_end(old_dir->i_sb, 0);
|
||||
nilfs_transaction_abort(old_dir->i_sb);
|
||||
return err;
|
||||
}
|
||||
|
||||
|
||||
@ -166,7 +166,8 @@ struct nilfs_transaction_info {
|
||||
|
||||
int nilfs_transaction_begin(struct super_block *,
|
||||
struct nilfs_transaction_info *, int);
|
||||
int nilfs_transaction_end(struct super_block *, int);
|
||||
int nilfs_transaction_commit(struct super_block *);
|
||||
void nilfs_transaction_abort(struct super_block *);
|
||||
|
||||
static inline void nilfs_set_transaction_flag(unsigned int flag)
|
||||
{
|
||||
|
||||
@ -163,8 +163,8 @@ static int nilfs_prepare_segment_lock(struct nilfs_transaction_info *ti)
|
||||
else {
|
||||
/*
|
||||
* If journal_info field is occupied by other FS,
|
||||
* we save it and restore on nilfs_transaction_end().
|
||||
* But this should never happen.
|
||||
* it is saved and will be restored on
|
||||
* nilfs_transaction_commit().
|
||||
*/
|
||||
printk(KERN_WARNING
|
||||
"NILFS warning: journal info from a different "
|
||||
@ -195,7 +195,7 @@ static int nilfs_prepare_segment_lock(struct nilfs_transaction_info *ti)
|
||||
*
|
||||
* nilfs_transaction_begin() acquires a reader/writer semaphore, called
|
||||
* the segment semaphore, to make a segment construction and write tasks
|
||||
* exclusive. The function is used with nilfs_transaction_end() in pairs.
|
||||
* exclusive. The function is used with nilfs_transaction_commit() in pairs.
|
||||
* The region enclosed by these two functions can be nested. To avoid a
|
||||
* deadlock, the semaphore is only acquired or released in the outermost call.
|
||||
*
|
||||
@ -212,8 +212,6 @@ static int nilfs_prepare_segment_lock(struct nilfs_transaction_info *ti)
|
||||
*
|
||||
* %-ENOMEM - Insufficient memory available.
|
||||
*
|
||||
* %-ERESTARTSYS - Interrupted
|
||||
*
|
||||
* %-ENOSPC - No space left on device
|
||||
*/
|
||||
int nilfs_transaction_begin(struct super_block *sb,
|
||||
@ -248,16 +246,17 @@ int nilfs_transaction_begin(struct super_block *sb,
|
||||
}
|
||||
|
||||
/**
|
||||
* nilfs_transaction_end - end indivisible file operations.
|
||||
* nilfs_transaction_commit - commit indivisible file operations.
|
||||
* @sb: super block
|
||||
* @commit: commit flag (0 for no change)
|
||||
*
|
||||
* nilfs_transaction_end() releases the read semaphore which is
|
||||
* acquired by nilfs_transaction_begin(). Its releasing is only done
|
||||
* in outermost call of this function. If the nilfs_transaction_info
|
||||
* was allocated dynamically, it is given back to a slab cache.
|
||||
* nilfs_transaction_commit() releases the read semaphore which is
|
||||
* acquired by nilfs_transaction_begin(). This is only performed
|
||||
* in outermost call of this function. If a commit flag is set,
|
||||
* nilfs_transaction_commit() sets a timer to start the segment
|
||||
* constructor. If a sync flag is set, it starts construction
|
||||
* directly.
|
||||
*/
|
||||
int nilfs_transaction_end(struct super_block *sb, int commit)
|
||||
int nilfs_transaction_commit(struct super_block *sb)
|
||||
{
|
||||
struct nilfs_transaction_info *ti = current->journal_info;
|
||||
struct nilfs_sb_info *sbi;
|
||||
@ -265,9 +264,7 @@ int nilfs_transaction_end(struct super_block *sb, int commit)
|
||||
int err = 0;
|
||||
|
||||
BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
|
||||
|
||||
if (commit)
|
||||
ti->ti_flags |= NILFS_TI_COMMIT;
|
||||
ti->ti_flags |= NILFS_TI_COMMIT;
|
||||
if (ti->ti_count > 0) {
|
||||
ti->ti_count--;
|
||||
return 0;
|
||||
@ -291,6 +288,22 @@ int nilfs_transaction_end(struct super_block *sb, int commit)
|
||||
return err;
|
||||
}
|
||||
|
||||
void nilfs_transaction_abort(struct super_block *sb)
|
||||
{
|
||||
struct nilfs_transaction_info *ti = current->journal_info;
|
||||
|
||||
BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
|
||||
if (ti->ti_count > 0) {
|
||||
ti->ti_count--;
|
||||
return;
|
||||
}
|
||||
up_read(&NILFS_SB(sb)->s_nilfs->ns_segctor_sem);
|
||||
|
||||
current->journal_info = ti->ti_save;
|
||||
if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
|
||||
kmem_cache_free(nilfs_transaction_cachep, ti);
|
||||
}
|
||||
|
||||
void nilfs_relax_pressure_in_lock(struct super_block *sb)
|
||||
{
|
||||
struct nilfs_sb_info *sbi = NILFS_SB(sb);
|
||||
|
||||
@ -112,8 +112,8 @@ struct the_nilfs {
|
||||
/*
|
||||
* Following fields are dedicated to a writable FS-instance.
|
||||
* Except for the period seeking checkpoint, code outside the segment
|
||||
* constructor must lock a segment semaphore with transaction_begin()
|
||||
* and transaction_end(), when accessing these fields.
|
||||
* constructor must lock a segment semaphore while accessing these
|
||||
* fields.
|
||||
* The writable FS-instance is sole during a lifetime of the_nilfs.
|
||||
*/
|
||||
u64 ns_seg_seq;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user