DAOS-19249 dfs: support xattr operations on hardlinks#18611
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Store extended attributes for hardlinked files in the Global Inode Table (GIT) keyed by OID so all links share a single set of xattrs. dfs_setxattr, dfs_getxattr, dfs_removexattr and dfs_listxattr now detect when a dfs_obj carries a stale mode (opened while the entry was still a regular file) and transparently retry against GIT once the on-disk entry has been converted to a hardlink. dfs_setxattr additionally serializes concurrent hardlink conversion and xattr updates using a balanced-mode DTX when enabled, performing an explicit existence check in place of conditional akey updates. Add DFS_UNIT_TEST30 covering get/set/list/remove across stale handles and multiple links, flag semantics, persistence and post-unlink behavior. Allow-unstable-test: true Signed-off-by: Sherin T George <sherin-t.george@hpe.com>
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Ticket title is 'Add hardlink support to DFS xattr APIs' |
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Store extended attributes for hardlinked files in the Global Inode Table (GIT) keyed by OID so all links share a single set of xattrs. dfs_setxattr, dfs_getxattr, dfs_removexattr and dfs_listxattr now detect when a dfs_obj carries a stale mode (opened while the entry was still a regular file) and transparently retry against GIT once the on-disk entry has been converted to a hardlink.
dfs_setxattr additionally serializes concurrent hardlink conversion and xattr updates using a balanced-mode DTX when enabled, performing an explicit existence check in place of conditional akey updates.
Add DFS_UNIT_TEST30 covering get/set/list/remove across stale handles and multiple links, flag semantics, persistence and post-unlink behavior.
Allow-unstable-test: true
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