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| author | Peter Xu <peterx@redhat.com> | 2023-04-19 12:17:36 -0400 |
|---|---|---|
| committer | Juan Quintela <quintela@redhat.com> | 2023-04-24 11:29:00 +0200 |
| commit | fa45f8dab9613993c042176ea2d25552bfebc955 (patch) | |
| tree | 09908fc64511b6020efff4f8539998f65cfc75b2 | |
| parent | 403d18ae384239876764bbfa111d6cc5dcb673d1 (diff) | |
| download | qemu-fa45f8dab9613993c042176ea2d25552bfebc955.zip qemu-fa45f8dab9613993c042176ea2d25552bfebc955.tar.gz qemu-fa45f8dab9613993c042176ea2d25552bfebc955.tar.bz2 | |
util/mmap-alloc: qemu_fd_getfs()
This new helper fetches file system type for a fd. Only Linux is
implemented so far. Currently only tmpfs and hugetlbfs are defined,
but it can grow as needed.
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
| -rw-r--r-- | include/qemu/mmap-alloc.h | 7 | ||||
| -rw-r--r-- | util/mmap-alloc.c | 28 |
2 files changed, 35 insertions, 0 deletions
diff --git a/include/qemu/mmap-alloc.h b/include/qemu/mmap-alloc.h index 2825e23..8344daa 100644 --- a/include/qemu/mmap-alloc.h +++ b/include/qemu/mmap-alloc.h @@ -1,8 +1,15 @@ #ifndef QEMU_MMAP_ALLOC_H #define QEMU_MMAP_ALLOC_H +typedef enum { + QEMU_FS_TYPE_UNKNOWN = 0, + QEMU_FS_TYPE_TMPFS, + QEMU_FS_TYPE_HUGETLBFS, + QEMU_FS_TYPE_NUM, +} QemuFsType; size_t qemu_fd_getpagesize(int fd); +QemuFsType qemu_fd_getfs(int fd); /** * qemu_ram_mmap: mmap anonymous memory, the specified file or device. diff --git a/util/mmap-alloc.c b/util/mmap-alloc.c index 5ed7d29..ed14f9c 100644 --- a/util/mmap-alloc.c +++ b/util/mmap-alloc.c @@ -27,8 +27,36 @@ #ifdef CONFIG_LINUX #include <sys/vfs.h> +#include <linux/magic.h> #endif +QemuFsType qemu_fd_getfs(int fd) +{ +#ifdef CONFIG_LINUX + struct statfs fs; + int ret; + + if (fd < 0) { + return QEMU_FS_TYPE_UNKNOWN; + } + + do { + ret = fstatfs(fd, &fs); + } while (ret != 0 && errno == EINTR); + + switch (fs.f_type) { + case TMPFS_MAGIC: + return QEMU_FS_TYPE_TMPFS; + case HUGETLBFS_MAGIC: + return QEMU_FS_TYPE_HUGETLBFS; + default: + return QEMU_FS_TYPE_UNKNOWN; + } +#else + return QEMU_FS_TYPE_UNKNOWN; +#endif +} + size_t qemu_fd_getpagesize(int fd) { #ifdef CONFIG_LINUX |