Compress and decompress now have an extra u8 *key field, and NULL is passed wherever it is used. Later this will be used for an encryption key for the data being compressed/decompressed (and NULL if no cryptographic operations should be done.) Signed-off-by: Joel Reardon <reardonj@xxxxxxxxxxx> >From 650a52b5301778cf2f0c17ed993a104a4473a8fb Mon Sep 17 00:00:00 2001 From: Joel Reardon <jreardon@fatbottomsworth.(none)> Date: Sun, 25 Mar 2012 23:06:03 +0200 Subject: [PATCH] Added a key parameter to de/compress. --- fs/ubifs/compress.c | 8 ++++++-- fs/ubifs/file.c | 5 +++-- fs/ubifs/journal.c | 7 ++++--- fs/ubifs/ubifs.h | 4 ++-- 4 files changed, 15 insertions(+), 9 deletions(-) diff --git a/fs/ubifs/compress.c b/fs/ubifs/compress.c index 11e4132..d1812fa 100644 --- a/fs/ubifs/compress.c +++ b/fs/ubifs/compress.c @@ -82,6 +82,8 @@ struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT]; * @out_len: output buffer length is returned here * @compr_type: type of compression to use on enter, actually used compression * type on exit + * @key: a pointer to a key-sized buffer to use as the encryption key. if NULL + * then no encryption is performed. * * This function compresses input buffer @in_buf of length @in_len and stores * the result in the output buffer @out_buf and the resulting length in @@ -93,7 +95,7 @@ struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT]; * buffer and %UBIFS_COMPR_NONE is returned in @compr_type. */ void ubifs_compress(const void *in_buf, int in_len, void *out_buf, int *out_len, - int *compr_type) + int *compr_type, u8 *key) { int err; struct ubifs_compressor *compr = ubifs_compressors[*compr_type]; @@ -140,13 +142,15 @@ no_compr: * @out_buf: output buffer where decompressed data should * @out_len: output length is returned here * @compr_type: type of compression + * @key: a pointer to a key-sized buffer to use as the decryption key. if + * NULL then no decryption is performed. * * This function decompresses data from buffer @in_buf into buffer @out_buf. * The length of the uncompressed data is returned in @out_len. This functions * returns %0 on success or a negative error code on failure. */ int ubifs_decompress(const void *in_buf, int in_len, void *out_buf, - int *out_len, int compr_type) + int *out_len, int compr_type, u8 *key) { int err; struct ubifs_compressor *compr; diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c index f9c234b..2660c9f 100644 --- a/fs/ubifs/file.c +++ b/fs/ubifs/file.c @@ -80,7 +80,7 @@ static int read_block(struct inode *inode, void *addr, unsigned int block, dlen = le32_to_cpu(dn->ch.len) - UBIFS_DATA_NODE_SZ; out_len = UBIFS_BLOCK_SIZE; err = ubifs_decompress(&dn->data, dlen, addr, &out_len, - le16_to_cpu(dn->compr_type)); + le16_to_cpu(dn->compr_type), NULL); if (err || len != out_len) goto dump; @@ -649,7 +649,8 @@ static int populate_page(struct ubifs_info *c, struct page *page, dlen = le32_to_cpu(dn->ch.len) - UBIFS_DATA_NODE_SZ; out_len = UBIFS_BLOCK_SIZE; err = ubifs_decompress(&dn->data, dlen, addr, &out_len, - le16_to_cpu(dn->compr_type)); + le16_to_cpu(dn->compr_type), + NULL); if (err || len != out_len) goto out_err; diff --git a/fs/ubifs/journal.c b/fs/ubifs/journal.c index 2f438ab..9156395 100644 --- a/fs/ubifs/journal.c +++ b/fs/ubifs/journal.c @@ -727,7 +727,7 @@ int ubifs_jnl_write_data(struct ubifs_info *c, const struct inode *inode, compr_type = ui->compr_type; out_len = dlen - UBIFS_DATA_NODE_SZ; - ubifs_compress(buf, len, &data->data, &out_len, &compr_type); + ubifs_compress(buf, len, &data->data, &out_len, &compr_type, NULL); ubifs_assert(out_len <= UBIFS_BLOCK_SIZE); dlen = UBIFS_DATA_NODE_SZ + out_len; @@ -1110,11 +1110,12 @@ static int recomp_data_node(struct ubifs_data_node *dn, int *new_len) len = le32_to_cpu(dn->ch.len) - UBIFS_DATA_NODE_SZ; compr_type = le16_to_cpu(dn->compr_type); - err = ubifs_decompress(&dn->data, len, buf, &out_len, compr_type); + err = ubifs_decompress( + &dn->data, len, buf, &out_len, compr_type, NULL); if (err) goto out; - ubifs_compress(buf, *new_len, &dn->data, &out_len, &compr_type); + ubifs_compress(buf, *new_len, &dn->data, &out_len, &compr_type, NULL); ubifs_assert(out_len <= UBIFS_BLOCK_SIZE); dn->compr_type = cpu_to_le16(compr_type); dn->size = cpu_to_le32(*new_len); diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h index 93d59ac..0cc1180 100644 --- a/fs/ubifs/ubifs.h +++ b/fs/ubifs/ubifs.h @@ -1772,9 +1772,9 @@ long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg); int __init ubifs_compressors_init(void); void ubifs_compressors_exit(void); void ubifs_compress(const void *in_buf, int in_len, void *out_buf, int *out_len, - int *compr_type); + int *compr_type, u8 *key); int ubifs_decompress(const void *buf, int len, void *out, int *out_len, - int compr_type); + int compr_type, u8 *key); #include "debug.h" #include "misc.h" -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html