[PATCH v7 0/5] erofs: cleanup of xattr handling

[Jingbo Xu]

changes since v6:
- patch 1: s/__u32/__le32 in calculation of it->pos (Gao Xiang)
- patch 4: polish the commit message (Gao Xiang)
- patch 5: s/erofs_xattr_handle_string/erofs_xattr_copy_to_buffer (Gao
  Xiang)


changes since v5:
- patch 1: newly added into this series, in preparation for the
  following cleanup
- patch 5: rename erofs_xattr_body() to erofs_xattr_handle_string()

changes since v4:
- patch 1: make conversions from erofs_read_metabuf() in xattr.c
  to "erofs_init_metabuf() + erofs_bread()" a separate patch
- patch 6: add "bool copy" function parameter to erofs_xattr_body(), and
  thus make erofs_xattr_namematch() and erofs_xattr_copy() inlined
  inside erofs_xattr_body()

changes since v3:
- patch 1: make a unified erofs_xattr_iter_fixup() API with newly
  introduced "bool nospan" argument; call erofs_init_metabuf() and
  erofs_bread() separately instead of erofs_read_metabuf()
- patch 2: avoid duplicated strlen() calculation in erofs_getxattr(); no
  need zeroing other fields when initializing 'struct erofs_xattr_iter'
- patch 4: don't explode 'struct erofs_xattr_iter' with inode/getxattr
  fields; instead pass inode/getxattr parameters through function
  parameters of erofs_iter_[inline|shared]_xattr()
- patch 5: don't explode 'struct erofs_xattr_iter' with remaining field;
  instead  calculate and check the remaining inside
  erofs_iter_inline_xattr()

changes since v2:
- rebase to v6.4-rc2
- passes xattr tests (erofs/019,020,021) of erofs-utils [1]

[1] https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs-utils.git/log/?h=experimental-tests

v6: https://lore.kernel.org/all/20230608113020.66626-1-jefflexu@linux.alibaba.com/
v5: https://lore.kernel.org/all/20230601024347.108469-1-jefflexu@linux.alibaba.com/
v4: https://lore.kernel.org/all/20230531031330.3504-1-jefflexu@linux.alibaba.com/
v3: https://lore.kernel.org/lkml/20230518024551.123990-1-jefflexu@linux.alibaba.com/
v2: https://lore.kernel.org/all/20230330082910.125374-1-jefflexu@linux.alibaba.com/
v1: https://lore.kernel.org/all/20230323000949.57608-1-jefflexu@linux.alibaba.com/



Jingbo Xu (5):
  erofs: use absolute position in xattr iterator
  erofs: unify xattr_iter structures
  erofs: make the size of read data stored in buffer_ofs
  erofs: unify inline/shared xattr iterators for listxattr/getxattr
  erofs: use separate xattr parsers for listxattr/getxattr

 fs/erofs/xattr.c | 662 +++++++++++++++++------------------------------
 1 file changed, 235 insertions(+), 427 deletions(-)

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2.19.1.6.gb485710b