diff options
Diffstat (limited to 'fs/erofs/namei.c')
-rw-r--r-- | fs/erofs/namei.c | 72 |
1 files changed, 28 insertions, 44 deletions
diff --git a/fs/erofs/namei.c b/fs/erofs/namei.c index 8629e616028c..0dc34721080c 100644 --- a/fs/erofs/namei.c +++ b/fs/erofs/namei.c @@ -2,6 +2,7 @@ /* * Copyright (C) 2017-2018 HUAWEI, Inc. * https://www.huawei.com/ + * Copyright (C) 2022, Alibaba Cloud */ #include "xattr.h" @@ -86,14 +87,14 @@ static struct erofs_dirent *find_target_dirent(struct erofs_qstr *name, return ERR_PTR(-ENOENT); } -static struct page *find_target_block_classic(struct inode *dir, - struct erofs_qstr *name, - int *_ndirents) +static void *find_target_block_classic(struct erofs_buf *target, + struct inode *dir, + struct erofs_qstr *name, + int *_ndirents) { unsigned int startprfx, endprfx; int head, back; - struct address_space *const mapping = dir->i_mapping; - struct page *candidate = ERR_PTR(-ENOENT); + void *candidate = ERR_PTR(-ENOENT); startprfx = endprfx = 0; head = 0; @@ -101,10 +102,11 @@ static struct page *find_target_block_classic(struct inode *dir, while (head <= back) { const int mid = head + (back - head) / 2; - struct page *page = read_mapping_page(mapping, mid, NULL); + struct erofs_buf buf = __EROFS_BUF_INITIALIZER; + struct erofs_dirent *de; - if (!IS_ERR(page)) { - struct erofs_dirent *de = kmap_atomic(page); + de = erofs_bread(&buf, dir, mid, EROFS_KMAP); + if (!IS_ERR(de)) { const int nameoff = nameoff_from_disk(de->nameoff, EROFS_BLKSIZ); const int ndirents = nameoff / sizeof(*de); @@ -113,13 +115,12 @@ static struct page *find_target_block_classic(struct inode *dir, struct erofs_qstr dname; if (!ndirents) { - kunmap_atomic(de); - put_page(page); + erofs_put_metabuf(&buf); erofs_err(dir->i_sb, "corrupted dir block %d @ nid %llu", mid, EROFS_I(dir)->nid); DBG_BUGON(1); - page = ERR_PTR(-EFSCORRUPTED); + de = ERR_PTR(-EFSCORRUPTED); goto out; } @@ -135,7 +136,6 @@ static struct page *find_target_block_classic(struct inode *dir, /* string comparison without already matched prefix */ diff = erofs_dirnamecmp(name, &dname, &matched); - kunmap_atomic(de); if (!diff) { *_ndirents = 0; @@ -145,11 +145,12 @@ static struct page *find_target_block_classic(struct inode *dir, startprfx = matched; if (!IS_ERR(candidate)) - put_page(candidate); - candidate = page; + erofs_put_metabuf(target); + *target = buf; + candidate = de; *_ndirents = ndirents; } else { - put_page(page); + erofs_put_metabuf(&buf); back = mid - 1; endprfx = matched; @@ -158,19 +159,17 @@ static struct page *find_target_block_classic(struct inode *dir, } out: /* free if the candidate is valid */ if (!IS_ERR(candidate)) - put_page(candidate); - return page; + erofs_put_metabuf(target); + return de; } return candidate; } -int erofs_namei(struct inode *dir, - struct qstr *name, - erofs_nid_t *nid, unsigned int *d_type) +int erofs_namei(struct inode *dir, const struct qstr *name, erofs_nid_t *nid, + unsigned int *d_type) { int ndirents; - struct page *page; - void *data; + struct erofs_buf buf = __EROFS_BUF_INITIALIZER; struct erofs_dirent *de; struct erofs_qstr qn; @@ -181,32 +180,23 @@ int erofs_namei(struct inode *dir, qn.end = name->name + name->len; ndirents = 0; - page = find_target_block_classic(dir, &qn, &ndirents); - if (IS_ERR(page)) - return PTR_ERR(page); + de = find_target_block_classic(&buf, dir, &qn, &ndirents); + if (IS_ERR(de)) + return PTR_ERR(de); - data = kmap_atomic(page); - /* the target page has been mapped */ if (ndirents) - de = find_target_dirent(&qn, data, EROFS_BLKSIZ, ndirents); - else - de = (struct erofs_dirent *)data; + de = find_target_dirent(&qn, (u8 *)de, EROFS_BLKSIZ, ndirents); if (!IS_ERR(de)) { *nid = le64_to_cpu(de->nid); *d_type = de->file_type; } - - kunmap_atomic(data); - put_page(page); - + erofs_put_metabuf(&buf); return PTR_ERR_OR_ZERO(de); } -/* NOTE: i_mutex is already held by vfs */ -static struct dentry *erofs_lookup(struct inode *dir, - struct dentry *dentry, +static struct dentry *erofs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) { int err; @@ -214,17 +204,11 @@ static struct dentry *erofs_lookup(struct inode *dir, unsigned int d_type; struct inode *inode; - DBG_BUGON(!d_really_is_negative(dentry)); - /* dentry must be unhashed in lookup, no need to worry about */ - DBG_BUGON(!d_unhashed(dentry)); - trace_erofs_lookup(dir, dentry, flags); - /* file name exceeds fs limit */ if (dentry->d_name.len > EROFS_NAME_LEN) return ERR_PTR(-ENAMETOOLONG); - /* false uninitialized warnings on gcc 4.8.x */ err = erofs_namei(dir, &dentry->d_name, &nid, &d_type); if (err == -ENOENT) { @@ -235,7 +219,7 @@ static struct dentry *erofs_lookup(struct inode *dir, } else { erofs_dbg("%s, %pd (nid %llu) found, d_type %u", __func__, dentry, nid, d_type); - inode = erofs_iget(dir->i_sb, nid, d_type == FT_DIR); + inode = erofs_iget(dir->i_sb, nid); } return d_splice_alias(inode, dentry); } |