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| author | Yan, Zheng <zyan@redhat.com> | 2016-05-05 10:40:17 +0200 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2016-05-26 01:15:38 +0200 |
| commit | 224a7542b8fdde3cc7c600f8b0870c5541a9f678 (patch) | |
| tree | 71875474331a7743a051bfb273d419982d0b3741 /fs/ceph | |
| parent | ceph: improve fragtree change detection (diff) | |
| download | linux-224a7542b8fdde3cc7c600f8b0870c5541a9f678.tar.xz linux-224a7542b8fdde3cc7c600f8b0870c5541a9f678.zip | |
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>
Diffstat (limited to 'fs/ceph')
| -rw-r--r-- | fs/ceph/inode.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c index 7ba8e1c2557b..89d08155986d 100644 --- a/fs/ceph/inode.c +++ b/fs/ceph/inode.c @@ -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; |