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repart: support "nodatacow" in btrfs subvolumes

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In btrfs-progs 6.15 it is planned to add a new parameter in mkfs.btrfs
--inode-flags, that can set attributes for subvolumes, directories, and
files.

The current supported attributes are "nodatacow", to disable CoW, and
"nodatasum", to disable the checksum.

This commit extend the "Subvolunes=" option to understand the
"nodatacow" flag for subvolums only.

If RepartOffline is enabled it will build the image without loopback
devices, using the correct --inode-flags parameters.

If RepartOffline is disabled it will use loopback devices and set the
btrfs attributes accordingly.

Signed-off-by: Alberto Planas <aplanas@suse.com>
This commit is contained in:
Alberto Planas
2025-11-02 17:13:31 +09:00
committed by Yu Watanabe
parent eeedea94da
commit ab1f4e506f
7 changed files with 132 additions and 57 deletions
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src/basic/mkdir.h
+1 -1
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@@ -22,7 +22,7 @@ static inline int mkdir_parents(const char *path, mode_t mode) {
int mkdir_parents_safe(const char *prefix, const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags);
int mkdir_p(const char *path, mode_t mode);
int mkdir_p_safe(const char *prefix, const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags);
int mkdir_p_root_full(const char *root, const char *p, uid_t uid, gid_t gid, mode_t m, usec_t ts, char **subvolumes);
int mkdir_p_root_full(const char *root, const char *p, uid_t uid, gid_t gid, mode_t m, usec_t ts, Hashmap *subvolumes);
static inline int mkdir_p_root(const char *root, const char *p, uid_t uid, gid_t gid, mode_t m) {
return mkdir_p_root_full(root, p, uid, gid, m, USEC_INFINITY, NULL);
}