[PATCH v8 0/2] mkfs: add ability to populate filesystem from directory

[Luca Di Maio <luca.dimaio1@gmail.com>]

Currently the only way to pre populate an XFS partition is via the
prototype file. While it works it has some limitations like:
  - not allowed spaces in file names
  - not preserving timestamps of original inodes

This series adds a new -P option to mkfs.xfs that allows users to
populate a newly created filesystem directly from an existing directory.
While similar to the prototype functionality, this doesn't require
writing a prototype file.
The implementation preserves file and directory attributes (ownership,
permissions, timestamps) from the source directory when copying content
to the new filesystem.

[v1] -> [v2]
  remove changes to protofile spec
  ensure backward compatibility
[v2] -> [v3]
  use inode_set_[acm]time() as suggested
  avoid copying atime and ctime
  they are often problematic for reproducibility, and
  mtime is the important information to preserve anyway
[v3] -> [v4]
  rewrite functionality to populate directly from an input directory
  this is similar to mkfs.ext4 option.
[v4] -> [v5]
  reorder patch to make it easier to review
  reflow to keep code below 80 chars
  use _() macro in prints
add SPDX headers to new files
  fix comment styling
  move from typedef to structs
  move direntry handling to own function
[v5] -> [v6]
  rebase on 6.14
[v6] -> [v7]
  move functionality to common -p flag
  add noatime flag to skip atime copy and set to current time
  set ctime/crtime to current time
  preserve hardlinks
  preserve extended attributes for all file/dir types
  add fsxattr to copied files/dirs
[v7] -> [v8]
  changed directory source validation to use stat() instead of open()
  changed hardlink tracker to store inode numbers instead of inode pointers
  fixed path buffer handling for directory traversal
  handle blocking FIFOs filetypes
  handle hardlinks of symlinks
  improve setup_proto and parse proto using structured xfs_proto_source type
  renamed noatime to preserve_atime with inverted logic
  specify EBADF fgetxattr() and flistxattr() fallback for O_PATH fds
  switch to calloc() to initialize hardlinks_tracker
  switch to reallocarray() for hardlinks_tracker resize

Luca Di Maio (2):
  proto: add ability to populate a filesystem from a directory
  mkfs: modify -p flag to populate a filesystem from a directory

 man/man8/mkfs.xfs.8.in |  41 ++-
 mkfs/proto.c           | 754 ++++++++++++++++++++++++++++++++++++++++-
 mkfs/proto.h           |  18 +-
 mkfs/xfs_mkfs.c        |  23 +-
 4 files changed, 804 insertions(+), 32 deletions(-)

--
2.49.0