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f2fs crypto: add filename encryption for f2fs_add_link 

This patch adds filename encryption support for f2fs_add_link.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2015-04-27 14:51:02 -07:00
parent 4375a33664
commit 9ea97163c6
1 changed files with 27 additions and 12 deletions
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39
fs/f2fs/dir.c
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@ -507,24 +507,33 @@ int __f2fs_add_link(struct inode *dir, const struct qstr *name,
unsigned long bidx, block; unsigned long bidx, block;
f2fs_hash_t dentry_hash; f2fs_hash_t dentry_hash;
unsigned int nbucket, nblock; unsigned int nbucket, nblock;
size_t namelen = name->len;
struct page *dentry_page = NULL; struct page *dentry_page = NULL;
struct f2fs_dentry_block *dentry_blk = NULL; struct f2fs_dentry_block *dentry_blk = NULL;
struct f2fs_dentry_ptr d; struct f2fs_dentry_ptr d;
int slots = GET_DENTRY_SLOTS(namelen);
struct page *page = NULL; struct page *page = NULL;
int err = 0; struct f2fs_filename fname;
struct qstr new_name;
int slots, err;
err = f2fs_fname_setup_filename(dir, name, 0, &fname);
if (err)
return err;
new_name.name = fname_name(&fname);
new_name.len = fname_len(&fname);
if (f2fs_has_inline_dentry(dir)) { if (f2fs_has_inline_dentry(dir)) {
err = f2fs_add_inline_entry(dir, name, inode, ino, mode); err = f2fs_add_inline_entry(dir, &new_name, inode, ino, mode);
if (!err || err != -EAGAIN) if (!err || err != -EAGAIN)
return err; goto out;
else else
err = 0; err = 0;
} }
dentry_hash = f2fs_dentry_hash(name);
level = 0; level = 0;
slots = GET_DENTRY_SLOTS(new_name.len);
dentry_hash = f2fs_dentry_hash(&new_name);
current_depth = F2FS_I(dir)->i_current_depth; current_depth = F2FS_I(dir)->i_current_depth;
if (F2FS_I(dir)->chash == dentry_hash) { if (F2FS_I(dir)->chash == dentry_hash) {
level = F2FS_I(dir)->clevel; level = F2FS_I(dir)->clevel;
@ -532,8 +541,10 @@ int __f2fs_add_link(struct inode *dir, const struct qstr *name,
} }
start: start:
if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) {
return -ENOSPC; err = -ENOSPC;
goto out;
}
/* Increase the depth, if required */ /* Increase the depth, if required */
if (level == current_depth) if (level == current_depth)
@ -547,8 +558,10 @@ int __f2fs_add_link(struct inode *dir, const struct qstr *name,
for (block = bidx; block <= (bidx + nblock - 1); block++) { for (block = bidx; block <= (bidx + nblock - 1); block++) {
dentry_page = get_new_data_page(dir, NULL, block, true); dentry_page = get_new_data_page(dir, NULL, block, true);
if (IS_ERR(dentry_page)) if (IS_ERR(dentry_page)) {
return PTR_ERR(dentry_page); err = PTR_ERR(dentry_page);
goto out;
}
dentry_blk = kmap(dentry_page); dentry_blk = kmap(dentry_page);
bit_pos = room_for_filename(&dentry_blk->dentry_bitmap, bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
@ -568,7 +581,7 @@ int __f2fs_add_link(struct inode *dir, const struct qstr *name,
if (inode) { if (inode) {
down_write(&F2FS_I(inode)->i_sem); down_write(&F2FS_I(inode)->i_sem);
page = init_inode_metadata(inode, dir, name, NULL); page = init_inode_metadata(inode, dir, &new_name, NULL);
if (IS_ERR(page)) { if (IS_ERR(page)) {
err = PTR_ERR(page); err = PTR_ERR(page);
goto fail; goto fail;
@ -576,7 +589,7 @@ int __f2fs_add_link(struct inode *dir, const struct qstr *name,
} }
make_dentry_ptr(&d, (void *)dentry_blk, 1); make_dentry_ptr(&d, (void *)dentry_blk, 1);
f2fs_update_dentry(ino, mode, &d, name, dentry_hash, bit_pos); f2fs_update_dentry(ino, mode, &d, &new_name, dentry_hash, bit_pos);
set_page_dirty(dentry_page); set_page_dirty(dentry_page);
@ -598,6 +611,8 @@ int __f2fs_add_link(struct inode *dir, const struct qstr *name,
} }
kunmap(dentry_page); kunmap(dentry_page);
f2fs_put_page(dentry_page, 1); f2fs_put_page(dentry_page, 1);
out:
f2fs_fname_free_filename(&fname);
return err; return err;
} }