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author | Chao Yu <chao2.yu@samsung.com> | 2016-02-15 17:54:26 +0800 |
---|---|---|
committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2016-02-22 16:07:23 -0800 |
commit | 922ec355f86365388203672119b5bca346a45085 (patch) | |
tree | 5f8f45642a18e05c51da9053fe1f8da2c9d197c0 /fs/f2fs/namei.c | |
parent | ae1086686487f13130937918ca91d920c1daafcb (diff) | |
download | linux-stable-922ec355f86365388203672119b5bca346a45085.tar.gz linux-stable-922ec355f86365388203672119b5bca346a45085.tar.bz2 linux-stable-922ec355f86365388203672119b5bca346a45085.zip |
f2fs crypto: avoid unneeded memory allocation when {en/de}crypting symlink
This patch adopts f2fs with codes of ext4, it removes unneeded memory
allocation in creating/accessing path of symlink.
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/namei.c')
-rw-r--r-- | fs/f2fs/namei.c | 72 |
1 files changed, 34 insertions, 38 deletions
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c index 6f944e5eb76e..fcc8c26c0fe8 100644 --- a/fs/f2fs/namei.c +++ b/fs/f2fs/namei.c @@ -345,13 +345,23 @@ static int f2fs_symlink(struct inode *dir, struct dentry *dentry, struct f2fs_sb_info *sbi = F2FS_I_SB(dir); struct inode *inode; size_t len = strlen(symname); - size_t p_len; - char *p_str; - struct f2fs_str disk_link = FSTR_INIT(NULL, 0); + struct f2fs_str disk_link = FSTR_INIT((char *)symname, len + 1); struct f2fs_encrypted_symlink_data *sd = NULL; int err; - if (len > dir->i_sb->s_blocksize) + if (f2fs_encrypted_inode(dir)) { + err = f2fs_get_encryption_info(dir); + if (err) + return err; + + if (!f2fs_encrypted_inode(dir)) + return -EPERM; + + disk_link.len = (f2fs_fname_encrypted_size(dir, len) + + sizeof(struct f2fs_encrypted_symlink_data)); + } + + if (disk_link.len > dir->i_sb->s_blocksize) return -ENAMETOOLONG; inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO); @@ -374,42 +384,36 @@ static int f2fs_symlink(struct inode *dir, struct dentry *dentry, f2fs_unlock_op(sbi); alloc_nid_done(sbi, inode->i_ino); - if (f2fs_encrypted_inode(dir)) { + if (f2fs_encrypted_inode(inode)) { struct qstr istr = QSTR_INIT(symname, len); + struct f2fs_str ostr; - err = f2fs_get_encryption_info(inode); - if (err) + sd = kzalloc(disk_link.len, GFP_NOFS); + if (!sd) { + err = -ENOMEM; goto err_out; + } - err = f2fs_fname_crypto_alloc_buffer(inode, len, &disk_link); + err = f2fs_get_encryption_info(inode); if (err) goto err_out; - err = f2fs_fname_usr_to_disk(inode, &istr, &disk_link); - if (err < 0) - goto err_out; - - p_len = encrypted_symlink_data_len(disk_link.len) + 1; - - if (p_len > dir->i_sb->s_blocksize) { - err = -ENAMETOOLONG; + if (!f2fs_encrypted_inode(inode)) { + err = -EPERM; goto err_out; } - sd = kzalloc(p_len, GFP_NOFS); - if (!sd) { - err = -ENOMEM; + ostr.name = sd->encrypted_path; + ostr.len = disk_link.len; + err = f2fs_fname_usr_to_disk(inode, &istr, &ostr); + if (err < 0) goto err_out; - } - memcpy(sd->encrypted_path, disk_link.name, disk_link.len); - sd->len = cpu_to_le16(disk_link.len); - p_str = (char *)sd; - } else { - p_len = len + 1; - p_str = (char *)symname; + + sd->len = cpu_to_le16(ostr.len); + disk_link.name = (char *)sd; } - err = page_symlink(inode, p_str, p_len); + err = page_symlink(inode, disk_link.name, disk_link.len); err_out: d_instantiate(dentry, inode); @@ -425,7 +429,8 @@ err_out: * performance regression. */ if (!err) { - filemap_write_and_wait_range(inode->i_mapping, 0, p_len - 1); + filemap_write_and_wait_range(inode->i_mapping, 0, + disk_link.len - 1); if (IS_DIRSYNC(dir)) f2fs_sync_fs(sbi->sb, 1); @@ -434,7 +439,6 @@ err_out: } kfree(sd); - f2fs_fname_crypto_free_buffer(&disk_link); return err; out: handle_failed_inode(inode); @@ -966,6 +970,7 @@ static const char *f2fs_encrypted_get_link(struct dentry *dentry, /* Symlink is encrypted */ sd = (struct f2fs_encrypted_symlink_data *)caddr; + cstr.name = sd->encrypted_path; cstr.len = le16_to_cpu(sd->len); /* this is broken symlink case */ @@ -973,12 +978,6 @@ static const char *f2fs_encrypted_get_link(struct dentry *dentry, res = -ENOENT; goto errout; } - cstr.name = kmalloc(cstr.len, GFP_NOFS); - if (!cstr.name) { - res = -ENOMEM; - goto errout; - } - memcpy(cstr.name, sd->encrypted_path, cstr.len); /* this is broken symlink case */ if (unlikely(cstr.name[0] == 0)) { @@ -1000,8 +999,6 @@ static const char *f2fs_encrypted_get_link(struct dentry *dentry, if (res < 0) goto errout; - kfree(cstr.name); - paddr = pstr.name; /* Null-terminate the name */ @@ -1011,7 +1008,6 @@ static const char *f2fs_encrypted_get_link(struct dentry *dentry, set_delayed_call(done, kfree_link, paddr); return paddr; errout: - kfree(cstr.name); f2fs_fname_crypto_free_buffer(&pstr); page_cache_release(cpage); return ERR_PTR(res); |