lkml.org 
[lkml]   [2015]   [Nov]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Subject[PATCH 12/12] fsinfo: CIFS: Return information through the filesystem info syscall
    From
    Date
    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 <dhowells@redhat.com>
    ---

    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.


    \
     
     \ /
      Last update: 2015-11-20 16:21    [W:4.143 / U:0.068 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site