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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>
This commit is contained in:
Yan, Zheng 2016-05-05 16:40:17 +08:00 committed by Ilya Dryomov
parent 1b1bc16d66
commit 224a7542b8
1 changed files with 15 additions and 7 deletions
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22
fs/ceph/inode.c
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@ -582,6 +582,11 @@ int ceph_drop_inode(struct inode *inode)
return 1;
}
static inline blkcnt_t calc_inode_blocks(u64 size)
{
return (size + (1<<9) - 1) >> 9;
}
/*
* Helpers to fill in size, ctime, mtime, and atime. We have to be
* careful because either the client or MDS may have more up to date
@ -604,7 +609,7 @@ int ceph_fill_file_size(struct inode *inode, int issued,
size = 0;
}
i_size_write(inode, size);
inode->i_blocks = (size + (1<<9) - 1) >> 9;
inode->i_blocks = calc_inode_blocks(size);
ci->i_reported_size = size;
if (truncate_seq != ci->i_truncate_seq) {
dout("truncate_seq %u -> %u\n",
@ -863,9 +868,13 @@ static int fill_inode(struct inode *inode, struct page *locked_page,
spin_unlock(&ci->i_ceph_lock);
err = -EINVAL;
if (WARN_ON(symlen != i_size_read(inode)))
goto out;
if (symlen != i_size_read(inode)) {
pr_err("fill_inode %llx.%llx BAD symlink "
"size %lld\n", ceph_vinop(inode),
i_size_read(inode));
i_size_write(inode, symlen);
inode->i_blocks = calc_inode_blocks(symlen);
}
err = -ENOMEM;
sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
@ -1629,7 +1638,7 @@ int ceph_inode_set_size(struct inode *inode, loff_t size)
spin_lock(&ci->i_ceph_lock);
dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
i_size_write(inode, size);
inode->i_blocks = (size + (1 << 9) - 1) >> 9;
inode->i_blocks = calc_inode_blocks(size);
/* tell the MDS if we are approaching max_size */
if ((size << 1) >= ci->i_max_size &&
@ -2002,8 +2011,7 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
if ((issued & CEPH_CAP_FILE_EXCL) &&
attr->ia_size > inode->i_size) {
i_size_write(inode, attr->ia_size);
inode->i_blocks =
(attr->ia_size + (1 << 9) - 1) >> 9;
inode->i_blocks = calc_inode_blocks(attr->ia_size);
inode->i_ctime = attr->ia_ctime;
ci->i_reported_size = attr->ia_size;
dirtied |= CEPH_CAP_FILE_EXCL;