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ext4: split inode_operations for encrypted symlinks off the rest

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-04-27 17:51:30 -04:00
parent 3188b2955d
commit a7a67e8a08
4 changed files with 20 additions and 26 deletions
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1
fs/ext4/ext4.h
View File

@ -2847,6 +2847,7 @@ extern int ext4_mpage_readpages(struct address_space *mapping,
unsigned nr_pages);
/* symlink.c */
extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
extern const struct inode_operations ext4_symlink_inode_operations;
extern const struct inode_operations ext4_fast_symlink_inode_operations;

6
fs/ext4/inode.c
View File

@ -4213,8 +4213,10 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
inode->i_op = &ext4_dir_inode_operations;
inode->i_fop = &ext4_dir_operations;
} else if (S_ISLNK(inode->i_mode)) {
if (ext4_inode_is_fast_symlink(inode) &&
!ext4_encrypted_inode(inode)) {
if (ext4_encrypted_inode(inode)) {
inode->i_op = &ext4_encrypted_symlink_inode_operations;
ext4_set_aops(inode);
} else if (ext4_inode_is_fast_symlink(inode)) {
inode->i_op = &ext4_fast_symlink_inode_operations;
nd_terminate_link(ei->i_data, inode->i_size,
sizeof(ei->i_data) - 1);

9
fs/ext4/namei.c
View File

@ -3206,10 +3206,12 @@ static int ext4_symlink(struct inode *dir,
goto err_drop_inode;
sd->len = cpu_to_le16(ostr.len);
disk_link.name = (char *) sd;
inode->i_op = &ext4_encrypted_symlink_inode_operations;
}
if ((disk_link.len > EXT4_N_BLOCKS * 4)) {
inode->i_op = &ext4_symlink_inode_operations;
if (!encryption_required)
inode->i_op = &ext4_symlink_inode_operations;
ext4_set_aops(inode);
/*
* We cannot call page_symlink() with transaction started
@ -3249,9 +3251,8 @@ static int ext4_symlink(struct inode *dir,
} else {
/* clear the extent format for fast symlink */
ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
inode->i_op = encryption_required ?
&ext4_symlink_inode_operations :
&ext4_fast_symlink_inode_operations;
if (!encryption_required)
inode->i_op = &ext4_fast_symlink_inode_operations;
memcpy((char *)&EXT4_I(inode)->i_data, disk_link.name,
disk_link.len);
inode->i_size = disk_link.len - 1;

30
fs/ext4/symlink.c
View File

@ -35,9 +35,6 @@ static void *ext4_follow_link(struct dentry *dentry, struct nameidata *nd)
int res;
u32 plen, max_size = inode->i_sb->s_blocksize;
if (!ext4_encrypted_inode(inode))
return page_follow_link_light(dentry, nd);
ctx = ext4_get_fname_crypto_ctx(inode, inode->i_sb->s_blocksize);
if (IS_ERR(ctx))
return ctx;
@ -97,18 +94,16 @@ errout:
return ERR_PTR(res);
}
static void ext4_put_link(struct dentry *dentry, struct nameidata *nd,
void *cookie)
{
struct page *page = cookie;
if (!page) {
kfree(nd_get_link(nd));
} else {
kunmap(page);
page_cache_release(page);
}
}
const struct inode_operations ext4_encrypted_symlink_inode_operations = {
.readlink = generic_readlink,
.follow_link = ext4_follow_link,
.put_link = kfree_put_link,
.setattr = ext4_setattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = ext4_listxattr,
.removexattr = generic_removexattr,
};
#endif
static void *ext4_follow_fast_link(struct dentry *dentry, struct nameidata *nd)
@ -120,13 +115,8 @@ static void *ext4_follow_fast_link(struct dentry *dentry, struct nameidata *nd)
const struct inode_operations ext4_symlink_inode_operations = {
.readlink = generic_readlink,
#ifdef CONFIG_EXT4_FS_ENCRYPTION
.follow_link = ext4_follow_link,
.put_link = ext4_put_link,
#else
.follow_link = page_follow_link_light,
.put_link = page_put_link,
#endif
.setattr = ext4_setattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,