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Merge tag 'ovl-update-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs

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Pull overlayfs updates from Miklos Szeredi:
 "This contains two new features:

   - Stack file operations: this allows removal of several hacks from
     the VFS, proper interaction of read-only open files with copy-up,
     possibility to implement fs modifying ioctls properly, and others.

   - Metadata only copy-up: when file is on lower layer and only
     metadata is modified (except size) then only copy up the metadata
     and continue to use the data from the lower file"

* tag 'ovl-update-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs: (66 commits)
  ovl: Enable metadata only feature
  ovl: Do not do metacopy only for ioctl modifying file attr
  ovl: Do not do metadata only copy-up for truncate operation
  ovl: add helper to force data copy-up
  ovl: Check redirect on index as well
  ovl: Set redirect on upper inode when it is linked
  ovl: Set redirect on metacopy files upon rename
  ovl: Do not set dentry type ORIGIN for broken hardlinks
  ovl: Add an inode flag OVL_CONST_INO
  ovl: Treat metacopy dentries as type OVL_PATH_MERGE
  ovl: Check redirects for metacopy files
  ovl: Move some dir related ovl_lookup_single() code in else block
  ovl: Do not expose metacopy only dentry from d_real()
  ovl: Open file with data except for the case of fsync
  ovl: Add helper ovl_inode_realdata()
  ovl: Store lower data inode in ovl_inode
  ovl: Fix ovl_getattr() to get number of blocks from lower
  ovl: Add helper ovl_dentry_lowerdata() to get lower data dentry
  ovl: Copy up meta inode data from lowest data inode
  ovl: Modify ovl_lookup() and friends to lookup metacopy dentry
  ...
This commit is contained in:
Linus Torvalds
2018-08-21 18:19:09 -07:00
parent c22fc16d17 989974c804
commit d9a185f8b4
33 changed files with 1624 additions and 600 deletions
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29
fs/xfs/xfs_file.c
View File

@@ -931,31 +931,16 @@ xfs_file_clone_range(
len, false);
}
STATIC ssize_t
STATIC int
xfs_file_dedupe_range(
struct file *src_file,
u64 loff,
u64 len,
struct file *dst_file,
u64 dst_loff)
struct file *file_in,
loff_t pos_in,
struct file *file_out,
loff_t pos_out,
u64 len)
{
struct inode *srci = file_inode(src_file);
u64 max_dedupe;
int error;
/*
* Since we have to read all these pages in to compare them, cut
* it off at MAX_RW_COUNT/2 rounded down to the nearest block.
* That means we won't do more than MAX_RW_COUNT IO per request.
*/
max_dedupe = (MAX_RW_COUNT >> 1) & ~(i_blocksize(srci) - 1);
if (len > max_dedupe)
len = max_dedupe;
error = xfs_reflink_remap_range(src_file, loff, dst_file, dst_loff,
return xfs_reflink_remap_range(file_in, pos_in, file_out, pos_out,
len, true);
if (error)
return error;
return len;
}
STATIC int