[PATCH 12/12] fsinfo: CIFS: Return information through the filesystem info syscall
From: David Howells <hidden>
Date: 2015-11-20 14:56:51
Also in:
linux-cifs, linux-fsdevel, linux-nfs, lkml
Subsystem:
filesystems (vfs and infrastructure), ntfs filesystem, the rest · Maintainers:
Alexander Viro, Christian Brauner, Namjae Jeon, Hyunchul Lee, Linus Torvalds
Return CIFS filesystem information through the filesystem info retrieval system call. This includes the following: (1) information about the capacity and resolution of the inode timestamps; (2) information about the supported IOC flags; and unless AT_NO_ATTR_SYNC is specified: (3) the statfs information retrieved from the server. We could also return the server and/or domain name. [NOTE: THIS PATCH IS UNTESTED!] Signed-off-by: David Howells <redacted> --- fs/cifs/cifsfs.c | 25 +++++++++++++++++++++++++ fs/cifs/netmisc.c | 4 ---- fs/ntfs/time.h | 2 -- include/linux/time64.h | 2 ++ 4 files changed, 27 insertions(+), 6 deletions(-)
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index e739950ca084..213831972164 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c@@ -207,6 +207,30 @@ cifs_statfs(struct dentry *dentry, struct kstatfs *buf) return 0; } +/* + * Read filesystem information. + */ +static int cifs_get_fsinfo(struct dentry *dentry, struct fsinfo *f, + unsigned flags) +{ + f->f_namelen = PATH_MAX; + + /* Times are signed 64-bit values with a granularity of 100ns + * with a zero point of 1st Jan 1601. + */ + f->f_min_time = S64_MIN / 10000000 - NTFS_TIME_OFFSET; + f->f_max_time = S64_MAX / 10000000 - NTFS_TIME_OFFSET; + f->f_atime_gran_exponent = -7; + f->f_btime_gran_exponent = -7; + f->f_ctime_gran_exponent = -7; + f->f_mtime_gran_exponent = -7; + + f->f_supported_ioc_flags = + FS_IMMUTABLE_FL | FS_COMPR_FL | FS_HIDDEN_FL | + FS_SYSTEM_FL | FS_ARCHIVE_FL; + return 0; +} + static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len) { struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
@@ -571,6 +595,7 @@ static int cifs_drop_inode(struct inode *inode) static const struct super_operations cifs_super_ops = { .statfs = cifs_statfs, + .get_fsinfo = cifs_get_fsinfo, .alloc_inode = cifs_alloc_inode, .destroy_inode = cifs_destroy_inode, .drop_inode = cifs_drop_inode,
diff --git a/fs/cifs/netmisc.c b/fs/cifs/netmisc.c
index abae6dd2c6b9..74fdbd8d824d 100644
--- a/fs/cifs/netmisc.c
+++ b/fs/cifs/netmisc.c@@ -910,10 +910,6 @@ smbCalcSize(void *buf) 2 /* size of the bcc field */ + get_bcc(ptr)); } -/* The following are taken from fs/ntfs/util.c */ - -#define NTFS_TIME_OFFSET ((u64)(369*365 + 89) * 24 * 3600 * 10000000) - /* * Convert the NT UTC (based 1601-01-01, in hundred nanosecond units) * into Unix UTC (based 1970-01-01, in seconds).
diff --git a/fs/ntfs/time.h b/fs/ntfs/time.h
index 01233989d5d1..7b546d0615ca 100644
--- a/fs/ntfs/time.h
+++ b/fs/ntfs/time.h@@ -27,8 +27,6 @@ #include "endian.h" -#define NTFS_TIME_OFFSET ((s64)(369 * 365 + 89) * 24 * 3600 * 10000000) - /** * utc2ntfs - convert Linux UTC time to NTFS time * @ts: Linux UTC time to convert to NTFS time
diff --git a/include/linux/time64.h b/include/linux/time64.h
index 367d5af899e8..a12f6384febf 100644
--- a/include/linux/time64.h
+++ b/include/linux/time64.h@@ -6,6 +6,8 @@ typedef __s64 time64_t; +#define NTFS_TIME_OFFSET ((u64)(369*365 + 89) * 24 * 3600 * 10000000) + /* * This wants to go into uapi/linux/time.h once we agreed about the * userspace interfaces. --
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