There exists many similar and duplicate codes to check "." and "..", so introduce is_dot_dotdot helper to make the code more clean.
Signed-off-by: Tiezhu Yang <[email protected]> --- v2: - use the better performance implementation of is_dot_dotdot - make it static inline and move it to include/linux/fs.h fs/crypto/fname.c | 15 ++------------- fs/ecryptfs/crypto.c | 13 ++----------- fs/f2fs/f2fs.h | 11 ----------- fs/namei.c | 6 ++---- include/linux/fs.h | 10 ++++++++++ 5 files changed, 16 insertions(+), 39 deletions(-) diff --git a/fs/crypto/fname.c b/fs/crypto/fname.c index 3da3707..36be864 100644 --- a/fs/crypto/fname.c +++ b/fs/crypto/fname.c @@ -15,17 +15,6 @@ #include <crypto/skcipher.h> #include "fscrypt_private.h" -static inline bool fscrypt_is_dot_dotdot(const struct qstr *str) -{ - if (str->len == 1 && str->name[0] == '.') - return true; - - if (str->len == 2 && str->name[0] == '.' && str->name[1] == '.') - return true; - - return false; -} - /** * fname_encrypt() - encrypt a filename * @@ -255,7 +244,7 @@ int fscrypt_fname_disk_to_usr(struct inode *inode, const struct qstr qname = FSTR_TO_QSTR(iname); struct fscrypt_digested_name digested_name; - if (fscrypt_is_dot_dotdot(&qname)) { + if (is_dot_dotdot(&qname)) { oname->name[0] = '.'; oname->name[iname->len - 1] = '.'; oname->len = iname->len; @@ -323,7 +312,7 @@ int fscrypt_setup_filename(struct inode *dir, const struct qstr *iname, memset(fname, 0, sizeof(struct fscrypt_name)); fname->usr_fname = iname; - if (!IS_ENCRYPTED(dir) || fscrypt_is_dot_dotdot(iname)) { + if (!IS_ENCRYPTED(dir) || is_dot_dotdot(iname)) { fname->disk_name.name = (unsigned char *)iname->name; fname->disk_name.len = iname->len; return 0; diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c index f91db24..6f4db74 100644 --- a/fs/ecryptfs/crypto.c +++ b/fs/ecryptfs/crypto.c @@ -1991,16 +1991,6 @@ int ecryptfs_encrypt_and_encode_filename( return rc; } -static bool is_dot_dotdot(const char *name, size_t name_size) -{ - if (name_size == 1 && name[0] == '.') - return true; - else if (name_size == 2 && name[0] == '.' && name[1] == '.') - return true; - - return false; -} - /** * ecryptfs_decode_and_decrypt_filename - converts the encoded cipher text name to decoded plaintext * @plaintext_name: The plaintext name @@ -2020,6 +2010,7 @@ int ecryptfs_decode_and_decrypt_filename(char **plaintext_name, { struct ecryptfs_mount_crypt_stat *mount_crypt_stat = &ecryptfs_superblock_to_private(sb)->mount_crypt_stat; + const struct qstr file_name = {.name = name, .len = name_size}; char *decoded_name; size_t decoded_name_size; size_t packet_size; @@ -2027,7 +2018,7 @@ int ecryptfs_decode_and_decrypt_filename(char **plaintext_name, if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) && !(mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)) { - if (is_dot_dotdot(name, name_size)) { + if (is_dot_dotdot(&file_name)) { rc = ecryptfs_copy_filename(plaintext_name, plaintext_name_size, name, name_size); diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 5a888a0..3d5e684 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -2767,17 +2767,6 @@ static inline bool f2fs_cp_error(struct f2fs_sb_info *sbi) return is_set_ckpt_flags(sbi, CP_ERROR_FLAG); } -static inline bool is_dot_dotdot(const struct qstr *str) -{ - if (str->len == 1 && str->name[0] == '.') - return true; - - if (str->len == 2 && str->name[0] == '.' && str->name[1] == '.') - return true; - - return false; -} - static inline bool f2fs_may_extent_tree(struct inode *inode) { struct f2fs_sb_info *sbi = F2FS_I_SB(inode); diff --git a/fs/namei.c b/fs/namei.c index 2dda552..babe7e8 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -2458,10 +2458,8 @@ static int lookup_one_len_common(const char *name, struct dentry *base, if (!len) return -EACCES; - if (unlikely(name[0] == '.')) { - if (len < 2 || (len == 2 && name[1] == '.')) - return -EACCES; - } + if (is_dot_dotdot(this)) + return -EACCES; while (len--) { unsigned int c = *(const unsigned char *)name++; diff --git a/include/linux/fs.h b/include/linux/fs.h index 98e0349..78a2932 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3627,4 +3627,14 @@ static inline int inode_drain_writes(struct inode *inode) return filemap_write_and_wait(inode->i_mapping); } +static inline bool is_dot_dotdot(const struct qstr *str) +{ + if (unlikely(str->name[0] == '.')) { + if (str->len < 2 || (str->len == 2 && str->name[1] == '.')) + return true; + } + + return false; +} + #endif /* _LINUX_FS_H */ -- 2.1.0 _______________________________________________ Linux-f2fs-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
