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authorRichard Weinberger <richard@nod.at>2016-11-11 22:46:06 +0300
committerRichard Weinberger <richard@nod.at>2016-12-13 01:07:38 +0300
commit528e3d178f257e36001345d4d61ae5af35422017 (patch)
tree6ad691850c8ab01965cc3b556b746b1828efb002 /fs/ubifs/ubifs-media.h
parentb91dc9816e5cd684b0d131fe6ec608a99bfbe3ee (diff)
downloadlinux-528e3d178f257e36001345d4d61ae5af35422017.tar.xz
ubifs: Add full hash lookup support
UBIFS stores a 32bit hash of every file, for traditional lookups by name this scheme is fine since UBIFS can first try to find the file by the hash of the filename and upon collisions it can walk through all entries with the same hash and do a string compare. When filesnames are encrypted fscrypto will ask the filesystem for a unique cookie, based on this cookie the filesystem has to be able to locate the target file again. With 32bit hashes this is impossible because the chance for collisions is very high. Do deal with that we store a 32bit cookie directly in the UBIFS directory entry node such that we get a 64bit cookie (32bit from filename hash and the dent cookie). For a lookup by hash UBIFS finds the entry by the first 32bit and then compares the dent cookie. If it does not match, it has to do a linear search of the whole directory and compares all dent cookies until the correct entry is found. Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'fs/ubifs/ubifs-media.h')
-rw-r--r--fs/ubifs/ubifs-media.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/ubifs/ubifs-media.h b/fs/ubifs/ubifs-media.h
index e46331dcca4c..249124d9a801 100644
--- a/fs/ubifs/ubifs-media.h
+++ b/fs/ubifs/ubifs-media.h
@@ -530,7 +530,8 @@ struct ubifs_ino_node {
* @padding1: reserved for future, zeroes
* @type: type of the target inode (%UBIFS_ITYPE_REG, %UBIFS_ITYPE_DIR, etc)
* @nlen: name length
- * @padding2: reserved for future, zeroes
+ * @cookie: A 32bits random number, used to construct a 64bits
+ * identifier.
* @name: zero-terminated name
*
* Note, do not forget to amend 'zero_dent_node_unused()' function when
@@ -543,7 +544,7 @@ struct ubifs_dent_node {
__u8 padding1;
__u8 type;
__le16 nlen;
- __u8 padding2[4]; /* Watch 'zero_dent_node_unused()' if changing! */
+ __le32 cookie;
__u8 name[];
} __packed;