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Btrfs: Add readonly inode flag 

This patch adds readonly inode flag support.  A file with this flag
can't be modified, but can be deleted.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yan 2008-01-14 13:26:08 -05:00 committed by Chris Mason
parent 744f52f997
commit fdebe2bd70
2 changed files with 15 additions and 7 deletions
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6
fs/btrfs/ctree.h
View File

@ -451,9 +451,9 @@ struct btrfs_root {
/*
* Inode flags
*/
#define BTRFS_INODE_NODATASUM 0x1
#define BTRFS_INODE_NODATACOW 0x2
#define BTRFS_INODE_NODATASUM (1 << 0)
#define BTRFS_INODE_NODATACOW (1 << 1)
#define BTRFS_INODE_READONLY (1 << 2)
#define btrfs_clear_flag(inode, flag) (BTRFS_I(inode)->flags &= \
~BTRFS_INODE_##flag)
#define btrfs_set_flag(inode, flag) (BTRFS_I(inode)->flags |= \

16
fs/btrfs/inode.c
View File

@ -2850,6 +2850,13 @@ out_fail:
btrfs_throttle(root);
return err;
}
static int btrfs_permission(struct inode *inode, int mask,
struct nameidata *nd)
{
if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
return -EACCES;
return generic_permission(inode, mask, NULL);
}
static struct inode_operations btrfs_dir_inode_operations = {
.lookup = btrfs_lookup,
@ -2866,12 +2873,12 @@ static struct inode_operations btrfs_dir_inode_operations = {
.getxattr = generic_getxattr,
.listxattr = btrfs_listxattr,
.removexattr = generic_removexattr,
.permission = btrfs_permission,
};
static struct inode_operations btrfs_dir_ro_inode_operations = {
.lookup = btrfs_lookup,
.permission = btrfs_permission,
};
static struct file_operations btrfs_dir_file_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
@ -2916,15 +2923,16 @@ static struct inode_operations btrfs_file_inode_operations = {
.getxattr = generic_getxattr,
.listxattr = btrfs_listxattr,
.removexattr = generic_removexattr,
.permission = btrfs_permission,
};
static struct inode_operations btrfs_special_inode_operations = {
.getattr = btrfs_getattr,
.setattr = btrfs_setattr,
.permission = btrfs_permission,
};
static struct inode_operations btrfs_symlink_inode_operations = {
.readlink = generic_readlink,
.follow_link = page_follow_link_light,
.put_link = page_put_link,
.permission = btrfs_permission,
};