Christoph Hellwig:
> That's really job for a pathconf system call that allows quering random
> paramters.
Do you mean it should be implemented such like this?
vfs_pathconf(struct dentry, int parm)
--> return d_sb->s_op->pathconf(parm)
I am afraid it is overdesign because the actual parameter(for FS) is
_PC_LINK_MAX only. All other params are already handled by VFS, glibc or
sb->statfs.
J. R. Okajima
(pathconf(3) parameters from the manual)
_PC_LINK_MAX
returns the maximum number of links to the file. If fd or path refer to a direc-
tory, then the value applies to the whole directory. The corresponding macro is
_POSIX_LINK_MAX.
_PC_MAX_CANON
returns the maximum length of a formatted input line, where fd or path must refer
to a terminal. The corresponding macro is _POSIX_MAX_CANON.
_PC_MAX_INPUT
returns the maximum length of an input line, where fd or path must refer to a ter-
minal. The corresponding macro is _POSIX_MAX_INPUT.
_PC_NAME_MAX
returns the maximum length of a filename in the directory path or fd that the pro-
cess is allowed to create. The corresponding macro is _POSIX_NAME_MAX.
_PC_PATH_MAX
returns the maximum length of a relative pathname when path or fd is the current
working directory. The corresponding macro is _POSIX_PATH_MAX.
_PC_PIPE_BUF
returns the size of the pipe buffer, where fd must refer to a pipe or FIFO and path
must refer to a FIFO. The corresponding macro is _POSIX_PIPE_BUF.
_PC_CHOWN_RESTRICTED
returns non-zero if the chown(2) call may not be used on this file. If fd or path
refer to a directory, then this applies to all files in that directory. The corre-
sponding macro is _POSIX_CHOWN_RESTRICTED.
_PC_NO_TRUNC
returns non-zero if accessing filenames longer than _POSIX_NAME_MAX generates an
error. The corresponding macro is _POSIX_NO_TRUNC.
_PC_VDISABLE
returns non-zero if special character processing can be disabled, where fd or path
must refer to a terminal.
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