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Message-ID: <5996d6854a16852daca5977063af6f2af2f0f4ca.1733902742.git.ojaswin@linux.ibm.com> Date: Wed, 11 Dec 2024 13:24:02 +0530 From: Ojaswin Mujoo <ojaswin@...ux.ibm.com> To: linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org Cc: Ritesh Harjani <ritesh.list@...il.com>, linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, Andrey Albershteyn <aalbersh@...nel.org>, "Darrick J . Wong" <djwong@...nel.org>, John Garry <john.g.garry@...cle.com> Subject: [RFC 1/3] include/linux.h: Factor out generic platform_test_fs_fd() helper Factor our the generic code to detect the FS type out of platform_test_fs_fd(). This can then be used to detect different file systems types based on magic number. Also, add a helper to detect if the fd is from an ext4 filesystem. Signed-off-by: Ojaswin Mujoo <ojaswin@...ux.ibm.com> --- include/linux.h | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) diff --git a/include/linux.h b/include/linux.h index e9eb7bfb26a1..52c64014c57f 100644 --- a/include/linux.h +++ b/include/linux.h @@ -43,13 +43,7 @@ static __inline__ int xfsctl(const char *path, int fd, int cmd, void *p) return ioctl(fd, cmd, p); } -/* - * platform_test_xfs_*() implies that xfsctl will succeed on the file; - * on Linux, at least, special files don't get xfs file ops, - * so return 0 for those - */ - -static __inline__ int platform_test_xfs_fd(int fd) +static __inline__ int platform_test_fs_fd(int fd, long type) { struct statfs statfsbuf; struct stat statbuf; @@ -60,7 +54,22 @@ static __inline__ int platform_test_xfs_fd(int fd) return 0; if (!S_ISREG(statbuf.st_mode) && !S_ISDIR(statbuf.st_mode)) return 0; - return (statfsbuf.f_type == 0x58465342); /* XFSB */ + return (statfsbuf.f_type == type); +} + +/* + * platform_test_xfs_*() implies that xfsctl will succeed on the file; + * on Linux, at least, special files don't get xfs file ops, + * so return 0 for those + */ +static __inline__ int platform_test_xfs_fd(int fd) +{ + return platform_test_fs_fd(fd, 0x58465342); /* XFSB */ +} + +static __inline__ int platform_test_ext4_fd(int fd) +{ + return platform_test_fs_fd(fd, 0xef53); /* EXT4 magic number */ } static __inline__ int platform_test_xfs_path(const char *path) -- 2.43.5
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