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Btrfs: implement FS_IOC_GETFLAGS/SETFLAGS/GETVERSION

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Add support for the standard attributes set via chattr and read via
lsattr.  Currently we store the attributes in the flags value in
the btrfs inode, but I wonder whether we should split it into two so
that we don't have to keep converting between the two formats.

Remove the btrfs_clear_flag/btrfs_set_flag/btrfs_test_flag macros
as they were confusing the existing code and got in the way of the
new additions.

Also add the FS_IOC_GETVERSION ioctl for getting i_generation as it's
trivial.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Christoph Hellwig 2009-04-17 10:37:41 +02:00 • committed by Chris Mason
parent c289811cc0
commit 6cbff00f46
5 changed files with 200 additions and 21 deletions
Download patch file Download diff file Expand all files Collapse all files

27
fs/btrfs/inode.c
View file

@ -368,7 +368,7 @@ again:
* inode has not been flagged as nocompress. This flag can
* change at any time if we discover bad compression ratios.
*/
if (!btrfs_test_flag(inode, NOCOMPRESS) &&
if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS) &&
btrfs_test_opt(root, COMPRESS)) {
WARN_ON(pages);
pages = kzalloc(sizeof(struct page *) * nr_pages, GFP_NOFS);
@ -469,7 +469,7 @@ again:
nr_pages_ret = 0;
/* flag the file so we don't compress in the future */
btrfs_set_flag(inode, NOCOMPRESS);
BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
}
if (will_compress) {
*num_added += 1;
@ -862,7 +862,7 @@ static int cow_file_range_async(struct inode *inode, struct page *locked_page,
async_cow->locked_page = locked_page;
async_cow->start = start;
if (btrfs_test_flag(inode, NOCOMPRESS))
if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS)
cur_end = end;
else
cur_end = min(end, start + 512 * 1024 - 1);
@ -1133,10 +1133,10 @@ static int run_delalloc_range(struct inode *inode, struct page *locked_page,
int ret;
struct btrfs_root *root = BTRFS_I(inode)->root;
if (btrfs_test_flag(inode, NODATACOW))
if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW)
ret = run_delalloc_nocow(inode, locked_page, start, end,
page_started, 1, nr_written);
else if (btrfs_test_flag(inode, PREALLOC))
else if (BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC)
ret = run_delalloc_nocow(inode, locked_page, start, end,
page_started, 0, nr_written);
else if (!btrfs_test_opt(root, COMPRESS))
@ -1290,7 +1290,7 @@ static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
int ret = 0;
int skip_sum;
skip_sum = btrfs_test_flag(inode, NODATASUM);
skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
BUG_ON(ret);
@ -1790,7 +1790,8 @@ static int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
ClearPageChecked(page);
goto good;
}
if (btrfs_test_flag(inode, NODATASUM))
if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)
return 0;
if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID &&
@ -2156,6 +2157,8 @@ static void btrfs_read_locked_inode(struct inode *inode)
init_special_inode(inode, inode->i_mode, rdev);
break;
}
btrfs_update_iflags(inode);
return;
make_bad:
@ -3586,9 +3589,9 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
btrfs_find_block_group(root, 0, alloc_hint, owner);
if ((mode & S_IFREG)) {
if (btrfs_test_opt(root, NODATASUM))
btrfs_set_flag(inode, NODATASUM);
BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
if (btrfs_test_opt(root, NODATACOW))
btrfs_set_flag(inode, NODATACOW);
BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
}
key[0].objectid = objectid;
@ -3642,6 +3645,8 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
location->offset = 0;
btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
btrfs_inherit_iflags(inode, dir);
insert_inode_hash(inode);
inode_tree_add(inode);
return inode;
@ -5075,7 +5080,7 @@ static int prealloc_file_range(struct btrfs_trans_handle *trans,
out:
if (cur_offset > start) {
inode->i_ctime = CURRENT_TIME;
btrfs_set_flag(inode, PREALLOC);
BTRFS_I(inode)->flags |= BTRFS_INODE_PREALLOC;
if (!(mode & FALLOC_FL_KEEP_SIZE) &&
cur_offset > i_size_read(inode))
btrfs_i_size_write(inode, cur_offset);
@ -5196,7 +5201,7 @@ static int btrfs_set_page_dirty(struct page *page)
static int btrfs_permission(struct inode *inode, int mask)
{
if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
if ((BTRFS_I(inode)->flags & BTRFS_INODE_READONLY) && (mask & MAY_WRITE))
return -EACCES;
return generic_permission(inode, mask, btrfs_check_acl);
}