sys_fsconfig(9)

💅 sys_fsconfig(9) 💅

okay so bestie, this is the Kernel API Manual page for sys_fsconfig, and we are gonna go through it together — no cap, every detail stays. 🫶

🌸 NAME 🌸

sys_fsconfig — Set parameters and trigger actions on a context

✨ SYNOPSIS ✨

long sys_fsconfig (int fd , unsigned int cmd , const char __user * _key
       , const void __user * _value , int aux );

🎀 ARGUMENTS 🎀

• fd — The filesystem context to act upon.
• cmd — The action to take.
• _key — Where appropriate, the parameter key to set.
• _value — Where appropriate, the parameter value to set.
• aux — Additional information for the value.

🦋 DESCRIPTION 🦋

This system call is used to set parameters on a context, including superblock settings, data source and security labelling.

Actions include triggering the creation of a superblock and the reconfiguration of the superblock attached to the specified context.

When setting a parameter, cmd indicates the type of value being proposed and _key indicates the parameter to be altered.

_value and aux are used to specify the value, should a value be required:

• fsconfig_set_flag — No value is specified. The parameter must be boolean in nature. The key may be prefixed with "no" to invert the setting. _value must be NULL and aux must be 0.
• fsconfig_set_string — A string value is specified. The parameter can be expecting boolean, integer, string or take a path. A conversion to an appropriate type will be attempted (which may include looking up as a path). _value points to a NUL-terminated string and aux must be 0.
• fsconfig_set_binary — A binary blob is specified. _value points to the blob and aux indicates its size. The parameter must be expecting a blob.
• fsconfig_set_path — A non-empty path is specified. The parameter must be expecting a path object. _value points to a NUL-terminated string that is the path and aux is a file descriptor at which to start a relative lookup or AT_FDCWD.
• fsconfig_set_path_empty — As fsconfig_set_path, but with AT_EMPTY_PATH implied.
• fsconfig_set_fd — An open file descriptor is specified. _value must be NULL and aux indicates the file descriptor.

🔍 SEE ALSO 🔍

• Kernel file ./fs/fsopen.c

okay bye bestie 💖 this page came from ./fs, dated October 2026, and it's sys_fsconfig(9) — mwah! 💋✨