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[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry
Give the statfs superblock operation a dentry pointer rather than a superblock pointer. This complements the get_sb() patch. That reduced the significance of sb->s_root, allowing NFS to place a fake root there. However, NFS does require a dentry to use as a target for the statfs operation. This permits the root in the vfsmount to be used instead. linux/mount.h has been added where necessary to make allyesconfig build successfully. Interest has also been expressed for use with the FUSE and XFS filesystems. Signed-off-by: David Howells <[email protected]> Acked-by: Al Viro <[email protected]> Cc: Nathan Scott <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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60 changed files with 175 additions and 144 deletions
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@ -49,7 +49,7 @@ static int befs_nls2utf(struct super_block *sb, const char *in, int in_len,
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char **out, int *out_len);
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static void befs_put_super(struct super_block *);
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static int befs_remount(struct super_block *, int *, char *);
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static int befs_statfs(struct super_block *, struct kstatfs *);
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static int befs_statfs(struct dentry *, struct kstatfs *);
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static int parse_options(char *, befs_mount_options *);
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static const struct super_operations befs_sops = {
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@ -880,8 +880,9 @@ befs_remount(struct super_block *sb, int *flags, char *data)
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}
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static int
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befs_statfs(struct super_block *sb, struct kstatfs *buf)
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befs_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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struct super_block *sb = dentry->d_sb;
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befs_debug(sb, "---> befs_statfs()");
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