diff options
| author | Chao Yu <yuchao0@huawei.com> | 2018-07-19 23:57:54 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2018-08-01 11:52:36 -0700 |
| commit | 797c1cb56ba58bf42742e9446226345a6216d832 (patch) | |
| tree | df0c8215c666c02446cb6bffab81df1e031d436d /fs/f2fs/xattr.c | |
| parent | e6b0b159cf2f62de69561f585fe8515d3d9189d4 (diff) | |
| download | linux-797c1cb56ba58bf42742e9446226345a6216d832.tar.bz2 | |
f2fs: restrict setting up inode.i_advise
In order to give advise to f2fs to recognize hot/cold file, it is possible
that we can set specific bit in inode.i_advise through setxattr(), but
there are several bits which are used internally, such as encrypt_bit,
keep_size_bit, they should never be changed through setxattr().
So that this patch 1) adds FADVISE_MODIFIABLE_BITS to filter modifiable
bits user given, 2) supports to clear {hot,cold}_file bits.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/xattr.c')
| -rw-r--r-- | fs/f2fs/xattr.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c index 4b34244dcc69..77a010e625f5 100644 --- a/fs/f2fs/xattr.c +++ b/fs/f2fs/xattr.c @@ -94,12 +94,22 @@ static int f2fs_xattr_advise_set(const struct xattr_handler *handler, const char *name, const void *value, size_t size, int flags) { + unsigned char old_advise = F2FS_I(inode)->i_advise; + unsigned char new_advise; + if (!inode_owner_or_capable(inode)) return -EPERM; if (value == NULL) return -EINVAL; - F2FS_I(inode)->i_advise |= *(char *)value; + new_advise = *(char *)value; + if (new_advise & ~FADVISE_MODIFIABLE_BITS) + return -EINVAL; + + new_advise = new_advise & FADVISE_MODIFIABLE_BITS; + new_advise |= old_advise & ~FADVISE_MODIFIABLE_BITS; + + F2FS_I(inode)->i_advise = new_advise; f2fs_mark_inode_dirty_sync(inode, true); return 0; } |