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lib/btrfs.c
90 строк
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Alejandro Colomar
lib/, src/: Move btrfs.c prototypes to lib/btrfs.h
23 апр 2026, 15:17
23 апр 2026, 15:17
96460c7
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#include "config.h" #include "btrfs.h" #include <linux/btrfs_tree.h> #include <linux/magic.h> #include <sys/statfs.h> #include <stdbool.h> #include "prototypes.h" #define PATH_ENV "/usr/bin/env" static int run_btrfs_subvolume_cmd(const char *subcmd, const char *arg1, const char *arg2) { int status = 0; const char *cmd = PATH_ENV; const char *argv[] = { "env", "btrfs", "subvolume", subcmd, arg1, arg2, NULL }; if (access(cmd, X_OK) == -1) return 1; if (run_command(cmd, argv, NULL, &status)) return -1; return status; } int btrfs_create_subvolume(const char *path) { return run_btrfs_subvolume_cmd("create", path, NULL); } int btrfs_remove_subvolume(const char *path) { return run_btrfs_subvolume_cmd("delete", "-C", path); } /* Adapted from btrfsprogs */ /* * This intentionally duplicates btrfs_util_is_subvolume_fd() instead of opening * a file descriptor and calling it, because fstat() and fstatfs() don't accept * file descriptors opened with O_PATH on old kernels (before v3.6 and before * v3.12, respectively), but stat() and statfs() can be called on a path that * the user doesn't have read or write permissions to. * * returns: * 1 - btrfs subvolume * 0 - not btrfs subvolume * -1 - error */ int btrfs_is_subvolume(const char *path) { struct stat st; struct statfs sfs; if (statfs(path, &sfs) == -1) return -1; if (!is_btrfs(&sfs)) return 0; if (stat(path, &st) == -1) return -1; if (st.st_ino != BTRFS_FIRST_FREE_OBJECTID || !S_ISDIR(st.st_mode)) { return 0; } return 1; } bool is_btrfs(const struct statfs *sfs) { return sfs->f_type == BTRFS_SUPER_MAGIC; }