ceph: tolerate bad i_size for symlink inode
A mds bug can cause symlink's size to be truncated to zero. Signed-off-by: Yan, Zheng <zyan@redhat.com>
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1b1bc16d66
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@ -582,6 +582,11 @@ int ceph_drop_inode(struct inode *inode)
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return 1;
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}
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static inline blkcnt_t calc_inode_blocks(u64 size)
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{
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return (size + (1<<9) - 1) >> 9;
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}
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/*
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* Helpers to fill in size, ctime, mtime, and atime. We have to be
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* careful because either the client or MDS may have more up to date
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@ -604,7 +609,7 @@ int ceph_fill_file_size(struct inode *inode, int issued,
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size = 0;
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}
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i_size_write(inode, size);
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inode->i_blocks = (size + (1<<9) - 1) >> 9;
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inode->i_blocks = calc_inode_blocks(size);
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ci->i_reported_size = size;
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if (truncate_seq != ci->i_truncate_seq) {
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dout("truncate_seq %u -> %u\n",
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@ -863,9 +868,13 @@ static int fill_inode(struct inode *inode, struct page *locked_page,
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spin_unlock(&ci->i_ceph_lock);
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err = -EINVAL;
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if (WARN_ON(symlen != i_size_read(inode)))
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goto out;
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if (symlen != i_size_read(inode)) {
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pr_err("fill_inode %llx.%llx BAD symlink "
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"size %lld\n", ceph_vinop(inode),
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i_size_read(inode));
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i_size_write(inode, symlen);
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inode->i_blocks = calc_inode_blocks(symlen);
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}
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err = -ENOMEM;
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sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
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@ -1629,7 +1638,7 @@ int ceph_inode_set_size(struct inode *inode, loff_t size)
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spin_lock(&ci->i_ceph_lock);
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dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
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i_size_write(inode, size);
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inode->i_blocks = (size + (1 << 9) - 1) >> 9;
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inode->i_blocks = calc_inode_blocks(size);
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/* tell the MDS if we are approaching max_size */
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if ((size << 1) >= ci->i_max_size &&
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@ -2002,8 +2011,7 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
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if ((issued & CEPH_CAP_FILE_EXCL) &&
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attr->ia_size > inode->i_size) {
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i_size_write(inode, attr->ia_size);
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inode->i_blocks =
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(attr->ia_size + (1 << 9) - 1) >> 9;
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inode->i_blocks = calc_inode_blocks(attr->ia_size);
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inode->i_ctime = attr->ia_ctime;
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ci->i_reported_size = attr->ia_size;
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dirtied |= CEPH_CAP_FILE_EXCL;
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