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f2fs: trace f2fs_lookup

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This patch adds trace for f2fs_lookup.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu
2017-10-17 17:33:41 +08:00
committed by Jaegeuk Kim
parent 48ab25f486
commit 0c5e36db17
2 changed files with 88 additions and 17 deletions
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49
fs/f2fs/namei.c
View File

@@ -331,12 +331,15 @@ static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
struct inode *inode = NULL;
struct f2fs_dir_entry *de;
struct page *page;
nid_t ino;
struct dentry *new;
nid_t ino = -1;
int err = 0;
unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
trace_f2fs_lookup_start(dir, dentry, flags);
if (f2fs_encrypted_inode(dir)) {
int res = fscrypt_get_encryption_info(dir);
err = fscrypt_get_encryption_info(dir);
/*
* DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
@@ -346,18 +349,22 @@ static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
if (fscrypt_has_encryption_key(dir))
fscrypt_set_encrypted_dentry(dentry);
fscrypt_set_d_op(dentry);
if (res && res != -ENOKEY)
return ERR_PTR(res);
if (err && err != -ENOKEY)
goto out;
}
if (dentry->d_name.len > F2FS_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
if (dentry->d_name.len > F2FS_NAME_LEN) {
err = -ENAMETOOLONG;
goto out;
}
de = f2fs_find_entry(dir, &dentry->d_name, &page);
if (!de) {
if (IS_ERR(page))
return (struct dentry *)page;
return d_splice_alias(inode, dentry);
if (IS_ERR(page)) {
err = PTR_ERR(page);
goto out;
}
goto out_splice;
}
ino = le32_to_cpu(de->ino);
@@ -365,19 +372,21 @@ static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
f2fs_put_page(page, 0);
inode = f2fs_iget(dir->i_sb, ino);
if (IS_ERR(inode))
return ERR_CAST(inode);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
goto out;
}
if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
err = __recover_dot_dentries(dir, root_ino);
if (err)
goto err_out;
goto out_iput;
}
if (f2fs_has_inline_dots(inode)) {
err = __recover_dot_dentries(inode, dir->i_ino);
if (err)
goto err_out;
goto out_iput;
}
if (f2fs_encrypted_inode(dir) &&
(S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
@@ -386,12 +395,18 @@ static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
"Inconsistent encryption contexts: %lu/%lu",
dir->i_ino, inode->i_ino);
err = -EPERM;
goto err_out;
goto out_iput;
}
return d_splice_alias(inode, dentry);
err_out:
out_splice:
new = d_splice_alias(inode, dentry);
if (IS_ERR(new))
err = PTR_ERR(new);
trace_f2fs_lookup_end(dir, dentry, ino, err);
return new;
out_iput:
iput(inode);
out:
trace_f2fs_lookup_end(dir, dentry, ino, err);
return ERR_PTR(err);
}