diff options
Diffstat (limited to 'fs/btrfs/props.c')
-rw-r--r-- | fs/btrfs/props.c | 266 |
1 files changed, 146 insertions, 120 deletions
diff --git a/fs/btrfs/props.c b/fs/btrfs/props.c index 61d22a56c0ba..a9e2e66152ee 100644 --- a/fs/btrfs/props.c +++ b/fs/btrfs/props.c @@ -23,36 +23,6 @@ struct prop_handler { int inheritable; }; -static int prop_compression_validate(const char *value, size_t len); -static int prop_compression_apply(struct inode *inode, - const char *value, - size_t len); -static const char *prop_compression_extract(struct inode *inode); - -static struct prop_handler prop_handlers[] = { - { - .xattr_name = XATTR_BTRFS_PREFIX "compression", - .validate = prop_compression_validate, - .apply = prop_compression_apply, - .extract = prop_compression_extract, - .inheritable = 1 - }, -}; - -void __init btrfs_props_init(void) -{ - int i; - - hash_init(prop_handlers_ht); - - for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) { - struct prop_handler *p = &prop_handlers[i]; - u64 h = btrfs_name_hash(p->xattr_name, strlen(p->xattr_name)); - - hash_add(prop_handlers_ht, &p->node, h); - } -} - static const struct hlist_head *find_prop_handlers_by_hash(const u64 hash) { struct hlist_head *h; @@ -85,15 +55,9 @@ find_prop_handler(const char *name, return NULL; } -static int __btrfs_set_prop(struct btrfs_trans_handle *trans, - struct inode *inode, - const char *name, - const char *value, - size_t value_len, - int flags) +int btrfs_validate_prop(const char *name, const char *value, size_t value_len) { const struct prop_handler *handler; - int ret; if (strlen(name) <= XATTR_BTRFS_PREFIX_LEN) return -EINVAL; @@ -102,9 +66,26 @@ static int __btrfs_set_prop(struct btrfs_trans_handle *trans, if (!handler) return -EINVAL; + if (value_len == 0) + return 0; + + return handler->validate(value, value_len); +} + +int btrfs_set_prop(struct btrfs_trans_handle *trans, struct inode *inode, + const char *name, const char *value, size_t value_len, + int flags) +{ + const struct prop_handler *handler; + int ret; + + handler = find_prop_handler(name, NULL); + if (!handler) + return -EINVAL; + if (value_len == 0) { ret = btrfs_setxattr(trans, inode, handler->xattr_name, - NULL, 0, flags); + NULL, 0, flags); if (ret) return ret; @@ -114,17 +95,14 @@ static int __btrfs_set_prop(struct btrfs_trans_handle *trans, return ret; } - ret = handler->validate(value, value_len); - if (ret) - return ret; - ret = btrfs_setxattr(trans, inode, handler->xattr_name, - value, value_len, flags); + ret = btrfs_setxattr(trans, inode, handler->xattr_name, value, + value_len, flags); if (ret) return ret; ret = handler->apply(inode, value, value_len); if (ret) { - btrfs_setxattr(trans, inode, handler->xattr_name, - NULL, 0, flags); + btrfs_setxattr(trans, inode, handler->xattr_name, NULL, + 0, flags); return ret; } @@ -133,15 +111,6 @@ static int __btrfs_set_prop(struct btrfs_trans_handle *trans, return 0; } -int btrfs_set_prop(struct inode *inode, - const char *name, - const char *value, - size_t value_len, - int flags) -{ - return __btrfs_set_prop(NULL, inode, name, value, value_len, flags); -} - static int iterate_object_props(struct btrfs_root *root, struct btrfs_path *path, u64 objectid, @@ -283,6 +252,78 @@ 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) +{ + if (!value) + return 0; + + if (!strncmp("lzo", value, 3)) + return 0; + else if (!strncmp("zlib", value, 4)) + return 0; + else if (!strncmp("zstd", value, 4)) + return 0; + + return -EINVAL; +} + +static int prop_compression_apply(struct inode *inode, const char *value, + size_t len) +{ + struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); + int type; + + if (len == 0) { + BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; + BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; + BTRFS_I(inode)->prop_compress = BTRFS_COMPRESS_NONE; + + return 0; + } + + if (!strncmp("lzo", value, 3)) { + type = BTRFS_COMPRESS_LZO; + btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); + } else if (!strncmp("zlib", value, 4)) { + type = BTRFS_COMPRESS_ZLIB; + } else if (!strncmp("zstd", value, 4)) { + type = BTRFS_COMPRESS_ZSTD; + btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); + } else { + return -EINVAL; + } + + BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; + BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; + BTRFS_I(inode)->prop_compress = type; + + return 0; +} + +static const char *prop_compression_extract(struct inode *inode) +{ + switch (BTRFS_I(inode)->prop_compress) { + case BTRFS_COMPRESS_ZLIB: + case BTRFS_COMPRESS_LZO: + case BTRFS_COMPRESS_ZSTD: + return btrfs_compress_type2str(BTRFS_I(inode)->prop_compress); + default: + break; + } + + return NULL; +} + +static struct prop_handler prop_handlers[] = { + { + .xattr_name = XATTR_BTRFS_PREFIX "compression", + .validate = prop_compression_validate, + .apply = prop_compression_apply, + .extract = prop_compression_extract, + .inheritable = 1 + }, +}; + static int inherit_props(struct btrfs_trans_handle *trans, struct inode *inode, struct inode *parent) @@ -291,6 +332,7 @@ static int inherit_props(struct btrfs_trans_handle *trans, struct btrfs_fs_info *fs_info = root->fs_info; int ret; int i; + bool need_reserve = false; if (!test_bit(BTRFS_INODE_HAS_PROPS, &BTRFS_I(parent)->runtime_flags)) @@ -308,20 +350,51 @@ static int inherit_props(struct btrfs_trans_handle *trans, if (!value) continue; - num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1); - ret = btrfs_block_rsv_add(root, trans->block_rsv, - num_bytes, BTRFS_RESERVE_NO_FLUSH); + /* + * This is not strictly necessary as the property should be + * valid, but in case it isn't, don't propagate it futher. + */ + ret = h->validate(value, strlen(value)); if (ret) - goto out; - ret = __btrfs_set_prop(trans, inode, h->xattr_name, - value, strlen(value), 0); - btrfs_block_rsv_release(fs_info, trans->block_rsv, num_bytes); - if (ret) - goto out; + continue; + + /* + * Currently callers should be reserving 1 item for properties, + * since we only have 1 property that we currently support. If + * we add more in the future we need to try and reserve more + * space for them. But we should also revisit how we do space + * reservations if we do add more properties in the future. + */ + if (need_reserve) { + num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1); + ret = btrfs_block_rsv_add(root, trans->block_rsv, + num_bytes, BTRFS_RESERVE_NO_FLUSH); + if (ret) + return ret; + } + + ret = btrfs_setxattr(trans, inode, h->xattr_name, value, + strlen(value), 0); + if (!ret) { + ret = h->apply(inode, value, strlen(value)); + if (ret) + btrfs_setxattr(trans, inode, h->xattr_name, + NULL, 0, 0); + else + set_bit(BTRFS_INODE_HAS_PROPS, + &BTRFS_I(inode)->runtime_flags); + } + + if (need_reserve) { + btrfs_block_rsv_release(fs_info, trans->block_rsv, + num_bytes); + if (ret) + return ret; + } + need_reserve = true; } - ret = 0; -out: - return ret; + + return 0; } int btrfs_inode_inherit_props(struct btrfs_trans_handle *trans, @@ -364,64 +437,17 @@ int btrfs_subvol_inherit_props(struct btrfs_trans_handle *trans, return ret; } -static int prop_compression_validate(const char *value, size_t len) -{ - if (!strncmp("lzo", value, 3)) - return 0; - else if (!strncmp("zlib", value, 4)) - return 0; - else if (!strncmp("zstd", value, 4)) - return 0; - - return -EINVAL; -} - -static int prop_compression_apply(struct inode *inode, - const char *value, - size_t len) +void __init btrfs_props_init(void) { - struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); - int type; - - if (len == 0) { - BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; - BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; - BTRFS_I(inode)->prop_compress = BTRFS_COMPRESS_NONE; - - return 0; - } - - if (!strncmp("lzo", value, 3)) { - type = BTRFS_COMPRESS_LZO; - btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); - } else if (!strncmp("zlib", value, 4)) { - type = BTRFS_COMPRESS_ZLIB; - } else if (!strncmp("zstd", value, 4)) { - type = BTRFS_COMPRESS_ZSTD; - btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); - } else { - return -EINVAL; - } + int i; - BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; - BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; - BTRFS_I(inode)->prop_compress = type; + hash_init(prop_handlers_ht); - return 0; -} + for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) { + struct prop_handler *p = &prop_handlers[i]; + u64 h = btrfs_name_hash(p->xattr_name, strlen(p->xattr_name)); -static const char *prop_compression_extract(struct inode *inode) -{ - switch (BTRFS_I(inode)->prop_compress) { - case BTRFS_COMPRESS_ZLIB: - case BTRFS_COMPRESS_LZO: - case BTRFS_COMPRESS_ZSTD: - return btrfs_compress_type2str(BTRFS_I(inode)->prop_compress); - default: - break; + hash_add(prop_handlers_ht, &p->node, h); } - - return NULL; } - |