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>
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@ -451,9 +451,9 @@ struct btrfs_root {
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/*
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* Inode flags
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*/
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#define BTRFS_INODE_NODATASUM 0x1
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#define BTRFS_INODE_NODATACOW 0x2
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#define BTRFS_INODE_NODATASUM (1 << 0)
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#define BTRFS_INODE_NODATACOW (1 << 1)
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#define BTRFS_INODE_READONLY (1 << 2)
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#define btrfs_clear_flag(inode, flag) (BTRFS_I(inode)->flags &= \
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~BTRFS_INODE_##flag)
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#define btrfs_set_flag(inode, flag) (BTRFS_I(inode)->flags |= \
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@ -2850,6 +2850,13 @@ out_fail:
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btrfs_throttle(root);
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return err;
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}
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static int btrfs_permission(struct inode *inode, int mask,
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struct nameidata *nd)
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{
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if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
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return -EACCES;
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return generic_permission(inode, mask, NULL);
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}
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static struct inode_operations btrfs_dir_inode_operations = {
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.lookup = btrfs_lookup,
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@ -2866,12 +2873,12 @@ static struct inode_operations btrfs_dir_inode_operations = {
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.getxattr = generic_getxattr,
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.listxattr = btrfs_listxattr,
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.removexattr = generic_removexattr,
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.permission = btrfs_permission,
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};
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static struct inode_operations btrfs_dir_ro_inode_operations = {
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.lookup = btrfs_lookup,
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.permission = btrfs_permission,
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};
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static struct file_operations btrfs_dir_file_operations = {
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.llseek = generic_file_llseek,
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.read = generic_read_dir,
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@ -2916,15 +2923,16 @@ static struct inode_operations btrfs_file_inode_operations = {
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.getxattr = generic_getxattr,
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.listxattr = btrfs_listxattr,
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.removexattr = generic_removexattr,
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.permission = btrfs_permission,
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};
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static struct inode_operations btrfs_special_inode_operations = {
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.getattr = btrfs_getattr,
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.setattr = btrfs_setattr,
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.permission = btrfs_permission,
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};
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static struct inode_operations btrfs_symlink_inode_operations = {
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.readlink = generic_readlink,
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.follow_link = page_follow_link_light,
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.put_link = page_put_link,
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.permission = btrfs_permission,
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};
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