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author | Miklos Szeredi <mszeredi@redhat.com> | 2018-07-18 15:44:42 +0200 |
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committer | Miklos Szeredi <mszeredi@redhat.com> | 2018-07-18 15:44:42 +0200 |
commit | 9e142c4102db44c3c7a2656de8a1e2ddda2fae71 (patch) | |
tree | 20235bd8d4b69e17b385584056d598dc57ac5dcb /fs/overlayfs | |
parent | dab5ca8fd9ddd3c0768e14bc1524bd3e7b8aa430 (diff) | |
download | linux-stable-9e142c4102db44c3c7a2656de8a1e2ddda2fae71.tar.gz linux-stable-9e142c4102db44c3c7a2656de8a1e2ddda2fae71.tar.bz2 linux-stable-9e142c4102db44c3c7a2656de8a1e2ddda2fae71.zip |
ovl: add ovl_fiemap()
Implement stacked fiemap().
Need to split inode operations for regular file (which has fiemap) and
special file (which doesn't have fiemap).
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs')
-rw-r--r-- | fs/overlayfs/inode.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index 391e3a3b8ba1..28ee802e6eaf 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -448,6 +448,23 @@ int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags) return 0; } +static int ovl_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, + u64 start, u64 len) +{ + int err; + struct inode *realinode = ovl_inode_real(inode); + const struct cred *old_cred; + + if (!realinode->i_op->fiemap) + return -EOPNOTSUPP; + + old_cred = ovl_override_creds(inode->i_sb); + err = realinode->i_op->fiemap(realinode, fieinfo, start, len); + revert_creds(old_cred); + + return err; +} + static const struct inode_operations ovl_file_inode_operations = { .setattr = ovl_setattr, .permission = ovl_permission, @@ -455,6 +472,7 @@ static const struct inode_operations ovl_file_inode_operations = { .listxattr = ovl_listxattr, .get_acl = ovl_get_acl, .update_time = ovl_update_time, + .fiemap = ovl_fiemap, }; static const struct inode_operations ovl_symlink_inode_operations = { @@ -465,6 +483,15 @@ static const struct inode_operations ovl_symlink_inode_operations = { .update_time = ovl_update_time, }; +static const struct inode_operations ovl_special_inode_operations = { + .setattr = ovl_setattr, + .permission = ovl_permission, + .getattr = ovl_getattr, + .listxattr = ovl_listxattr, + .get_acl = ovl_get_acl, + .update_time = ovl_update_time, +}; + /* * It is possible to stack overlayfs instance on top of another * overlayfs instance as lower layer. We need to annonate the @@ -548,7 +575,7 @@ static void ovl_fill_inode(struct inode *inode, umode_t mode, dev_t rdev, break; default: - inode->i_op = &ovl_file_inode_operations; + inode->i_op = &ovl_special_inode_operations; init_special_inode(inode, mode, rdev); break; } |