diff options
Diffstat (limited to 'fs/btrfs/props.c')
-rw-r--r-- | fs/btrfs/props.c | 99 |
1 files changed, 56 insertions, 43 deletions
diff --git a/fs/btrfs/props.c b/fs/btrfs/props.c index 1a6d2d5b4b33..a2ec8ecae8de 100644 --- a/fs/btrfs/props.c +++ b/fs/btrfs/props.c @@ -17,9 +17,11 @@ static DEFINE_HASHTABLE(prop_handlers_ht, BTRFS_PROP_HANDLERS_HT_BITS); struct prop_handler { struct hlist_node node; const char *xattr_name; - int (*validate)(const char *value, size_t len); + int (*validate)(const struct btrfs_inode *inode, const char *value, + size_t len); int (*apply)(struct inode *inode, const char *value, size_t len); const char *(*extract)(struct inode *inode); + bool (*ignore)(const struct btrfs_inode *inode); int inheritable; }; @@ -55,7 +57,8 @@ find_prop_handler(const char *name, return NULL; } -int btrfs_validate_prop(const char *name, const char *value, size_t value_len) +int btrfs_validate_prop(const struct btrfs_inode *inode, const char *name, + const char *value, size_t value_len) { const struct prop_handler *handler; @@ -69,7 +72,29 @@ int btrfs_validate_prop(const char *name, const char *value, size_t value_len) if (value_len == 0) return 0; - return handler->validate(value, value_len); + return handler->validate(inode, value, value_len); +} + +/* + * Check if a property should be ignored (not set) for an inode. + * + * @inode: The target inode. + * @name: The property's name. + * + * The caller must be sure the given property name is valid, for example by + * having previously called btrfs_validate_prop(). + * + * Returns: true if the property should be ignored for the given inode + * false if the property must not be ignored for the given inode + */ +bool btrfs_ignore_prop(const struct btrfs_inode *inode, const char *name) +{ + const struct prop_handler *handler; + + handler = find_prop_handler(name, NULL); + ASSERT(handler != NULL); + + return handler->ignore(inode); } int btrfs_set_prop(struct btrfs_trans_handle *trans, struct inode *inode, @@ -252,8 +277,12 @@ int btrfs_load_inode_props(struct inode *inode, struct btrfs_path *path) return ret; } -static int prop_compression_validate(const char *value, size_t len) +static int prop_compression_validate(const struct btrfs_inode *inode, + const char *value, size_t len) { + if (!btrfs_inode_can_compress(inode)) + return -EINVAL; + if (!value) return 0; @@ -310,6 +339,22 @@ static int prop_compression_apply(struct inode *inode, const char *value, return 0; } +static bool prop_compression_ignore(const struct btrfs_inode *inode) +{ + /* + * Compression only has effect for regular files, and for directories + * we set it just to propagate it to new files created inside them. + * Everything else (symlinks, devices, sockets, fifos) is pointless as + * it will do nothing, so don't waste metadata space on a compression + * xattr for anything that is neither a file nor a directory. + */ + if (!S_ISREG(inode->vfs_inode.i_mode) && + !S_ISDIR(inode->vfs_inode.i_mode)) + return true; + + return false; +} + static const char *prop_compression_extract(struct inode *inode) { switch (BTRFS_I(inode)->prop_compress) { @@ -330,13 +375,13 @@ static struct prop_handler prop_handlers[] = { .validate = prop_compression_validate, .apply = prop_compression_apply, .extract = prop_compression_extract, + .ignore = prop_compression_ignore, .inheritable = 1 }, }; -static int inherit_props(struct btrfs_trans_handle *trans, - struct inode *inode, - struct inode *parent) +int btrfs_inode_inherit_props(struct btrfs_trans_handle *trans, + struct inode *inode, struct inode *parent) { struct btrfs_root *root = BTRFS_I(inode)->root; struct btrfs_fs_info *fs_info = root->fs_info; @@ -356,6 +401,9 @@ static int inherit_props(struct btrfs_trans_handle *trans, if (!h->inheritable) continue; + if (h->ignore(BTRFS_I(inode))) + continue; + value = h->extract(parent); if (!value) continue; @@ -364,7 +412,7 @@ static int inherit_props(struct btrfs_trans_handle *trans, * This is not strictly necessary as the property should be * valid, but in case it isn't, don't propagate it further. */ - ret = h->validate(value, strlen(value)); + ret = h->validate(BTRFS_I(inode), value, strlen(value)); if (ret) continue; @@ -408,41 +456,6 @@ static int inherit_props(struct btrfs_trans_handle *trans, return 0; } -int btrfs_inode_inherit_props(struct btrfs_trans_handle *trans, - struct inode *inode, - struct inode *dir) -{ - if (!dir) - return 0; - - return inherit_props(trans, inode, dir); -} - -int btrfs_subvol_inherit_props(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - struct btrfs_root *parent_root) -{ - struct super_block *sb = root->fs_info->sb; - struct inode *parent_inode, *child_inode; - int ret; - - parent_inode = btrfs_iget(sb, BTRFS_FIRST_FREE_OBJECTID, parent_root); - if (IS_ERR(parent_inode)) - return PTR_ERR(parent_inode); - - child_inode = btrfs_iget(sb, BTRFS_FIRST_FREE_OBJECTID, root); - if (IS_ERR(child_inode)) { - iput(parent_inode); - return PTR_ERR(child_inode); - } - - ret = inherit_props(trans, child_inode, parent_inode); - iput(child_inode); - iput(parent_inode); - - return ret; -} - void __init btrfs_props_init(void) { int i; |