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nilfs2: add comments for ioctls
Add comments for ioctls in fs/nilfs2/ioctl.c file and describe NILFS2 specific ioctls in Documentation/filesystems/nilfs2.txt. Signed-off-by: Vyacheslav Dubeyko <[email protected]> Reviewed-by: Ryusuke Konishi <[email protected]> Cc: Wenliang Fan <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Vyacheslav Dubeyko
Linus Torvalds
parent
4b15d61718
commit
d623a9420c
2 changed files with 418 additions and 1 deletions
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@ -37,7 +37,26 @@
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#include "sufile.h"
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#include "dat.h"
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/**
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* nilfs_ioctl_wrap_copy - wrapping function of get/set metadata info
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* @nilfs: nilfs object
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* @argv: vector of arguments from userspace
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* @dir: set of direction flags
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* @dofunc: concrete function of get/set metadata info
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*
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* Description: nilfs_ioctl_wrap_copy() gets/sets metadata info by means of
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* calling dofunc() function on the basis of @argv argument.
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*
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* Return Value: On success, 0 is returned and requested metadata info
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* is copied into userspace. On error, one of the following
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* negative error codes is returned.
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*
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* %-EINVAL - Invalid arguments from userspace.
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*
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* %-ENOMEM - Insufficient amount of memory available.
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*
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* %-EFAULT - Failure during execution of requested operation.
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*/
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static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
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struct nilfs_argv *argv, int dir,
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ssize_t (*dofunc)(struct the_nilfs *,
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@ -107,6 +126,9 @@ static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
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return ret;
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}
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/**
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* nilfs_ioctl_getflags - ioctl to support lsattr
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*/
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static int nilfs_ioctl_getflags(struct inode *inode, void __user *argp)
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{
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unsigned int flags = NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE;
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@ -114,6 +136,9 @@ static int nilfs_ioctl_getflags(struct inode *inode, void __user *argp)
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return put_user(flags, (int __user *)argp);
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}
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/**
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* nilfs_ioctl_setflags - ioctl to support chattr
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*/
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static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp,
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void __user *argp)
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{
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@ -166,11 +191,33 @@ out:
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return ret;
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}
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/**
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* nilfs_ioctl_getversion - get info about a file's version (generation number)
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*/
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static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp)
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{
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return put_user(inode->i_generation, (int __user *)argp);
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}
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/**
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* nilfs_ioctl_change_cpmode - change checkpoint mode (checkpoint/snapshot)
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* @inode: inode object
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* @filp: file object
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* @cmd: ioctl's request code
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* @argp: pointer on argument from userspace
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*
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* Description: nilfs_ioctl_change_cpmode() function changes mode of
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* given checkpoint between checkpoint and snapshot state. This ioctl
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* is used in chcp and mkcp utilities.
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*
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* Return Value: On success, 0 is returned and mode of a checkpoint is
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* changed. On error, one of the following negative error codes
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* is returned.
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*
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* %-EPERM - Operation not permitted.
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*
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* %-EFAULT - Failure during checkpoint mode changing.
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*/
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static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
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unsigned int cmd, void __user *argp)
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{
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@ -206,6 +253,25 @@ out:
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return ret;
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}
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/**
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* nilfs_ioctl_delete_checkpoint - remove checkpoint
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* @inode: inode object
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* @filp: file object
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* @cmd: ioctl's request code
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* @argp: pointer on argument from userspace
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*
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* Description: nilfs_ioctl_delete_checkpoint() function removes
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* checkpoint from NILFS2 file system. This ioctl is used in rmcp
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* utility.
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*
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* Return Value: On success, 0 is returned and a checkpoint is
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* removed. On error, one of the following negative error codes
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* is returned.
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*
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* %-EPERM - Operation not permitted.
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*
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* %-EFAULT - Failure during checkpoint removing.
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*/
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static int
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nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
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unsigned int cmd, void __user *argp)
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@ -237,6 +303,21 @@ out:
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return ret;
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}
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/**
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* nilfs_ioctl_do_get_cpinfo - callback method getting info about checkpoints
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* @nilfs: nilfs object
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* @posp: pointer on array of checkpoint's numbers
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* @flags: checkpoint mode (checkpoint or snapshot)
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* @buf: buffer for storing checkponts' info
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* @size: size in bytes of one checkpoint info item in array
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* @nmembs: number of checkpoints in array (numbers and infos)
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*
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* Description: nilfs_ioctl_do_get_cpinfo() function returns info about
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* requested checkpoints. The NILFS_IOCTL_GET_CPINFO ioctl is used in
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* lscp utility and by nilfs_cleanerd daemon.
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*
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* Return value: count of nilfs_cpinfo structures in output buffer.
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*/
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static ssize_t
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nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
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void *buf, size_t size, size_t nmembs)
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@ -250,6 +331,27 @@ nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
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return ret;
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}
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/**
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* nilfs_ioctl_get_cpstat - get checkpoints statistics
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* @inode: inode object
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* @filp: file object
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* @cmd: ioctl's request code
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* @argp: pointer on argument from userspace
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*
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* Description: nilfs_ioctl_get_cpstat() returns information about checkpoints.
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* The NILFS_IOCTL_GET_CPSTAT ioctl is used by lscp, rmcp utilities
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* and by nilfs_cleanerd daemon.
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*
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* Return Value: On success, 0 is returned, and checkpoints information is
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* copied into userspace pointer @argp. On error, one of the following
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* negative error codes is returned.
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*
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* %-EIO - I/O error.
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*
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* %-ENOMEM - Insufficient amount of memory available.
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*
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* %-EFAULT - Failure during getting checkpoints statistics.
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*/
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static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
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unsigned int cmd, void __user *argp)
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{
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@ -268,6 +370,21 @@ static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
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return ret;
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}
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/**
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* nilfs_ioctl_do_get_suinfo - callback method getting segment usage info
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* @nilfs: nilfs object
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* @posp: pointer on array of segment numbers
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* @flags: *not used*
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* @buf: buffer for storing suinfo array
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* @size: size in bytes of one suinfo item in array
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* @nmembs: count of segment numbers and suinfos in array
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*
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* Description: nilfs_ioctl_do_get_suinfo() function returns segment usage
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* info about requested segments. The NILFS_IOCTL_GET_SUINFO ioctl is used
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* in lssu, nilfs_resize utilities and by nilfs_cleanerd daemon.
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*
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* Return value: count of nilfs_suinfo structures in output buffer.
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*/
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static ssize_t
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nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
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void *buf, size_t size, size_t nmembs)
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@ -281,6 +398,27 @@ nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
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return ret;
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}
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/**
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* nilfs_ioctl_get_sustat - get segment usage statistics
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* @inode: inode object
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* @filp: file object
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* @cmd: ioctl's request code
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* @argp: pointer on argument from userspace
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*
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* Description: nilfs_ioctl_get_sustat() returns segment usage statistics.
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* The NILFS_IOCTL_GET_SUSTAT ioctl is used in lssu, nilfs_resize utilities
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* and by nilfs_cleanerd daemon.
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*
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* Return Value: On success, 0 is returned, and segment usage information is
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* copied into userspace pointer @argp. On error, one of the following
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* negative error codes is returned.
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*
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* %-EIO - I/O error.
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*
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* %-ENOMEM - Insufficient amount of memory available.
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*
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* %-EFAULT - Failure during getting segment usage statistics.
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*/
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static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
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unsigned int cmd, void __user *argp)
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{
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@ -299,6 +437,21 @@ static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
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return ret;
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}
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/**
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* nilfs_ioctl_do_get_vinfo - callback method getting virtual blocks info
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* @nilfs: nilfs object
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* @posp: *not used*
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* @flags: *not used*
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* @buf: buffer for storing array of nilfs_vinfo structures
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* @size: size in bytes of one vinfo item in array
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* @nmembs: count of vinfos in array
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*
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* Description: nilfs_ioctl_do_get_vinfo() function returns information
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* on virtual block addresses. The NILFS_IOCTL_GET_VINFO ioctl is used
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* by nilfs_cleanerd daemon.
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*
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* Return value: count of nilfs_vinfo structures in output buffer.
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*/
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static ssize_t
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nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
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void *buf, size_t size, size_t nmembs)
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@ -311,6 +464,21 @@ nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
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return ret;
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}
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/**
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* nilfs_ioctl_do_get_bdescs - callback method getting disk block descriptors
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* @nilfs: nilfs object
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* @posp: *not used*
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* @flags: *not used*
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* @buf: buffer for storing array of nilfs_bdesc structures
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* @size: size in bytes of one bdesc item in array
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* @nmembs: count of bdescs in array
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*
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* Description: nilfs_ioctl_do_get_bdescs() function returns information
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* about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
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* is used by nilfs_cleanerd daemon.
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*
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* Return value: count of nilfs_bdescs structures in output buffer.
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*/
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static ssize_t
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nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
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void *buf, size_t size, size_t nmembs)
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@ -337,6 +505,29 @@ nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
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return nmembs;
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}
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/**
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* nilfs_ioctl_get_bdescs - get disk block descriptors
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* @inode: inode object
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* @filp: file object
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* @cmd: ioctl's request code
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* @argp: pointer on argument from userspace
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*
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* Description: nilfs_ioctl_do_get_bdescs() function returns information
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* about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
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* is used by nilfs_cleanerd daemon.
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*
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* Return Value: On success, 0 is returned, and disk block descriptors are
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* copied into userspace pointer @argp. On error, one of the following
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* negative error codes is returned.
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*
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* %-EINVAL - Invalid arguments from userspace.
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*
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* %-EIO - I/O error.
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*
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* %-ENOMEM - Insufficient amount of memory available.
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*
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* %-EFAULT - Failure during getting disk block descriptors.
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*/
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static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
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unsigned int cmd, void __user *argp)
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{
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@ -360,6 +551,26 @@ static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
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return ret;
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}
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/**
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* nilfs_ioctl_move_inode_block - prepare data/node block for moving by GC
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* @inode: inode object
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* @vdesc: descriptor of virtual block number
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* @buffers: list of moving buffers
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*
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* Description: nilfs_ioctl_move_inode_block() function registers data/node
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* buffer in the GC pagecache and submit read request.
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*
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* Return Value: On success, 0 is returned. On error, one of the following
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* negative error codes is returned.
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*
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* %-EIO - I/O error.
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*
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* %-ENOMEM - Insufficient amount of memory available.
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*
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* %-ENOENT - Requested block doesn't exist.
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*
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* %-EEXIST - Blocks conflict is detected.
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*/
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static int nilfs_ioctl_move_inode_block(struct inode *inode,
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struct nilfs_vdesc *vdesc,
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struct list_head *buffers)
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@ -405,6 +616,19 @@ static int nilfs_ioctl_move_inode_block(struct inode *inode,
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return 0;
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}
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/**
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* nilfs_ioctl_move_blocks - move valid inode's blocks during garbage collection
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* @sb: superblock object
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* @argv: vector of arguments from userspace
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* @buf: array of nilfs_vdesc structures
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*
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* Description: nilfs_ioctl_move_blocks() function reads valid data/node
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* blocks that garbage collector specified with the array of nilfs_vdesc
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* structures and stores them into page caches of GC inodes.
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*
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* Return Value: Number of processed nilfs_vdesc structures or
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* error code, otherwise.
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*/
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static int nilfs_ioctl_move_blocks(struct super_block *sb,
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struct nilfs_argv *argv, void *buf)
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{
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@ -470,6 +694,25 @@ static int nilfs_ioctl_move_blocks(struct super_block *sb,
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return ret;
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}
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/**
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* nilfs_ioctl_delete_checkpoints - delete checkpoints
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* @nilfs: nilfs object
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* @argv: vector of arguments from userspace
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* @buf: array of periods of checkpoints numbers
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*
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* Description: nilfs_ioctl_delete_checkpoints() function deletes checkpoints
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* in the period from p_start to p_end, excluding p_end itself. The checkpoints
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* which have been already deleted are ignored.
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*
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* Return Value: Number of processed nilfs_period structures or
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* error code, otherwise.
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*
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* %-EIO - I/O error.
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*
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* %-ENOMEM - Insufficient amount of memory available.
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*
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* %-EINVAL - invalid checkpoints.
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*/
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static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
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struct nilfs_argv *argv, void *buf)
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{
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@ -487,6 +730,24 @@ static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
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return nmembs;
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}
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/**
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* nilfs_ioctl_free_vblocknrs - free virtual block numbers
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* @nilfs: nilfs object
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* @argv: vector of arguments from userspace
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* @buf: array of virtual block numbers
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*
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* Description: nilfs_ioctl_free_vblocknrs() function frees
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* the virtual block numbers specified by @buf and @argv->v_nmembs.
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*
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* Return Value: Number of processed virtual block numbers or
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* error code, otherwise.
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*
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* %-EIO - I/O error.
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*
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* %-ENOMEM - Insufficient amount of memory available.
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*
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* %-ENOENT - The virtual block number have not been allocated.
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*/
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static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
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struct nilfs_argv *argv, void *buf)
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{
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@ -498,6 +759,24 @@ static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
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return (ret < 0) ? ret : nmembs;
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}
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/**
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* nilfs_ioctl_mark_blocks_dirty - mark blocks dirty
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* @nilfs: nilfs object
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* @argv: vector of arguments from userspace
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* @buf: array of block descriptors
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*
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* Description: nilfs_ioctl_mark_blocks_dirty() function marks
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* metadata file or data blocks as dirty.
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*
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* Return Value: Number of processed block descriptors or
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* error code, otherwise.
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*
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* %-ENOMEM - Insufficient memory available.
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*
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* %-EIO - I/O error
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*
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* %-ENOENT - the specified block does not exist (hole block)
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*/
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static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
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struct nilfs_argv *argv, void *buf)
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{
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@ -579,6 +858,20 @@ int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
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return ret;
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}
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/**
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* nilfs_ioctl_clean_segments - clean segments
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* @inode: inode object
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* @filp: file object
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* @cmd: ioctl's request code
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* @argp: pointer on argument from userspace
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*
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* Description: nilfs_ioctl_clean_segments() function makes garbage
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* collection operation in the environment of requested parameters
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* from userspace. The NILFS_IOCTL_CLEAN_SEGMENTS ioctl is used by
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* nilfs_cleanerd daemon.
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*
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* Return Value: On success, 0 is returned or error code, otherwise.
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*/
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static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
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unsigned int cmd, void __user *argp)
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{
|
||||
|
|
@ -690,6 +983,33 @@ out:
|
|||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* nilfs_ioctl_sync - make a checkpoint
|
||||
* @inode: inode object
|
||||
* @filp: file object
|
||||
* @cmd: ioctl's request code
|
||||
* @argp: pointer on argument from userspace
|
||||
*
|
||||
* Description: nilfs_ioctl_sync() function constructs a logical segment
|
||||
* for checkpointing. This function guarantees that all modified data
|
||||
* and metadata are written out to the device when it successfully
|
||||
* returned.
|
||||
*
|
||||
* Return Value: On success, 0 is retured. On errors, one of the following
|
||||
* negative error code is returned.
|
||||
*
|
||||
* %-EROFS - Read only filesystem.
|
||||
*
|
||||
* %-EIO - I/O error
|
||||
*
|
||||
* %-ENOSPC - No space left on device (only in a panic state).
|
||||
*
|
||||
* %-ERESTARTSYS - Interrupted.
|
||||
*
|
||||
* %-ENOMEM - Insufficient memory available.
|
||||
*
|
||||
* %-EFAULT - Failure during execution of requested operation.
|
||||
*/
|
||||
static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
|
||||
unsigned int cmd, void __user *argp)
|
||||
{
|
||||
|
|
@ -718,6 +1038,14 @@ static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
|
|||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* nilfs_ioctl_resize - resize NILFS2 volume
|
||||
* @inode: inode object
|
||||
* @filp: file object
|
||||
* @argp: pointer on argument from userspace
|
||||
*
|
||||
* Return Value: On success, 0 is returned or error code, otherwise.
|
||||
*/
|
||||
static int nilfs_ioctl_resize(struct inode *inode, struct file *filp,
|
||||
void __user *argp)
|
||||
{
|
||||
|
|
@ -743,6 +1071,17 @@ out:
|
|||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* nilfs_ioctl_set_alloc_range - limit range of segments to be allocated
|
||||
* @inode: inode object
|
||||
* @argp: pointer on argument from userspace
|
||||
*
|
||||
* Decription: nilfs_ioctl_set_alloc_range() function defines lower limit
|
||||
* of segments in bytes and upper limit of segments in bytes.
|
||||
* The NILFS_IOCTL_SET_ALLOC_RANGE is used by nilfs_resize utility.
|
||||
*
|
||||
* Return Value: On success, 0 is returned or error code, otherwise.
|
||||
*/
|
||||
static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
|
||||
{
|
||||
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
|
||||
|
|
@ -775,6 +1114,28 @@ out:
|
|||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* nilfs_ioctl_get_info - wrapping function of get metadata info
|
||||
* @inode: inode object
|
||||
* @filp: file object
|
||||
* @cmd: ioctl's request code
|
||||
* @argp: pointer on argument from userspace
|
||||
* @membsz: size of an item in bytes
|
||||
* @dofunc: concrete function of getting metadata info
|
||||
*
|
||||
* Description: nilfs_ioctl_get_info() gets metadata info by means of
|
||||
* calling dofunc() function.
|
||||
*
|
||||
* Return Value: On success, 0 is returned and requested metadata info
|
||||
* is copied into userspace. On error, one of the following
|
||||
* negative error codes is returned.
|
||||
*
|
||||
* %-EINVAL - Invalid arguments from userspace.
|
||||
*
|
||||
* %-ENOMEM - Insufficient amount of memory available.
|
||||
*
|
||||
* %-EFAULT - Failure during execution of requested operation.
|
||||
*/
|
||||
static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
|
||||
unsigned int cmd, void __user *argp,
|
||||
size_t membsz,
|
||||
|
|
|
|||
Loading…
Reference in a new issue