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| author | Michael Halcrow <mhalcrow@google.com> | 2015-04-12 00:55:10 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2015-04-12 00:55:10 -0400 |
| commit | 2058f83a728adffbe00bded4f804b37a5ee58cbe (patch) | |
| tree | e0bc1cf2aa8e3a36e9543567c5c248f785f88e2c /fs/ext4/extents.c | |
| parent | dde680cefc842e58524772099a3b8219e5abf551 (diff) | |
| download | linux-2058f83a728adffbe00bded4f804b37a5ee58cbe.tar.gz | |
ext4 crypto: implement the ext4 encryption write path
Pulls block_write_begin() into fs/ext4/inode.c because it might need
to do a low-level read of the existing data, in which case we need to
decrypt it.
Signed-off-by: Michael Halcrow <mhalcrow@google.com>
Signed-off-by: Ildar Muslukhov <ildarm@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/extents.c')
| -rw-r--r-- | fs/ext4/extents.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 74580ea3ab556..973816bfe4a9d 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -3122,6 +3122,9 @@ static int ext4_ext_zeroout(struct inode *inode, struct ext4_extent *ex) ee_len = ext4_ext_get_actual_len(ex); ee_pblock = ext4_ext_pblock(ex); + if (ext4_encrypted_inode(inode)) + return ext4_encrypted_zeroout(inode, ex); + ret = sb_issue_zeroout(inode->i_sb, ee_pblock, ee_len, GFP_NOFS); if (ret > 0) ret = 0; @@ -4898,6 +4901,20 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len) ext4_lblk_t lblk; unsigned int blkbits = inode->i_blkbits; + /* + * Encrypted inodes can't handle collapse range or insert + * range since we would need to re-encrypt blocks with a + * different IV or XTS tweak (which are based on the logical + * block number). + * + * XXX It's not clear why zero range isn't working, but we'll + * leave it disabled for encrypted inodes for now. This is a + * bug we should fix.... + */ + if (ext4_encrypted_inode(inode) && + (mode & (FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE))) + return -EOPNOTSUPP; + /* Return error if mode is not supported */ if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE)) |